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Artículos de revistas sobre el tema "4-nitrophenol reduction"

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Autor: Grafiati
Publicado: 26 de junio de 2023

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1

Serrà, Albert, Raül Artal, Maria Pozo, Jaume Garcia-Amorós y Elvira Gómez. "Simple Environmentally-Friendly Reduction of 4-Nitrophenol". Catalysts 10, n.º 4 (23 de abril de 2020): 458. http://dx.doi.org/10.3390/catal10040458.

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The low molecular-mass organic compound 4-nitrophenol is involved in many chemical processes and is commonly present in soils and in surface and ground waters, thereby causing severe environmental impact and health risk. Several methods have been proposed for its transformation (bio and chemical degradation). However, these strategies not only produce equally or more toxic aromatic species but also require harsh operating conditions and/or time-consuming treatments. In this context, we report a comprehensive and systematic study of the electrochemical reduction of 4-nitrophenol as a viable alternative. We have explored the electrochemical reduction of this pollutant over different metallic and carbonaceous substrata. Specifically, we have focused on the use of gold and silver working electrodes since they combine a high electrocatalytic activity for 4-nitrophenol reduction and a low electrocatalytic capacity for hydrogen evolution. The influence of the pH, temperature, and applied potential have also been considered as crucial parameters in the overall optimization of the process. While acidic media and high temperatures favor the clean reduction of 4-nitrophenol to 4-aminophenol, the simultaneous hydrogen evolution is pernicious for this purpose. Herein, a simple and effective electrochemical method for the transformation of 4-nitrophenol into 4-aminophenol is proposed with virtually no undesired by-products.
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2

Chen, Jie, Rong Ji Dai, Bin Tong, Sheng Yuan Xiao y Weiwei Meng. "Reduction of 4-nitrophenol catalyzed by nitroreductase". Chinese Chemical Letters 18, n.º 1 (enero de 2007): 10–12. http://dx.doi.org/10.1016/j.cclet.2006.11.009.

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3

Konarev, A. A. "Electrochemical reduction of 4-chloro-2-nitrophenol". Russian Chemical Bulletin 72, n.º 2 (febrero de 2023): 500–506. http://dx.doi.org/10.1007/s11172-023-3813-4.

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4

Macho, Vendelín, Milan Kučera y Milan Králik. "Carbonylative Reduction of Nitrophenols to Aminophenols". Collection of Czechoslovak Chemical Communications 60, n.º 3 (1995): 514–20. http://dx.doi.org/10.1135/cccc19950514.

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Two- or three-component catalysts composed of (i) sulfur or sulfur compound (H2S, CS2, COS, Na2S), (ii) basic additive (triethylamine, CH3ONa, Na2S), and usually (iii) vanadium(V) compounds (e.g. NH4VO3) were found to catalyze efficiently the reaction of CO + H2O with isomeric nitrophenols to give the corresponding aminophenols. The reaction proceeds smoothly at 398 and 483 K and initial pressure of 7 MPa, and its rate increases from 2- to 4-nitrophenol. The selectivity to aminophenols exceeding 96 per cent was obtained at the water to nitrophenol molar ratio higher than 5. The solvents such as methanol and dioxane ensured better contact of the reactants, which was necessary for achievement of such a high selectivity. The effectiveness of the sulfur components (based on the S content) is expressed by the following sequence: S : CS2 : Na2S : H2 S : COS = 1 : 1.2 : 2.5 : 10 : 11. The reaction takes place also under the reduced CO pressure to 0.1 - 0.35 MPa. Formation of side products and mechanism of the reaction are discussed.
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5

Urkude, Kalyani, Sanjay R. Thakare y Sandeep Gawande. "An energy efficient photocatalytic reduction of 4-nitrophenol". Journal of Environmental Chemical Engineering 2, n.º 1 (marzo de 2014): 759–64. http://dx.doi.org/10.1016/j.jece.2013.11.019.

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6

Roy, Anindita, Biplab Debnath, Ramkrishna Sahoo, Teresa Aditya y Tarasankar Pal. "Micelle confined mechanistic pathway for 4-nitrophenol reduction". Journal of Colloid and Interface Science 493 (mayo de 2017): 288–94. http://dx.doi.org/10.1016/j.jcis.2017.01.045.

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7

Sree, Vijaya Gopalan, Jung Inn Sohn y Hyunsik Im. "Pre-Anodized Graphite Pencil Electrode Coated with a Poly(Thionine) Film for Simultaneous Sensing of 3-Nitrophenol and 4-Nitrophenol in Environmental Water Samples". Sensors 22, n.º 3 (2 de febrero de 2022): 1151. http://dx.doi.org/10.3390/s22031151.

