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Catalytic mechanism of manganese ions and visible light on chalcopyrite bioleaching in the presence of acidithiobacillus ferrooxidans

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Chinese Journal of Chemical Engineering 2022年第1期35卷 457-465页

作者： Chunxiao Zhao Baojun Yang Rui Liao Maoxin Hong Shichao Yu Jun Wang Guanzhou Qiu Key Laboratory of Biohydrometallurgy of Ministry of Education School of Minerals Processing&BioengineeringCentral South UniversityChangsha 410083China

The bioleaching of chalcopyrite is low cost and environmentally friendly,but the leaching rate is low.To explore the mechanism of chalcopyrite bioleaching and improve its leaching rate,the effect and mechanism of manganese ions(Mn^(2+))and visible light on chalcopyrite mediated by acidithiobacillus ferrooxidans(A.ferrooxidans)were discussed.Bioleaching experiments showed that when both Mn^(2+)and visible light were present,the copper extraction was 14.38%higher than that of the control system(without Mn^(2+)and visible light).Moreover,visible light and Mn^(2+)promoted the growth of A.ferrooxidans.Scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS)analysis revealed that Mn^(2+)promoted the formation of extracellular polymeric substance(EPS)on the surface of chalcopyrite,changed the morphology of A.ferrooxidans,enhanced the adsorption of bacteria on chalcopyrite surface with light illumination,and thus promoted the bioleaching of chalcopyrite.UV–vis absorbance spectra indicated that Mn^(2+)promoted the response of chalcopyrite to visible light and enhanced the catalytic effect of visible light on chalcopyrite bioleaching.Based on X-ray photoelectron spectroscopy(XPS),the relevant sulfur speciation of chalcopyrite before and after bioleaching were analyzed and the results revealed that visible light and Mn^(2+)promoted chalcopyrite bioleaching by reducing the formation of passivation layer(S_(n)^(2-)/S0).Investigation into electrochemical results further indicated that Mn^(2+)and visible light improved the electrochemical activity of chalcopyrite,thus increasing the bioleaching rate.

关键词： acidithiobacillus ferrooxidans Mn^(2+) Electrochemistry Catalysis Dissolution

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Synthesis of plant-based biogenic jarosite nanoparticles using Azadirachta indica and Eucalyptus gunni leaf extracts and its application in Fenton degradation of dicamba

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Water Science and Engineering 2024年第2期17卷 157-165页

作者： Shivaswamy Bhaskar Basavaraju Manu Marikunte Yanjarappa Sreenivasa Arlapadavu Manoj Department of Civil Engineering National Institute of Technology CalicutKozhikode 673601KeralaIndia Deparment of Civil Engineering National Instute of Techogy KamatakaSurahalP.Srinivasnaga Mangaore5725Indi Department of Studies in Microbiology University of MysoreMysuru 570006KarnatakaIndia Department of Civil Enginering Siddaganga Institute of TechnologyTumkur 572103India

Bio-jarosite,an iron mineral synthesized biologically using bacteria,is a substitute for iron catalysts in the Fenton oxidation of organic pollutants.Iron nanocatalysts have been widely used as Fenton catalysts because they have a larger surface area than ordinary catalysts,are highly recyclable,and can be treated efficiently.This study aimed to explore the catalytic properties of bio-jarosite iron nanoparticles syn-thesized with green methods using two distinct plant species:Azadirachta indica and Eucalyptus gunni.The focus was on the degradation of dicamba via Fenton oxidation.The synthesized nanoparticles exhibited different particle size,shape,surface area,and chemical composition characteristics.Both particles were effective in removing dicamba,with removal efficiencies of 96.8%for A.indica bio-jarosite iron nano-particles(ABFeNPs)and 93.0%for E.gunni bio-jarosite iron nanoparticles(EBFeNPs)within 120 min of treatment.Increasing the catalyst dosage by 0.1 g/L resulted in 7.6%and 43.0%increases in the dicamba removal efficiency for EBFeNPs and ABFeNPs with rate constants of 0.025 min^(-1) and 0.023 min^(-1),respectively,confrming their catalytic roles.Additionally,the high efficiency of both catalysts was demonstrated through five consecutive cycles of linear pseudo-first-order Fenton oxidation reactions.

