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Journal articles on the topic 'Nanorods' purification'

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Author: Grafiati

Published: 10 March 2023

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1

Shi, Weihong, Justin Casas, Meenakshi Venkataramasubramani, and Liang Tang. "Synthesis and Characterization of Gold Nanoparticles with Plasmon Absorbance Wavelength Tunable from Visible to Near Infrared Region." ISRN Nanomaterials 2012 (October 15, 2012): 1–9. http://dx.doi.org/10.5402/2012/659043.

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Gold nanorods with localized surface plasmon resonance (LSPR) can be chemically synthesized. We systematically investigated the effects of reaction parameters and centrifugation on the fine tuning of the rod dimension in scale-up production (80–100 mL). Nanorods of absorption bands from 600–1050 nm were fabricated with precise control of the aspect ratio (AR) from 1.5 to 8.9. Although all chemicals are important in directing the nanostructure, silver ion concentration and seed/Au3+ ratio were the most effective variations to adjust the absorption wavelength. With a single surfactant under the influence of silver nitrate, short nanorods up to AR of 5 were synthesized with corresponding maximum absorption wavelength at 902 nm. To achieve higher aspect ratio with absorption band beyond 1,000 nm, two-surfactant growth solution was sought to further elongate the rod length. Centrifugation speed and times were found to exert significant influences on the final rod dimension, which is important during the purification process. In a relatively large quantity nanorod synthesis, even distribution and sufficient mixing of chemical ingredients play an essential role in determining the yield, uniformity, and stability of the final nanorod formation.

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2

Ognibene, G., D. A. Cristaldi, R. Fiorenza, I. Blanco, G. Cicala, S. Scirè, and M. E. Fragalà. "Photoactivity of hierarchically nanostructured ZnO–PES fibre mats for water treatments." RSC Advances 6, no. 49 (2016): 42778–85. http://dx.doi.org/10.1039/c6ra06854e.

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3

Wu, Yi-Han, Qing-Feng Chen, Jia-Nan Wang, Ting Liu, and Wei-Yi Zhao. "Substrates, Plants, and Their Combinations for Water Purification of Urban Household Aquaponics Systems." International Journal of Environmental Research and Public Health 19, no. 16 (August 18, 2022): 10276. http://dx.doi.org/10.3390/ijerph191610276.

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To make full use of urban household balcony space, an urban aquaponics system for balconies was constructed to investigate the purification effects of four different substrates (volcanic stone, ceramic pellets, ceramic rings, and nanorods) and six plants (mung bean sprouts, hollow cabbage, water celery, lettuce, leek, and water chestnut) on fish culture wastewater. Through the determination of contaminants such as nitrogen and phosphorus and through the use of 16SrDNA sequencing technology, the substrate material and plant combinations with the best purification effects were screened. The results show that volcanic stone and nanorods have strong purification capacities. Compared to the other substrate types, there were more unique bacterial species on the surface of volcanic stone, among which amoeba species were the most dominant (92.42%). Among the six tested plant species, mung bean sprouts had the highest contribution to nitrogen uptake (94.96%), and water chestnut had the highest contribution to phosphorus uptake at 12.07%. Finally, the combination of nanorods and water celery was the best at purifying the wastewater. This study provides a theoretical basis and new ideas for the construction of urban aquaponics systems on balconies, which will help to achieve green farming and the efficient utilization of water resources.

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4

Elkady, M. F., H. Shokry Hassan, and Eslam Salama. "Sorption Profile of Phosphorus Ions onto ZnO Nanorods Synthesized via Sonic Technique." Journal of Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/2308560.

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High surface area zinc oxide material in nanorod morphological structure was synthesized using an ultrasonic technique in the presence of polyvinyl pyrrolidone as stabilizing agent. The crystallite, morphology, and surface area of the prepared white powder material were identified using XRD, SEM, and BET techniques, respectively. X-ray analysis confirms the high purity of synthesized ZnO. The evaluated specific surface area of prepared ZnO was 16.7 m2/g; this value guarantees high efficiency for water purification. The feasibility of synthesized ZnO nanorods for phosphorus sorption from aqueous solution was established using batch technique. Nano-zinc oxide exhibits high efficiency for phosphorus removal; the equilibrium state was recorded within 90 minutes. The most effective hydrogen ion concentration of the polluted solution was recorded at pH = 1 for phosphorus decontamination. The equilibrium of phosphorus sorption onto ZnO nanorods was well explained using both Langmuir and Temkin isotherm models. The calculated maximum monolayer sorption capacity was 89 mg/g according to Langmuir isotherm at 27°C. In order to explain the phosphorus sorption mechanism onto the prepared ZnO nanorods, three simplified kinetic models of pseudo-first order, pseudo-second order, and intraparticle diffusion rate models were tested. Kinetics was well fitted by pseudo-second order kinetic model with a contribution of intraparticle diffusion.

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5

Fang, Shiming, Yuanzhi Li, Yi Yang, Jian Chen, Huihui Liu, and Xiujian Zhao. "Mg-doped OMS-2 nanorods: a highly efficient catalyst for purification of volatile organic compounds with full solar spectrum irradiation." Environmental Science: Nano 4, no. 9 (2017): 1798–807. http://dx.doi.org/10.1039/c7en00567a.

