Статті в журналах: "Room Temperature CO2 Adsorption"

1

Zhou, Neng, Zhen Zhou, Yuan Qin, and Chu Jie Zeng. "Study on the Removal of Heavy Metals by Biomass." Advanced Materials Research 634-638 (January 2013): 276–79. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.276.

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In this paper, the adsorption of heavy metals by biomass, namely dry garlic stem, an environmentally-friendly and natural adsorbent, were studied．The efficiency of the adsorbent was studied under different experimental conditions by varying parameters such as pH, initial concentration and contact time using batch adsorption technique. The results show that at pH 5.50, room temperature, the adsorption time 90 min and the amount of garlic stem 0.5 g, Co2+ have the maximum adsorption capacity. The maximum adsorption capacity of the Co2+ on garlic stem is 14.9 mg/g. At pH 9.50, the adsorption time 90 min and the amount of garlic stem 0.7g, Cd2+ have the maximum adsorption at the same temperature. The maximum adsorption of the Cd2+ is 20.90 mg/g. At pH 10.0, the adsorption time 150 min and the amount of garlic stem 0.3g, Ni2+ have the maximum adsorption at the same temperature. The dry garlic stem is a efficient adsorbent in removing cobalt, cadmium and nickel from aqueous solution.

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2

Senevirathna, Hasanthi L., P. Vishakha T. Weerasinghe, Xu Li, Ming-Yan Tan, Sang-Sub Kim, and Ping Wu. "Counter-Intuitive Magneto-Water-Wetting Effect to CO2 Adsorption at Room Temperature Using MgO/Mg(OH)2 Nanocomposites." Materials 15, no. 3 (January 27, 2022): 983. http://dx.doi.org/10.3390/ma15030983.

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MgO/Mg(OH)2-based materials have been intensively explored for CO2 adsorption due to their high theoretical but low practical CO2 capture efficiency. Our previous study on the effect of H2O wetting on CO2 adsorption in MgO/Mg(OH)2 nanostructures found that the presence of H2O molecules significantly increases (decreases) CO2 adsorption on the MgO (Mg(OH)2) surface. Furthermore, the magneto-water-wetting technique is used to improve the CO2 capture efficiency of various nanofluids by increasing the mass transfer efficiency of nanobeads. However, the influence of magneto-wetting to the CO2 adsorption at nanobead surfaces remains unknown. The effect of magneto-water-wetting on CO2 adsorption on MgO/Mg(OH)2 nanocomposites was investigated experimentally in this study. Contrary to popular belief, magneto-water-wetting does not always increase CO2 adsorption; in fact, if Mg(OH)2 dominates in the nanocomposite, it can actually decrease CO2 adsorption. As a result of our structural research, we hypothesized that the creation of a thin H2O layer between nanograins prevents CO2 from flowing through, hence slowing down CO2 adsorption during the carbon-hydration aging process. Finally, the magneto-water-wetting technique can be used to control the carbon-hydration process and uncover both novel insights and discoveries of CO2 capture from air at room temperature to guide the design and development of ferrofluid devices for biomedical and energy applications.

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3

Kang, Misun, Jong-tak Lee, Min-Kyoung Kim, Myunghwan Byun, and Jae-Young Bae. "Facile Synthesis of Mesoporous Silica at Room Temperature for CO2 Adsorption." Micromachines 13, no. 6 (June 10, 2022): 926. http://dx.doi.org/10.3390/mi13060926.

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Although mesoporous silica materials have been widely investigated for many applications, most silica materials are made by calcination processes. We successfully developed a convenient method to synthesize mesoporous materials at room temperature. Although the silica materials made by the two different methods, which are the calcination process and the room-temperature process, have similar specific surface areas, the silica materials produced with the room-temperature process have a significantly larger pore volume. This larger pore volume has the potential to attach to functional groups that can be applied to various industrial fields such as CO2 adsorption. This mesoporous silica with a larger pore volume was analyzed by TEM, FT-IR, low angle X-ray diffraction, N2-adsorption analysis, and CO2 adsorption experiments in comparison with the mesoporous silica synthesized with the traditional calcination method.

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4

Cho, Kyungil, Yeryeong Kang, Sukbyung Chae, and Changhyuk Kim. "Forced Mineral Carbonation of MgO Nanoparticles Synthesized by Aerosol Methods at Room Temperature." Nanomaterials 13, no. 2 (January 9, 2023): 281. http://dx.doi.org/10.3390/nano13020281.

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Magnesium oxide (MgO) has been investigated as a wet mineral carbonation adsorbent due to its relatively low adsorption and regeneration temperatures. The carbon dioxide (CO2) capture efficiency can be enhanced by applying external force on the MgO slurry during wet carbonation. In this study, two aerosol-processed MgO nanoparticles were tested with a commercial MgO one to investigate the external force effect on the wet carbonation performance at room temperature. The MgO nano-adsorbents were carbonated and sampled every 2 h up to 12 h through forced and non-forced wet carbonations. Hydrated magnesium carbonates (nesquehonite, artinite and hydromagnesite) were formed with magnesite through both wet carbonations. The analyzed results for the time-dependent chemical compositions and physical shapes of the carbonation products consistently showed the enhancement of wet carbonation by the external force, which was at least 4 h faster than the non-forced carbonation. In addition, the CO2 adsorption was enhanced by the forced carbonation, resulting in a higher amount of CO2 being adsorbed by MgO nanoparticles than the non-forced carbonation, unless the carbonation processes were completed. The adsorbed amount of CO2 was between the maximum theoretical amounts of CO2 adsorbed by nesquehonite and hydromagnesite.

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5

Sharma, Vivekanand, Dinesh De, Ranajit Saha, Ranjita Das, Pratim Kumar Chattaraj, and Parimal K. Bharadwaj. "A Cu(ii)-MOF capable of fixing CO2 from air and showing high capacity H2 and CO2 adsorption." Chemical Communications 53, no. 100 (2017): 13371–74. http://dx.doi.org/10.1039/c7cc08315g.

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6

Gao, Yangfeng, Chao Dong, Fan Zhang, Hongwei Ma, and Yang Li. "Constructing Polyimide Aerogels with Carboxyl for CO2 Adsorption." Polymers 14, no. 3 (January 18, 2022): 359. http://dx.doi.org/10.3390/polym14030359.

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In this study, mesoporous polyimide aerogels with carboxyl were successfully synthesized by the co-polymerization method at room temperature from pyromellitic dianhydride and 1,3,5-triaminophenoxybenzene, 3,5-diaminobenzoic acid, and 2,2′-dimethyl-4,4′-diaminobiphenyl. Compared to previously reported porous organic polymer materials, this aerogel has the advantage of a simple and efficient synthesis method. The thermal decomposition temperatures of the obtained polyimide aerogels are all above 400 °C and have excellent thermal stability. Among them, the largest specific surface area is 62.03 m2/g. Although the surface area of this aerogel is not large enough, it has considerable CO2 adsorption properties. The adsorption capacity of CO2 is up to 11.9 cm3/g, which is comparable to those of previously reported porous materials. The high CO2 adsorption is attributed to the abundance of carboxyl groups in the polyimide networks. The mild and convenient synthesis method and high CO2 adsorption capacity indicate that the polyimide aerogel with carboxyl is suitable as a good candidate material for CO2 adsorption.

