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首页> 外文期刊>Chemical engineering journal >Enhancement of heavy metals removal by microbial flocculant produced by Paenibacillus polymyxa combined with an insufficient hydroxide precipitation
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Enhancement of heavy metals removal by microbial flocculant produced by Paenibacillus polymyxa combined with an insufficient hydroxide precipitation

机译：Paenibacillus Mationyxa产生的微生物絮凝剂加上重金属去除的重金属加强与氢氧化物沉淀不足的微生物絮凝剂

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摘要

The microbial flocculants (MBFs) hold the potential of biosorption to removal the heavy metals. However, it remains unclear what the relationship between biosorption and bioflocculation. Here, during the hydroxide precipitation of Cu, Zn, Pb and Cd, besides the commonly used pH, a three-phase division of zeta potential curves provided an orientation for the addition of MBFs. The plateau phase of zeta potential, indicating an insufficient hydroxide precipitation, was appropriate for introducing MBFGA1, a polysaccharide-based MBF. Its removal capacities on Cu, Zn, Pb and Cd reached the highest of 250 mg/g, 96.7 mg/g, 551.1 mg/g and 233.3 mg/g, respectively. A sufficiently suspended hydroxide precipitates of Pb could receive a higher dosage of MBFGA1, ensure their thorough separation, and finally improve the removal efficiency. In order to further control the residual risk of MBFGA1, the response surface methodology (RSM) was employed to optimize this process. The compromised results improved the Pb removal rate to 98% in a weak acidic solution at pH 6.2. The precipitates composition and crystallinity, the functional groups and the molecular morphology were characterized by the X-ray diffraction (XRD), fourier transform-infrared spectra (FTIRs) and atomic force microscopy (AFM), respectively. The results indicated that the negatively-charged hydroxyl, carbonyl, amino and phosphoryl played the significant roles on fixing the molecular of MBFGA1 on the precipitates, providing the points for the aggregation of flocs, and capturing the residual Pb ions. The insufficient hydroxide precipitation laid the foundation for these multiple functions of MBFGA1, and promoted the synergistic effects between biosorption and bioflocculation.
机译：微生物絮凝剂（MBFS）保持生物吸附的可能性以除去重金属。然而，仍然尚不清楚生物吸附与生物絮凝之间的关系。这里，在Cu，Zn，Pb和Cd的氢氧化物沉淀过程中，除了常用的pH之外，Zeta电位曲线的三相分裂提供了添加MBF的取向。表明氢氧化物沉淀不足的ζ电位的平台相适合于引入MBFGA1，一种基于多糖的MBF。其在Cu，Zn，Pb和Cd上的去除能力分别达到250mg / g，96.7mg / g，551.1mg / g和233.3mg / g的最高。足够悬浮的氢氧化物沉淀物的Pb可以获得更高剂量的MBFGA1，确保它们彻底分离，最终提高去除效率。为了进一步控制MBFGA1的残余风险，采用响应面方法（RSM）来优化该过程。受损结果在pH6.2的弱酸溶液中改善了Pb去除率至98％。通过X射线衍射（XRD），傅里叶变换 - 红外光谱（FTIRS）和原子力显微镜（AFM）以沉淀物组成和结晶度，官能团和分子形态分别表征。结果表明，带负电荷的羟基，羰基，氨基和磷植物在将MBFGA1的分子上进行了显着的作用，该致沉淀物的分子，提供了絮凝物的聚集点，并捕获残留的PB离子。氢氧化物沉淀不足奠定了MBFGA1的这些多功能的基础，并促进了生物吸附和生物絮凝之间的协同效应。

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  • 来源
    《Chemical engineering journal》 |2019年第2019期|共15页
  • 作者

    Huang Jing; Huang Zhong-Liang; Zhou Jin-Xing; Li Chang-Zhu; Yang Zhao-Hui; Ruan Min; Li Hui; Zhang Xuan; Wu Zi-Jian; Qin Xiao-Li; Hu Jia-Hui; Zhou Kang;

  • 作者单位

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Beijing Forestry Univ Key Lab State Forestry Adm Soil &

    Water Conservat Jianshui Res Stn Beijing 100083 Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

    Changsha Univ Sci &

    Technol Sch Energy &

    Power Engn Changsha 410076 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol &

    Environm Engn Changsha 410004 Hunan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    Heavy metal; Microbial flocculant; Hydroxide precipitation; Zeta potential; Bioflocculation; Biosorption;

    机译：重金属;微生物絮凝剂;氢氧化沉淀;Zeta潜力;生物絮凝;生物吸附;

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