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6

Scaletti, Federica, Chang Soo Kim, Luigi Messori, and Vincent M. Rotello. "Rapid purification of gold nanorods for biomedical applications." MethodsX 1 (2014): 118–23. http://dx.doi.org/10.1016/j.mex.2014.07.007.

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7

Raul, Prasanta Kumar, Samarpita Senapati, Ashish K. Sahoo, Iohborlang M. Umlong, Rashmi R. Devi, Ashim Jyoti Thakur, and Vijay Veer. "CuO nanorods: a potential and efficient adsorbent in water purification." RSC Adv. 4, no. 76 (2014): 40580–87. http://dx.doi.org/10.1039/c4ra04619f.

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8

Ikram, M., A. Shahzadi, S. Hayat, W. Nabgan, A. Ul-Hamid, A. Haider, M. Noor, Souraya Goumri-Said, Mohammed Benali Kanoun, and S. Ali. "Novel Ta/chitosan-doped CuO nanorods for catalytic purification of industrial wastewater and antimicrobial applications." RSC Advances 12, no. 27 (2022): 16991–7004. http://dx.doi.org/10.1039/d2ra03006c.

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9

Sanchez, Luis, Carlos Castillo, Willy Cruz, Bryan Yauri, Miguel Sosa, Clemente Luyo, Roberto Candal, Silvia Ponce, and Juan M. Rodriguez. "ZnO (Ag-N) Nanorods Films Optimized for Photocatalytic Water Purification." Coatings 9, no. 11 (November 19, 2019): 767. http://dx.doi.org/10.3390/coatings9110767.

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ZnO nanorods (NRs) films, nitrogen-doped (ZnO:N), and ZnO doped with nitrogen and decorated with silver nanostructures (ZnO:N-Ag) NRs films were vertically supported on undoped and N doped ZnO seed layers by a wet chemical method. The obtained films were characterized structurally by X-ray diffraction. Morphological and elemental analysis was performed by scanning electron microscopy, including an energy dispersive X-ray spectroscopy facility and their optical properties by Ultraviolet-Visible Spectroscopy. Analysis performed in the NRs films showed that the nitrogen content in the seed layer strongly affected their structure and morphology. The mean diameter of ZnO NRs ranged from 70 to 190 nm. As the nitrogen content in the seed layer increased, the mean diameter of ZnO:N NRs increased from 132 to 250 nm and the diameter dispersion decreased. This diameter increase occurs simultaneously with the incorporation of nitrogen into the ZnO crystal lattice and the increase in the volume of the unit cell, calculated using the X-ray diffraction patterns and confirmed by a slight shift in the XRD angle. The diffractograms indicated that the NRs have a hexagonal wurtzite structure, with preferential growth direction along the c axis. The SEM images confirmed the presence of metallic silver in the form of nanoparticles dispersed on the NRs films. Finally, the degradation of methyl orange (MO) in an aqueous solution was studied by UV-vis irradiation of NRs films contained in the bulk of aqueous MO solutions. We found a significant enhancement of the photocatalytic degradation efficiency, with ZnO:N-Ag NRs film being more efficient than ZnO:N NRs film, and the latter better than the ZnO NRs film.

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10

Zuo, Gang, Haibin Chen, Yu Yang, Bowen Zhou, Han Xiao, and Wei Xiao. "Room-temperature oxidation of gaseous HCHO over metal molybdate nanorods with Pt as co-catalysts." Functional Materials Letters 08, no. 06 (October 26, 2015): 1550079. http://dx.doi.org/10.1142/s1793604715500794.

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High-efficiency, cost-affordable and environmentally sound catalysts are urgently needed for indoor air purification. Herein, we report the first investigation on room-temperature removal capabilities of AMoO 4 ( A = Ni and Co ) and derived molybdate– Pt composites with uniform nanorod morphology. The HCHO removal or oxidation capabilities and mechanisms are also compared and rationalized, which, we hope, can form a solid basis for potential applications of molybdate for indoor air purification.

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11

Khanal, Bishnu P., and Eugene R. Zubarev. "Purification of High Aspect Ratio Gold Nanorods: Complete Removal of Platelets." Journal of the American Chemical Society 130, no. 38 (September 24, 2008): 12634–35. http://dx.doi.org/10.1021/ja806043p.

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12

Nair, Santhosh S., Jianhong Chen, Adam Slabon, and Aji P. Mathew. "Converting cellulose nanocrystals into photocatalysts by functionalisation with titanium dioxide nanorods and gold nanocrystals." RSC Advances 10, no. 61 (2020): 37374–81. http://dx.doi.org/10.1039/d0ra05961g.

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Cellulose nanocrystals (CNCs) are promising building blocks for water purification due to their high surface area, tuneability of surface charge and grafting of surface groups depending on the pollutants.

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13

Liu, Lianke, Zhirui Guo, Lina Xu, Ruizhi Xu, and Xiang Lu. "Facile purification of colloidal NIR-responsive gold nanorods using ions assisted self-assembly." Nanoscale Research Letters 6, no. 1 (2011): 143. http://dx.doi.org/10.1186/1556-276x-6-143.