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7

Marliza, Tengku Sharifah, Mohd Ambar Yarmo, Azizul Hakim, Maratun Najiha Abu Tahari, and Yun Hin Taufiq-Yap. "Characterizations and Application of Supported Ionic Liquid [bmim][CF₃SO₃]/SiO₂ in CO₂ Capture." Materials Science Forum 888 (March 2017): 485–90. http://dx.doi.org/10.4028/www.scientific.net/msf.888.485.

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Supported ionic liquid (IL) [bmim][CF3SO3] on SiO2 was prepared, characterized and its potential evaluated for CO2 capture via adsorption and desorption studies using gas adsorption analyzer. The physical and chemical properties were determined using N2 adsorption/desorption and CO2-TPD analysis. The increasing IL loading caused a drastic decrease in the surface area as well as pore volume due to the confinement of IL within the micropore and mesopore area. However, the increasing IL loading increased the basicity of the sorbent which significantly enhanced CO2 chemisorption. Supported [bmim][CF3SO3] on SiO2 revealed the physical and chemical adsorption of CO2 and resulted in a remarkable CO2 adsorption capacity at atmospheric pressure and room temperature (66.7 mg CO2/gadsorbent) which has great potential in industrial applications.

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8

Silvestre-Albero, Joaquín, Anass Wahby, Antonio Sepúlveda-Escribano, Manuel Martínez-Escandell, Katsumi Kaneko, and Francisco Rodríguez-Reinoso. "Ultrahigh CO2 adsorption capacity on carbon molecular sieves at room temperature." Chemical Communications 47, no. 24 (2011): 6840. http://dx.doi.org/10.1039/c1cc11618e.

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9

Liu, Zhong-Yi, Hong Zhao, Wei-Chao Song, Xiu-Guang Wang, Zheng-Yu Liu, Xiao-Jun Zhao, and En-Cui Yang. "A dynamic microporous magnet exhibiting room-temperature thermal hysteresis, variable magnetic ordering temperatures and highly selective adsorption for CO2." Journal of Materials Chemistry C 7, no. 2 (2019): 218–22. http://dx.doi.org/10.1039/c8tc03356k.

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10

Zhang, Hua Li, Chun Jie Yan, Xu Jian Li, Hong Quan Wang, and Sen Zhou. "Study on CO₂ Adsorption of Sepoilite Modified by Mixture of Ethanolamine and N, N-Dimethyl Ethanolamine." Advanced Materials Research 454 (January 2012): 82–88. http://dx.doi.org/10.4028/www.scientific.net/amr.454.82.

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Sepoilite was surface-modified by the mixture of ethanolamine and n, n-dimethyl ethanolamine. The XRD, SEM, FT-IR, BET and TGA were used to characterize the material structure and the adsorption property in CO2. The results showed that the weight percentage of CO2 adsorption rose from 4.01% for pure sepoilite to 19.28% for the modified sepoilite at room temperature.

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11

Xu, Feng, Ying Yu, Jian Yan, Qibin Xia, Haihui Wang, Jing Li, and Zhong Li. "Ultrafast room temperature synthesis of GrO@HKUST-1 composites with high CO2 adsorption capacity and CO2/N2 adsorption selectivity." Chemical Engineering Journal 303 (November 2016): 231–37. http://dx.doi.org/10.1016/j.cej.2016.05.143.

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12

Ramos-Fernandez, E. V., A. Grau-Atienza, D. Farrusseng, and S. Aguado. "A water-based room temperature synthesis of ZIF-93 for CO2 adsorption." Journal of Materials Chemistry A 6, no. 14 (2018): 5598–602. http://dx.doi.org/10.1039/c7ta09807c.

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13

Solis, Brian H., Yi Cui, Xuefei Weng, Jan Seifert, Swetlana Schauermann, Joachim Sauer, Shamil Shaikhutdinov, and Hans-Joachim Freund. "Initial stages of CO2 adsorption on CaO: a combined experimental and computational study." Physical Chemistry Chemical Physics 19, no. 6 (2017): 4231–42. http://dx.doi.org/10.1039/c6cp08504k.

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Room temperature adsorption of carbon dioxide (CO₂) on monocrystalline CaO(001) thin films grown on a Mo(001) substrate was studied by infrared reflection–absorption spectroscopy (IRAS) and quantum chemical calculations.

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14

Wan Isahak, Wan Nor Roslam, Zatil Amali Che Ramli, Azizul Hakim Lahuri, Muhammad Rahimi Yusop, Mohamed Wahab Mohamed Hisham, and Mohd Ambar Yarmo. "Enhancement of CO₂ Capture Using CuO Nanoparticles Supported on Green Activated Carbon." Advanced Materials Research 1087 (February 2015): 111–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.111.

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At room temperature, dehydrating agent, concentrated sulfuric acid (H2SO4) was used to form porous carbon (BAC) from bamboo waste shows good properties as CO2 adsorbent. Selection of nano-CuO supported BAC produce composite materials with high total surface area and smaller pores size composite of 660.8 cm2/g and 2.7 nm. XRD data showed the support data to confirm the hydroxide phase formation as intermediate for carbonate and accelerate the CO2 chemisorption reaction. Besides, the presence of BAC together with metal oxide can improve the CO2 interaction physically on the surface and pores resulting the higher adsorption capability of 32.2 cm3 of CO2 per gram adsorbent. The combination of nano-CuO on BAC become a good adsorbent which can stimulate the CO2 reduction programme as well as reduce the CO2 emissions during BAC production.

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15

Zhao, Yongting, and Yiming Xie. "High CO2 Adsorption Enthalpy Enabled by Uncoordinated N-Heteroatom Sites of a 3D Metal-Organic Framework." Journal of Chemistry 2019 (December 21, 2019): 1–5. http://dx.doi.org/10.1155/2019/4712807.

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A 3D metal-organic framework (MOF), Mn2L2(H2O)2 · (DMF) {H2L = 5- (Pyridin-2-yl)-3, 3′-bi (1H-1,2,4-triazole)} (1) with uncoordinated N-heteroatom sites, has been obtained through hydrothermal method and structurally characterized by X-ray structural analysis, powder X-ray diffraction (PXRD), and thermal analysis (TGA). The framework of compound 1 exhibits fascinating adsorption properties and shows high adsorption enthalpy of CO2. The experimental results prove which uncoordinated nitrogen heteroatom sites can markedly increase the reciprocity between host frame and CO2 at room temperature.

