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施氏矿物Schwertmannite的微生物法合成、鉴定及其对重金属的吸附性能
引用本文:周顺桂,周立祥,陈福星.施氏矿物Schwertmannite的微生物法合成、鉴定及其对重金属的吸附性能[J].光谱学与光谱分析,2007,27(2):367-370.
作者姓名:周顺桂  周立祥  陈福星
作者单位:南京农业大学资源与环境学院环境工程系,江苏,南京,210095
基金项目:国家自然科学基金 , 教育部新世纪优秀人才奖励计划项目 , 国际科学基金(IFS)
摘    要:在K- 缺乏的FeSO4-H2O体系(pH 2.5)中,利用氧化亚铁硫杆菌对亚铁的生物氧化作用,合成了一种新型羟基硫酸高铁矿物Schwertmannite(施氏矿物).借助扫描电镜(SEM)、x射线衍射(XRD)、傅里叶转换红外光谱(FTIR)、电感耦合等离子体原子发射光谱(ICP-AES)等方法对其组成和结构进行了分析与表征,同时还对其重金属吸附性能进行了研究.结果表明,A.ferrooxidans LX5休止细胞可在2 d内将在FeSO4-H2O体系中0.2 mol·L-1 Fe2 全部氧化成Fe3 ,溶液pH由起始的2.5下降至2.10,约有15%的Fd 被转化成红棕色沉淀,余下85%的Fe2 氧化后以Fe3 形式存在于溶液中.鉴定结果表明合成的红棕色羟基硫酸高铁沉淀为施氏矿物.吸附试验表明,施氏矿物对重金属阳离子Cu2 ,Zn2 与Cr3 的吸附受pH的控制,吸附率随pH的升高而增加,约在6.0~7.0时达到最大吸附率.当溶液中三种金属离子浓度为50mg·L-1时,最大吸持率分别为99.3%,99.4%与87.6%.

关 键 词:施氏矿物  合成  鉴定  氧化亚铁硫杆菌  重金属吸附
文章编号:1000-0593(2007)02-0367-04
收稿时间:2005-12-16
修稿时间:2006-03-26

Characterization and Heavy Metal Adsorption Properties of Schwertmannite Synthesized by Bacterial Oxidation of Ferrous Sulfate Solutions
ZHOU Shun-gui,ZHOU Li-xiang,CHEN Fu-xing.Characterization and Heavy Metal Adsorption Properties of Schwertmannite Synthesized by Bacterial Oxidation of Ferrous Sulfate Solutions[J].Spectroscopy and Spectral Analysis,2007,27(2):367-370.
Authors:ZHOU Shun-gui  ZHOU Li-xiang  CHEN Fu-xing
Institution:College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Abstract:An amorphous ferric hydroxysulfate named schwertmannite was synthesized by using bacterial oxidation of ferrous iron by resting A. ferrooxidans cells in acid ferrous sulfate solution (pH 2.5). The identification of the bacterially oxidized iron precipitate was carried out by SEM, XRD, FTIR and chemical analysis. Results showed that resting cells of A. ferrooxidans LX5 could completely oxidize ferrous ions to ferric ions in the FeSO4-H2O system after 2 days of incubation. The solution pH decreased from an initial 2.5 to 2.10, and about 15% of the ferrous iron was transformed into the red-brown precipitates. The subsequent characterization of the precipitates showed that the biotic, synthetic ferric hydroxysulfate was schwertmannite. Sorption edge measurement showed that the adsorption behavior of metal cations (e. g., Cu2+, Zn2+ and Cr3+) was pH-dependent. The adsorption increased with an increase in pH, and the maximum was found in a pH range of 6.0-7.0. For solution concentration of 50 mg x L(-1), the maximum adsorption efficiencies of Cu2+, Zn2+ and Cr3+ were 99.3%, 99.4% and 87.6%, respectively.
Keywords:Schwertmannite  Synthesis  Characterization  Acidithiobacillus ferrooxidans  Heavy metal adsorption
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