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14

Baruah, Sunandan, Mayuree Jaisai, and Joydeep Dutta. "Development of a visible light active photocatalytic portable water purification unit using ZnO nanorods." Catalysis Science & Technology 2, no. 5 (2012): 918. http://dx.doi.org/10.1039/c2cy20033c.

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15

Bogliotti, Nicolas, Birgit Oberleitner, Aurélie Di-Cicco, Frédéric Schmidt, Jean-Claude Florent, and Vincent Semetey. "Optimizing the formation of biocompatible gold nanorods for cancer research: Functionalization, stabilization and purification." Journal of Colloid and Interface Science 357, no. 1 (May 2011): 75–81. http://dx.doi.org/10.1016/j.jcis.2011.01.053.

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16

Boksebeld, Maxime, Nicholas P. Blanchard, Ali Jaffal, Yann Chevolot, and Virginie Monnier. "Shape-selective purification of gold nanorods with low aspect ratio using a simple centrifugation method." Gold Bulletin 50, no. 1 (January 27, 2017): 69–76. http://dx.doi.org/10.1007/s13404-017-0197-9.

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17

Tang, Yin, Tang Zhu, Huichao Liu, Zheng Tang, Xingwen Kuang, Yongna Qiao, Hao Zhang, and Caizhen Zhu. "Hydrogel/β-FeOOH-Coated Poly(vinylidene fluoride) Membranes with Superhydrophilicity/Underwater Superoleophobicity Facilely Fabricated via an Aqueous Approach for Multifunctional Applications." Polymers 15, no. 4 (February 8, 2023): 839. http://dx.doi.org/10.3390/polym15040839.

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Hydrogel coatings that can endow various substrates with superior properties (e.g., biocompatibility, hydrophilicity, and lubricity) have wide applications in the fields of oil/water separation, antifouling, anti-bioadhesion, etc. Currently, the engineering of multifunctional hydrogel-coated materials with superwettability and water purification property using a simple and sustainable strategy is still largely uninvestigated but has a beneficial effect on the world. Herein, we successfully prepared poly(2-acrylamido-2-methyl-1-propanesulfonic acid) hydrogel/β-FeOOH-coated poly(vinylidene fluoride) (PVDF/PAMPS/β-FeOOH) membrane through free-radical polymerization and the in situ mineralization process. In this work, owing to the combination of hydrophilic PAMPS hydrogel coating and β-FeOOH nanorods anchored onto PVDF membrane, the resultant PVDF/PAMPS/β-FeOOH membrane achieved outstanding superhydrophilicity/underwater superoleophobicity. Moreover, the membrane not only effectively separated surfactant-stabilized oil/water emulsions, but also possessed a long-term use capacity. In addition, excellent photocatalytic activity against organic pollutants was demonstrated so that the PVDF/PAMPS/β-FeOOH membrane could be utilized to deal with wastewater. It is envisioned that these hydrogel/β-FeOOH-coated PVDF membranes have versatile applications in the fields of oil/water separation and wastewater purification.

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18

Choi, Yong Ho, Moon-Ju Kim, Jia Lee, Jae-Chul Pyun, and Dahl-Young Khang. "Recyclable, Antibacterial, Isoporous Through-Hole Membrane Air Filters with Hydrothermally Grown ZnO Nanorods." Nanomaterials 11, no. 12 (December 13, 2021): 3381. http://dx.doi.org/10.3390/nano11123381.

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Reusable, antibacterial, and photocatalytic isoporous through-hole air filtration membranes have been demonstrated based on hydrothermally grown ZnO nanorods (NRs). High-temperature (300~375 °C) stability of thermoset-based isoporous through-hole membranes has enabled concurrent control of porosity and seed formation via high-temperature annealing of the membranes. The following hydrothermal growth has led to densely populated ZnO NRs on both the membrane surface and pore sidewall. Thanks to the nanofibrous shape of the grown ZnO NRs on the pore sidewall, the membrane filters have shown a high (>97%) filtration efficiency for PM2.5 with a rather low-pressure (~80 Pa) drop. The membrane filters could easily be cleaned and reused many times by simple spray cleaning with a water/ethanol mixture solution. Further, the grown ZnO NRs have also endowed excellent bactericidal performance for both Gram-positive S. aureus and Gram-negative S. enteritidis bacteria. Owing to the wide bandgap semiconductor nature of ZnO NRs, organic decomposition by photocatalytic activity under UV illumination has been successfully demonstrated. The reusable, multifunctional membrane filters can find wide applications in air filtration and purification.

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19

Barnasas, Alexandros, Michalis V. Karavasilis, Christos Aggelopoulos, Christos D. Tsakiroglou, and Panagiotis Poulopoulos. "Growth and Characterization of Nanostructured Ag-ZnO for Application in Water Purification." Journal of Nano Research 62 (April 2020): 75–86. http://dx.doi.org/10.4028/www.scientific.net/jnanor.62.75.