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16

Sun, Jian, Manoharan Muruganathan, and Hiroshi Mizuta. "Room temperature detection of individual molecular physisorption using suspended bilayer graphene." Science Advances 2, no. 4 (April 2016): e1501518. http://dx.doi.org/10.1126/sciadv.1501518.

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Detection of individual molecular adsorption, which represents the ultimate resolution of gas sensing, has rarely been realized with solid-state devices. So far, only a few studies have reported detection of individual adsorption by measuring the variation of electronic transport stemming from the charge transfer of adsorbate. We report room-temperature detection of the individual physisorption of carbon dioxide molecules with suspended bilayer graphene (BLG) based on a different mechanism. An electric field introduced by applying back-gate voltage is used to effectively enhance the adsorption rate. A unique device architecture is designed to induce tensile strain in the BLG to prevent its mechanical deflection onto the substrate by electrostatic force. Despite the negligible charge transfer from a single physisorbed molecule, it strongly affects the electronic transport in suspended BLG by inducing charged impurity, which can shut down part of the conduction of the BLG with Coulomb impurity scattering. Accordingly, we can detect each individual physisorption as a step-like resistance change with a quantized value in the BLG. We use density functional theory simulation to theoretically estimate the possible resistance response caused by Coulomb scattering of one adsorbed CO2 molecule, which is in agreement with our measurement.

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17

Baimuratova, Rose K., N. D. Golubeva, Gulzhian I. Dzhardimalieva, G. I. Davydova, and E. I. Knerelman. "Metal-Organic Coordination Polymers Based on Copper: Synthesis, Structure and Adsorption Properties." Key Engineering Materials 816 (August 2019): 108–13. http://dx.doi.org/10.4028/www.scientific.net/kem.816.108.

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Metal-organic frameworks (MOFs) are promising materials for a number of applications including gas storage and separation. In this work, coordination polymers based on copper and trimesic acid were prepared and characterized by physicochemical methods. Three different synthesis strategies were employed: precipitation at room temperature, hydrothermal method (at different temperatures) and using CO2 as SAS technique (Supercritical AntiSolvent). The obtaining samples was also tested on its capacity in CH4 adsorption at 1 bar and 296 К and 233K.

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18

Raaen, Steinar. "Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100)." Nanomaterials 11, no. 8 (August 14, 2021): 2064. http://dx.doi.org/10.3390/nano11082064.

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Studies of adsorption of CO2 on nanoscopic surfaces are relevant for technological applications in heterogeneous catalysis as well as for sorption of this important greenhouse gas. Presently, adsorption of carbon dioxide on pure and oxidized thin samarium layers near mono-layer thickness on Ni(100) has been investigated by photoelectron spectroscopy and temperature programmed desorption. It is observed that very little CO2 adsorb on the metallic sample for exposures in the vacuum regime at room temperature. For the oxidized sample, a large enhancement in CO2 adsorption is observed in the desorption measurements. Indications of carbonate formation on the surface were found by C 1s and O 1s XPS. After annealing of the oxidized samples to 900 K very little CO2 was found to adsorb. Differences in desorption spectra before and after annealing of the oxidized samples are correlated with changes in XPS intensities, and with changes in sample work function which determines the energy difference between molecular orbitals and substrate Fermi level, and thus the probability of charge transfer between adsorbed molecule and substrate.

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19

Kalwar, Basheer Ahmed, Wang Fangzong, Amir Mahmood Soomro, Muhammad Rafique Naich, Muhammad Hammad Saeed, and Irfan Ahmed. "Highly sensitive work function type room temperature gas sensor based on Ti doped hBN monolayer for sensing CO₂, CO, H₂S, HF and NO. A DFT study." RSC Advances 12, no. 53 (2022): 34185–99. http://dx.doi.org/10.1039/d2ra06307g.

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The adsorptions of toxic gas molecules (CO2, CO, H2S, HF and NO) on pristine and Ti atom doped hexagonal boron nitride (hBN) monolayer are investigated by density functional theory. Ti atom doping significantly enhances the adsorption ability.

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20

Hakim, Azizul, Wan Nor Roslam Wan Isahak, Maratun Najiha Abu Tahari, Muhammad Rahimi Yusop, Mohamed Wahab Mohamed Hisham, and Mohd Ambar Yarmo. "Temperature Programmed Desorption of Carbon Dioxide for Activated Carbon Supported Nickel Oxide: The Adsorption and Desorption Studies." Advanced Materials Research 1087 (February 2015): 45–49. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.45.

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The priority of success in practical CO2 capture with solid sorbents is dependent on the development of a low cost sorbent and energy consumption for regeneration with high adsorption capacity. In this work, different loading of NiO were evaluated as a potential source of basic sites for CO2 capture, and activated carbon (AC) was used as a preliminary support in order to study the effect of the impregnation. The NiO loading increased the basicity of the adsorbent significantly enhance the CO2 chemisorption. Nonetheless, it drastically reduced the surface area of the AC, which is chiefly responsible for CO2 physisorption, thus decreasing the carrying capacity of ACs at room temperature and pressure.

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21

Ciobanu, Marina, and Dumitru Tsiulyanu. "Effect of aging, temperature, and ambient gases on the complex impedance of As2Te13Ge8S3 glassy films." Moldavian Journal of the Physical Sciences 20, no. 2 (January 2022): 151–62. http://dx.doi.org/10.53081/mjps.2021.20-2.06.

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The work is focused on the application of the impedance spectroscopy method to provide evidence and study the effects of aging, temperature, and gas adsorption in chalcogenide-based thin films. The experiments are carried out with thin films of glassy quaternary composition As2Te13Ge8S3 in a wide frequency range at different temperatures under different environmental conditions, in particular, either dry or wet air or their mixtures with NO2 or CO2. It is found that aging has a significant effect on the impedance spectra of Pt–As2Te13Ge8S3–Pt functional structures, which make evidence for the presence of substantial spatial and compositional disordering. This effect can be stabilized by the post-preparation annealing of the sample. The effect of temperature on impedance spectra consists in a variation in the both real and imaginary parts of impedance that appear to be extremely sensitive to adsorptive processes. Adsorption of nitrogen dioxide results in a significant frequency-dependent decrease in the impedance parameters, which is attributed to an effective “strong” chemisorption process due to the interaction of "odd" electrons of NO2 molecules with lone pair electrons of chalcogen atoms. The effect of water vapors leads only to an increase in the real part of impedance, while the imaginary part abruptly decreases; this fact is attributed to a “weak” form of chemisorption. The effect of carbon dioxide on the impedance spectra is attributed to the physical adsorption of CO2 molecules. This effect is weak; however, it is reversible and clearly observed even at room temperature.