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A very simple, as well as sensitive and selective, sensing protocol was developed on a pre-anodized graphite pencil electrode surface coated using poly(thionine) (APGE/PTH). The poly(thionine) coated graphite pencil was then used for simultaneous sensing of 3-nitrophenol (3-NP) and 4-nitrophenol (4-NP). The poly(thionine) coated electrode exhibited an enhanced electrocatalytic property towards nitrophenol (3-NP and 4-NP) reduction. Redox peak potential and current of both nitrophenols were found well resolved and their simultaneous analysis was studied. Under optimized experimental conditions, APGE/PTH showed a long linear concentration range from 20 to 230 nM and 15 nM to 280 nM with a calculated limit of detection (LOD) of 4.5 and 4 nM and a sensitivity of 22.45 µA/nM and 27.12 µA/nM for 3-NP and 4-NP, respectively. Real sample analysis using the prepared sensor was tested with different environmental water samples and the sensors exhibited excellent recovery results in the range from 98.16 to 103.43%. Finally, the sensor exposed an promising selectivity, stability, and reproducibility towards sensing of 3-NP and 4-NP.
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8

Le, Van Thuan, Ngoc Nhu Quynh Ngu, Tan Phat Chau, Thi Dung Nguyen, Van Toan Nguyen, Thi Lan Huong Nguyen, Xuan Thang Cao y Van-Dat Doan. "Silver and Gold Nanoparticles from Limnophila rugosa Leaves: Biosynthesis, Characterization, and Catalytic Activity in Reduction of Nitrophenols". Journal of Nanomaterials 2021 (20 de mayo de 2021): 1–11. http://dx.doi.org/10.1155/2021/5571663.

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This study describes a simple green method for the synthesis of Limnophila rugosa leaf-extract-capped silver and gold nanoparticles without using any expensive toxic reductant or stabilizer. The noble metal nanoparticles were characterized by Fourier transform infrared (FTIR) microscopy, powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray analysis (EDX), high-resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and dynamic light scattering (DLS) method. It has been found that the biosynthesized silver and gold nanoparticles are nearly spherical in shape with a mean particle size distribution of 87.5 nm and 122.8 nm, respectively. XRD and SAED patterns confirmed the crystalline nanostructure of the metal nanoparticles. FTIR spectra revealed the functional groups of biomolecules presented in the extract possibly responsible for reducing metallic ions and stabilizing formed nanoparticles. The biosynthesized metal nanoparticles have potential application in catalysis. Compared to previous reports, Limnophila rugosa leaf-extract-capped silver and gold nanoparticles exhibited a good catalytic activity in the reduction of several derivatives of nitrophenols including 1,4-dinitrobenzene, 2-nitrophenol, 3-nitrophenol, and 4-nitrophenol.
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9

Zhang, Qi, Xinfei Fan, Hua Wang, Shuo Chen y Xie Quan. "Fabrication of Au/CNT hollow fiber membrane for 4-nitrophenol reduction". RSC Advances 6, n.º 47 (2016): 41114–21. http://dx.doi.org/10.1039/c6ra07705f.

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10

Yudha S, Salprima, Aswin Falahudin, Risky Hadi Wibowo, John Hendri y Dennie Oktrin Wicaksono. "Reduction of 4-nitrophenol Mediated by Silver Nanoparticles Synthesized using Aqueous Leaf Extract of Peronema canescens". Bulletin of Chemical Reaction Engineering & Catalysis 16, n.º 2 (19 de abril de 2021): 253–59. http://dx.doi.org/10.9767/bcrec.16.2.10426.253-259.

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In this study, we developed an alternative of 4-nitrophenol reduction mediated by silver nanoparticles (AgNPs) which was synthesized using aqueous extract of the Peronema canescens leaf through an eco-friendly approach. The reducing 4-nitrophenol to 4-aminophenol mediated by AgNPS in the presence of sodium borohydride as a hydrogen source proceeded rapidly at room temperature without any additional treatments. The AgNPS synthesis was simple and was carried out under mild conditions. Ultraviolet–visible spectroscopy was performed to examine the properties of the obtained AgNPs, which displayed an absorption peak at 431 nm. A transmission electron microscopy analysis revealed that the AgNPs were spherical in shape and had an average particle size of 19 nm as determined by particle size analysis. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
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11

Mejía, Yetzin Rodriguez y Naveen Kumar Reddy Bogireddy. "Reduction of 4-nitrophenol using green-fabricated metal nanoparticles". RSC Advances 12, n.º 29 (2022): 18661–75. http://dx.doi.org/10.1039/d2ra02663e.

