检索结果-南通市图书馆

An internal circulation iron-carbon micro-electrolysis reactor for aniline wastewater treatment:Parameter optimization,degradation pathways and mechanism

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第11期63卷 96-107页

作者： Yanhe Han Han Xu Lei Zhang Xuejiao Ma Yang Man Zhimin Su Jing Wang Department of Environmental Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China SUEZ Environmental Technology(Beijing)Company Limited Beijing 100026China Beijing Ecological Environment Assessment and Complaint Center Beijing 100006China

aniline is a vital industrial raw material.However,highly-toxic aniline wastewater usually deteriorated effluent quality,posed a threat to human health and ecosystem safety.Therefore,this study reported a novel internal circulation iron-carbon micro-electrolysis(ICE)reactor to treat aniline wastewater.The effects of reaction time,pH,aeration rate and iron-carbon(Fe/C)ratio on the removal rate of aniline and the chemical oxygen demand were investigated using single-factor experiments.This process exhibited high aniline degradation performance of approximately 99.86% under optimal operating conditions(reaction time=20 min,pH=3,aeration rate=0.5 m3·h^(-1),and Fe/C=1:2).Based on the experimental results,the response surface method was applied to optimize the aniline removal rate.The Box–Behnken method was used to obtain the interaction effects of three main factors.The result showed that the reaction time had a dominant effect on the removal rate of aniline.The highest aniline removal rate was obtained at pH of 2,aeration rate of 0.5 m^(3)·h^(-1)and reaction time of 30 min.Under optional experimental conditions,the aniline content of effluent was reduced to 3 mg·L^(-1)and the removal rate was as high as 98.24%,within the 95% confidence interval(97.84%-99.32%)of the predicted values.The solution was treated and the reaction intermediates were identified by high-performance liquid chromatography,ultraviolet-visible spectroscopy,Fourier-transform infrared spectroscopy,gas chromatography-mass spectrometry,and ion chromatography.The main intermediates were phenol,benzoquinone,and carboxylic acid.These were used to propose the potential mechanism of aniline degradation in the ICE reactor.The results obtained in this study provide optimized conditions for the treatment of industrial wastewater containing aniline and can strengthen the understanding of the degradation mechanism of iron-carbon micro-electrolysis.

关键词： aniline Iron-carbon micro-electrolysis Circulating fluidized bed Waste water Degradation

Biodegradation of aniline by Candida tropicalis AN1 isolated from aerobic granular sludge

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第12期23卷 2063-2068页

作者： Dianzhan Wang Guanyu Zheng Shimei Wang Dewei Zhang Lixiang Zhou Department of Environmental Engineering College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 China Department of Biology Hong Kong Baptist University Hong Kong 999077 China

aniline-degrading microbes were cultivated and acclimated with the initial activated sludge collected from a chemical wastewater treatment plant. During the acclimation processes, aerobic granular sludge being able to effectively degrade aniline was successfully formed, from which a preponderant bacterial strain was isolated and named as AN1. Effects of factors including pH, temperature, and second carbon/nitrogen source on the biodegradation of aniline were investigated. Results showed that the optimal conditions for the biodegradation of aniline by the strain AN1 were at pH 7.0 and 28–35°C. At the optimal pH and temperature, the biodegradation rate of aniline could reach as high as 17.8 mg/（L·hr） when the initial aniline concentration was 400 mg/L. Further studies revealed that the addition of 1 g/L glucose or ammonium chloride as a second carbon or nitrogen source could slightly enhance the biodegradation efficiency from 93.0% to 95.1%–98.5%. However, even more addition of glucose or ammonium could not further enhance the biodegradation process but delayed the biodegradation of aniline by the strain AN1. Based on morphological and physiological characteristics as well as the phylogenetic analysis of 26S rDNA sequences, the strain AN1 was identified as Candida tropicalis.

关键词： aniline aerobic granular sludge biodegradation Candida tropicalis AN1

Synergistic removal of aniline by carbon nanotubes and the enzymes of Delftia sp. XYJ6

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第7期23卷 1165-1170页

作者： Hai Yan Xiaojing Yang Jian Chen Chunhua Yin Chengbin Xiao Hao Chen School of Chemical and Biological Engineering University of Science and Technology Beijing Beijing 100083 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Synergistic removal of aniline by carbon nanotubes and the enzymes of Delftia sp. XYJ6, a newly isolated bacterial strain for biodegrading aniline, was investigated. It showed that biodegradation rate of aniline was increased with the augment of protein concentration in cell-free extract of Delftia sp. XYJ6. The adsorption amount of aniline by multi-walled carbon nanotubes （MWCNTs） was slightly higher than that by single-walled carbon nanotubes （SWCNTs）, however the adsorption amount of protein of Delftia sp. XYJ6 by MWCNTs was lower than that by SWCNTs. Much more amount of aniline could be removed by CE of Delftia sp. XYJ6 in the presence of SWCNTs than MWCNTs, which indicated that an efficient reaction between aniline and enzymes of Delftia sp. XYJ6 on the surface of SWCNTs played a key role in the rapid enzymatic biodegradation of aniline. This study is not previously reported and may be useful in basic research and the removal of aniline from wastewater.

