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Journal of Environmental Sciences 2020年第6期32卷 1-10页

作者： Ningning Wang Shuai Zeng Hong Yuan Jin Huang Key Laboratory of pesticide and Chemical Biology of Ministry of Education College of ChemistryCentral China Normal UniversityWuhan 430079China Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China

In this work,we fabricated three kinds of Ag/Fe2O3 model catalysts with different morphologies to study the interfacial interactions between Ag and Fe2O3,and how they affected the catalytic activity in hydrogenation of p-nitrophenol was explored.The hydrothermal method was used to synthesize the metal oxide supported silver catalyst,with various morphologies including nanoplates(Nps),nanospheres(NSs),and nanocubes(NCs).The crystal structure,morphology and surface elements of the composite were investigated by various measurements,such as X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XpS).The catalytic activity was also evaluated by the reduction of p-nitrophenol to p-aminophenol.It was found that the activities of the above catalysts varied with the morphology of the support.Among them,Ag/Fe2O3 Nps promoted the highest performance,Ag/Fe2O3 NSs were slightly inferior,and Ag/Fe2O3 NCs were the worst.At last,we ascribed the remarkable activity of Ag/Fe2O3 Nps to the strong metal-support interactions between Ag and Fe2O3.

关键词： Ag/Fe2O3 Interfacial interaction Catalytic activity p-nitrophenol Morphology dependence

Effects of metal cations on sorption-desorption of p-nitrophenol onto wheat ash

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Journal of Environmental Sciences 2011年第1期23卷 112-118页

作者： YushengWang Zhiguo pei Xiaoquan Shan Guangcai Chen Jing Zhang Yaning Xie Lirong Zheng State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Beijing 100085 China Research Institute of Subtropical Forestry Chinese Academy of Forestry Fuyang 311400 China Synchrotron Radiation Laboratory Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

The mutual effects of metal cations （Cu2＋, pb2＋, Zn2＋, and Cd2＋） and p-nitrophenol （Np） on their adsorption desorption behavior onto wheat ash were studied. Results suggested that Cu2＋, pb2＋, and Zn2＋ diminished the adsorption and increased the desorption of Np remarkably, while Cd2＋ had no such effect. In contrast, Np diminished the adsorption of Cu2＋, pb2＋, and Zn2＋ onto ash, however, this suppression effect depended on the initial concentrations of metal cations. Np had no effect on Cd〉 adsorption on ash. Fourier transform infrared （FT-IR） and X-ray absorption spectroscopic （XAS） studies suggested the following mechanisms responsible for the metal suppression effect on Np adsorption：（1） large hydrated Cu2＋, pb2＋, and Zn〉 shells occupied the surface of ash and prevent nonspecific adsorption of Np onto ash surface; （2） Cu2＋, pb2＋, and Zn2＋ may block the micropores of ash, resulting in decreased adsorption of Np; （3） cornplexation of Cu2＋, pb2＋, and Zn2＋ was likely via carboxyl, hydroxylic and phenolic groups of wheat ash and these same groups may also react with Np during adsorption. As a ＂soft acid＂, Cd2＋ is less efficient in the complexation of oxygencontaining acid groups than Cu2＋, pb2＋, and Zn2＋. Thus, Cd2＋ had no effect on the adsorption of Np on wheat ash.

关键词： metal cations p-nitrophenol adsorption desorption wheat ash FT-IR XAS

Impacts of wastewater sludge amendments in restoring nitrogen cycle in p-nitrophenol contaminated soil

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Journal of Environmental Sciences 2011年第4期23卷 616-623页

作者： F. Olcay Topac Sagban Department of Environmental Engineering Uludag University

The possible impacts on nitrogen-cycle in a p-nitrophenol （pNp） polluted soil and the effectiveness of wastewater sludge amendments in restoring nitrification potential and urease activity were evaluated by an incubation study. The results indicated that pNp at 250 mg/kg soil inhibited urease activity, nitrification potential, arginine ammonification rate and heterotrophic bacteria counts to some extents. After exposure to pNp, the nitrification potential of the tested soil was dramatically reduced to zero over a period of 30 days. Based on the findings, nitrification potential was postulated as a simple biochemical indicator for pNp pollution in soils. Nitrogen-cycling processes in soils responded positively to the applications of wastewater sludges. A sludge application rate of 200 tons/ha was sufficient for successful biostimulation of these nitrogen processes. The microbial activities in sludge-amended, heavy pNp-polluted soils seemed to recover after 30–45 days, indicating the effectiveness of sludge as a useful soil amendment.