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22

Zhumagaliyeva, А., V. Gargiulo, F. Raganat, Ye Doszhanov, and M. Alfe. "Carbon based nanocomposite material for CO2 capture technology." Горение и Плазмохимия 17, no. 1 (June 5, 2019): 9–13. http://dx.doi.org/10.18321/cpc283.

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Carbon capture and sequestration contains a group of technologies keeping thedifferentiation of CO2 from large industrial and energy related sources, transport toa storage location and long-term isolation from the atmosphere. Previous studiesof CO2 adsorption on low-cost iron metal oxide surfaces strongly encourage thepossible use of metal oxide as sorbents, but the tendency of magnetite particles toagglomerate causes a lowering of CO2 sorption capacity. This work investigates theadsorption behavior of CO2 on composite materials prepared coating a low-costcarbonized rice husk (cRH), commercial carbon black (CB) with magnetite fineparticles. The CO2 capture capacity of composites and based on rice husk materialswas evaluated the basis of the breakthrough times measured at atmosphericpressure and room temperature in a lab-scale fixed bed micro-reactor. To thisaim the reactor has been firstly operated for CO2 adsorption data with obtainedsamples.

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23

Muchan, Pailin, Chintana Saiwan, and Manit Nithitanakul. "Investigation of adsorption/desorption performance by aminopropyltriethoxysilane grafted onto different mesoporous silica for post-combustion CO2 capture." Clean Energy 4, no. 2 (April 1, 2020): 120–31. http://dx.doi.org/10.1093/ce/zkaa003.

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Abstract Mesoporous silicas with hexagonal structure (MCM-41 and SBA-15) and cubical interconnected pore structure (KIT-6) were synthesized and modified with aminopropyltriethoxysilane (APTES) for using as adsorbents in carbon-dioxide (CO2)-adsorption application. The CO2-adsorption experiment was carried out at room temperature and atmospheric pressure using 15% CO2 with a flow rate of 20 mL/min and the desorption experiment was carried out at 100°C under N2 balance with a flow rate of 20 mL/min. The adsorption capacity and adsorption rate of all modified mesoporous silicas were enhanced due to the presence of primary amine in the structure, which was able to form a fast chemical reaction with CO2. All adsorbents showed good adsorption performance stability after using over five adsorption/desorption cycles. Due to the effect of the adsorbents’ porous structure on the adsorption/desorption process, an adsorbent with sufficient pore-size diameter and pore volume together with interconnected pore, KIT-6, represents a promising adsorbent that gave the optimum adsorption/desorption performance among others. It showed reasonable adsorption capacity with a high rate of adsorption. In addition, it could also be regenerated with 99.72% efficiency using 12.07 kJ/mmolCO2 of heat duty for regeneration.

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24

Liu, Peng-Fei, Kai Tao, Guo-Chang Li, Meng-Ke Wu, Shuai-Ru Zhu, Fei-Yan Yi, Wen-Na Zhao, and Lei Han. "In situ growth of ZIF-8 nanocrystals on layered double hydroxide nanosheets for enhanced CO2 capture." Dalton Transactions 45, no. 32 (2016): 12632–35. http://dx.doi.org/10.1039/c6dt02083f.

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A hexagonal nanosheet LDH@ZIF-8 composite was fabricated by in situ growth of ZIF-8 on Zn–Al LDH and exhibited a CO₂ adsorption capacity of 1.0 mmol g⁻¹ at room temperature and 1 bar.

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25

Woo, Tae Gyun, Byeong Jun Cha, Young Dok Kim, and Hyun Ook Seo. "Positive Effects of Impregnation of Fe-oxide in Mesoporous Al-Oxides on the Decontamination of Dimethyl Methylphosphonate." Catalysts 9, no. 11 (October 28, 2019): 898. http://dx.doi.org/10.3390/catal9110898.

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Dimethyl methylphosphonate (DMMP) is an important simulant of organophosphates pesticides and chemical warfare nerve agents. Here, we investigated the catalytic decontamination of DMMP on Fe-oxide impregnated mesoporous Al2O3. Fe-oxide/Al2O3 sample was prepared via the temperature regulated chemical vapor deposition of Fe-oxide on mesoporous Al2O3 and post-annealing at 750 °C. The Fe-oxide/Al2O3 and bare Al2O3 samples were exposed to DMMP-containing dry air at room temperature to study the effects of Fe-oxide impregnation on the reactive adsorption of DMMP. The facilitation of DMMP degradation into CO2 and methanol at room temperature in the presence of nano-dispersed Fe-oxide was evidenced by gas-chromatograph and Fourier transform-infrared (FT-IR) absorption spectroscopy. In addition, temperature programmed oxidation (TPO) experiments and gas chromatography (Agilent, 6890) equipped with mass spectrometer (Agilent, 5973N) (GC/MS) analyses revealed that the minimum temperature that was required for total oxidation of DMMP into CO2 can also be lowered by Fe-oxide impregnation in mesoporous Al2O3.

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26

Manokeaw, Sattaya, Thatsaneeya Nim-Anutsonkun, Takdanai Chaiya, Warut Timprae, and Damrongsak Rinchumphu. "Assessment of CO2 Reduction Potential of Indoor Plants Using Artificial Neural Network in Classrooms." Journal of Hunan University Natural Sciences 49, no. 5 (May 30, 2022): 33–40. http://dx.doi.org/10.55463/issn.1674-2974.49.5.4.

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Carbon dioxide gas (CO2) is one of the critical factors used to measure indoor air quality that affects the well-being of school building occupants daily. Therefore, efforts to reduce the indoor-CO2 amounts have been made by adding indoor plants to absorb the CO2. The critical knowledge is to understand the factors affecting the rate of CO2 adsorption. This research aims to study the relationship between indoor CO2 reduction using trees and environments. First, a flowerpot with snake plants is placed in a room of 24.5 m2 for the data collection of the temperature, the relative humidity, light intensity, and the amount of CO2 using sensors. Then, the data were used to create a forecast model using the Artificial Neural Network (ANN) technique, which its accuracy was 99.64%. The results showed that the snake plants could reduce 2.13% of the indoor CO2. The suitable environment for plant photosynthesis is a temperature of 25 to 30°C and relative humidity of 40% at a light intensity of 200 Lux. The results can be used as data in the design of rooms in educational institutions to effectively increase the air quality in response to building occupants' health.

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27

Kunkel, Christian, Francesc Viñes, and Francesc Illas. "Transition metal carbides as novel materials for CO2 capture, storage, and activation." Energy & Environmental Science 9, no. 1 (2016): 141–44. http://dx.doi.org/10.1039/c5ee03649f.

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Transition metal carbides are posed as promising materials for carbon dioxide (CO₂) capture and storage at room temperature and low pressures, as shown by density functional simulations on proper models, and estimates of adsorption/desorption rates. Aside, the activated nature of the adsorbed CO₂ opens the path for its conversion into other valuable chemicals.