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In this work, a low-cost method to produce ZnO nanostructured materials for the treatment of water polluted with model organic pollutants (e.g. dyes) is presented. Zinc and silver-coated Zn (Ag/Zn) films, fabricated via sputtering method were naturally oxidized via a simple, low-temperature, scalable thermal process. During oxidation, Ag/ZnO nanorods were grown on Zn foils after treating their surface with various agents (e.g. acids) and annealing in an oven at temperatures 385-400 °C. The ZnO and Ag/ZnO films on Zn were characterized by X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. The cationic dye Methylene Blue (MB) was selected as model pollutant dissolved in water, and a batch photo-reactor was fabricated and used to to study the adsorption capacity and photocatalytic performance of films. The transient varation of MB concentration in aqueous solutions was measured with UV-Vis spectroscopy. Ag/ZnO demonstrated a strong MB adsorbion capacity in dark conditions, and a satisfactory MB photocatalytic degradation under UV light irradiation.The optimized doping of Ag in Ag/ZnO film enhanced its photocatalytic activity, and seems well-promising for the potential scale-up of Ag/ZnO films, and use in large-scale systems for water purification under UV light irradiation.

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20

Kim, Young Been, Sung Woon Cho, Nishad G. Deshpande, Sung Hyeon Jung, Dong Su Kim, Ki Ju Park, Han‐Ki Kim, and Hyung Koun Cho. "Smart Bifunctional Sb 2 Se 3 Nanorods for Integrated Water Purification: Insoluble Liquid Separation and Photoelectrochemical Degradation." ChemSusChem 13, no. 11 (April 23, 2020): 3017–27. http://dx.doi.org/10.1002/cssc.202000438.

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21

Xanthopouloua, G. G., V. A. Novikova, Yu A. Knysha, and A. P. Amosova. "Nanocatalysts for Low-Temperature Oxidation of CO: Review." Eurasian Chemico-Technological Journal 17, no. 1 (December 19, 2014): 17. http://dx.doi.org/10.18321/ectj190.

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<p>The oxidation of CO covers a wide range of applications from gas masks, gas sensors, indoor air quality control to hydrogen purification for polymer electrolyte fuel cells. The reaction attracts renewed interest both in fundamental and applied research of catalysis and electrochemistry. Recent developments and trends in catalysis towards the synthesis of nanocatalysts for CO oxidation are discussed in this review. Different modifications made to conventional catalysts synthesis approaches for preparation of nanocatalysts are critically analyzed. Nanocatalysts developed on the basis of noble metals completely convert CO at temperatures below 0 °C. The development of active and stable catalysts without noble metals for low-temperature CO oxidation is a significant challenge. It was found that Co<sub>3</sub>O<sub>4</sub> nanorods can be steadily active for CO oxidation at a temperature as low as –77 °C. High activity of catalysts at low temperatures connected with nanosize particles and high surface area. This review summarized main directions of nanocatalysts development for CO low temperature oxidation.</p>

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22

Zhao, Meixia, Jiguo Huang, Xueting Guo, Haitao Chen, Hai Zhao, Lili Dong, and Xing-juan Liu. "Preparation of Na2Ti3O7/Titanium Peroxide Composites and Their Adsorption Property on Cationic Dyes." Journal of Chemistry 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/363405.

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Na2Ti3O7/titanium peroxide composites (TN-TP) were successfully prepared with the reaction of Ti foils, NaOH, and H2O2at 60°C for 24 h in water bath. The Na2Ti3O7appeared as nanorods in composites. Water bath temperature, water bath time, and the concentration of H2O2and NaOH were crucial. The reaction mechanism was proposed. TN-TP was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric and differential scanning calorimetry (TG-DSC). TN-TP was a mesoporous material and exhibited stronger adsorption capability for neutral red (NR), malachite green (MG), methylene blue (MB), and crystal violet (CV) than pure Na2Ti3O7and pure titanium peroxide, and the saturated adsorption capacities were 490.21, 386.13, 322.81, and 292.74 mg/g at 25°C, respectively. It was found that the pseudo-second-order kinetic model and the Langmuir model could well describe the adsorption kinetic and isotherm of cationic dyes studied. The results of this work are of great significance for environmental applications of TN-TP as a promising adsorbent material for dyeing water purification.

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23

Li, Xiangyu, Weifeng Zhang, Na Liu, Ruixiang Qu, Yen Wei, and Lin Feng. "Superwetting copper meshes based on self-organized robust CuO nanorods: efficient water purification for in situ oil removal and visible light photodegradation." Nanoscale 10, no. 9 (2018): 4561–69. http://dx.doi.org/10.1039/c7nr09201f.

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24

Margheri, Giancarlo, Silvana Trigari, Mariabeatrice Berti, Maurizio Muniz Miranda, and Rita Traversi. "Chitosan-Capped Au Nanoparticles for Laser Photothermal Ablation Therapy: UV-Vis Characterization and Optothermal Performances." Journal of Spectroscopy 2018 (July 10, 2018): 1–11. http://dx.doi.org/10.1155/2018/8271254.

