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Effects of bacterially produced precipitates on the metabolism of sulfate reducing bacteria during the bio-treatment {1. of copper-containing wastewater

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Science china Chemistry 2010年第12期53卷 2608-2615页

作者： SHENG YuXing,cao hongbin,{2. YuPing & zhang yi National engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green process and engineering,institute of process engineering,chinese academy of {12.,Beijing 100190,china National engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green process and {1. Institute of Process Engineering Chinese Academy of Sciences Beijing China

A large volume of bacterially produced precipitates are generated during the bio-treatment of heavy metal *** composition of the bacterially produced precipitates and its effects on sulfate reducing bacteria (SRB) in copper-containing waste stream were evaluated in this *** elemental composition of the microbial precipitate was studied using electrodispersive X-ray spectroscopy (EDX),and it was found that the ratio of S:Cu was *** with the results of copper distribution in the SRB metabolism culture,which was analyzed by the sequential extraction procedure,copper in the precipitates was determined as covellite (CuS).The bacterially produced precipitates caused a decrease of the sulfate reduction rate,and the more precipitates were generated,the lower the sulfate reduction rate *** particle sizes of bacterially generated covellite were ranging from 0.03 to 2.m by particles size distribution (PSD) analysis,which was smaller than that of the SRB *** electron microscopy (TEM) analysis showed that the microbial covellite was deposited on the surface of the *** effects of the microbial precipitate on SRB metabolism were found to be weakened by increasing the precipitation time and adding microbial polymeric substances in later *** results provided direct evidence that the SRB activity was inhibited by the bacterially produced covellite,which enveloped the bacterium and thus affected the metabolism of SRB on mass transfer.

关键词： sulfate reducing bacteria covellite heavy metal wastewater

Heterogeneous Fenton-like degradation of 4-chlorophenol using iron/ordered mesoporous carbon catalyst

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Journal of Environmental sciences 2014年第5期26卷 1171-1179页

作者： Feng Duan Yuezhu Yang Yuping li {1. {2. yi Wang yi zhang National engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green process and {1. Institute of Process Engineering Chinese Academy of Sciences School of Chemical and Biological engineering Changsha University of Science and Technology

Ordered mesoporous carbon supported iron catalysts （Fe/OMC） were prepared by the incipient wetness impregnation method and investigated in Fenton-like degradation of 4-chlorophenol （4CP） in this work. XRD and TEM characterization showed that the iron oxides were well dispersed on the OMC support and grew bigger with the increasing calcination temperature. The catalyst prepared with a lower calcination temperature showed higher decomposition efficiency towards 4CP and H{1.{1. but more metals were leached. The effect of different operational parameters such as initial pH, H{1.{1.dosage, and reaction temperature on the catalytic activity was evaluated. The results showed that 96.1. of 4CP and 47.4% of TOC was removed after {1.0 min at 30℃, initial pH of 3 and 6.6 mmol/L H{1.{1.88% of 4CP removal efficiency was retained after three successive runs, indicating Fe/OMC a stable catalyst for Fenton reaction. 4CP was degraded predominately by the attack of hydroxyl radical formed on the catalyst surface and in the bulk solution due to iron leaching. Based on the degradation intermediates detected by high performance liquid chromatography, possible oxidation pathways were proposed during the 4CP degradation.

关键词： ordered mesoporous carbon calcination temperature hydrogen peroxide hydroxyl radical heterogeneous Fenton

Effects of sulfide on sulfate reducing bacteria in response to Cu(II), Hg(II) and Cr(VI) toxicity

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chinese Science Bulletin 2011年第9期56卷 862-868页