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28

Candamano, S., A. Policicchio, A. Macario, G. Conte, R. G. Agostino, P. Frontera, and F. Crea. "CO2 Adsorption Investigation on an Innovative Nanocomposite Material with Hierarchical Porosity." Journal of Nanoscience and Nanotechnology 19, no. 6 (June 1, 2019): 3223–31. http://dx.doi.org/10.1166/jnn.2019.16650.

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A NaX nanozeolite-geopolymer monolith, with hierarchical porosity, has been produced by a one-pot hydrothermal synthesis using metakaolin as alluminosilicate source and a sodium silicate solution as activator. Its final composition, reported in terms of oxides, is 1.3–Na2O–3.0SiO2–1Al2O3–12H2O. Its microstructural and chemical features and CO2 adsorption performance have been investigated. The microstructure of the composite is characterized by NaX zeolite nanocrystals glued by the geopolymeric binder to form a complex three-dimensional network of pores. Overall porosity resulted ~23.5%, whereas compressive strength is 16±0.7 MPa. Monolith showed BET surface area of 350 m2/g, a micropore surface area of 280 m2/g and a mesopore volume, due to the geopolymeric binder, of 0.09 cm3/g. Its CO2 adsorption capacity has been measured at the temperatures of 7, 25 and 42 °C up to 15 bar using an optimized Sievert-type (volumetric) apparatus. All the adsorption data were evaluated by Toth/Langmuir isotherm model and commercial pure NaX zeolite was used as reference. CO2 adsorption isotherms show a maximum uptake value around 21 wt% at (~7 °C) that decrease to 18 wt% at high temperature (~42 °C) passing through 19 wt% at room temperature (~25 °C). The homogeneity grade of the surface, as obtained using Toth analysis performed on the adsorption isotherm, is close to t ≅ 0.40, lower than the 0.61 obtained for pure commercial NaX zeolite, as a consequence of the binder formation. Monolith exhibits a notably higher K values and quicker saturation with respect to reference that can be ascribed to the presence of mesoporosity that provides an easier and faster transport of CO2 in the NaX nanozeolite framework. The produced composite is a potential solid adsorbent candidate in industrial process.

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29

Liu, Min-Min, Yan-Lin Bi, Qin-Qin Dang, and Xian-Ming Zhang. "Reversible single-crystal-to-single-crystal transformation from a mononuclear complex to a fourfold interpenetrated MOF with selective adsorption of CO2." Dalton Transactions 44, no. 46 (2015): 19796–99. http://dx.doi.org/10.1039/c5dt03570h.

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Анотація:

Reversible crystal transformation was observed between a mononuclear complex to a fourfold interpenetrated MOF with selective adsorption of CO₂ up to 12.5 wt% at room temperature and low pressure.

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30

Samanta, Partha, Priyanshu Chandra, and Sujit K. Ghosh. "Hydroxy-functionalized hyper-cross-linked ultra-microporous organic polymers for selective CO2 capture at room temperature." Beilstein Journal of Organic Chemistry 12 (September 2, 2016): 1981–86. http://dx.doi.org/10.3762/bjoc.12.185.

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Анотація:

Two hydroxy-functionalized hyper-cross-linked ultra-microporous compounds have been synthesized by Friedel–Crafts alkylation reaction and characterised with different spectroscopic techniques. Both compounds exhibit an efficient carbon dioxide uptake over other gases like N2, H2 and O2 at room temperature. A high isosteric heat of adsorption (Q st) has been obtained for both materials because of strong interactions between polar –OH groups and CO2 molecules.

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31

Ling, Yajing, Chengling Song, Yunlong Feng, Mingxing Zhang, and Yabing He. "A metal–organic framework based on cyclotriphosphazene-functionalized hexacarboxylate for selective adsorption of CO2 and C2H6 over CH4 at room temperature." CrystEngComm 17, no. 33 (2015): 6314–19. http://dx.doi.org/10.1039/c5ce00930h.

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Анотація:

A new MOF constructed from a flexible cyclotriphosphazene-functionalized hexacarboxylate exhibits selective adsorption of CO₂ and C₂H₆ over CH₄ at room temperature.

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32

Zhao, Xuemei, Yihui Yuan, Peipei Li, Zenjun Song, Chunxin Ma, Duo Pan, Shide Wu, Tao Ding, Zhanhu Guo, and Ning Wang. "A polyether amine modified metal organic framework enhanced the CO2 adsorption capacity of room temperature porous liquids." Chemical Communications 55, no. 87 (2019): 13179–82. http://dx.doi.org/10.1039/c9cc07243h.

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33

Dubskikh, Vadim A., Anna A. Lysova, Denis G. Samsonenko, Alexander N. Lavrov, Konstantin A. Kovalenko, Danil N. Dybtsev, and Vladimir P. Fedin. "3D Metal–Organic Frameworks Based on Co(II) and Bithiophendicarboxylate: Synthesis, Crystal Structures, Gas Adsorption, and Magnetic Properties." Molecules 26, no. 5 (February 26, 2021): 1269. http://dx.doi.org/10.3390/molecules26051269.

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Three new 3D metal-organic porous frameworks based on Co(II) and 2,2′-bithiophen-5,5′-dicarboxylate (btdc2−) [Co3(btdc)3(bpy)2]·4DMF, 1; [Co3(btdc)3(pz)(dmf)2]·4DMF·1.5H2O, 2; [Co3(btdc)3(dmf)4]∙2DMF∙2H2O, 3 (bpy = 2,2′-bipyridyl, pz = pyrazine, dmf = N,N-dimethylformamide) were synthesized and structurally characterized. All compounds share the same trinuclear carboxylate building units {Co3(RCOO)6}, connected either by btdc2– ligands (1, 3) or by both btdc2– and pz bridging ligands (2). The permanent porosity of 1 was confirmed by N2, O2, CO, CO2, CH4 adsorption measurements at various temperatures (77 K, 273 K, 298 K), resulted in BET surface area 667 m2⋅g−1 and promising gas separation performance with selectivity factors up to 35.7 for CO2/N2, 45.4 for CO2/O2, 20.8 for CO2/CO, and 4.8 for CO2/CH4. The molar magnetic susceptibilities χp(T) were measured for 1 and 2 in the temperature range 1.77–330 K at magnetic fields up to 10 kOe. The room-temperature values of the effective magnetic moments for compounds 1 and 2 are μeff (300 K) ≈ 4.93 μB. The obtained results confirm the mainly paramagnetic nature of both compounds with some antiferromagnetic interactions at low-temperatures T < 20 K in 2 between the Co(II) cations separated by short pz linkers. Similar conclusions were also derived from the field-depending magnetization data of 1 and 2.