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We have reported on the synthesis and characterization of near-infrared- (NIR-) absorbing colloidal nanoparticles prepared by exploiting the one-step reaction of HAuCl4 and Na2S2O3, followed by their stabilization with chitosan. This reaction also produces a big amount of unwanted nanoparticles detuned with respect to the NIR spectral region. For this reason, it is usually assumed that the product has to be filtered and enriched to enhance its NIR absorption, and the possible exploitation of the simpler raw product has never been worthy to be considered. Aiming to investigate this missing aspect, we chose to avoid the purification steps and rather focused on the preparation of the unrefined colloid, identifying the synthesis conditions that maximize its NIR absorbance and, subsequently, testing it as an optothermal transducer by measuring its molar heating rate (MHR). As expected, we found that the performances of the raw colloid are indeed lower than those of its refined version, but only to a limited extent. Moreover, MHR is unexpectedly higher than that deducible for other classical NIR-absorbing nanoparticles, like Au nanorods or Au nanostars. Thus, the product of the simpler preparation protocol appears as a competitive trade-off solution between easy manufacturing and optothermal performances.

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25

Zhang, Yangyang, Yiping Guo, Qi Du, Huanan Duan, Yujie Chen, Hua Li, and Hezhou Liu. "Oxygen vacancies induced self-assembling synthesis of V 4+ -BiVO 4 /rGO core-shell nanorods with enhanced water splitting efficiency and superior sewage purification capability." Applied Catalysis A: General 526 (September 2016): 105–12. http://dx.doi.org/10.1016/j.apcata.2016.08.012.

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26

Gahlaut, Shashank K., Pinki Devi, and J. P. Singh. "Self-sustainable and recyclable Ag nanorods for developing Ag-Ag2S nano heterostructures using sewage gas: Applications in photocatalytic water purification, hydrogen evolution, SERS and antibacterial activity." Applied Surface Science 528 (October 2020): 147037. http://dx.doi.org/10.1016/j.apsusc.2020.147037.

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27

Sabet, Mohammad, Marziyeh Mohammadi, and Fatemeh Googhari. "Prominent Visible Light Photocatalytic and Water Purification Activity of PbS/CdS/CdO Nanocomposite Synthesized via Simple Co-Precipitation Method." Nanoscience &Nanotechnology-Asia 9, no. 2 (June 25, 2019): 278–84. http://dx.doi.org/10.2174/2210681208666180329152523.

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Background: Due to unique chemical and physical properties and potential application in many fields, nanostructured materials have attracted many attentions. Cadmium sulfide (CdS) is a semiconductor that has a wide band gap of 2.42 eV at room temperature and can be served in solar cells and photoluminescence devices. Cadmium sulfide (CdS) is a kind of attractive semiconductor material, and it is now widely used for optoelectronic applications. CdS nano and microstructures can be synthesized via different chemical methods such as microwave-solvothermal synthesis, surfactant-ligand coassisting solvothermal method and hydrothermal route. Also different morphologies of this semiconductor such as dendrites, nanorods, sphere-like, flakes, nanowires, flower-like shape triangular and hexagonal plates, were synthesized. Methods: To synthesis of the nanocomposite, a simple co-precipitation method was served. In briefly, 0.1 g of Pb(NO3)2 was dissolved in the distilled water (Solution 1). Also different aqueous solutions were made from dissolving different mole ratio of Cd(NO3)2.6H2O respect to the lead source in the water (Solution 2). Two solutions were mixed together under vigorous stirring and then S2- solution (0.02 g thiourea in the water) was added to the Pb2+/Cd2+ solution. After that 0.1 g of CTAB as surfactant was added to the final solution. Finally to the synthesis of both sulfide and oxide nanostructures, NaOH solution was added to the prepared solution to obtain pH= 10. Distilled water and absolute ethanol were used to wash the obtained precipitate and then it dried at 80 °C for 8 h. Results: From the XRD pattern it was found that the peaks placed at 24.9°, 27°, 44.1°, 48°, 52°, 54°, 57.8°, 66.8°, 71.2° are associated to CdS compound with hexagonal phase (JCPDS=00-001-0780) that belong to (100), (002), (110), (103), (112), (201), (202), (203), (211) Miller indices respectively. The Other peaks belong to PbS with hexagonal phase (JCPDS=01-078-1897), and CdO with cubic phase (JCPDS=00-001-1049). From SEM images, it was found by choosing the mole ratio to 1:1, very small and uniform particles were achieved. By increasing Pb2+/Cd2+ mole ratio to 1:2, very tiny particles aggregated together were achieved. Conclusion: The results showed that the product can adsorb extra 80% of heavy metal ions from the water. So it can be said that the nanocomposite can be used in the water treatment due to its high photocatalytic and surface adsorption activities. In other words, it can remove heavy metals from the water and also decompose organic pollutions.

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Thai, T., Y. Zheng, S. H. Ng, H. Ohshima, M. Altissimo, and U. Bach. "Facile gold nanorod purification by fractionated precipitation." Nanoscale 6, no. 12 (2014): 6515–20. http://dx.doi.org/10.1039/c4nr01592d.

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29

Zhao, Yuanyuan, Peifei Tong, Dong Ma, Bing Li, Qinzhuang Liu, San Chen, and Yongxing Zhang. "A Facile Route to the Preparation of Highly Uniform ZnO@TiO2 Core-Shell Nanorod Arrays with Enhanced Photocatalytic Properties." Journal of Chemistry 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/8579896.

