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Efficacy of chalcopyrite bioleaching using a pure and a mixed bacterium

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Journal of University of Science and Technology Beijing 2006年第1期13卷 7-10页

作者： muqing qiu Shuiying Xiong Weimin Zhang Institute of Ecology College of Life Science Zhejiang University Hangzhou 310029 China Department of Environmental Engineering East China Institute of Technology Fuzhou 344000 China

To determine the efficacy of chalcopyrite bioleaching using pure cultures of Thiobacillus ferrooxidans or Thiobacillus thiooxidans and a mixed culture composed of Thiobacillus ferrooxidans and Thiobacillus thiooxidans, experiments were carried out in shake flasks with [Fe^2＋] 4 g·L^-1 and S 1 g·L^-1 at pH=1.80, 130 r/min and 30℃. The tests showed that the copper extraction in a mixed culture composed of Thiobacillusferrooxidans and Thiobacillus thiooxidans is higher than that in a pure culture. On the other hand, an important potential of Thiobacillus thiooxidans to leaching chalcopyrite was indicated. Thiobacillus thiooxidans can prevent jarosites accumulating on the substrate and allow further copper to dissolute through the action of ferric ion. The selection of the suitable pH in a leaching solution would be significant. Thiobacillus thiooxidans and Thiobacillus ferrooxidans play an important role in the bioleaching process. Finally, the mechanism and the reason for iron precipitation were also discussed in detail.

关键词： chalcopyrite mixed culture Thiobacillus ferrooxidans Thiobacillus thiooxidans pH

Optimizing conditions for bacterial leaching of copper from discarded mines

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Journal of University of Science and Technology Beijing 2006年第2期13卷 108-111页

作者： muqing qiu Genxuan Wang Weimin Zhang Shuiying Xiong Institution of Ecology College of Life Science Zhejiang University Hangzhou 310029 China Department of Environment and Construction East China Institute of Technology Fuzhou 344000 China

The effect of process parameters （pH, pulp density, inoculum volume, ferrous content, particle size） on the rate of copper solubilization was analyzed respectively through bioleaching tests with mixed bacteria in shake flasks. These results show that the optimal process parameters are： pH, 1.50-1.80; pulp density, 5wt%; inoculum volume, 10vol%; ferrous content, 2g·L^-1; particle size, 〈0.076 mm. Furthermore, when the pH value is below 1.50 in leaching solution, the iron precipitated can be reduced to a great extent, but it shows low bacterial activity at this pH. Finally, it is emphasized that the optimal parameters are also determined by economical benefit.

关键词： bioleaching optimization mixed bacteria process parameters

Challenges of organic pollutant photocatalysis by biochar‑based catalysts

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Biochar 2021年第2期3卷 117-123页

作者： muqing qiu Baowei Hu Zhongshan Chen Hui Yang Li Zhuang Xiangke Wang School of Life Science Shaoxing UniversityHuancheng West Road 508Shaoxing 312000People’s Republic of China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206People’s Republic of China

With the fast development of industrialization and urbanization,large amounts of organic pollutants are released into the natural *** efficient elimination of organic pollutants is thereby crucial for environmental pollution treatment and human *** the last decades,photocatalytic degradation of persistent organic pollutants has attracted multidisciplinary interest because of its simple operation on a large ***,the whole processes for the photocatalytic degradation of organic pollutants are still *** this perspective,the contribution of reactive species,the contribution of photocatalysts,the analysis of intermediate products,the charge transfer and fast carrier recombination are discussed on biochar-based photocatalysts.

关键词： Photocatalytic degradation Persistent organic pollutants Biochar-based catalyst Mechanism

Biochar for the removal of contaminants from soil and water:a review

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Biochar 2022年第1期4卷 864-888页

作者： muqing qiu Lijie Liu Qian Ling Yawen Cai Shujun Yu Shuqin Wang Dong Fu Baowei Hu Xiangke Wang School of Life Science Shaoxing UniversityShaoxing 312000People’s Republic of China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206People’s Republic of China Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and EngineeringNorth China Electric Power UniversityBaoding 071003People’s Republic of China

Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface *** review aims to highlight biochar production technologies,characteristics of biochar,and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and *** temperature,heat transfer rate,residence time,and type of feedstock are critical influential ***’s efficacy in managing contaminants relies on the pore size distribution,surface groups,and ion-exchange *** molecular composition and physical architecture of biochar may be crucial when practically applied to water and *** general,biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area,hydrophobicity and *** generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups,precipitation and electrostatic *** review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil.

关键词： Biochar Heavy metal ions Organic pollutants Water Soil

Orderly Porous Covalent Organic Frameworks-based Materials:Superior Adsorbents for Pollutants Removal from Aqueous Solutions

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The Innovation 2021年第1期2卷 106-134页

作者： Xiaolu Liu Hongwei Pang Xuewei Liu Qian Li Ning Zhang Liang Mao muqing qiu Baowei Hu Hui Yang Xiangke Wang School of Life Science Shaoxing UniversityHuancheng West Road 508Shaoxing 312000P.R.China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206P.R.China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093P.R.China

Covalent organic frameworks(COFs)are a new type of crystalline porous polymers known for chemical stability,excellent structural regularity,robust framework,and inherent porosity,making them promising materials for capturing various types of pollutants from aqueous *** review thoroughly presents the recent progress and advances of COFs and COF-based materials as superior adsorbents for the efficient removal of toxic heavy metal ions,radionuclides,and organic *** about the interaction mechanisms between various pollutants and COF-based materials are summarized from the macroscopic and microscopic standpoints,including batch experiments,theoretical calculations,and advanced spectroscopy *** adsorption properties of various COF-based materials are assessed and compared with other widely used *** commonly used strategies to enhance COF-based materials’adsorption performance and the relationship between structural property and sorption ability are also ***,a summary and perspective on the opportunities and challenges of COFs and COF-based materials are proposed to provide some inspiring information on designing and fabricating COFs and COF-based materials for environmental pollution management.

