摘要
砷污染是一个严重的世界问题,在其诸多的去除方法中,负载铁离子活性炭兼顾了活性炭和混凝沉淀的优势,可高效去除砷离子。作者对负载铁离子活性炭的制备方法、影响砷去除率的主要因素和吸附模型的研究现状进行了详细评述,其中负载铁离子活性炭的孔径结构、表面性质,负载铁离子的形貌、分布、种类和质量等决定着其吸附容量;通过调节搅拌时间、溶液pH值、温度和离子强度可提高砷的去除率;Langmuir模型、Freundlich模型可描述砷在负载铁离子活性炭表面的物理吸附,而表面络合模型均可描述其配位体交换、化学吸附机理,最后对其发展方向进行了简要评述。
Arsenic in natural water is a worldwide problem.Activated carbon adopted ion iron can be used as the adsorbent to efficiently remove arsenic from water,which takes into account the advantages of both flocculation and activated carbon adsorption.The synthesizing method of the materials,main effects on arsenic removed and research development of adsorption model were discussed in details.More specifically,the paper focused on the adsorption capacity of the sample,mainly dependent of pore structure,surface properties and the characteristics of the ion（such as species,distribution,morphology and content）.Furthermore,the relation between the arsenic removed and the stirring time,solution pH,temperature and ion strength was studied.The Langmuir model and Freundlich model were used to describe the physical adsorption.The Surface Complex Formation Model was used to illustrate the mechanism of ligand exchange and chemical adsorption.Finally,future developments for arsenic uptake by activated carbon adopted ion iron were reviewed.
出处
《化工科技》
CAS
2011年第6期65-70,共6页
Science & Technology in Chemical Industry
基金
国家自然科学基金资助项目(21061007)
关键词
活性炭
负载
铁离子
砷
Activated carbon
Adopted
Iron ion
Arsenic
