High-Performance Hg(II) Removal Using Thiol-Functionalized Polypyrrole (PPy/MAA) Composite and Effective Catalytic Activity of Hg(II)-Adsorbed Waste Material,ACS Sustainable Chemistry & Engineering

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High-Performance Hg(II) Removal Using Thiol-Functionalized Polypyrrole (PPy/MAA) Composite and Effective Catalytic Activity of Hg(II)-Adsorbed Waste Material
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-08-03 00:00:00 , DOI: 10.1021/acssuschemeng.7b00477
Raghunath Das ₁ , Somnath Giri ₁ , Anthony M. Muliwa ₂ , Arjun Maity _{1,

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Affiliation

Problems related with highly toxic mercury emissions from industrial effluents are one of the great concerns in the world of environmental science and technology. The primary aim of this present work is the remediation of hazardous pollutant Hg (II) from aqueous medium via a thiol-functionalized (mercaptoacetic acid) conducting polypyrrole (PPy/MAA) composite. The synthesized composite exhibited high Hg(II) adsorption capacity as the incorporated mercapto functionality plays a vital role for the strong binding affinity toward Hg(II) ions. To understand the adsorption properties of the developed polymer composite, a series of batch adsorption experiments were performed by altering the adsorption parameters. A maximum adsorption capacity (q_max) of 1736.8 mg/g at 25 °C was obtained using the Langmuir isotherm. The adsorption data showed better fitting to the pseudo-second-order rate equation for Hg(II) adsorption. A plausible adsorption mechanism is suggested on the basis of XPS results of major elements present in the adsorbent. To apply to catalytic reactions, the use of waste-derived mercury-adsorbed material (termed as PPy-MAA/Hg (II)) is also addressed here for further application of organic transformation. Here, we described the catalytic reaction with phenylacetylene in the presence of 5 mol % PPy-MAA/Hg (II) catalyst at 90 °C for 6 h. This method provides a straightforward formation of acetophenone in 55% yield. Thus, PPy/MAA not only effectively eliminates toxic Hg(II) ions from water but also is successfully applied for the catalytic organic transformation after adsorption.

中文翻译：

硫醇官能化聚吡咯（PPy / MAA）复合材料高效去除汞（II）和吸附汞（II）的废料的有效催化活性

与工业废水中剧毒的汞排放有关的问题是环境科学和技术界关注的重大问题之一。这项工作的主要目的是通过巯基官能化（巯基乙酸）导电聚吡咯（PPy / MAA）复合材料从水性介质中消除有害污染物Hg（II）。合成的复合材料显示出高的Hg（II）吸附能力，因为掺入的巯基官能团对Hg（II）离子具有很强的结合亲和力。为了了解所开发的聚合物复合材料的吸附性能，通过更改吸附参数进行了一系列分批吸附实验。最大吸附容量（q_最大值使用Langmuir等温线在25°C下获得1736.8 mg / g的）。吸附数据显示对Hg（II）吸附的拟二级速率方程更好地拟合。根据吸附剂中主要元素的XPS结果，提出了合理的吸附机理。为了应用于催化反应，此处还探讨了使用废物衍生的汞吸附材料（称为PPy-MAA / Hg（II））来进一步应用有机转化。在这里，我们描述了在90℃下在5 mol％PPy-MAA / Hg（II）催化剂存在下与苯乙炔的催化反应6小时。该方法以55％的产率提供了苯乙酮的直接形成。因此，PPy / MAA不仅可以有效地从水中消除有毒的Hg（II）离子，而且还可以成功地应用于吸附后的催化有机转化。

更新日期：2017-08-03

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