关键词： p-nitrophenol wastewater sludge soil pollution nitrogen-cycle biostimulation

Layered CuNi-Cu_(2)O/NiAlO_(x) nanocatalyst for rapid conversion of p-nitrophenol to p-aminophenol

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Nano Research 2021年第12期14卷 4616-4624页

作者： Lin Fu Wei Zhou Ming Wen Qingsheng Wu Weiying Li Dandan Wu Quanjing Zhu Jiaqi Ran panpan Ren School of Chemical Science and Engineering College of Environmental Science and EngineeringKey Laboratory of Yangtze River Water EnvironmentMinistry of EducationShanghai Key Laboratory of Chemical Assessment and SustainabilityTongji UniversityShanghai200092China School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai201418China

In order to well arrange active sites and avoid byproducts, the reasonable structured carrier nanocatalyst plays a crucial role in high catalytic performance, but still remains a challenge. Herein, the layered CuNi-Cu_(2)O/NiAlO_(x) nanosheets have been constructed through hydrothermal synthesis followed by calcination and H_(2) reduction treatment process. The in-situ formed CuNi nanoalloys (NAs) and nano-Cu_(2)O were evenly distributed on the bilateral surface of layered NiAlOx nanosheets. Based on the planar structure of nanosheet, the synergy between catalytic active CuNi NAs and photocatalytic active nano-Cu_(2)O endows CuNi-Cu_(2)O/NiAlO_(x) nanosheets with rapid conversion efficiency for catalyzing p-nitrophenol (p-Np, 14 mg·L^(−1)) to p-aminophenol (p-Ap) in 32 s with the reaction rate constant k up to 0.1779 s−1, and no obvious performance decay can be observed even over 27 cycles. Moreover, high concentration of p-Np at 10 and 20 g·L^(−1) could be reduced to p-Ap within 14 and 20 min, respectively. Such designed nanoalloy/bimetal-oxide heterostructure can provide a solution for rapid conversion of aminoaromatics from nitroaromatics wastewater even at a large concentration range.

关键词： layered CuNi-Cu_(2)O/NiAlO_(x) heterostructure catalyst p-nitrophenol p-aminophenol

Adsorption removal of o-nitrophenol and p-nitrophenol from wastewater by metal–organic framework Cr-BDC

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Chinese Journal of Chemical Engineering 2017年第6期25卷 775-781页

作者： Jianhua Chen Xue Sun Lijing Lin Xinfei Dong Yasan He College of Chemistry and Environmental Minnan Normal University Zhangzhou 363000 China Fujian province University Key Laboratory of modern Analytical Science and Separation Technology Minnan Normal University Zhangzhou 363000 China

In the present paper, a metal–organic framework Cr-BDC was prepared and used as adsorbent for adsorption of o-nitrophenol(ONp) and p-nitrophenol(pNp) from aqueous solutions. Cr-BDC was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and BET methods. The results indicate that Cr-BDC gets a very large specific surface area of 4128 m^2·g^(-1)and pore sizes are concentrated in 1 nm, which is a benefit for using for wastewater treatment. The influences of the adsorption conditions, such as temperature,solution concentration, adsorption time and reusability on adsorption performance were investigated. Cr-BDC exhibited an encouraging uptake capacity of 310.0 mg·g^(-1)for ONp, and adsorption capacity of Cr-BDC for ONp is significantly higher than that for pNp under suitable adsorption conditions. The characterizations of adsorption process were examined with the Lagergren pseudo-first-order, the pseudo-second-order kinetic model, and the intra-particular diffusion model. Kinetics experiments indicated that the pseudo-second-order model displayed the best correlation with adsorption kinetics data. Furthermore, our adsorption equilibrium data could be better described by the Freundlich equation. The results indicate that the as-prepared Cr-BDC is promising for use as an effective and economical adsorbent for ONp removal.

关键词： Metal-organic framework o-nitrophenol p-nitrophenol Isomers Adsorption

Mechanistic study of ozonation of p-nitrophenol in aqueous solution

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Journal of Environmental Sciences 2005年第6期17卷 926-929页

作者： SHI Hui-xiang XU Xian-wen WANG Da-hui WANG Qi-da Department of Environmental Engineering Zhejiang University Hangzhou 310027 China Environmental Engineering Technology Evaluation Center of Zhejiang province Hangzhou 310012 China Hangzhou Harmony Trade Go. Ltd Hangzhou310009 China