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Design and synthesis of ZnO@TiO2 core-shell nanorod arrays as promising photocatalysts have been widely reported. However, it remains a challenge to develop a low-temperature, low-cost, and environmentally friendly method to prepare ZnO@TiO2 core-shell nanorod arrays over a large area for future device applications. Here, a facile, green, and efficient route is designed to prepare the ZnO@TiO2 nanorod arrays with a highly uniform core-shell structure over a large area on Zn wafer via a vapor-thermal method at relatively low temperature. The growth mechanism is proposed as a layer-by-layer assembly. The photocatalytic decomposition reaction of methylene blue (MB) reveals that the ZnO@TiO2 core-shell nanorod arrays have excellent photocatalytic activities when compared with the performance of the ZnO nanorod arrays. The improved photocatalytic activity could be attributed to the core-shell structure, which can effectively reduce the recombination rate of electron-hole pairs, significantly increase the optical absorption range, and offer a high density of surface active catalytic sites for the decomposition of organic pollutants. In addition, it is very easy to separate or recover ZnO@TiO2 core-shell nanorod array catalysts when they are used in water purification processes.

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30

Wang, Shan-Jiang, Xiao-Yang Zhang, Dan Su, Yun-Fan Wang, Chun-Meng Qian, Xin-Ru Zhou, Yi-Zhi Li, and Tong Zhang. "Electrospinning Ag-TiO2 Nanorod-Loaded Air Treatment Filters and Their Applications in Air Purification." Molecules 25, no. 15 (July 24, 2020): 3369. http://dx.doi.org/10.3390/molecules25153369.

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The efficient treatment of the problem of air pollution is a practical issue related to human health. The development of multi-functional air treatment filters, which can remove various kinds of pollutants, including particulate matter (PM) and organic gases, is a tireless pursuit aiming to address the actual needs of humans. Advanced materials and nano-manufacturing technology have brought about the opportunity to change conventional air filters for practical demands, with the aim of achieving the high-efficiency utilization of photons, a strong catalytic ability, and the synergetic degradation of multi-pollutants. In this work, visible-responding photocatalytic air treatment filters were prepared and combined with a fast and cost-effective electrospinning process. Firstly, we synthesized Ag-loaded TiO2 nanorod composites with a controlled size and number of loaded Ag nanoparticles. Then, multi-functional air treatment filters were designed by loading catalysts on electrospinning nanofibers combined with a programmable brush. We found that such Ag-TiO2 nanorod composite-loaded nanofibers displayed prominent PM filtration (~90%) and the degradation of organic pollutants (above 90%). The superior performance of purification could be demonstrated in two aspects. One was the improvement of the adsorption of pollutants derived from the increase of the specific surface area after the loading of catalysts, and the other was the plasmonic hot carriers, which induced a broadening of the optical absorption in the visible light range, meaning that many more photons were utilized effectively. The designed air treatment filters with synergistic effects for eliminating both PM and organic pollutants have promising potential for the future design and application of novel air treatment devices.

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Burks, T., F. Akthar, M. Saleemi, M. Avila, and Y. Kiros. "ZnO-PLLA Nanofiber Nanocomposite for Continuous Flow Mode Purification of Water from Cr(VI)." Journal of Environmental and Public Health 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/687094.

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Nanomaterials of ZnO-PLLA nanofibers have been used for the adsorption of Cr(VI) as a prime step for the purification of water. The fabrication and application of the flexible ZnO-PLLA nanofiber nanocomposite as functional materials in this well-developed architecture have been achieved by growing ZnO nanorod arrays by chemical bath deposition on synthesized electrospun poly-L-lactide nanofibers. The nanocomposite material has been tested for the removal and regeneration of Cr(IV) in aqueous solution under a “continuous flow mode” by studying the effects of pH, contact time, and desorption steps. The adsorption of Cr(VI) species in solution was greatly dependent upon pH. SEM micrographs confirmed the successful fabrication of the ZnO-PLLA nanofiber nanocomposite. The adsorption and desorption of Cr(VI) species were more likely due to the electrostatic interaction between ZnO and Cr(VI) ions as a function of pH. The adsorption and desorption experiments utilizing the ZnO-PLLA nanofiber nanocomposite have appeared to be an effective nanocomposite in the removal and regeneration of Cr(VI) species.

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Yang, Tung-Han, Li-De Huang, Yeu-Wei Harn, Chun-Cheng Lin, Jan-Kai Chang, Chih-I. Wu, and Jenn-Ming Wu. "High Density Unaggregated Au Nanoparticles on ZnO Nanorod Arrays Function as Efficient and Recyclable Photocatalysts for Environmental Purification." Small 9, no. 18 (May 5, 2013): 3169–82. http://dx.doi.org/10.1002/smll.201300424.

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Chae, Soosang, Jimin Yu, Jin Young Oh, and Tae Il Lee. "Hybrid poly (3-hexylthiophene) (P3HT) nanomesh/ZnO nanorod p-n junction visible photocatalyst for efficient indoor air purification." Applied Surface Science 496 (December 2019): 143641. http://dx.doi.org/10.1016/j.apsusc.2019.143641.

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Chen, Zhangxu, Baorong Wu, Xiaodan Huang, Xianxue Li, and Yonglong Lin. "Biomimetic Synthesis of Hydroxyapatite in Presence of Imidazole-4,5-dicarboxylic Acid Grafted Chitosan for Removing Chromium(VI)." Journal of Nanotechnology 2018 (June 3, 2018): 1–7. http://dx.doi.org/10.1155/2018/5431290.