作者： SHENG YuXing cao {1. {2. YuPing zhang yi National engineering Laboratory for Hydrometallurgical Cleaner Production Technology Beijing 100190China Key Laboratory of Green process and {1. Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Sulfate reducing bacteria (SRB) is identified as the primary organisms responsible for the treatment of heavy metal wastewater. However, most heavy metals can inhibit the growth of SRB during heavy metal treatment processes. Sulfide is a metabo{1.c product of SRB and it can precipitate or reduce heavy metals. This study focused on the effects of sulfide on SRB resistance to Cu(II), Hg(I) and Cr(VI) toxicity. First, we considered the existence style of various heavy metals with and without sulfide addition by sequential extraction experiments. Second, the particle size distribution was evaluated and the cell structure during the metabo{1.sm of a SRB culture, containing different heavy metals, was analyzed by particle size distribution and TEM analyses. Third, the evolution of sulfate under the influence of different concentrations of heavy metals with and without sulfide addition was investigated to evaluate SRB activity. The results indicated that sulfide played an important role in alleviating and even e{1.minating the toxicity of Cu(II), Hg(II) and Cr(VI). We also discuss the mechanism of sulfide on SRB resistance to Cu(II), Hg(I) and Cr(VI) toxicity.

关键词：硫酸盐还原菌 Cr(VI) 汞毒性硫化铜金属硫化物铬(VI) 作者废水生物处理

Application of triple potential step amperometry method for quantitative electroanalysis

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chinese Science Bulletin 2007年第20期52卷 2771-2774页

作者： liU ChenMing {1. {2. li YuPing zhang yi institute of {1. {2. Chinese Academy of Sciences Beijing 100080 China Graduate University of chinese academy of sciences Beijing 100049 China

A novel quantitative electroanalysis method, triple potential step amperometry (TPSA), was developed and explained with an example of nitrobenzene analyzing in water. The selectivity of TPSA was im- proved by controlling the potential step within a narrow interval and using enzyme-modified electrode, the narrow potential step makes the method avoid most interferents, and enzyme-modified electrode can enhance the response of target substance selectively. The peak area was investigated for quanti- tative calibration, such as nitrobenzene concentration showing a linear relation with the peak area, with the correlation coefficients being 0.9995. The t-test and F-test were applied to evaluating the reliability of TPSA, the results showed that there was no evidence of systematic error for TPSA, and the method was of no significant difference from CV. The merit of fast detecting and few potential changing times make the TPSA suitably applicable to low-cost automatic monitoring equipments.

关键词：电流测定法电阻板电量电解电子学

Removal of Cd^(2.) from water by Friedel's salt (FS:3{1.·A1.2._3 ·CaCl_2.·1.H_2.): Sorption characteristics and mechanisms

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Journal of Environmental sciences 2013年第9期25卷 1719-1725页

作者： Juanjuan zhang He Zhao {1. {2. Heping li Zhibao li Key Laboratory of Green process and {1. Institute of Process Engineering Chinese Academy of Sciences College of Chemical and Biologic engineering Changsha University of Science and Technology National engineering Laboratory for Hydrometallurgical Cleaner Production Technology

The development of low-cost and efficient new mineral adsorbents has been a hot topic in recent years. In this study, Friedel＇s salt （FS：3cao·A1.1.3 ·CaCl{1.·1.H{1.）, a hexagonal layered inorganic absorbent, was synthesized to remove Cd{1. from water. The adsorption process was simulated by Langmuir and Freund{{1.ch models. The adsorption mechanism was further analyzed with TEM, XRD, FT-IR analysis and monitoring of metal cations released and solution pH variation. The results indicated the adsorbent FS had an outstanding abi{{1.ty for Cd（Ⅱ） adsorption. The maximum adsorption capacity of the FS for Cd（Ⅱ） removal can reach up to 671.1. mg/g. The nearly equal numbers of Cd{1. adsorbed and Ca{1. released demonstrated that ion-exchange （both surface and inner） of the FS for Cd（Ⅱ） played an important role during the adsorption process. Furthermore, the surface of the FS after adsorption was microscopically disintegrated while the inner lamellar structure was almost unchanged. The behavior of Cd（Ⅱ） adsorption by FS was significantly affected by surface reactions. The mechanisms of Cd{1. adsorption by the FS mainly included surface complexation and surface precipitation. In the present study, the adsorption process was fitted better by the Langmuir isotherm model （R{1.= 0.9999） than the Freund{{1.ch isotherm model （R{1.= 0.81.1.）. Finally, due to the high capacity for ion-exchange on the FS surface, FS is a promising layered inorganic adsorbent for the removal of Cd（Ⅱ） from water.