Ozonlysis in the treatment of p-nitrophenol solution was studied in this paper. The results indicated that the decomposition of pnitrophenol was accelerated as the gas flow rate or pH value increased. When gaseous ozone concentration was 20.11 mg/L and pH was 3, after 24 m in reaction, the removal rate of p-nitrophenol reached 73.04%, 86. 11%, 91.71% and 95% at the gas flow rate of 32, 40, 48 and 56 ml/min respectively. And when pH was 3, 4, 5, 6, the decomposition rate was 66.38%, 82.09%, 90.46%, 97.50% after a 20 min reaction respectively. It was mainly O3 molecule that took part in the decomposition when pH was 3. The main intermediates during the decomposition include catechol, o-benzoquinone, hydroquinone, p-benzoquinone, phenol, fumaric acid, maleic acid, oxalic acid and formic acid. The decomposition mechanism of p-nitrophenol was also discussed.

关键词： ozonation p-nitrophenol decomposition mechanism

Quality Control of paracetamol Generic Tablets Marketed in Benin and Search of Its Two Impurities p-Aminophenol and p-nitrophenol by HpLC-UV/Visible

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American Journal of Analytical Chemistry 2022年第11期13卷 449-460页

作者： Yemoa Loconon Achille Agbokponto Janvier Engelbert Assanhou Assogba Gabin Adetona pauline Doffon parfait Ganfon Habib Roland Marini Djang’eing’a Laboratoire de Chimie analytique et Analyse des Médicaments Unité de Formation et de Recherche en Pharmacie Faculté des Sciences de la Santé. Université d’Abomey Calavi Cotonou Bénin Laboratoire de pharmacie Galénique et de Technologie pharmaceutique Unité de Formation et de Recherche en Pharmacie Faculté des Sciences de la Santé Université d’Abomey Calavi Cotonou Bénin Laboratoire de pharmacognosie et de de phytothérapie Unité de Formation et de Recherche en Pharmacie Faculté des Sciences de la Santé Université d’Abomey Calavi Cotonou Bénin Laboratoire de Chimie Analytique pharmaceutique Departement de Pharmacie Université de Liège (ULiège) Liège Belgium

In this work, we evaluated the quality of paracetamol generic tablets while seeking its two main impurities namely 4-para-aminophenol (4-Ap) and 4-para-nitrophenol (4-Np) which have nephrotoxic and teratogenic properties. Ninety-four (94) samples were collected at various levels of the medicine supply chain and illegal markets in Benin for quality control tests such as visual inspection, pharmacotechnical tests as mass variation, disintegration test, dissolution test, followed by HpLC UV-Vis identification and assay of paracetamol, 4-Ap and 4-Np. The analytes were separated on C18 Lichrocart column (250 mm × 4.0 mm i.d, 5 μm);the mobile phase was MeOH:10 mM ammonium acetate buffer pH 6.8 (35:65) pumped at a flow rate of 1 ml/min. The detection was done at 245 nm. Analysis of our results shows that 77.7% of the samples did not comply with the visual inspection test requirements, 2.1% did not pass the mass variation test, 24.3% of the sample batches didn’t comply with the disintegration test requirements. In addition none of these uncomply batches passed the dissolution test, even if the identification test indicated that all samples contained paracetamol. None contained 4-Np (acceptance limit p), while 3 of 94 samples contained 4-Ap but within acceptance limit (4-Ap p). As for the paracetamol assay, 80.9% complied with the specifications of the pharmacopoeias taken as reference (90% - 110%;USp). Further, broader studies should be conducted according to the same rules of good practice for a more comprehensive analysis of the situation. Generally the quality control of paracetamol in most African countries, particularly in Benin, is based on pharmacotechnical tests and paracetamol assay. This work, in addition to the usual tests, showed the importance to search for paracetamol and other drugs’ impurities during their routine quality control.

关键词： Quality Control Substandard Medicines paracetamol p-Aminophenol p-nitrophenol Benin

Frequency effect on p-nitrophenol degradation under conditions of strict acoustic and electric control

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Water Science and Engineering 2011年第1期4卷 74-82页

作者： Chang-ping ZHU Bo HUANG Qing-bang HAN Cai-hua NI Guang-jun ZHU Ming-hua LIU Ming-lei SHAN College of Computer and lnformation Engineering Hohai University Changzhou 213022 P. R. China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 P. R. China College of Information and Electrical Engineering China University of Mining and Technology Xuzhou 221008 P. R. China School of Chemical and Material Engineering Jiangnan University Wuxi 214122 P. R. China