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In order to biomimetic synthesize hydroxyapatite similar to natural bone. Hydroxyapatite (HAP) is biomimetic synthesized in simulated body fluid (SBF) by addition of imidazole-4,5-dicarboxylic acid grafted chitosan (IDACS). The effect of molar ratio of chitosan (CS) to imidazole-4,5-dicarboxylic acid (IDA) on preparation of HAP was investigated. The structure, size, and crystal phase of the obtained hydroxyapatite were observed by Fourier transform infrared spectroscopy, X-ray powder diffraction, and scanning electron microscopy. The results show that the molar ratio of CS to IDA is 1 : 3, the temperature is 37.0°C, the aging time is 48 h, the synthesized nanorod-like hydroxyapatite with diameter 20–30 nm, and length ranging from 75 to 120 nm presents excellent phase, which disperses well and is similar to the natural bone of HAP. The obtained HAP can be used to remove chromium(VI) by the orthogonal experiments, and the results indicated that the removal rate can reach 95.66% under the optimum conditions. These results suggest that the morphology of the obtained HAP is more affected by the material ratio of chitosan to imidazole-4,5-dicarboxylic acid than its structure, and the obtained HAP can effectively remove Cr(VI), which provides a novel method for biomimetic synthesis of other biomaterials and application in the water purification.

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Eslami, A., B. Akbari-Adergani, A. Mohseni-Bandpei, M. Rabbani, and M. H. Saghi. "Synthesis and characterization of a coated Fe-Ag@ZnO nanorod for the purification of a polluted environmental solution under simulated sunlight irradiation." Materials Letters 197 (June 2017): 205–8. http://dx.doi.org/10.1016/j.matlet.2017.02.096.

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Chong, K. C., S. S. Lee, S. O. Lai, H. S. Thiam, P. S. Ho, and W. J. Lau. "Adsorption of Carbon Dioxide by Metal Organic Framework for Indoor Air Quality Enhancement." IOP Conference Series: Materials Science and Engineering 1192, no. 1 (November 1, 2021): 012024. http://dx.doi.org/10.1088/1757-899x/1192/1/012024.

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Abstract Air pollution has become a severe environmental issue among millions of people around the globe. However, the risk of exposure to indoor air pollution is much higher than outdoor air pollution. The most effective way to improve indoor air quality (IAQ) by reducing the indoor CO2 content is by capturing and storing. There are several types of adsorbents used to capture CO2, namely physical adsorbents and chemical adsorbents. Metal-Organic Framework (MOF) is one of the recent interests arising physical adsorbents which possesses high adsorption capability. In this study, MOFs fabricated with different metals and organic ligands were used to evaluate their performance in CO2 adsorption under an enclosed office space. Magnesium, chromium, and copper metals were used as the main element in the MOF fabrication coupled with trimesic acid as an organic ligand. The MOFs’ morphologies generally illustrated that magnesium MOF exhibited a dispersed nanorod flask crystal, chromium MOF showed agglomeration crystal, whereas fine crystal rod was observed in copper MOF. The elemental analysis from EDX and XRD confirmed that the metals were successfully embedded with the organic ligand, which is similar to the literature studies. The CO2 gas adsorption study suggested that magnesium MOF fabricated with trimesic acid possess superior CO2 adsorption capability as the recorded CO2 concentration reduced from 960 ± 73 ppm to 895 ± 57 under 2 hours continuous sampling time. The CO2 adsorption study reveals that the magnesium MOF with trimesic acid ligand yields a promising result on indoor CO2 concentration reduction. This result suggested that the MOF possesses a great potential to be applied in the indoor air quality enhancement with the integration to the existing air purification and/or filtration system.

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Belal, Ahmed S., Jehan El Nady, Azza Shokry, Shaker Ebrahim, Moataz Soliman, and Marwa Khalil. "Superhydrophobic functionalized cellulosic paper by copper hydroxide nanorods for oils purification." Scientific Reports 11, no. 1 (August 10, 2021). http://dx.doi.org/10.1038/s41598-021-95784-z.

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AbstractOily water contamination has been sighted as one of the most global environmental pollution. Herein, copper hydroxide nanorods layer was constructed onto cellulosic filter paper surface cured with polydopamine, Ag nanoparticles, and Cu NPs through immersion method. This work has been aimed to produce a superhydrophobic and superoleophilic cellulosic filter paper. The structure, crystalline, and morphological properties of these modified cellulosic filter paper were investigated. Scanning electron microscope images confirmed that the modified surface was rougher compared with the pristine surface. The contact angle measurement confirmed the hydrophobic nature of these modified surfaces with a water contact angle of 169.7°. The absorption capacity was 8.2 g/g for diesel oil and the separation efficiency was higher than 99%. It was noted that the flux in the case of low viscosity solvent as n-hexane was 9663.5 Lm−2 h−1, while for the viscous oil as diesel was 1452.7 Lm−2 h−1.

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Ma, Yanan, Jun Zhou, Lei Shu, Tianhua Li, Lucia Petti, and Pasquale Mormile. "Optimizing Au/Ag core–shell nanorods: purification, stability, and surface modification." Journal of Nanoparticle Research 16, no. 6 (May 15, 2014). http://dx.doi.org/10.1007/s11051-014-2439-6.