关键词： covalent organic frameworks(COFs) heavy metal ions radionuclides organic pollutants interaction mechanism

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花生壳生物炭–黏土吸附水中的Cr(Ⅵ)

无机材料学报 2020年第3期35卷 301-308页

作者：王海阳柠灿邱木清绍兴文理学院生命科学学院绍兴312000

重金属铬的污染会严重威胁到土壤和水体的环境安全,而水中的六价铬化合物则具有很强的迁移性、富集性和氧化性等特性,更具有危害性且难以处理。吸附法是一种能简单、高效地处理含重金属污水的处理技术。在磁力搅拌条件下采用花生壳生物... 详细信息

重金属铬的污染会严重威胁到土壤和水体的环境安全,而水中的六价铬化合物则具有很强的迁移性、富集性和氧化性等特性,更具有危害性且难以处理。吸附法是一种能简单、高效地处理含重金属污水的处理技术。在磁力搅拌条件下采用花生壳生物炭分别与高岭土和膨润土混合制备而成两种生物炭–黏土材料,并分别对这两种生物炭–黏土的表面特性进行表征。结果发现所选用的两种黏土均能不规则地负载在生物炭的表面。吸附实验结果显示,生物炭–高岭土(Biochar@Kaolin)吸附铬(Ⅵ)的能力显著高于生物炭–膨润土(Biochar@Bentonite)。从吸附动力学方程的分析可以看出,合成的两种生物炭负载黏土吸附水中的铬(Ⅵ)均符合伪二级动力学方程。从吸附等温线分析中可以得到,Biochar@Bentonite吸附铬(Ⅵ)的过程符合Langmuir模型,而Biochar@Kaolin吸附铬(Ⅵ)的过程符合Freundlich模型。研究结果显示,采用生物炭–黏土的复合材料修复环境中的重金属污染具有广阔的应用前景。

关键词：吸附花生壳黏土–生物炭铬(Ⅵ)

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生物法处理染料废水的研究与进展

工业水处理 2009年第2期29卷 19-21页

作者：冯凯邱木清绍兴文理学院生命科学学院浙江绍兴312000

染料废水是难处理的工业废水之一,其大量排放不仅对环境带来极大的影响,而且影响到人类的健康。近年来,研究采用生物方法处理该类废水取得了一定的成效,介绍了几种目前应用在处理该类废水的生物方法,并评述了各种处理方法的适用条件、... 详细信息

染料废水是难处理的工业废水之一,其大量排放不仅对环境带来极大的影响,而且影响到人类的健康。近年来,研究采用生物方法处理该类废水取得了一定的成效,介绍了几种目前应用在处理该类废水的生物方法,并评述了各种处理方法的适用条件、处理效果以及优缺点,提出生物技术将具有广阔的应用前景。

关键词：生物法染料废水好氧厌氧

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官员访问与企业投融资期限错配

财经研究 2019年第10期45卷 138-152页

作者：邱穆青白云霞华东理工大学商学院上海200237 同济大学经济与管理学院上海200082

文章基于2006-2012年官员访问上市公司的事件,利用PSM和DID方法,考察了官员访问对企业投融资期限错配的影响。研究发现,官员访问显著增加了被访企业,尤其是国有企业的投资水平和期限错配程度。这种效应与地区GDP增长压力正相关,而与管... 详细信息

文章基于2006-2012年官员访问上市公司的事件,利用PSM和DID方法,考察了官员访问对企业投融资期限错配的影响。研究发现,官员访问显著增加了被访企业,尤其是国有企业的投资水平和期限错配程度。这种效应与地区GDP增长压力正相关,而与管理层过度自信的倾向无关。这说明这种效应受到官员政绩激励的影响,而不是官员访问引起管理层过度自信所导致的。官员访问引起的投资往往是低效率的,并进一步加剧了未来的期限错配程度。文章研究表明,出于政绩和晋升诉求,官员可能会促使企业采用期限错配的激进策略进行无效率投资,以在短期内改善GDP表现。文章为认识中国制度背景下官员访问的动机和后果提供了一个新视角,也有助于从制度层面廓清中国企业普遍存在的投融资期限错配现象。

关键词：政府干预官员访问期限错配官员治理

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商业信用与中国工业企业出口扩张

世界经济 2016年第6期39卷 149-167页

作者：陆利平邱穆青湘潭大学商学院同济大学经济与管理学院

本文使用工业企业数据库和海关数据库的匹配数据,在企业-产品目的地-产品类别层面,基于出口特征考察了商业信用对出口的促进作用。我们的研究证实,商业信用对企业出口增长有显著的促进作用,并随着出口目的地距离的增加以及空运出口比例... 详细信息

本文使用工业企业数据库和海关数据库的匹配数据,在企业-产品目的地-产品类别层面,基于出口特征考察了商业信用对出口的促进作用。我们的研究证实,商业信用对企业出口增长有显著的促进作用,并随着出口目的地距离的增加以及空运出口比例的降低变得更为重要;同时,这种促进作用并未被银行融资所替代,且不受供应商来源、贸易形式以及供应商决策结算方式的影响,与目的地国家的金融发展程度及市场规模也不相关。本文的研究表明,商业信用对出口的促进作用,在于能有效地为出口扩张提供更多的营运资本融资。

关键词：商业信用企业出口信贷约束