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Noble metal (silver (Ag), gold (Au), platinum (Pt), and palladium (Pd)) nanoparticles have gained increasing attention due to their importance in several research fields such as environmental and medical research.
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12

Cui, Yanshuai, Bo Liang, Jin Zhang, Ran Wang, Haotian Sun, Longgang Wang y Dawei Gao. "Polyethyleneimine-stabilized palladium nanoparticles for reduction of 4-nitrophenol". Transition Metal Chemistry 44, n.º 7 (15 de mayo de 2019): 655–62. http://dx.doi.org/10.1007/s11243-019-00330-6.

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13

Jadbabaei, Nastaran, Ryan James Slobodjian, Danmeng Shuai y Huichun Zhang. "Catalytic reduction of 4-nitrophenol by palladium-resin composites". Applied Catalysis A: General 543 (agosto de 2017): 209–17. http://dx.doi.org/10.1016/j.apcata.2017.06.023.

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14

Saha, Anushree, Ramsingh Kurrey, Santosh Kumar Verma y Manas Kanti Deb. "Cationic Polystyrene Resin Bound Silver Nanocomposites Assisted Fourier Transform Infrared Spectroscopy for Enhanced Catalytic Reduction of 4-Nitrophenol in Aqueous Medium". Chemistry 4, n.º 4 (16 de diciembre de 2022): 1757–74. http://dx.doi.org/10.3390/chemistry4040114.

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The present work reported a novel strategy to construct supported cationic-polystyrene-resin-bound silver nanocomposites for enhanced catalytic reduction of 4-nitrophenol in an aqueous medium. The Fourier transform infrared spectroscopy (FTIR) was used as a model instrument for the study of catalytic reduction of 4-nitrophenol using cationic-polystyrene-resin-bound silver nanocomposite materials. The mechanism is based on the reduction of 4-nitrophenol to 4-aminophenol due to the electron transfer process that occurred between donor borohydride (BH4−) and acceptor 4-nitrophenol. The polystyrene resin provides support and surface area to increase the catalytic activity of silver nanoparticles. The diffused reflectance-Fourier transform infrared spectroscopy revealed the binding of silver particles onto the surface of cationic polystyrene resin beads. Furthermore, the catalyst was easily separated by the filtration and drying process and was able to reuse. A quantitative analysis of this work has also been performed. The linearity range, the limit of detection, and the limit of quantification obtained for the present method were 0.1 × 10−4 to 1.0 M, 0.6 M, and 2.1 M, respectively. Moreover, a good catalytic efficiency was found to be 96.8%. The advantages of the current method are its simplicity, sensitivity, rapidity, low cost, ease of preparation, and excellent catalytic efficiency to reduce 4-nitrophenol from an aqueous solution.
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15

Khani, Milad, Ramaswami Sammynaiken y Lee Wilson. "Electrocatalytic Oxidation of Nitrophenols via Ag Nanoparticles Supported on Citric-Acid-Modified Polyaniline". Catalysts 13, n.º 3 (22 de febrero de 2023): 465. http://dx.doi.org/10.3390/catal13030465.

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Citric-acid-modified polyaniline (P-CA) and P-CA modified with Ag nanoparticles (Ag@P-CA) were prepared via an in situ reduction method. The physicochemical properties of P-CA and Ag@P-CA were compared to unmodified polyaniline (PANI) and PANI-modified Ag nanoparticles (Ag@PANI). Ag@P-CA had a lower content of aniline oligomers compared to Ag@PANI. P-CA and Ag@P-CA had a greater monolayer adsorption capacity for 2-nitrophenol and lower binding affinity as compared to PANI and Ag@PANI materials. X-ray photoelectron spectroscopy and cyclic voltammetry characterization provided reason and evidence for the higher conductivity of citric-acid-modified materials (P-CA and Ag@P-CA versus PANI and Ag@PANI). These results showed the potential utility for the optimization of adsorption/desorption and electron transfer steps during the electrochemical oxidation of nitrophenols. The oxidation process employs Ag@P-CA as the electrocatalyst by modifying polyaniline with Ag nanoparticles and citric acid, which was successfully employed to oxidize 2-nitrophenol and 4-nitrophenol with comparable selectivity and sensitivity to their relative concentrations. This work is envisaged to contribute significantly to the selective conversion of nitrophenols and electrocatalytic remediation of such waterborne contaminants.
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16

Mojović, Zorica, Srđan Petrović y Ljiljana Rožić. "The role of ruthenium in perovskite-type mixed oxide in the electrochemical degradation of 4-nitrophenol". Tehnika 75, n.º 6 (2020): 695–99. http://dx.doi.org/10.5937/tehnika2006695m.

