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首页> 外文期刊>Journal of Hazardous Materials >Biomineralization of Pb(II) into Pb-hydroxyapatite induced by Bacillus cereus 12-2 isolated from Lead-Zinc mine tailings
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Biomineralization of Pb(II) into Pb-hydroxyapatite induced by Bacillus cereus 12-2 isolated from Lead-Zinc mine tailings

机译：铅锌矿尾矿分离的蜡状芽孢杆菌12-2诱导Pb（II）生物矿化成Pb-羟基磷灰石

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摘要

The remediation of Pb(II) through biomineralization is rergarded as a promising technique as well as an interesting phenomenon for transforming heavy metals from mobile species into very stable minerals in the environment Studies are well needed for in-depth understanding the mechanism of Pb(II) immobilized by bacteria. In the present study, we investigated the uptake and biomineralization of Pb(II) using Bacillus cereus 12-2 isolated from lead-zinc mine tailings. The maximum Pb(II) uptake capacity of B. cereus 12-2 was 340 mg/g at pH 3.0. Zeta potential analyses and selective passivation experiments demonstrated that electrostatic attraction was the main force driving the uptake of Pb(II), while the carboxyl, amide and phosphate functional groups of the bacteria provided the binding sites for immobilizing Pb(II). XRD and TEM investigation revealed that the Pb(II) loaded on bacteria could be stepwise transformed into rod-shaped Ca2.5Pb7.5(OH)(2)(PO4)(6) nanocrystal. Combined with protein denaturalization experiments, we proposed that the biomineralization of Pb(II) possibly consisted of two steps: (1) Rapid biosorption of Pb(II) on B. cereus 12-2 through the synergy of electrostatic attraction, ionic exchange and chelating activity of functional groups; (2) enzyme-mediated mineral transformation from amorphous precipitate to rod-shaped crystalline minerals happening gradually inside the bacteria. (C) 2015 Elsevier B.V. All rights reserved.
机译：通过生物矿化修复Pb（II）被认为是一种有前途的技术，也是一种有趣的现象，可用于在环境中将重金属从活动物种转化为非常稳定的矿物质深入研究Pb（II）的机理非常需要研究。 ）被细菌固定。在本研究中，我们调查了使用从铅锌矿尾矿中分离的蜡状芽孢杆菌12-2对Pb（II）的吸收和生物矿化作用。在pH 3.0时，蜡状芽孢杆菌12-2的最大Pb（II）吸收能力为340 mg / g。 Zeta电位分析和选择性钝化实验表明，静电吸引是驱动Pb（II）吸收的主要力量，而细菌的羧基，酰胺和磷酸官能团则提供了固定Pb（II）的结合位点。 XRD和TEM研究表明，负载在细菌上的Pb（II）可以逐步转化为棒状Ca2.5Pb7.5（OH）（2）（PO4）（6）纳米晶体。结合蛋白质变性实验，我们认为Pb（II）的生物矿化可能包括两个步骤：（1）通过静电吸引，离子交换和螯合的协同作用，在蜡状芽孢杆菌12-2上快速吸附Pb（II）。官能团的活性； （2）酶介导的矿物质从无定形沉淀物向棒状结晶矿物质的转化逐渐在细菌内部发生。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2016年第15期|531-537|共7页
  • 作者

    Chen Zhi; Pan Xiaohong; Chen Hui; Guan Xiong; Lin Zhang;

  • 作者单位

    Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Design & Assembly Funct Nanostruct, Fuzhou 350002, Peoples R China|Fujian Agr & Forestry Univ, Minist Educ, Key Lab Biopesticide & Chem Biol, Fuzhou 350002, Peoples R China|Fujian Taiwan Joint Ctr Ecol Control Crop Pests, Fuzhou 350002, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Design & Assembly Funct Nanostruct, Fuzhou 350002, Peoples R China|Fujian Agr & Forestry Univ, Minist Educ, Key Lab Biopesticide & Chem Biol, Fuzhou 350002, Peoples R China|Fujian Taiwan Joint Ctr Ecol Control Crop Pests, Fuzhou 350002, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Design & Assembly Funct Nanostruct, Fuzhou 350002, Peoples R China;

    Fujian Agr & Forestry Univ, Minist Educ, Key Lab Biopesticide & Chem Biol, Fuzhou 350002, Peoples R China|Fujian Taiwan Joint Ctr Ecol Control Crop Pests, Fuzhou 350002, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Design & Assembly Funct Nanostruct, Fuzhou 350002, Peoples R China|S China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bacillus cereus; Biosorption; Biomineralization; Lead;

    机译：蜡状芽孢杆菌;生物吸附;生物矿化;铅;

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