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34

Wu, Wei-Ping, Zhi-Sen Li, Bo Liu, Ping Liu, Zheng-Ping Xi, and Yao-Yu Wang. "Double-step CO2 sorption and guest-induced single-crystal-to-single-crystal transformation in a flexible porous framework." Dalton Transactions 44, no. 22 (2015): 10141–45. http://dx.doi.org/10.1039/c5dt00460h.

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Анотація:

A new 2D highly flexible and breathing porous coordination polymer has been synthesized, which exhibits selective and double-step hysteretic adsorption for CO₂, and shows a single-crystal-to-single-crystal transformation induced by CH₂Cl₂ at room temperature.

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35

Ai, Jiajia, Fu Li, Yu Wu, Yukun Yin, Zhaojun Wu, and Jianbin Zhang. "Synthesis of mesoporous magnesium silicate from coal gangue for efficient CO2 adsorption at room temperature." Fuel 341 (June 2023): 127692. http://dx.doi.org/10.1016/j.fuel.2023.127692.

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36

Zhang, Xiaoping, Wenjie Chen, Wei Shi, and Peng Cheng. "Highly selective sorption of CO2 and N2O and strong gas-framework interactions in a nickel(ii) organic material." Journal of Materials Chemistry A 4, no. 41 (2016): 16198–204. http://dx.doi.org/10.1039/c6ta06572d.

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Анотація:

A new robust microporous Ni MOF shows excellent greenhouse gas adsorption capabilities as well as high separations of CO₂ and N₂O over N₂/O₂/CH₄/H₂/Ar/He at room temperature.

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37

CHALAL, Nabila, Hadj HAMAIZI, and Maria Del Mar SOCIAS VICIANA. "Thermodynamic Study of Light Organic Molecules Adsorption onto ZK-4 Zeolite." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 7 (October 22, 2014): 2921–28. http://dx.doi.org/10.24297/jac.v10i7.6800.

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Анотація:

In this work, we were interested to the interactions of various light gases (critical temperature not exceeding 31 °C) with the zeolite ZK-4 and its varieties exchanged at temperatures close to ambient. The interest first practice since these gases are frequently encountered in industry, and most separations, that concern them by pressure swing adsorption (PSA) are carried at room temperature. By working in these conditions, we will be in the scope of application of Henry's law, which will allow us to better characterize the adsorption of the first molecules (gas-solid interaction). The thermodynamic study should enable us to identify the type of adsorption (localized, non-localized) by applying a theoretical model explaining the experimental results. The choice of the adsorbate was guided by the behavior of the introduced molecules toward the compensating cations present in the zeolite framework. These probe molecules having a specific interaction with zeolitic cations: N2, CO2 (highly quadripolar), C2H4 (double bound) or C3H8 which do not exhibit neither. Final results show that adsorption of nitrogen on ZK-4 sodic form is made in a located way on five sites following Langmuir model and none of CO2 and C2H4 chemisorptions was revealed. Besides, the gaseous molecules interactions in presence of divalent cations replacing sodium in ZK-4 are much less higher than in the case of zeolite 4A, and are characteristic of physisorption on relatively heterogeneous sites.

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38

Chong, Kok Chung, Pui San Ho, Soon Onn Lai, Sze Shin Lee, Woei Jye Lau, Shih-Yuan Lu, and Boon Seng Ooi. "Solvent-Free Synthesis of MIL-101(Cr) for CO2 Gas Adsorption: The Effect of Metal Precursor and Molar Ratio." Sustainability 14, no. 3 (January 20, 2022): 1152. http://dx.doi.org/10.3390/su14031152.

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Анотація:

MIL-101(Cr), a subclass of metal–organic frameworks (MOFs), is a promising adsorbent for carbon dioxide (CO2) removal due to its large pore volume and high surface area. Solvent-free synthesis of MIL-101(Cr) was employed in this work to offer a green alternative to the current approach of synthesizing MIL-101(Cr) using a hazardous solvent. Characterization techniques including XRD, SEM, and FTIR were employed to confirm the formation of pure MIL-101(Cr) synthesized using a solvent-free method. The thermogravimetric analysis revealed that MIL-101(Cr) shows high thermal stability up to 350 °C. Among the materials synthesized, MIL-101(Cr) at the molar ratio of chromium precursor to terephthalic organic acid of 1:1 possesses the highest surface area and greatest pore volume. Its BET surface area and total pore volume are 1110 m2/g and 0.5 cm3/g, respectively. Correspondingly, its CO2 adsorption capacity at room temperature is the highest (18.8 mmol/g), suggesting it is a superior adsorbent for CO2 removal. The textural properties significantly affect the CO2 adsorption capacity, in which large pore volume and high surface area are favorable for the adsorption mechanism.

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39

Lakapu, Mada Mariana, and Nurul Widiastuti. "Synthesis of Zeolite-X Supported on Kapok Fiber for CO₂ Capture Material: Variation of Immersion Time during Fiber Activation." Indonesian Journal of Chemistry 17, no. 3 (November 30, 2017): 471. http://dx.doi.org/10.22146/ijc.25162.

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Анотація:

Zeolite-X is a potential material for CO2 adsorption. To increase the performance of zeolite-X, kapok fiber was used as a support material. The growth of zeolite-X on the surface of kapok was affected by activation of the surface. This research aims to optimize the immersion time of kapok fiber using NaOH in order to achieve high crystallinity of the zeolite-X. The Zeolite-X supported on kapok fiber was synthesized by the simple hydrothermal method at immersion time variation of 12 to 36 h. XRD results show that zeolite-X on kapok surface has the highest crystallinity at immersion time of 24 h. The topography of kapok surface from AFM indicates that the surface was damaged due to peeling reaction of NaOH. SEM results show that zeolite-X has grown on the kapok surface in considerable amounts. From TGA analysis, it was shown that the thermal stability of zeolite-X supported on kapok surface was up to 300 °C. Adsorption of CO2 measured by gravimetric method shows that CO2 adsorption capacitywas up to 15.097 wt.% at room temperature.

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40

Rakic, Vesna, Vera Dondur, and Radmila Hercigonja. "FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites." Journal of the Serbian Chemical Society 68, no. 4-5 (2003): 409–16. http://dx.doi.org/10.2298/jsc0305409r.

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In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn2+, Co2 Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120?2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites.

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41

Gęsikiewicz-Puchalska, Andżelika, Michal Zgrzebnicki, Beata Michalkiewicz, Agnieszka Kałamaga, Urszula Narkiewicz, Antoni W. Morawski, and Rafal Wrobel. "Changes in Porous Parameters of the Ion Exchanged X Zeolite and Their Effect on CO2 Adsorption." Molecules 26, no. 24 (December 11, 2021): 7520. http://dx.doi.org/10.3390/molecules26247520.