关键词： acidithiobacillus ferrooxidans Fenton process Jarosite Herbicide Dicamba Azadirachta indica Eucalyptus gunni

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Mechanism of electro-generative-leaching of chalcopyrite-MnO_2 in presence of acidithiobacillus ferrooxidans

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Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 15-20页

作者：肖利方正邱冠周王少芬王春雄 School of Chemistry and Chemical Engineering Central South University School of Resources Processing and Bioengineering Central South University College of Chemistry and Biological Engineering Changsha University of Science and Technology College of Metallurgic Engineering Hunan Un iversity of Technology

To clarify the role and mechanism of acidithiobacillus ferrooxidans (A. ferrooxidans) in bio-electro-generative-leaching (BEGL), an experiment was made on the electro-generative leaching of chalcopyrite-MnO2 in the presence of the bacteria which grew respectively in Fe(Ⅱ) and S0 media. A dual cell system with chalcopyrite anode and MnO2 cathode was used to study the relationship between time and both of electric quantity and dissolved rate of the two minerals in BEGL. The results show that the dissolved rates for Cu2+ and Fe2+ under the action of the bacteria cultivated by S0 medium are almost 2 times faster than those by Fe(Ⅱ). And the leaching ratio for Mn2+ and the electric output increase by near 3 times. The oxidation residue of chalcopyrite was characterized by SEM and XRD, whose patterns are similar to those of raw ore in BEGL. The mechanism of anodic reaction for CuFeS2-MnO2 leaching in the presence of A. ferrooxidans cultivated by S0 medium is proposed as a successive reaction of two independent sub-processes. The first stage is the dissolution of chalcopyrite to produce Cu2+, Fe2+ and sulfur, and the second stage is bio-oxidation of sulfur, which is the control step of the process. However, dissolution of MnO2 lasts until the reaction of chalcopyrite stops or the ores exhaust in two types of leaching.

关键词： chalcopyrite MnO2 acidithiobacillus ferrooxidans bio-oxidation electro-generative-leaching

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Microbiologically influenced corrosion of cable bolts in underground coal mines:The effect of acidithiobacillus ferrooxidans

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International Journal of Mining Science and Technology 2021年第3期31卷 357-363页

作者： H.Chen O.Kimyon H.Lamei Ramandi M.Manefield A.H.Kaksonen C.Morris A.Crosky S.Saydam School of Materials Science and Engineering UNSW SydneyNSW 2052Australia School of Chemical Engineering UNSW SydneyNSW 2052Australia School of Minerals and Energy Resources Engineering UNSW SydneyNSW 2052Australia CSIRO Land and Water FloreatWA 6014Australia

Reports on corrosion failure of cable bolts,used in mining and civil industries,have been increasing in the past two decades.The previous studies found that pitting corrosion on the surface of a cable bolt can initiate premature failure of the bolt.In this study,the role of acidithiobacillus ferrooxidans(A.ferrooxidans)bacterium in the occurrence of pitting corrosion in cable bolts was studied.Stressed coupons,made from the wires of cable bolts,were immersed in testing bottles containing groundwater collected from an underground coal mine and a mixture of A.ferrooxidans and geomaterials.It was observed that A.ferrooxidans caused pitting corrosion on the surface of cable bolts in the near-neutral environment.The presence of geomaterials slightly affected the p H of the environment;however,it did not have any significant influence on the corrosion activity of A.ferrooxidans.This study suggests that the common bacterium A.ferrooxidans found in many underground environments can be a threat to cable bolts'integrity by creating initiation points for other catastrophic failures such as stress corrosion cracking.