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Yudasari, Nurfina, I. Kadek H. Dinata, Cameron J. Shearer, Paula H. Blanco-Sanchez, Wildan P. Tresna Data, Isnaeni, Maria M. Suliyanti, and Herri Trilaksana. "Laser-assisted deposition of Ag on self-sourced growth ZnO nanorods as reusable photocatalysts for water purification." Inorganic Chemistry Communications, October 2022, 110065. http://dx.doi.org/10.1016/j.inoche.2022.110065.

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Santhanakrishnan, Harish, Navaneethan Mani, Archana Jayaram, Ponnusamy Suruttaiyaudiyar, Muthamizhchelvan Chellamuthu, and Masaru Shimomura. "Engineering of mono-dispersed mesoporous TiO2 over 1-D nanorods for water purification under visible light irradiation." Environmental Science and Pollution Research, September 14, 2020. http://dx.doi.org/10.1007/s11356-020-10547-z.

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Baqaei, Ali, Ali Asghar Sabbagh Alvani, and Hassan Sameie. "Enhancement of visible-light photo-activity of TiO₂ arrays for environmental water purification." Pigment & Resin Technology, July 29, 2022. http://dx.doi.org/10.1108/prt-04-2022-0041.

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Purpose Over the past decades, intense efforts have been devoted to design and synthesize efficient photocatalysts which are active under sunlight for environmental and energy applications. Titanium dioxide (TiO2) has attracted much attention over many years for organic contaminant degradation in air or water due to its strong optical absorptivity, chemical stability and low cost. However, TiO2 has a very low photo quantum yield which prompts the easy recombination of photogeneration electron/hole pairs. In addition, bandgap of 3.2 eV restrains application of this photocatalyst mainly to the UV range. Design/methodology/approach Vertically oriented one-dimensional TiO2 nanostructures remarkably improve electron transport by creating a direct conduction pathway, decreasing intercrystalline contacts and stretching grown structure with the specified directionality. In this research, to enhance the visible light absorbance of TiO2, prearranged hydrogenated titanium dioxide nanorods (H-TNRs) in the presence of H2/N2 gas flow are hydrothermally synthesized. Findings The X-ray diffraction patterns illustrated the characteristic peaks of tetragonal rutile TiO2 and confirmed that there is no phase change after hydrogenation. Trivalent titanium ions surface defects and oxygen vacancies were considered as major reasons for redshift of absorption edge toward visible region and subsequently narrowing the bandgap to 2.27 eV. The optimized photocatalysts exhibited high visible-light-driven photocatalytic activity for degradation of methylene blue in water within 210. The synthesized H-TNRs established themselves as promising photocatalysts for organic compounds degradation in the aqueous solution. Originality/value To the best of the authors’ knowledge, this work is original and has not been published elsewhere nor is it currently under consideration for publication elsewhere.

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Xiao, Yan, Yanlin Tao, Yinhua Jiang, Jun Wang, Wenli Zhang, Yan Liu, Jianming Zhang, Xiangyang Wu, and Zhanchao Liu. "Construction of core-shell CeO2 nanorods/SnIn4S8 nanosheets heterojunction with rapid spatial electronic migration for effective wastewater purification and H2O2 production." Separation and Purification Technology, October 2022, 122385. http://dx.doi.org/10.1016/j.seppur.2022.122385.

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Wen, Yingying, Juan Chen, Xin Gao, Wei Liu, Huinan Che, Bin Liu, and Yanhui Ao. "Two birds with one stone: Cobalt-doping induces to enhanced piezoelectric property and persulfate activation ability of ZnO nanorods for efficient water purification." Nano Energy, January 2023, 108173. http://dx.doi.org/10.1016/j.nanoen.2023.108173.

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Nasr-Esfahani, Masoud, Morteza Montazerozohori, and Tooba Abdizadeh. "Multi-component synthesis of highly substituted imidazoles catalyzed by nanorod vanadatesulfuric acid." Chemical Papers 69, no. 11 (January 1, 2015). http://dx.doi.org/10.1515/chempap-2015-0156.

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AbstractNanorod vanadatesulfuric acid (VSA NRs), as a recyclable and eco-benign catalyst, was used for one-pot synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstituted imidazoles using aldehydes, benzil, benzoin or 9,10-phenanthrenequinone and ammonium acetate or aniline under solvent-free conditions providing high to excellent yields. VSA is easily prepared by a simple reaction of chlorosulfonic acid and sodium metavanadate in high purity. As compared with the conventional procedures, the present protocol offers several advantages such as simplicity of procedure, short reaction time, high yields, easy workup, recoverability and reusability of the catalyst and simple purification of the products.

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Ai, Lunhong, Ying Xu, Shan Qin, Yang Luo, Wei Wei, Xinzhi Wang, and Jing Jiang. "Facile fabrication of Ni5P4-NiMoOx nanorod arrays with synergistic thermal management for efficient interfacial solar steam generation and water purification." Journal of Colloid and Interface Science, December 2022. http://dx.doi.org/10.1016/j.jcis.2022.12.016.

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