关键词： aniline Delftia sp. XYJ6 carbon nanotubes biodegradation adsorption

Competitive and cooperative adsorption behaviors of phenol and aniline onto nonpolar macroreticular adsorbents

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第4期17卷 529-534页

作者： ZHANGWei-ming CHENJin-long PANBing-cai ZHANGQuan-xing StateKeyLaboratoryofPollutionControlandResourcesReuse SchooloftheEnvironmentNanjingUniversityNanjing210093China

The adsorption behaviors of phenol and aniline on nonpolar macroreticular adsorbents(NDA100 and Amberlite XAD4) were investigated in single or binary batch system at 293K and 313K respectively in this study. The results indicated that the adsorption isotherms of phenol and aniline on both adsorbents in both systems fitted well Langmuir equation, which indicated a favourable and exothermic process. At the lower equilibrium concentrations, the individual amount adsorbed of phenol or aniline on macroreticular adsorbents in single-component systems was higher than those in binary-component systems because of the competition between phenol and aniline towards the adsorption sites. It is noteworthy, on the contrast, that at higher concentrations, the total uptake amounts of phenol and aniline in binary-component systems were obviously larger than that in single-component systems, and a large excess was noted on the adsorbent surface at saturation, which is presumably due to the cooperative effect primarily arisen from the hydrogen bonding or weak acid-base interaction between phenol and aniline.

关键词： macroreticular adsorbent phenol aniline competitive adsorption cooperative adsorption

aniline as a TICT rotor to derive methine fluorogens for biomolecules:A curcuminoid-BF2 compound for lighting up HSA/BSA

在线全文

学校读者我要写书评

暂无评论

中国化学快报：英文版 2023年第2期34卷 372-375页

作者： Yue Zhang Wei Zhou Ning Xu Guangying Wang Jin Li Kai An Wenchao Jiang Xuelian Zhou Qinglong Qiao Xindong Jiang Zhaochao Xu Liaoning&Shenyang Key Laboratory of Functional Dye and Pigment Shenyang University of Chemical TechnologyShenyang 110142China CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

The unique structure of fluorescent proteins in which the fluorophore is encapsulated by the protein shell to restrict rotation and emit light inspired the screening of chromophores that selectively bind to biomolecules to generate fluorescence. In this paper, we report a curcuminoid-BF2-like fluorescent dye NBF2containing 4-dimethylaniline as an electron-donating group. When this dye is combined with HSA or BSA, the fluorescence is enhanced 90/112-fold, and the fluorescence quantum yield increases from aniline moiety caused by charge transfer after the fluorophore is excited by light. N-BF2has fast and strong binding to HSA or BSA and was found to be reversible in solution and intracellularly. Since N-BF2also has the ability to target lipid droplets, the complex of N-BF2/HSA realizes the regulation of reversible lipid droplet staining in cells.

关键词： Fluorogen aniline TICT HSA Methine dyes

Kinetics of aniline oxidation with chlorine dioxide

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2004年第2期16卷 238-241页

作者： FANZhi-yun HUANGJun-li WANGPeng SULi-qiang ZHENGYong-jie LIYing-jie SchoolofMunicipalandEnvironmentalEngineering HarbinInstituteofTechnologyHarbin150090China AnalysisCenter SchoolofChemistryandChemistryEngineeringQiqiharUniversityQiqihar161006China

For the first time, kinetics of aniline oxidation with chlorine dioxide(ClO 2) were investigated systematically by detecting concentration of aniline with HPLC at regular intervals. Results showed that the reaction was first-order both in ClO 2 and in aniline, and the oxidation reaction could be described as second-order reaction. Stoichiometric factor η was experimentally determined to be 2 44. The second-order-reaction rate constant k was 0 11 L/(mol·s) under condition of pH 6 86 and water temperature(T w) 287K. Reaction activation energy was 72 31 kJ/mol, indicating that the reaction could take place under usual water treatment conditions. The reaction rate constants in acidic and alkali media were greater than that in neutral medium. Chlorite ion could slightly increase reaction rate in acidic medium. p-aminophenol and azobenzene were detected by GC-MS as intermediates.