关键词： Cable bolt failure Microbiologically influenced corrosion acidithiobacillus ferrooxidans

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Bio-oxidation of galena particles by acidithiobacillus ferrooxidans

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Particuology 2008年第2期6卷 99-105页

作者： Lei Jiang Huaiyang Zhou Xiaotong Peng Zhonghao Ding Wuhan University of Science & Engineering Wuhan 430073 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

This paper deals with the bio-oxidation of galena particles （-80 meshes） using acidithiobacillus ferrooxidans and compares it with Fe^3＋ oxidation. Experimental results show that, at least, 0.00197 mol galena was leached from lOOmL pulp （density of 3.8%） with 39 days＇ bio-oxidation, as compared to 0.00329 mol galena by Fe^3＋ with 9 days＇ oxidation. Because Fe^3＋ was constantly consumed, leaching by Fe^3＋ almost stopped after 9 days. Large amounts of lead sulfate were detected in both bio-oxidation and Fe^3＋ oxidation of galena. A. ferrooxidans followed a unique growth pattern during the bio-oxidation of galena. In the initial 15 days, the bacteria attached themselves to the galena surface with the formation of erosion pits similar in shape and length to those of the bacteria, and there were hardly any bacteria suspended in the solution. After 15 days, suspended bacteria increased. It is thus suggested that A. ferrooxidans may directly oxidize galena.

关键词： acidithiobacillus ferrooxidans Galena Bio-oxidation

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不同能源适应的acidithiobacillus ferrooxidans与黄铜矿和黄铁矿的相互作用

不同能源适应的Acidithiobacillus ferrooxidans与黄铜矿和黄铁矿...

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作者：王乾芬中南大学

学位级别：硕士

本文研究了FeSO4·7H2O.硫、黄铜矿或黄铁矿适应的acidithiobacillus ferrooxidans分别与黄铜矿及黄铁矿之间的相互作用。通过接触角、Zeta电位、傅立叶红外光谱和酸碱滴定实验来分析细菌及矿物的表面性质,使用热力学方法和extended-DLV... 详细信息

本文研究了FeSO4·7H2O.硫、黄铜矿或黄铁矿适应的acidithiobacillus ferrooxidans分别与黄铜矿及黄铁矿之间的相互作用。通过接触角、Zeta电位、傅立叶红外光谱和酸碱滴定实验来分析细菌及矿物的表面性质,使用热力学方法和extended-DLVO理论来计算和预测细菌EPS缺损前后与矿物之间的相互作用能,借助原子力显微镜（AFM）测量细菌EPS缺损前后与矿物之间的相互作用力,监测2小时内细菌在矿物表面的吸附行为,并通过假一级和假二级动力学模型模拟细菌在矿物表面的吸附情况。对比细菌与矿物之间相互作用的差异来揭示细菌在矿物表面吸附的本质,探讨extended-DLVO理论预测细菌在矿物表面的吸附情况与AFM测得的吸附力以及吸附实验和模拟获得的细菌吸附行为之间的关系,细菌的表面性质与其吸附力之间的关系,进一步完善细菌-矿物相互作用的机制,为后续生物浸出创造更加有利的条件不同能源适应的细菌EPS缺损前后以及矿物的表面性质分析可知,在无铁9K培养基中,黄铁矿的负Zeta电位低于黄铜矿的负电位;黄铜矿的接触角大于黄铁矿的接触角。不同能源适应的细菌的电位是正值;接触角有差异;表面基团无差异,而EPS的量有所不同;影响NaCl溶液缓冲性质的程度不同。EPS缺损的细菌表面性质发生变化。结果表明细菌的表面性质受EPS的影响,而EPS性质受细菌适应的底物影响。 Extend-DLVO理论预测结果表明,细菌与黄铜矿之间的总势能的主要贡献来自于范德华相互作用势能（GLw）,细菌与黄铁矿之间的总势能的主要贡献来自于静电相互作用势能（GEL）和范德华相互作用势能（GLW）。EPS缺损后的细菌仍可以吸附到黄铜矿表面,但是相比较未处理的细菌会更难一些。EPS缺损后的细菌需要跨越能嶂才能吸附到黄铁矿表面。根据extend-DLVO理论预测细菌吸附到黄铜矿表面比吸附到黄铁矿表面要容易。对比细菌分别与黄铜矿和黄铁矿之间的力-距离曲线,细菌与黄铁矿之间的吸附力更大一些,且不同能源适应的细菌与同一种矿物之间的吸附力也存在差异,这表明细菌表面性质和矿物的类型共同决定着细菌与矿物之间的相互作用力。对比不同能源适应的细菌与同种矿物之间的力-距离曲线,矿物适应的细菌与矿物之间的吸附力最大,其次是硫适应的细菌,最小的是FeSO4·7H2O适应的细菌。结合接触角和Zeta电位实验,我们可以推出在细菌吸附到黄铜矿表面的过程中,疏水力起主导作用,而在细菌吸附到黄铁矿表面的过程中,静电力起主导作用。EPS缺损的细菌与矿物之间的吸附力变小,这是由于EPS缺损的细菌的表面电荷、接触角和胞外聚合物的变化引起的。吸附实验表明细菌吸附到黄铁矿表面的数量大于其吸附到黄铜矿表面的数量。对同一种矿物来说,矿物适应的细菌吸附到矿物表面的数量最大,其次是硫适应的细菌,FeSO4·7H2O适应的细菌的吸附量最小。EPS缺损的细菌比未处理的细菌的吸附量更小。使用假一级动力学模型和假二级动力学模型模拟了细菌在矿物表面的吸附情况,无论从吸附速率还是吸附能力方面,矿物适应的细菌都是最大的,其次是硫适应的细菌,FeSO4·7H2O适应的细菌最小。EPS缺损的细菌吸附速率和吸附能力均有所减小,这些结果表明细菌的吸附性质严重受细菌表面性质的影响。