The process of decomposing p-nitrophenol （pNp） with power ultrasound requires strict control of acoustic and electric conditions. In this study, the conditions, including acoustic power and acoustic intensity, but not ultrasonic frequency, were controlled strictly at constant levels. The absorbency and the COD concentrations of the samples were measured in order to show the variation of the sample concentration. The results show significant differences in the trend of the solution degradation rate as acoustic power increases after the pNp solution （with a concentration of ll4 mg/L and a pH value of 5.4） is irradiated for 60 min with ultrasonic frequencies of 530.8 kHz, 610.6 kHz, 855.0 kHz, and 1130.0 kHz. The degradation rate of the solution increases with time and acoustic power （acoustic intensity）. On the other hand, the degradation rate of the solution is distinctly dependent on frequency when the acoustic power and intensity are strictly controlled and maintained at constant levels, The degradation rate of the pNp solution declines with ultrasonic frequencies of 530.8 kHz, 610.6 kHz, 855.0 kHz, and 1 130.0 kHz; the COD concentration, on the contrary, increase.

关键词： ultrasonic treatment frequency effect COD concentration p-nitrophenol

Direct electrocatalytic reduction of p-nitrophenol at room temperature ionic liquid modified electrode

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Chinese Chemical Letters 2008年第10期19卷 1156-1158页

作者： Wei Sun Mao Xia Yang Qiang Jiang Kui Jiao College of Chemistry and Molecular Engineering Key Laboratory of Eco-Chemical Engineering of Ministry of Education Qingdao University of Science and Technology Qingdao 266042 PR China

Direct electrochemical reduction ofp-nitrophenol （pNp） was investigated on a room temperature ionic liquid N-butylpyridinium hexafluorophosphate （BppF6） modified carbon paste electrode （CILE）. The cathodic peak potential was positively shifted and the peak currents were increased compared to that obtained on traditional carbon paste electrode （CpE）. The results indicated that the presence of ionic liquid BppF6 on the electrode surface showed excellent catalytic ability to the electrochemical reduction of pNp. The electrochemical behaviors of pNp on the CILE were investigated by cyclic voltammetry and the conditions such as the scan rate, the buffer pH, the substrate concentration were optimized. The electrochemical parameters were further calculated with the results of the electron transfer number （n）, the charge-transfer coefficient （α） and the surface concentration （Гr） as 1.76, 0.37 and 2.47 × 10^-9 mol/cm^2, respectively, for the selected reductive peak. The results indicated that pNp showed an irreversible adsorption-controlled electrode process on the CILE.

关键词： N-Butylpyridinium hexafluorophosphate Ionic liquid p-nitrophenol Cyclic voltammetry Electrocatalysis

Activation of peroxydisulfate by gas-liquid pulsed discharge plasma to enhance the degradation of p-nitrophenol

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plasma Science and Technology 2017年第6期19卷 116-122页

作者：商克峰王浩李杰鲁娜姜楠吴彦 School of Electrical Engineering Dalian University of Technology Dalian 116024 People's Republic of China Key Laboratory of Industrial Ecology and Environmental Engineering MOE of China Dalian 116024People's Republic of China

pulsed discharge in water and over water surfaces generates ultraviolet radiation,local high temperature,shock waves,and chemical reactive species,including hydroxyl radicals,hydrogen peroxide,and ozone.pulsed discharge plasma（pDp） can oxidize and mineralize pollutants very efficiently,but high energy consumption restricts its application for industrial wastewater treatment.A novel method for improving the energy efficiency of wastewater treatment by pDp was proposed,in which peroxydisulfate（pDS） was added to wastewater and pDS was activated by pDp to produce more strong oxidizing radicals,including sulfate radicals and hydroxyl radicals,leading to a higher oxidation capacity for the pDp system.The experimental results show that the increase in solution conductivity slightly decreased the discharge power of the pulse discharge over the water surface.An increase in the discharge intensity improved the activation of pDS and therefore the degradation efficiency and energy efficiency of p-nitrophenol（pNp）.An increase in the addition dosage of pDS greatly facilitated the degradation of pNp at a molar ratio of pDS to pNp of lower than 80：1,but the performance enhancement was no longer obvious at a dosage of more than 80：1.Under an applied voltage of 20 kV and a gas discharge gap of 2 mm,the degradation efficiency and energy efficiency of the pNp reached 90.7%and45.0 mg kWh^（-1） for the plasma/pDS system,respectively,which was 34%and 18.0 mg kWh^（-1）higher than for the discharge plasma treatment alone.Analysis of the physical and chemical effects indicated that ozone and hydrogen peroxide were important for pNp degradation and UV irradiation and heat from the discharge plasma might be the main physical effects for the activation of pDS.

关键词： gas-liquid pulse discharge persulfate sulfate radical hydroxyl radical p-nitrophenol