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首页> 外文期刊>Separation and Purification Technology >Cationic-modified microporous zeolites/anionic polymer system for simultaneous removal of dissolved and colloidal substances from wastewater
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Cationic-modified microporous zeolites/anionic polymer system for simultaneous removal of dissolved and colloidal substances from wastewater

机译：阳离子改性的微孔沸石/阴离子聚合物体系，可同时去除废水中的溶解和胶体物质

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The simultaneous removal of both soluble and colloidal contaminants in wastewater has been a challenge.An innovative flocculation/sorption system has been developed in this work,which consisted of a cationic-modified microporous zeolite HY and an anionic polyacylamide-based polymer.The water-soluble anionic polymers act as flocculants for colloidal particles whereas the cationic-modified zeolite functions not only as an absorbent (towards the soluble or dissolved substances)but also a co-factor for the dual-component flocculation system.Such a system has been applied to clarify the wastewater containing the dissolved and colloidal substances (DCS)encountered in the pulp and paper industry.The quaternized zeolite HY was prepared using glycidyltrimethyl-ammonium chloride (GTMA-Cll)as a cationic reagent via a post-grafting approach to create the covalent bonds between GTMA-Cl and silanos (Si-OH)groups on the surface of zeolite HY.The pore structure and surface characteristics of the modified zeolite HY were determined based on XRD,N_2 adsorption and zeta-potential measurements.The sorption of modified zeolite HY towards benzoic acid and dissolved substances in DCS was determined using an UV spectrometer.The dynamic flocculation of DCS induced by the dual-component systems was monitored using a photometric dispersion analyzer (PDA).The results indicated that the simultaneous removal of DCS has been improved substantially due to the synergy between the cationic zeolites and anionic polymers in the dual-component system.The mechanisms involved in flocculation/sorption were also discussed.
机译：同时去除废水中的可溶性和胶体污染物一直是一个挑战。这项工作开发了一种创新的絮凝/吸附系统，该系统由阳离子改性的微孔沸石HY和阴离子型聚丙烯酰胺基聚合物组成。可溶性阴离子聚合物充当胶体颗粒的絮凝剂，而阳离子改性沸石不仅充当吸收剂（朝向可溶或溶解的物质），而且还作为双组分絮凝系统的辅助因子。澄清纸浆和造纸工业中遇到的含有溶解和胶体物质（DCS）的废水。季铵化沸石HY以缩水甘油基三甲基氯化铵（GTMA-Cll）作为阳离子试剂，通过接枝后方法制得共价沸石HY表面GTMA-Cl与硅烷（Si-OH）基团之间的化学键。修饰物的孔结构和表面特性基于XRD，N_2吸附和Zeta电位测定法确定了HY沸石的分子筛;使用UV光谱仪测定了改性沸石HY对DCS中苯甲酸和溶解物的吸附。双组分系统诱导DCS的动态絮凝结果表明，由于双组分体系中阳离子沸石和阴离子聚合物之间的协同作用，DCS的同时去除得到了实质性的改善。还讨论了。

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