关键词： acidithiobacillus ferrooxidans 黄铜矿黄铁矿 extend-DLVO 原子力显微镜吸附

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Inhibition of hematite on acid mine drainage caused by chalcopyrite biodissolution

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Chinese Journal of Chemical Engineering 2022年第4期35卷 94-104页

作者： Baojun Yang Wen Luo Maoxin Hong Jun Wang Xueduan Liu Min Gan Guanzhou Qiu School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Biohydrometallurgy Ministry of EducationCentral South UniversityChangsha 410083China Department of Dermatology The First Hospital of ChangshaChangsha 410005China

Even though biodissolution of chalcopyrite is considered to be one of the key contributors in the formation of acid mine drainage(AMD),there are few studies to control AMD by inhibiting chalcopyrite biodissolution.Therefore,a novel method of using hematite to inhibit chalcopyrite biodissolution was proposed and verified.The results indicated that chalcopyrite biodissolution could be significantly inhibited by hematite,which consequently decreased the formation of AMD.In the presence of hematite,the final biodissolution rate of chalcopyrite decreased from 57.9%to 44.4%at 20 day.This in turn suggested that the formation of AMD was effectively suppressed under such condition.According to the biodissolution results,mineral composition and morphology analyses,and electrochemical analysis,it was shown that hematite promoted the formation and accumulation of passivation substances(jarosite and Cu2-xS)on chalcopyrite surface,thus inhibiting the biodissolution of chalcopyrite and limiting the formation of AMD.

关键词： Chalcopyrite Hematite Biodissolution Acid mine drainage acidithiobacillus ferrooxidans

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Bioimpatibility study of magnetosomes formed by acidithiobacillus ferrooxidans

Bioimpatibility study of magnetosomes formed by Acidithiobac...

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第三届全国微生物资源学术暨国家微生物资源平台运行服务研...