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In this paper new perovskite-based electrode materials for 4-nitrophenol detection were characterized. Mixed oxides of pereovskite type with general molecular formula La0.7Sr0.3Cr1-XRuX03 (X= 0; 0.05) were synthesized by ceramic procedure. The results of X-ray diffraction analysis showed that synthesized system has two-phase structure, including strontium chromate phase beside dominant perovskite phase. Carbon paste electrode was modified with synthsized perovskites in order to study their electrochemical activity. Electrode prepared innn such manner were used for oxido-reduction of 4-nitrophenol in acidic media. The addition of ruthenium to perovskite structure lead to increased electrochemical activity of this electrode for reduction of 4-nitrophenol.
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17

Yang, Desheng, Rui Zhang, Ting Zhao, Tingting Sun, Xiaomeng Chu, Shaojie Liu, Erjun Tang y Xiaodong Xu. "Efficient reduction of 4-nitrophenol catalyzed by 4-carbo-methoxypyrrolidone modified PAMAM dendrimer–silver nanocomposites". Catalysis Science & Technology 9, n.º 21 (2019): 6145–51. http://dx.doi.org/10.1039/c9cy01655d.

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18

Cao, Xinjiang, Shancheng Yan, Feihu Hu, Junhua Wang, Yiming Wan, Bo Sun y Zhongdang Xiao. "Reduced graphene oxide/gold nanoparticle aerogel for catalytic reduction of 4-nitrophenol". RSC Advances 6, n.º 68 (2016): 64028–38. http://dx.doi.org/10.1039/c6ra09386h.

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19

Iben Ayad, Anas, Denis Luart, Aissa Ould Dris y Erwann Guénin. "Kinetic Analysis of 4-Nitrophenol Reduction by “Water-Soluble” Palladium Nanoparticles". Nanomaterials 10, n.º 6 (15 de junio de 2020): 1169. http://dx.doi.org/10.3390/nano10061169.

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The most important model catalytic reaction to test the catalytic activity of metal nanoparticles is the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride as it can be precisely monitored by UV–vis spectroscopy with high accuracy. This work presents the catalytic reduction of 4-nitrophenol (4-Nip) to 4-aminophenol (4-Amp) in the presence of Pd nanoparticles and sodium borohydride as reductants in water. We first evaluate the kinetics using classical pseudo first-order kinetics. We report the effects of different initial 4-Nip and NaBH4 concentrations, reaction temperatures, and mass of Pd nanoparticles used for catalytic reduction. The thermodynamic parameters (activation energy, enthalpy, and entropy) were also determined. Results show that the kinetics are highly dependent on the reactant ratio and that pseudo first-order simplification is not always fit to describe the kinetics of the reaction. Assuming that all steps of this reaction proceed only on the surface of Pd nanoparticles, we applied a Langmuir−Hinshelwood model to describe the kinetics of the reaction. Experimental data of the decay rate of 4-nitrophenol were successfully fitted to the theoretical values obtained from the Langmuir–Hinshelwood model and all thermodynamic parameters, the true rate constant k, as well as the adsorption constants of 4-Nip, and BH4− (K4-Nip and KBH4−) were determined for each temperature.
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20

Wang, Kun, Xun Zhu, Yang Yang, Dingding Ye, Rong Chen y Qiang Liao. "Photothermal reduction of 4-nitrophenol to 4-aminophenol using silver/polydopamine catalysts". Journal of Environmental Chemical Engineering 10, n.º 5 (octubre de 2022): 108253. http://dx.doi.org/10.1016/j.jece.2022.108253.

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21

Bui Thi Thanh, Ha, Duong Le Van, Hung Ta Ngoc, Hai Dinh Thi Thanh, Duong Pham Dai, Anh Nguyen Le y Don Ta Ngoc. "Reduction of 4-nitrophenol to 4-aminophenol using Pt/HKUST-1 catalyst". Vietnam Journal of Catalysis and Adsorption 11, n.º 1 (2 de octubre de 2021): 110–16. http://dx.doi.org/10.51316/jca.2022.017.

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The catalyst Pt/HKHUST-1 was used for synthesis 4-aminophenol (4-AP) by reducsion 4-nitrophenol (4-NP). Factors that affected to the reaction were tested: ratio 4-NP/NaBH4, temperature and time of the reaction. Changing the ratio of 4-NP/NaBH4 in the direction of increasing NaBH4, the reaction rate increases. However, it is acceptable to reduce the reaction rate when synthesizing with high concentration of reactants. The 4-AP synthesis is performed with ratio 4-NP/NaBH4 = 1/5, suitable time and temperature for this reaction is 60 minutes and 15 oC. The catalyst sample containing 2% Pt on HKUST-1 material was used to synthesize 4-AP with the yield of 65.3% (average 64.2%), the catalyst has good stability, can reused many times. The purity of 4-AP after refining was 99 %.
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22

Kong, Xiangkai, Hongying Zhu, ChangLe Chen, Guangming Huang y Qianwang Chen. "Insights into the reduction of 4-nitrophenol to 4-aminophenol on catalysts". Chemical Physics Letters 684 (septiembre de 2017): 148–52. http://dx.doi.org/10.1016/j.cplett.2017.06.049.

