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A novel cactus-like Fe3O4/Halloysite nanocomposite for arsenite and arsenate removal from water

Song, Xiaoli, Zhou, Lei, Zhang, Yun, Chen, Pei, Yang, Zhenglong
Journal of cleaner production 2019 v.224 pp. 573-582
adsorbents, adsorption, arsenates, arsenic, arsenites, coprecipitation, halloysite, iron, iron oxides, nanocomposites, nanotubes, water pollution
In this paper, Fe3O4 was loaded on the surface of halloysite nanotubes (HNTs) by a simple one-pot coprecipitation method to prepare Fe3O4/HNTs nanocomposites (Fe3O4/HNTs) for arsenic removal from water. The growth mechanism and the arsenic removal performance of the nanocomposites were investigated. The morphology of Fe3O4/HNTs varied as the mass ratio of the total iron salts (Fe3+: Fe 2+ = 2:1) to HNTs changed. A novel cactus-like Fe3O4/HNTs was obtained when the ratio is 3:1. The removal efficiency of arsenite (As (III)) and arsenate (As (V)) by the cactus-like Fe3O4/HNTs could reach 98.56% and 99.62%, respectively. Much more, the removal efficiency of As (III) of the cactus-like Fe3O4/HNTs is higher than that of most of the other materials reported under the same conditions. In addition, the cactus-like Fe3O4/HNTs showed good reusability, with an arsenic removal efficiency of up to 83.36% after 6 times of reuse. Adsorption kinetics and isothermal adsorption studies have shown that adsorption is a chemical process with a maximum adsorption capacity of 408.71 mg As(III)/g and 427.72 mg As(V)/g, respectively. The facile preparation method, excellent arsenic removal performance and reusability make the cactus-like Fe3O4/HNTs a potential adsorbent for sustainable arsenic removal from contaminated water.