作者： Lei Yan a,b,Shuang Zhang b,Peng Chen c,Xiaoxuan Yue a,Yang Li a,Zhiliang Xu a,Hongyu Li a,a MOE Key Laboratory of Arid and Grassland Ecology,School of Life Sciences,Lanzhou University,Lanzhou,730000,PR China b College of Life Science and Technology,Heilongjiang Bayi Agricultural University,Daqing,163319,PR China c GIBT,Gansu Institute of Business and Technology,South of the City Beach 268,Lanzhou,730010,PR China

Magnetotactic bacteria（MTB） are motile prokaryotes that have the ability to propel along geomagnetic field lines.Hallmarks of MTB are intracellular magnetosomes,which are magnetic crystals of either iron oxide,magnetite（Fe3O4）,or iron sulfide,greigite（Fe3S4） or iron pyrite（FeS2） enveloped by a phospholipid bilayer membrane.It has been reported that acidithiobacillus ferrooxidans（At.ferrooxidans） is able to produce magnetosomes.In comparison with fastidious magnetotactic bacteria,At.ferrooxidans can grow without the drastic regimes of oxidative stress,and the mass cultivation of this bacteria has been easily available.Although there is extensive literature on the biocompatibility of chemosynthetic magnetite nanocrystal,much less information on the biocompatibility of biosynthetic magnetite nanocrystal is available.In the present work,the orthogonal design of experiment was used to optimize the condition of At.ferrooxidans growth and magnetosomes synthesizing.The results indicated that the optimized conditions of At.ferrooxidans growth and magnetosomes synthesizing were not identical.The optimized conditions for the growth of At.ferrooxidans were found to be:FeSO4 120 mM,（NH4）2SO4 3.0 g/L,temperature 30 oC,initial pH 1.75,and 20% loadings.However,the optimized conditions for magnetosomes synthesizing of At.ferrooxidans were found to be:FeSO4 160 mM,（NH4）2SO4 2.4 g/L,temperature 20 oC,initial pH 1.75,and 50% loadings.Initial purification of the magnetosomes can be accomplished by washing eight to ten times with HEPES buffer,along with lysozyme treatment,low-temperature ultrasonication,and magnet collection.We investigated the properties of magnetosomes produced by At.ferrooxidans in detail,such as crystalline phase,vitro cytotoxicity,blood compatibility,genotoxicity and primary functional group on the magnetosomes membrane surface.Transmission electron microscopy（TEM） revealed that the number of magnetosomes in single bacterial cell is about 2.The X-ray diffraction（XRD） assay indicated that the magnetic nanocrystal

关键词： Magnetotactic bacteria acidithiobacillus ferrooxidans Magenetosomes Biocompatibility Hemolysis assay Micronucleus Test

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Response of mpsA gene involved in magmetosome formation to different treatment in acidithiobacillus ferrooxidans

Response of mpsA gene involved in magmetosome formation to d...

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第四届全国微生物资源学术暨国家微生物资源平台运行服务研...

作者： Lei Yan1,Shuang Zhang1,Peng Chen2,Hongyu Li2(1 College of Life Science and Technology,Heilongjiang Bayi Agricultural University,Daqing,163319 2 School of Life Sciences,Lanzhou University,Lanzhou,730000)