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23

Çıplak, Zafer, Ceren Gökalp, Bengü Getiren, Atila Yıldız y Nuray Yıldız. "Catalytic performance of Ag, Au and Ag-Au nanoparticles synthesized by lichen extract". Green Processing and Synthesis 7, n.º 5 (25 de octubre de 2018): 433–40. http://dx.doi.org/10.1515/gps-2017-0074.

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Abstract In the present study, the green chemistry approach for the biosynthesis of Ag, Au and Ag-Au bimetallic nanoparticles (NPs) was applied using lichen extract [Cetraria islandica (L.) Ach.]. The lichen extract acts both as a reducing and stabilizing agent. The monometallic and bimetallic NPs were characterized by transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The results showed that NPs were successfully synthesized and the prepared structures were generally spherical. The synthesized nanostructures exhibited excellent catalytic activities towards reduction of nitrophenols (4-nitrophenol; 4-NP) to aminophenols (4-aminophenol; 4-AP) with sodium borohydride (NaBH4). It was determined that bimetallic NPs exhibit more effective catalytic activity than monometallic Ag and Au nanostructures. This is the first report on 4-NP reduction with Ag, Au and Au-Ag NP catalysts prepared by lichen extract.
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24

Huang, Deshun, Guiying Yang, Xingwen Feng, Xinchun Lai y Pengxiang Zhao. "Triazole-stabilized gold and related noble metal nanoparticles for 4-nitrophenol reduction". New Journal of Chemistry 39, n.º 6 (2015): 4685–94. http://dx.doi.org/10.1039/c5nj00673b.

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25

Abebe, Buzuayehu, Bontu Kefale y Dereje Tsegaye Leku. "Synthesis of copper–silver–zinc oxide nanocomposites for 4-nitrophenol reduction: doping and heterojunction". RSC Advances 13, n.º 7 (2023): 4523–29. http://dx.doi.org/10.1039/d2ra07845g.

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26

R, Madhushree, Jadan Resnik Jaleel UC, Dephan Pinheiro y Sunaja Devi KR. "The catalytic reduction of 4-nitrophenol using MoS2/ZnO nanocomposite". Applied Surface Science Advances 10 (agosto de 2022): 100265. http://dx.doi.org/10.1016/j.apsadv.2022.100265.

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27

Shivhare, Atal, Stephen J. Ambrose, Haixia Zhang, Randy W. Purves y Robert W. J. Scott. "Stable and recyclable Au25clusters for the reduction of 4-nitrophenol". Chem. Commun. 49, n.º 3 (2013): 276–78. http://dx.doi.org/10.1039/c2cc37205c.

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28

Chang, Yang-Chuang y Dong-Hwang Chen. "Catalytic reduction of 4-nitrophenol by magnetically recoverable Au nanocatalyst". Journal of Hazardous Materials 165, n.º 1-3 (15 de junio de 2009): 664–69. http://dx.doi.org/10.1016/j.jhazmat.2008.10.034.

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29

Deka, Pangkita, Ramesh C. Deka y Pankaj Bharali. "In situ generated copper nanoparticle catalyzed reduction of 4-nitrophenol". New Journal of Chemistry 38, n.º 4 (2014): 1789. http://dx.doi.org/10.1039/c3nj01589k.

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30

Yang, Tongyu, Yakun Tang, Lang Liu, Yang Gao y Yang Zhang. "Cu-anchored CNTs for effectively catalytic reduction of 4-nitrophenol". Chemical Physics 533 (mayo de 2020): 110738. http://dx.doi.org/10.1016/j.chemphys.2020.110738.

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31

Zheng, Yian, Yongfeng Zhu y Aiqin Wang. "Evolution of Fe3+-hydrogel for catalytic reduction of 4-nitrophenol". Colloid and Polymer Science 293, n.º 7 (17 de abril de 2015): 2009–16. http://dx.doi.org/10.1007/s00396-015-3587-7.

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32

Noël, Sébastien, Hervé Bricout, Ahmed Addad, Christian Sonnendecker, Wolfgang Zimmermann, Eric Monflier y Bastien Léger. "Catalytic reduction of 4-nitrophenol with gold nanoparticles stabilized by large-ring cyclodextrins". New Journal of Chemistry 44, n.º 48 (2020): 21007–11. http://dx.doi.org/10.1039/d0nj03687k.