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Zeolite 13X (NaX) was modified through ion-exchange with alkali and alkaline earth metal cations. The degree of ion exchange was thoroughly characterized with ICP, EDS and XRF methods. The new method of EDS data evaluation for zeolites was presented. It delivers the same reliable results as more complicated, expensive, time consuming and hazardous ICP approach. The highest adsorption capacities at 273 K and 0.95 bar were achieved for materials containing the alkali metals in the following order K < Na < Li, respectively, 4.54, 5.55 and 5.94 mmol/g. It was found that it is associated with the porous parameters of the ion-exchanged samples. The Li0.61Na0.39X form of zeolite exhibited the highest specific surface area of 624 m2/g and micropore volume of 0.35 cm3/g compared to sodium form 569 m2/g and 0.30 cm3/g, respectively. The increase of CO2 uptake is not related with deterioration of CO2 selectivity. At room temperature, the CO2 vs. N2 selectivity remains at a very high stable level prior and after ion exchange in co-adsorption process (XCO2 during adsorption 0.15; XCO2 during desorption 0.95) within measurement uncertainty. Additionally, the Li0.61Na0.39X sample was proven to be stable in the aging adsorption-desorption tests (200 sorption-desorption cycles; circa 11 days of continuous process) exhibiting the CO2 uptake decrease of about 6%. The exchange with alkaline earth metals (Mg, Ca) led to a significant decrease of SSA and micropore volume which correlated with lower CO2 adsorption capacities. Interestingly, the divalent cations cause formation of mesopores, due to the relaxation of lattice strains.

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42

Gomez, Luis Fernando, Renju Zacharia, Pierre Bénard, and Richard Chahine. "Simulation of Binary CO2/CH4Mixture Breakthrough Profiles in MIL-53 (Al)." Journal of Nanomaterials 2015 (2015): 1–15. http://dx.doi.org/10.1155/2015/439382.

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Анотація:

MIL-53 (Al) aluminum terephthalate, a commercial metal-organic framework, has been studied as a potential candidate for pressure swing adsorption separation of CO2/CH4binary mixtures. Pure gas isotherms of CH4and CO2measured over 0–6 MPa and at room temperature are fitted with the Dubinin-Astakhov (D-A) model. The D-A model parameters are used in the Doong-Yang Multicomponent adsorption model to predict the binary mixture isotherms. A one-dimensional multicomponent adsorption breakthrough model is then used to perform a parametric study of the effect of adsorbent particle diameter, inlet pressures, feed flow rates, and feed compositions on the breakthrough performance. Commercial MIL-53 with a particle diameter of 20 μm renders high tortuous flow; therefore it is less effective for separation. More effective separation can be achieved if MIL-53 monoliths of diameters above 200 μm are used. Faster separation is possible by increasing the feed pressure or if the starting compositions are richer in CO2. More CH4is produced per cycle at higher feed pressures, but the shortened time at higher pressures can result in the reduction of the CH4purity.

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43

Wuri, M. A., A. Pertiwiningrum, R. Budiarto, M. Gozan, and A. W. Harto. "The Waste Recycling of Sugarcane Bagasse-Based Biochar for Biogas Purification." IOP Conference Series: Earth and Environmental Science 940, no. 1 (December 1, 2021): 012029. http://dx.doi.org/10.1088/1755-1315/940/1/012029.

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Abstract The utilization of the recycling of biomass waste for carbon dioxide (CO2) adsorption in biogas is still rare. Even though the experiments on the biogas purification still using synthetic biogas. This paper investigated the recycling of biomass waste, sugarcane bagasse for biogas purification. The conversion of biomass into biochar was claimed to expand the surface area of its pores for capturing CO2 in biogas. Five treatments of adsorbents used in this study, 100% volume of zeolite or biochar, 75% volume of zeolite and 25% biochar, 50% volume of zeolite and biochar, 25% volume of zeolite and 25% volume of zeolite, and 25% volume of biochar. The difference of volume treatment in adsorbents affected methane (CH4) and CO2 composition of biogas. Biogas purification by adsorption was conducted at 5-7 bar pressure range and room temperature. Biogas before and after purification were tested of CH4 and CO2 composition by gas chromatography. A significant reduction in CO2 was shown when 50% volume of zeolite was replaced by biochar. The highest in CO2 reduction showed by the composition of 50% sugarcane bagasse-based biochar and 50% natural zeolite. The CO2 decreases did not accompany by the CH4 increases because mesopore-sized still dominated the adsorbents’ pore size.

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44

Guo, Xingmei, Sihan Tang, Yan Song, and Junmin Nan. "Adsorptive removal of Ni2+ and Cd2+ from wastewater using a green longan hull adsorbent." Adsorption Science & Technology 36, no. 1-2 (July 25, 2017): 762–73. http://dx.doi.org/10.1177/0263617417722254.

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The adsorptive removal of Ni2+ and Cd2+ at concentrations of approximately 50 mg L−1 in wastewater is investigated using an agricultural adsorbent, longan hull, and the adsorptive mechanism is characterized. The maximum adsorption capacity of approximately 4.19 mg g−1 Cd2+ was obtained under the optimized conditions of room temperature, pH 5.0, and a solid-to-liquid ratio of 1:30 in approximately 15 min. For Ni2+, the maximum adsorption capacity of approximately 3.96 mg g−1 was obtained at pH 4.7 in approximately 20 min. The adsorption kinetics for both metal ions on the longan hull can be described by a pseudo second-order rate model and are well fitted to the Langmuir adsorption isotherm. The adsorption mechanism of the longan hull to Ni2+ and Cd2+ ions is shown to be a monolayer adsorption of metal ions onto the absorbent surface. Thereinto, the longan hull adsorbent contains N–H, C–H, C=O, and C=C functional groups that can form ligands when loaded with Ni2+ and Cd2+, which reduces the fluorescence of the dried longan hull material.

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45

Firouzi, Amin, Shafreeza Sobri, Faizah Mohd Yasin, and Fakhru'l Razi Ahmadun. "The Effect of CH₄ and CO₂ Exposure on Carbon Nanotubes Electrical Resistance." Advanced Materials Research 214 (February 2011): 655–61. http://dx.doi.org/10.4028/www.scientific.net/amr.214.655.

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This research was carried out to monitor and investigate the gas sensing effects on carbon nanotubes (CNTs) by a systematic study of the variations in the electrical resistance as sensor signal induced by adsorption of CO2 and CH4 gaseous molecules. The CNTs were synthesized by Floating Catalyst Chemical Vapor Deposition (FC-CVD) method on quartz substrate under benzene bubble at temperature of 700°C. Then, they were tested for gas sensing applications operating at room temperature. Upon exposure to gaseous molecules, the electrical resistance of CNTs dramatically increased for both CO2 and CH4 gases with short response time and high sensitivity. It was also observed that the CNTs device behaves as a p-type semiconductor when exposed to gaseous molecules. In addition, the recovery of the sensors and mechanism of gas sensing procedure are discussed.

