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首页> 外文期刊>RSC Advances >Remediation of chromium(III)-contaminated tannery effluents by using gallic acid-conjugated magnetite nanoparticles
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Remediation of chromium(III)-contaminated tannery effluents by using gallic acid-conjugated magnetite nanoparticles

机译：用Gallic酸缀合的磁铁矿纳米粒子来修复铬（III） - 酰胺制革流出物

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摘要

Potential ecological risks of chromium(III) contaminates in tannery effluents have evoked considerable discussion and re-examination over the future role of chrome tannage, which has been long considered as the foundation of the modern leather industry. Despite previous magnetite-supported adsorbents for chromium removal, few of them were specifically engineered to address trivalent chromium, as well as the composition complexity in tannery effluents. Herein, gallic acid, a natural triphenolic compound capable of coordination to chromium(III), was covalently conjugated onto engineered magnetite nanoparticles via 1-ethyl-3-(3-dimethylaminepropyl) carbodiimide hydrochloride/N-hydroxysuccinimide (EDC/NHS) chemistry, in an effort to design a magnetically separable nanoadsorbent applicable for remediating chromium(III)-contaminated tannery effluents. The structure of the nanoadsorbent was systematically characterized by multiple techniques, and the influence of pH value, adsorbent dose, temperature, and leather-related co-existing substances on its chromium(III) removal potency was investigated, respectively. Also, kinetics, equilibrium, and thermodynamics studies were conducted to decipher the mechanism by which chromium(III) cations were adsorbed. Finally, the feasibility of treating real tannery effluents that also contained high concentrations of sulfides, chlorides, ammonium nitrogen, total suspended solids, chemical oxygen demand (CODCr), and biochemical oxygen demand (BOD) by using the nanoadsorbent designed herein was explored. It was found that the chromium(III) removal percentage was approximately 95.2 +/- 1.6%, and the exhausted nanoadsorbent could be conveniently separated from the effluents via a simple magnetic process. By chemical desorption, the nanoadsorbent was regenerable, and reusable for multiple cycles without a significantly compromised adsorption potency. According to these results, we aim at providing an efficient solution that may be a great addition to the ongoing fight against chromium(III) contamination in tannery effluents.
机译：铬（III）染色体的潜在生态风险在制革污水中诱发了相当大的讨论和重新检查，对铬鞣法的未来作用，这一直被认为是现代皮革行业的基础。尽管先前的磁铁矿支持的吸附剂用于铬去除，但其中很少有专门设计用于解决三价铬，以及制革流出物中的组成复杂性。本文中，能够与铬（III）配制的天然三酚化合物，通过1-乙基-3-（3-二甲胺丙基）碳二亚胺盐酸盐/ N-羟基琥珀酰亚胺（EDC / NHS）化学将具有与铬（III）配制的天然三酚化合物共价缀合。努力设计一种可用于修复铬（III）酰胺的制革流出物的磁性可分离的纳米胶囊。通过多种技术系统地表征了纳米彩色的结构，并分别研究了pH值，吸附剂剂量，温度和皮革相关的共同存在物质对其铬（III）去除效力的影响。此外，进行动力学，平衡和热力学研究以破译铬（III）阳离子被吸附的机制。最后，通过使用本文设计的纳米吸入剂，探讨了处理含有高浓度的硫化物，氯化物，氮，氮，总悬浮固体，化学需氧（CODCR）和生化需氧量（BOD）的实际制革污水的可行性。发现铬（III）除去百分比约为95.2 +/- 1.6％，并且可以通过简单的磁法方便地与流出物方便地分离出来的纳米造纸剂。通过化学解吸，纳米装载剂是可再生的，并且对于多个循环可重复使用而没有显着受损的吸附效力。根据这些结果，我们的目的是提供一种有效的解决方案，这可能是持续抗击铬（III）污染在制革流出物中的污染。

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  • 来源
    《RSC Advances》 |2016年第35期|共10页
  • 作者

    Guan Xiaoyu; Chang Jinming; Xu Zhou; Chen Yi; Fan Haojun;

  • 作者单位

    Sichuan Univ Minist Educ Key Lab Leather Chem &

    Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Minist Educ Key Lab Leather Chem &

    Engn Chengdu 610065 Peoples R China;

    Yibin Univ Solid State Fermentat Resource Utilizat Key Lab S Yibin 644007 Peoples R China;

    Sichuan Univ Minist Educ Key Lab Leather Chem &

    Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Minist Educ Key Lab Leather Chem &

    Engn Chengdu 610065 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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