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33

Ma, Bing, Man Wang, Di Tian, Yanyan Pei y Liangjie Yuan. "Micro/nano-structured polyaniline/silver catalyzed borohydride reduction of 4-nitrophenol". RSC Advances 5, n.º 52 (2015): 41639–45. http://dx.doi.org/10.1039/c5ra05396j.

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Micro/nano-structured polyaniline/Ag composites with different morphologies were prepared. The composites were applied as a catalyst in the borohydride reduction reaction of 4-nitrophenol and showed comparable catalytic performance.
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34

Gadgil, Bhushan, Pia Damlin, Antti Viinikanoja, Markku Heinonen y Carita Kvarnström. "One-pot synthesis of an Au/Au2S viologen hybrid nanocomposite for efficient catalytic applications". Journal of Materials Chemistry A 3, n.º 18 (2015): 9731–37. http://dx.doi.org/10.1039/c5ta01372k.

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35

Zhou, Wei, Yi Zhou, Yu Liang, Xiaohui Feng y Hong Zhou. "Silver nanoparticles on carboxyl-functionalized Fe3O4 with high catalytic activity for 4-nitrophenol reduction". RSC Advances 5, n.º 62 (2015): 50505–11. http://dx.doi.org/10.1039/c5ra04647e.

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36

Lin, Shali, Xiaohu Mi, Lei Xi, Jinping Li, Lei Yan, Zhengkun Fu y Hairong Zheng. "Efficient Reduction Photocatalyst of 4-Nitrophenol Based on Ag-Nanoparticles-Doped Porous ZnO Heterostructure". Nanomaterials 12, n.º 16 (19 de agosto de 2022): 2863. http://dx.doi.org/10.3390/nano12162863.

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Oxide-supported Ag nanoparticles have been widely reported as a good approach to improve the stability and reduce the cost of photocatalysts. In this work, a Ag-nanoparticles-doped porous ZnO photocatalyst was prepared by using metal–organic frameworks as a sacrificial precursor and the catalytic activity over 4-nitrophenol was determined. The Ag-nanoparticles-doped porous ZnO heterostructure was evaluated by UV, XRD, and FETEM, and the catalytic rate constant was calculated by the change in absorbance value at 400 nm of 4-nitrophenol. The photocatalyst with a heterogeneous structure is visible, light-responsive, and beneficial to accelerating the catalytic rate. Under visible light irradiation, the heterostructure showed excellent catalytic activity over 4-nitrophenol due to the hot electrons induced by the localized surface plasmon resonance of Ag nanoparticles. Additionally, the catalytic rates of 4 nm/30 nm Ag nanoparticles and porous/nonporous ZnO were compared. We found that the as-prepared Ag-nanoparticles-doped porous ZnO heterostructure catalyst showed enhanced catalytic performance due to the synergetic effect of Ag nanoparticles and porous ZnO. This study provides a novel heterostructure photocatalyst with potential applications in solar energy and pollutant disposal.
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37

Panda, Jagannath, Soumya Prakash Biswal, Himanshu Sekhar Jena, Arijit Mitra, Raghabendra Samantray y Rojalin Sahu. "Role of Lewis Acid Metal Centers in Metal–Organic Frameworks for Ultrafast Reduction of 4-Nitrophenol". Catalysts 12, n.º 5 (29 de abril de 2022): 494. http://dx.doi.org/10.3390/catal12050494.

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Metal–Organic Frameworks (MOFs) can be a good alternative to conventional catalysts because they are non-toxic and can be selective without compromising efficiency. Nano MOFs such as UiO-66 have proven themselves to be competitive in the catalytic family. In this study, we report the excellent catalytic behavior of UiO-66 MOF in the reduction of a model reaction: 4-Nitrophenol (4-NP) to 4-Aminophenol (4-AP) over MOF-5 (Zn-BDC) and MIL-101 (Fe-BDC). Nano UiO-66 crystals were synthesized by a hydrothermal process and characterized by Powder X-ray Diffraction, Diffused Reflectance UV-Vis spectroscopy, Scanning Electron Microscopy, and Transmission Electron Microscopy. The catalysts’ performance during the hydrogenation reduction reaction from 4-NP to 4-AP was investigated in the presence of a reducer, NaBH4. The UiO-66 nano crystals exhibited excellent catalytic behavior owing to its large surface area and Lewis acidic nature at the metal nodes. Furthermore, UiO-66 showed excellent recyclability behavior, verified during repeated consecutive use in a sequence. The catalyst yielded similar catalytic behavior during the reduction of nitrophenols at each cycle, which is a novel finding.
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38

Hou, Chen, Dongyan Zhao, Wenqiang Chen, Hao Li, Sufeng Zhang y Chen Liang. "Covalent Organic Framework-Functionalized Magnetic CuFe2O4/Ag Nanoparticles for the Reduction of 4-Nitrophenol". Nanomaterials 10, n.º 3 (28 de febrero de 2020): 426. http://dx.doi.org/10.3390/nano10030426.