Magnetotactic bacteria（MTBs） are a heterogeneous group of aquatic prokaryotes with a unique intracellular organelle,the magnetosome,which orients the cell along magnetic field lines.It has been reported that the magnetosomes comprise nanometer-sized,membrane bound crystals of magnetic iron minerals and organized into chains via a dedicated cytoskeleton in most MTB.Because of the special properties of the magnetosomes,MTB are of great interest in microbiology,geology,mineralogy and biomineralization,crystallography,chemistry,biochemistry,physics,limnology and oceanography,and even astrobiology.Despite the ubiquitous occurrence of MTB and their high abundance in natural habitats,the isolation and cultivation of MTB are difficult due to their fastidious lifestyle.Because of this,the number of researchers working in this field was few and progress was slow.Recently,it has been reported that there are many similar properties between acidithiobacillus ferrooxidans（At.ferrooxidans） and MTBs,such as distribution,morphological types,motility,Gram stain,trophic type,medium composition,requiring oxygen type and growth temperature.It has been revealed that At.ferrooxidans is able to synthesize intracellular electron dense magnetite but the magnetotaxis of which is very weak.Our previous study also showed that the magnetosomes were biomineralized in At.ferrooxidans and the isolated magnetosomes possess high good biocompatibility.In contrast to other MTBs,the information available on the synthesize mechanism of magnetosome of At.ferrooxidans is very sparse.In this work,38 genes （magA,mamA,mamB,mamC,mamD,mamE,mamF,mamG,mamH,mamI,mamJ,mamK,mamL,mamM,mamN,mamO,mamP,mamQ,mamR,mamS,mamT,mamU,mamW,mgI462,mam12（mamC）,mam22（mamA）,mm22,mms5,mms6（mamD）,mmS7（mamD）,mmsl3（mamC）,mmsl6,mms24（mamA）,mmsF,mpsA,thy,bfr1 and bfr2） involved in the biomineralization of magnetosomes were collected,and the sequences were compared with the whole genome of type strain At.ferrooxidans ATCC 23270 by bioinformatics.Temporal expression profiles of mpsA gen

关键词： acidithiobacillus ferrooxidans magnetosome mpsA gene magnetic field intensity bioinformatics

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Effects of operating parameters on bioleaching of realgar by acidithiobacillus ferrooxidans

Effects of operating parameters on bioleaching of realgar by...

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第三届全国微生物资源学术暨国家微生物资源平台运行服务研...

作者： Peng Chen a,b,Lei Yan a,c,Qiang Wang d,Wenbing Nan a,Yang Li a,Hongyu Li a,a MOE Key Laboratory of Arid and Grassland Ecology,School of Life Sciences,Lanzhou University,Tianshui Road No.222,Lanzhou,730000,PR China b GIBT,Gansu Institute of Business and Technology,High-Tech Industrial Development Zone Innovation Park,Yannan Road No.18,Lanzhou 730010,PR China c College of Life Science and Technology,Heilongjiang Bayi Agricultural University,Daqing,163319,PR China d College of Chemistry and Chemical Engineering,Lanzhou University,Tianshui Road No.222,Lanzhou,730000,PR China

Realgar is a naturally occurring arsenic sulfide that is also called red arsenic（or Xionghuang,in Chinese） due to its deep red color.It contains over 90% tetra-arsenic tetra-sulfide（As4S4）.However,disadvantages such as low solubility in water,poor gastrointestinal absorption,high toxicity,and poor bioavailability have seriously limited clinical applications of realgar.By taking advantage of an arsenic-resistant strain of indigenous acidithiobacillus ferrooxidans（A.ferrooxidans）,we succeeded in the development of a novel method for realgar preparation by bioleaching processes.However,little is known about the bioleaching of realgar using A.ferrooxidans under various conditions due to lack of thorough studies.The parameter optimization of biological processes that is significant novelty and scientific impact for realgar’s clinical use.The fundamental knowledge derived from this study should provide new insights into and novel applications for preparation of realgar.We are interested to obtain optimal conditions in order to enhance realgar dissolution.These factors are worthy of study include temperature,pH,bacteria population,concentration of ferrous iron,and pulp density.The primary aims of this paper were investigated to evaluate environmental parameters for bioleaching of arsenic from realgar using A.ferrooxidans.The behavior of A.ferrooxidans in response to different leaching conditions was investigated in a series of batch experiments.The bacterial leaching of realgar has been investigated using A.ferrooxidans.The effects of a range of crucial operational parameters,including temperature,pH values,bacteria population,ferrous iron concentration,and pulp density on the efficiency of the bioleaching process were investigated.Conversion algorithms were applied to test the experimental data from the bioleaching of realgar.The experimental data on realgar conversion were analyzed and simulated by mathematical models.The results validated that the linear models were well fitted to the experimental data,while the corr

关键词： acidithiobacillus ferrooxidans realgar optimum mathematical models

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