关键词： Friedel’s salt cadmium adsorption isotherm mechanism

Highly selective metal recovery from spent lithium-ion batteries through stoichiometric hydrogen ion replacement

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Frontiers of Chemical Science and engineering 2021年第5期15卷 1243-1256页

作者： Weiguang Lv Xiaohong Zheng li li {2. cao yi zhang Renjie Chen Hancheng Ou Fei Kang Zhi Sun National engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing100190China School of Chemical engineering University of Chinese Academy of SciencesBeijing100190China School of Materials Science&engineering Beijing Institute of TechnologyBeijing100081China Ganzhou Highpower Technology Co. Ltd.Ganzhou341000China

Spent lithium-ion battery recycling has attracted significant attention because of its importance in regard to the environment and resource *** hydrometallurgical methods usually leach all valuable metals and subsequently extract target meals to prepare corresponding ***,li recovery in these processes requires lengthy operational procedures,and the recovery efficiency is *** this research,we demonstrate a method to selectively recover lithium before the leaching of other elements by introducing a hydrothermal *** 90%of li is leached from high-Ni layered oxide cathode powders,while consuming a nearly stoichiometric amount of hydrogen *** this selective recovery of li,the transition metals remain as solid residue hydroxides or ***,the extraction of li is found to be highly dependent on the content of transition metals in the cathode materials.A high leaching selectivity of li(>98%)and nearly 95%leaching efficiency of li can be reached with liNi_(0.8)Co_(0.1)Mn_(0.1)O_(2..In this case,both the energy and material consumption during the proposed li recovery is significantly decreased compared to traditional methods;furthermore,the proposed method makes full use of H+to leach li+.This research is expected to provide new understanding for selectively recovering metal from secondary resources.

关键词： recycling spent liBs selective recovery hydrothermal treatment

Whole-process Pollution Control for Cost-Effective and Cleaner Chemical Production A Case Study of the Tungsten Industry in{1.

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engineering 2019年第4期5卷 768-776页

作者： hongbin {1. He Zhao Di {2. Chenming liu Xiao lin Yuping li Pengge Ning Jiajun Sun yi {2. Zhi Sun Beijing engineering Research Center of {1. Pollution Control and National engineering Laboratory for Hydrometallurgical Cleaner Production Technology Division of Environment Technology and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

In this research,a methodology named whole-process pollution control(WPPC)is demonstrated that improves the effectiveness of process *** methodology considers waste/emission treatment as a step of the whole production process with respect to the minimization of cost and environmental impact for the whole *** following procedures are introduced in a WPPC process optimization:①a material and energy flow investigation and optimization based on a systematic understanding of the distribution and physiochemical properties of potential pollutants;②a process optimization to increase the utilization efficiency of different elements and minimize pollutant emissions;and③an evaluation to reveal the effectiveness of the optimization *** production of ammonium paratungstate was chosen for the case *** factors of the different optimization schemes-namely the cost-effectiveness factor and the environmental impact indicator-were evaluated and *** research demonstrates that by considering the nature of potential pollutants,technological innovations,economic viability,environmental impacts,and regulation requirements,WPPC can efficiently optimize a metal production process.