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46

Hou, Min, Yudan He, Xuewen Yang, Yuchun Yang, Xu Lin, Yongxing Feng, Huan Kan, Huirong Hu, Xiahong He, and Can Liu. "Preparation of Biomass Biochar with Components of Similar Proportions and Its Methylene Blue Adsorption." Molecules 28, no. 17 (August 26, 2023): 6261. http://dx.doi.org/10.3390/molecules28176261.

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Rapeseed straw, bagasse, and walnut peel have a large amount of resource reserves, but there are few technologies for high value-added utilization. In the research of biochar, walnut green husk is rarely used as raw material. In addition, the three main components of biomass (lignin, cellulose, and hemicellulose) are present in similar proportions, and the differences between the physical and chemical properties of biochar prepared with similar amounts of biomass raw materials are not clear. Using three kinds of biomass of the same quality as raw materials, biochar was prepared via pyrolysis at 400 °C, and activated carbon was prepared via CO2 activation at 800 °C. The results showed that the pore numbers of the three kinds of biochar increased after activation, resulting in the increase of the specific surface area. The resulting numbers were 352.99 m2/g for sugarcane bagasse biochar (SBB)-CO2, 215.04 m2/g for rapeseed straw biochar (RSB)-CO2, and 15.53 m2/g for walnut green husk biochar (WGB)-CO2. Ash increased the amount of carbon formation, but a large amount of ash caused biochar to form a perforated structure and decreased the specific surface area (e.g., WGB), which affected adsorption ability. When the three main components were present in similar proportions, a high content of cellulose and lignin was beneficial to the preparation of biochar. The adsorption value of MB by biochar decreased with the increase of biomass ash content. After activation, the maximum adsorption value of MB for bagasse biochar was 178.17 mg/g, rapeseed straw biochar was 119.25 mg/g, and walnut peel biochar was 85.92 mg/g when the concentration of methene blue solution was 300 mg/L and the biochar input was 0.1 g/100 mL at room temperature. The adsorption of MB by biochar in solution occurs simultaneously with physical adsorption and chemical adsorption, with chemical adsorption being dominant. The optimal MB adsorption by SBB-CO2 was dominated by multimolecular-layer adsorption. This experiment provides a theoretical basis for the preparation of biochar and research on its applications in the future.

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47

Granados-Correa, Francisco, and Juan Bonifacio-Martínez. "Synthetic alkaline-earth hydroxyapatites: Influence of their structural, textural, and morphological properties over Co²⁺ ion adsorption capacity." Materials Science-Poland 39, no. 2 (June 1, 2021): 252–64. http://dx.doi.org/10.2478/msp-2021-0022.

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Abstract This work addresses the synthesis of nanocrystalline barium, strontium, and calcium hydroxyapatites (Ca-HAps) via the chemical precipitation method, followed by calcination. To give a coherent picture of the most important structural, textural, and morphological properties of these materials and to investigate the influence of these characteristics over Co2+ ion adsorption capacity from aqueous solutions, the powders prepared were systematically characterized by X-ray diffraction, N2-physisorption measurements, scanning electron microscopy (SEM), energy dispersive X-ray spectrometry, and Fourier Transformed Infrared spectroscopy (FTIR). The results clearly showed that the Ca-HAp obtained exhibits better nanocrystallinity, greater structural stability, high surface area, high total pore volume, and mesoporosity, compared with the other synthesized hydroxyapatites, and that these physicochemical properties share a direct correlation with favorable Co2+ ion adsorption capacity at room temperature and pressure. The results proved that the physicochemical features of resulting alkaline-earth hydroxyapatites, prepared via the chemical precipitation method, played a fundamental role during the adsorption of heavy metal (with high toxicity) from aqueous solutions.

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48

Akimana, Emmanuelia, Jichao Wang, Natalya V. Likhanova, Somboon Chaemchuen, and Francis Verpoort. "MIL-101(Cr) for CO2 Conversion into Cyclic Carbonates, Under Solvent and Co-Catalyst Free Mild Reaction Conditions." Catalysts 10, no. 4 (April 22, 2020): 453. http://dx.doi.org/10.3390/catal10040453.

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Анотація:

Mild reaction conditions (nearly room temperature and atmospheric CO2 pressure) for the cycloaddition of CO2 with epoxides to produce cyclic carbonates were investigated applying MIL-101(Cr) as a catalyst. The MIL-101 catalyst contains strong acid sites, which promote the ring-opening of the epoxide substrate. Moreover, the high surface area, enabling the adsorption of more CO2 (substrate), combined with a large pore size of the catalyst is essential for the catalytic performance. Additionally, epoxide substrates bearing electron-withdrawing substituents or having a low boiling point demonstrated an excellent conversion towards the cyclic carbonates. MIL-101(Cr) for the cycloaddition of carbon dioxide with epoxides is demonstrated to be a robust and stable catalyst able to be re-used at least five times without loss in activity.

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49

MORI, E. E., and M. KAMARATOS. "ADSORPTION KINETICS OF POTASSIUM ON SrTiO3(100)." Surface Review and Letters 13, no. 05 (October 2006): 681–86. http://dx.doi.org/10.1142/s0218625x06008657.

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In this paper, we study the kinetics of potassium adsorption on SrTiO 3(100) surface at room temperature. The study took place in UHV using AES, EELS, LEED, TPD, and WF measurements. Potassium grows in two-dimensional islands with maximum coverage of 3.9 × 1014 at/cm2. During adsorption charge transfer from the K -4s to Ti -3d energy level has been observed. No K – O compound has been measured. After heating at 1050 K most of the adsorbed potassium desorbs and the SrTiO 3(100) (1 × 1) LEED pattern reappears. There is not any indication of potassium intercalation into the substrate, either at room or at elevated temperature.

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50

Zhou, Xiu Yan, and Xiang Xin Xue. "Study on Adsorption of Heavy Metalion in Metallurgical Wastewater by Sepiolite." Advanced Materials Research 726-731 (August 2013): 2585–88. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2585.

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In this study, the sorption of heavy metals (Cu2+, Pb2+, Zn2+ and Cd2+) from simulated metallurgical wastewater by sepiolite under different dosage, pH, adsorption time and temperature conditions was investigated. The results showed that adsorption increased with the increase of adsorbent dosage until the adsorption equilibrium was reached. When the pH is 6, adsorption of heavy metal ions by sepiolite was in the order of Cu2+ > Zn2+ > Pb2+ > Cd2+ and removal rates of the metal ion were 91%, 90%, 91%, 84%, respectively. The effect of adsorption time on adsorption was not significant. At room temperature, with the adsorption time 45 min, the adsorption of metal ions is almost saturated, adsorption of Cu2+, Pb2+, Cd2+ and Zn2+ was 13.05mg/g, 85.47mg/g, 62.36mg/g and 15.67mg/g, respectively.

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Статті в журналах з теми "Room Temperature CO2 Adsorption"

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