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In this work, magnetic CuFe2O4/Ag nanoparticles activated by porous covalent organic frameworks (COF) was fabricated to evaluate the heterogenous reduction of 4-nitrophenol (4-NP). The core-shell CuFe2O4/Ag@COF was successfully prepared by polydopamine reduction of silver ions on CuFe2O4 nanoparticles, followed by COF layer condensation. By integrating the intrinsic characteristics of the magnetic CuFe2O4/Ag core and COF layer, the obtained nanocomposite exhibited features of high specific surface area (464.21 m2 g−1), ordered mesoporous structure, strong environment stability, as well as fast magnetic response. Accordingly, the CuFe2O4/Ag@COF catalyst showed good affinity towards 4-NP via π-π stacking interactions and possessed enhanced catalytic activity compared with CuFe2O4/Ag and CuFe2O4@COF. The pseudo-first-order rate constant of CuFe2O4/Ag@COF (0.77 min−1) is 3 and 5 times higher than CuFe2O4/Ag and CuFe2O4@COF, respectively. The characteristics of bi-catalytic CuFe2O4/Ag and the porous COF shell of CuFe2O4/Ag@COF made a contribution to improve the activity of 4-NP reduction. The present work demonstrated a facile strategy to fabricate COF-activated nano-catalysts with enhanced performance in the fields of nitrophenolic wastewater treatment.
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39

Deng, Liujun, Yu Zou y Jiang Jiang. "Plasmonic MoO2 embedded MoNi4 nanosheets prepared by NiMoO4 transformation for visible-light-enhanced 4-nitrophenol reduction". Dalton Transactions 50, n.º 46 (2021): 17235–40. http://dx.doi.org/10.1039/d1dt03216j.

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40

Haddad, Reza y Ali Roostaie. "Nano-Polyoxotungstate [Cu20P8W48] Immobilized on Magnetic Nanoparticles as an Excellent Heterogeneous Catalyst Nanoreactors for Green Reduction of Nitrophenol Compounds". Journal of Spectroscopy 2022 (26 de mayo de 2022): 1–11. http://dx.doi.org/10.1155/2022/7019037.

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In this study, Cu20-polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25− supported on a magnetic substrate was used as a high-performance green method for the reduction of nitrophenol compounds such as 4-nitrophenol (4-NP) and 2,4,6-trinitrophenol (2,4,6-TNP). [Fe3O4@SiO2-NH2-Cu20P8W48] as heterogeneous magnetic nanocatalyst was synthesized and characterized by FT-IR, SEM, TEM, VSM, and TGA. This nanocatalyst has an excellent efficiency in the reduction of nitrophenol compounds to aminophenol compounds. The UV-Vis absorption spectrum is used at different times to evaluate the progress of the reaction. Under optimal conditions, 100% conversion and selectivity in reduction of 4-NP and 2,4,6-TNP to 4-AP and 2,4,6-TAP were obtained, respectively. In addition, after the reaction, the [Fe3O4@SiO2-NH2-Cu20P8W48] was recovered using an external magnetic field and used for the next cycle. The results showed that the nanocatalyst can perform eight consecutive cycles without any significant decrease in efficiency. In the end, according to the results, the proposed mechanism for this reaction was reported.
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41

Krämer, Petra M., Qing X. Li y Bruce D. Hammock. "Integration of Liquid Chromatography with Immunoassay: An Approach Combining the Strengths of Both Methods". Journal of AOAC INTERNATIONAL 77, n.º 5 (1 de septiembre de 1994): 1275–87. http://dx.doi.org/10.1093/jaoac/77.5.1275.