关键词： Whole-process pollution control process optimization Industrial pollution Tungsten

Hybrid post-processing effects of magnetic abrasive finishing and heat treatment on surface integrity and mechanical properties of additively manufactured Inconel 71. superalloys

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Journal of Materials Science & Technology 2022年第33期128卷 10-21页

作者： Kun li Ruijin Ma Ming {1. Wen Chen {2. li David Z.{1. Qian Tang Lawrence E.Murr Jinfeng li Huajun cao State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Metal Additive Manufacturing(3D Printing) Chongqing UniversityChongqing 400044China College of engineering Mathematics and Physical SciencesUniversity of ExeterNorth Park RoadExeter EX44QFUK W.M.Keck Center for 3D Innovation University of Texas at El PasoEl PasoTX 79968USA Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA institute of Materials China Academy of Engineering PhysicsMianyang 621908China

Desired microstructure and surface integrity are critical to achieving the high performance of additively manufactured *** the present work,the hybrid post-processes of magnetic abrasive finishing(MAF)and post-heat treatment(HT)were app{1.ed to the additively manufactured Inconel71. *** hybrid effects and influencing mechanism on the surface qua{1.ty and mechanical properties of the additively manufactured samples have been studied *** results show that the MAF process effectively reduces the surface roughness by more than an order of magnitude due to the flexibi{1.ty and geometric consistency of the magnetic particles and abrasives with the finished *** proper sequence of MAF and HT obtains enhanced mechanical properties for the homogenized-MAF-aged sample with the yield strength of 1.47 MPa,the ultimate tensile strength of 1.34 MPa,and the elongation of 2..9%,which exceeds the standard wrought *** surface integrity,compressive residual stress field,and grain refinement induced by the MAF and subsequent aging heat treatment increase the cracking resistance and delay the fracture failure,which significantly benefits the mechanical *** MAF process combined with proper post-heat treatment provides an effective pathway to improve the mechanical properties of additively manufactured materials.

关键词： Magnetic abrasive finishing Additive manufacturing Inconel 71. Microstructure–property relationship Heat treatment

Investigation of solution chemistry to enable efficient lithium recovery from low-concentration lithium-containing wastewater

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Frontiers of Chemical Science and engineering 2020年第4期14卷 639-650页

作者： Chunlong Zhao Mingming He hongbin {1. Xiaohong Zheng Wenfang Gao Yong Sun He Zhao Dalong {2.u Yan{2.ng zhang Zhi Sun State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Beijing engineering Research Center of {1. Pollution Control Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Nottingham Ningbo china Ningbo 315100China Henan Bingsheng Biotechnology Company limited Kaifeng 475103China

In the production of lithium-ion batteries(liBs)and recycling of spent liBs,a large amount of low-concentration lithium-containing wastewater(LCW)is *** recovery of li from this medium has attracted significant global attention from both the environmental and economic *** achieve effective li recycling,the features of impurity removal and the interactions among different ions must be ***,it is generally dificult to ensure highly efficient removal of impurity ions while retaining li in the solution for further *** this study,the removal of typical impurity ions from LCW and the interactions between these species were systematically investigated from the thermodynamic and kinetics *** was found that the main impurities(e.g.,Fe^+,AIP^+,Ca^2.,and Mg^2.)could be efficiently removed with high li recovery by control-ling the ionic strength of the *** mechanisms of Fe^3+,Al^+,Ca^2.,and Mg^2.removal were investigated to identify the controlling steps and reaction *** was found that the precipitates are formed by a zero-order reaction,and the activation energies tend to be low with a sequence of fast chemical reactions that reach equilibrium very ***,this study focused on li loss during removal of the impurities,and the corresponding removal rates of Fe^+,Al^+,Ca^2.,and Mg^2.were found to be 99.8%,99.5%,99%,and 99.7%,***-quently,high-purity lisPO4 was obtained via one-step ***,this research demonstrates a potential route for the effective recovery of li from low-concentra-tion LCW and for the appropriate treatment of acidic LCW.

关键词： lithium-containing wastewater lithium phos-phate precipitation impurity ion