关键词： chlorine dioxide aniline kinetics

A novel and complete gene cluster involved in the degradation of aniline by Delftia sp. AN3

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第6期20卷 717-724页

作者： ZHANG Tao ZHANG Jinglei LIU Shuangjiang LIU Zhipei Laboratory of Environmental Microbiology Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

A recombinant strain, Escherichia coli JM109-AN1, was obtained by constructing of a genomic library of the total DNA of Delftia sp. AN3 in E. coli JM109 and screening for catechol 2,3-dioxygenase activity. This recombinant strain could grow on aniline as sole carbon, nitrogen and energy source. Enzymatic assays revealed that the exogenous genes including aniline dioxygenase （AD） and catechol 2,3-dioxygenase （C230） genes could well express in the recombinant strain with the activities of AD and C230 up to 0.31 U/mg wet cell and 1.92 U/mg crude proteins, respectively. The AD or C23O of strain AN3 could only catalyze aniline or catechol but not any other substituted substrates. This recombinant strain contained a recombinant plasmid, pKC505-AN1, in which a 29.7-kb DNA fragment from Delftia sp. AN3 was inserted. Sequencing and open reading frame （orfs） analysis of this 29.7 kb fragment revealed that it contained at least 27 orfs, among them a gene cluster （consisting of at least 16 genes, named danQTA1A2BRDCEFG1HIJKG2） was responsible for the complete metabolism of aniline to TCA-cycle intermediates. This gene cluster could be divided into two main parts, the upper sequences consisted of 7 genes （danQTA1A2BRD） were predicted to encode a multi-component aniline dioxygenase and a LysR-type regulator, and the central genes （danCEFG1HIJKG2） were expected to encode meta-cleavage pathway enzymes for catechol degradation to TCA-cycle intermediates. Unlike clusters tad from Delftia tsuruhatensis AD9 and tdn from Pseudomonas putida UCC22, in this gene cluster, all the genes were in the same transcriptional direction. There was only one set of C230 gene （danC） and ferredoxin-like protein gene （danD）. The presence of only one set of these two genes and specificity of AD and C230 might be the reason for strain AN3 could only degrade aniline. The products of danQTA1A2BRDC showed 99%-100% identity to those from Delftia acidovorans 7N, and 50%-85% identity to those of tad cluster from D. tsuruhatensis AD9 in amino acid residues. Be

关键词： aniline biodegradation Delftia sp. AN3 genomic library aniline degradative gene cluster

Recovery of aniline from Wastewater by Nitrobenzene Extraction Enhanced with Salting-Out Effect

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2010年第3期23卷 208-212页

作者： CHANG-HAI LI Department of Chemical Engineering Binzhou UniversityBinzhou 256603ShangdongChina School of Chemical Engineering Changchun University of TechnologyChangchun 130012JilinChina

Objective Nitrobenzene extraction enhanced by salting-out effect was employed to recover aniline from wastewater at 25 ℃. Method Batchwise experiments were conducted to elucidate the influence of various operating variables on the extracting performance, including acidity of wastewater, initial aniline concentration, ratios of solvent to wastewater, extraction stages, concentrations and different types of inorganic salts, such as NaCl, KCI, Na2SO4, CaCl2 and K29O4. Results Nitrobenzene with a concentration of 20% and a pH value of 9.1 at the temperature of 25 ℃ together with NaCl of a concentration of 14 wt.% realized nearly 100% aniline recovery at the fifth stage of wastewater treatment. Conclusions High pH values and volume ratios of nitrobenzene/wastewater are more suitable for recovery of aniline. In addition, recovery of aniline is significantly elevated with increase of the concentration of salts, whose promoting effects are in the following order: NaCI〉Na2SO4〉K2SO4〉CaC12〉KCI on the weight basis of wastewater. Furthermore, aniline in wastewater can be almost completely recovered by five-stage sequential nitrobenzene extraction, which is promoted continuously by the salting-out effect.

关键词： aniline Nitrobenzene Extraction Salting-out

Improved photocatalytic activity of surface charge functionalized ZnO nanoparticles using aniline

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第17期76卷 1-10页

作者： Chatchai Rodwihok Korakot Charoensri Duangmanee Wongratanaphisan Won Mook Choi Seung Hyun Hur Hyun Jin Park Jin Suk Chung School of Chemical Engineering University of Ulsan680-749.South ICorea Department of Biotechnology College of Life Sciences andBiotechnologyKorea University145 Anam-roSeongbuk-guSeoul02841South Korea Research Center in Physics andAstronomy Faculty of ScienceChiang Mai UniversityChiang Mai50200Thailand

Functionalization of aniline molecules on zinc oxide(ZnO)nanoparticles is reported using a simple impregnation technique.Functionalized ZnO samples were systematically characterized based on morphology,surface and optical properties,and photocatalytic performance towards methyl orange(MO).aniline functionalization increased the surface charge of the modified ZnO.Compared to pristine ZnO,the aniline-functionalized ZnO yielded faster photodegradation of MO,degrading 98.29%of MO in 60 min and superoxide radicals were the major species during the MO photodegradation reaction.These results indicate that the improvement of photocatalytic degradation could be attributed to opposite charge-induced surface adsorption.Hence,protonated amine as a positively charged molecule was expected to increase the surface adsorption of MO(as an anionic dye)on ZnO nanoparticles surfaces,thereby increasing their photocatalytic degradation performance.

关键词： Photocatalysts Surface charge ZnO aniline Methyl orange