Immobilization of Hg(II) in water with polysulfide-rubber (PSR) polymer-coated activated carbon
Immobilization of Hg(II) in water with polysulfide-rubber (PSR) polymer-coated activated carbon
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DOI：
10.1016/j.watres.2010.08.045
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发表时间：
2011-01-01
期刊：
影响因子：
12.8
通讯作者：
Luthy, Richard G.
中科院分区：
文献类型：
--
作者：
Kim, Eun-Ah;Seyfferth, Angelia L.;Luthy, Richard G.
研究了聚合物包覆活性炭在水处理中的有效除汞方法。为了提高活性炭对汞的亲和力，在活性炭表面涂覆了一种富硫化合物聚硫橡胶（PSR）聚合物。该聚合物由四硫化钠和1,2-二氯乙烷在水中缩聚合成。通过x射线光电子能谱和傅里叶变换红外光谱分析，阐明了psr -汞相互作用和Hg-S成键。在包覆过程中，硫负载水平由聚合物剂量控制，并使活性炭的总表面积保持在硫负载小于2 wt%。吸附动力学研究表明，与单独的PSR相比，PSR涂层活性炭提供了更大的反应表面积，从而促进了快速反应。活性炭上的高硫负荷增强了汞的吸附，有助于汞浓度降低三个数量级。汞与活性炭和活性炭上的PSR结合的mu- x射线吸收近边光谱分析表明，汞与活性炭表面的化学键是Hg-Cl和Hg-S相互作用的组合。pH对汞去除和等温线吸附的影响表明，在低pH下，质子和汞会竞争与硫的结合(c) 2010。
An effective mercury removal method using polymer-coated activated carbon was studied for possible use in water treatment. In order to increase the affinity of activated carbon for mercury, a sulfur-rich compound, polysulfide-rubber (PSR) polymer, was effectively coated onto the activated carbon. The polymer was synthesized by condensation polymerization between sodium tetrasulfide and 1,2-dichloroethane in water. PSR-mercury interactions and Hg-S bonding were elucidated from x-ray photoelectron spectroscopy, and Fourier transform infra-red spectroscopy analyses. The sulfur loading levels were controlled by the polymer dose during the coating process and the total surface area of the activated carbon was maintained for the sulfur loading less than 2 wt%. Sorption kinetic studies showed that PSR-coated activated carbon facilitates fast reaction by providing a greater reactive surface area than PSR alone. High sulfur loading on activated carbon enhanced mercury adsorption contributing to a three orders of magnitude reduction in mercury concentration. mu-X-ray absorption near edge spectroscopic analyses of the mercury bound to activated carbon and to PSR on activated carbon suggests the chemical bond with mercury on the surface is a combination of Hg-Cl and Hg-S interaction. The pH effect on mercury removal and adsorption isotherm results indicate competition between protons and mercury for binding to sulfur at low pH. (c) 2010 Published by Elsevier Ltd.