Ljiljana Surčić, Tamara Tadić, A. Nastasović, Bojana Markovic, A. Onjia
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引用次数: 0
摘要
砷是一种类金属,在自然界中以多种形式存在,但在天然水体中主要以五价砷酸盐As(V)和三价砷酸盐As(III)的氧阴离子形式存在,在厌氧条件下以三价砷酸盐As(III)为主。砷水污染是一个严重的问题,因为它对人类健康有明显的负面影响。本文研究了氧阴离子As(V)在单组分水溶液中吸附甲基丙烯酸甘油酯和乙二醇二甲基丙烯酸甘油酯- m- si - pgme - delta的硅烷化磁性氨基功能化共聚物的动力学和平衡机理。研究表明,As(V)在m- si - pgme - δ上的吸附是一个快速的过程,最初受离子在溶液中的扩散速率控制。在吸附剂表面达到饱和后,吸附速率降低,因为吸附速率决定了颗粒内孔隙扩散的过程。最大吸附量为5.61 μmol μ g-1。
Kinetic and equilibrium study of arsenic sorption on silanized magnetic amino-functionalized nanocomposite
Arsenic is a metalloid, which occurs in nature in various forms, but in natural waters mainly in the form of pentavalent oxyanion of arsenate As(V) and trivalent arsenite As(III), which dominates under anaerobic conditions. Arsenic water pollution is a serious problem due to its pronounced negative impact on human health. This paper describes the kinetic and equilibrium studies of the sorption mechanism of oxyanion As(V) in monocomponent aqueous solutions on a silanized magnetic amino-functionalized copolymer of glycidyl methacrylate and ethylene glycol dimethacrylate m-Si-PGME-deta. It has been shown that the sorption of As(V) on m-Si-PGME-deta is a rapid process, initially controlled by ion diffusion rate through solution. After achieving the saturation of the sorbent surface, the sorption rate decreases, because the sorption rate determines the process of intraparticle pore diffusion. The maximum sorption capacity is 5.61 μmolˑg-1.