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Abstract The integration of liquid chromatography (LC) with immunochemical detection combines the superior separation power of LC and the sensitivity and specificity of immunoassays. This approach is shown with 3 LC systems (Perkin-Elmer, C18 RP, 4.6 mm; Varian, C18 RP, 1 mm microbore; Michrom, C18 RP, 1 mm microbore) Integrated with an enzyme-linked immunosorbent assay (ELISA) selective for five 4-nitrophenols. The nitrophenols were separated with the 3 LC systems with isocratic runs of 15 to 20 min. Microbore LC separation showed a 10-20 times reduction in solvent amount compared to conventional separation. LC–immunoassay was about 8- to 10-fold more sensitive compared with LC with UV detection. Integrated LC–immunoassay proved to be a very selective method when 2-methylphenol was injected with an equimolar mixture of 2-amino-4-nitrophenol and 3-methyl-4-nrtrophenol; 2-methy I phenol does not crossreact with the serum used. Only 2 peaks could be seen in the detection, even when 2-methylphenol was present in very high amounts (3000 pmol). Further, the EUSA-LC detection proved to be selective and sensitive for complex matrixes. 2-Amlno-4-nitrophenol was clearly identified in spiked extracts of soil and plant, even when a very small amount (2.4 ng) was injected. Although LC–immunoassay is more labor intensive than LC with UV detection, it offers great advantages in multiresidue analysis and is generally applicable for peak confirmation.
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42

Jia, Wei-Guo, Yuan-Chen Dai, Hai-Ning Zhang, Xiaojing Lu y En-Hong Sheng. "Synthesis and characterization of gold complexes with pyridine-based SNS ligands and as homogeneous catalysts for reduction of 4-nitrophenol". RSC Advances 5, n.º 37 (2015): 29491–96. http://dx.doi.org/10.1039/c5ra01749a.

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43

Larm, Nathaniel E., Jason A. Thon, Yahor Vazmitsel, Jerry L. Atwood y Gary A. Baker. "Borohydride stabilized gold–silver bimetallic nanocatalysts for highly efficient 4-nitrophenol reduction". Nanoscale Advances 1, n.º 12 (2019): 4665–68. http://dx.doi.org/10.1039/c9na00645a.

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Bimetallic AuxAg1−x nanoparticles, prepared using sodium borohydride as the sole reducing and capping agent for various NaBH4:metal molar ratios, were investigated as catalysts for 4-nitrophenol reduction.
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44

Kaur, Jaspreet, Khushwinder Kaur, Surinder K. Mehta y Avtar S. Matharu. "A novel molybdenum oxide–Starbon catalyst for wastewater remediation". Journal of Materials Chemistry A 8, n.º 29 (2020): 14519–27. http://dx.doi.org/10.1039/d0ta05388k.

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45

Chatterjee, Sujit, Malay Chakraborty, Kamal Kanti Bera, Ankita Mahajan, Senjuti Banik, Partha Sarathi Roy y Swapan Kumar Bhattacharya. "Catalytic reduction of 4-nitrophenol to 4-aminophenol using an efficient Pd nanoparticles". IOP Conference Series: Materials Science and Engineering 1080, n.º 1 (1 de febrero de 2021): 012010. http://dx.doi.org/10.1088/1757-899x/1080/1/012010.

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46

Liu, Peng y Mingfei Zhao. "Silver nanoparticle supported on halloysite nanotubes catalyzed reduction of 4-nitrophenol (4-NP)". Applied Surface Science 255, n.º 7 (enero de 2009): 3989–93. http://dx.doi.org/10.1016/j.apsusc.2008.10.094.

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47

Kuroda, Kyoko, Tamao Ishida y Masatake Haruta. "Reduction of 4-nitrophenol to 4-aminophenol over Au nanoparticles deposited on PMMA". Journal of Molecular Catalysis A: Chemical 298, n.º 1-2 (febrero de 2009): 7–11. http://dx.doi.org/10.1016/j.molcata.2008.09.009.

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48

Lee, Hye-Rim, Jung Hyun Park, Faizan Raza, DaBin Yim, Su-Ji Jeon, Hye-In Kim, Ki Wan Bong y Jong-Ho Kim. "Photoactive WS2 nanosheets bearing plasmonic nanoparticles for visible light-driven reduction of nitrophenol". Chemical Communications 52, n.º 36 (2016): 6150–53. http://dx.doi.org/10.1039/c6cc00708b.

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49

Hu, Huawen, Xiaowen Wang, Dagang Miao, Yuanfeng Wang, Chuilin Lai, Yujuan Guo, Wenyi Wang, John H. Xin y Hong Hu. "A pH-mediated enhancement of the graphene carbocatalyst activity for the reduction of 4-nitrophenol". Chemical Communications 51, n.º 93 (2015): 16699–702. http://dx.doi.org/10.1039/c5cc05826k.

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50

Veerakumar, Pitchaimani, Rajesh Madhu, Shen-Ming Chen, Vediyappan Veeramani, Chin-Te Hung, Pi-Hsi Tang, Chen-Bin Wang y Shang-Bin Liu. "Highly stable and active palladium nanoparticles supported on porous carbon for practical catalytic applications". J. Mater. Chem. A 2, n.º 38 (2014): 16015–22. http://dx.doi.org/10.1039/c4ta03097d.

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