Adsorption of arsenic(V) by the magnetic hydrotalcite: iron oxide composite

Quimica nova

Rosário, Rafael Henrique do¹  Toledo, Thiago Vinícius¹  Marques Neto, José de Oliveira¹  Bellato, Carlos Roberto¹ 

[1] Universidade Federal de Viçosa, Viçosa, Brasil

关键词: hidrotalcite - iron oxide composite;    arsenate;    adsorption.;   

DOI  :  10.1590/S0100-40422011000400002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this work, hydrotalcite,a layered double hydroxide, had its adsorption and ion exchange properties combinedwith the magnetic properties of iron oxide to produce a magnetic adsorbent,HT-Fe. The removal of As(V) by a HT-Fe adsorbent was evaluated under variousconditions. The Kinetic process was well described by a pseudo-second orderrate model. The maximum adsorption capacity, calculated with the Langmuir modelshowed to be dependent on pH, reaching values of 24.09, 10.19 and 7.44 mg g-1,respectively, for pH values of 4.0, 7.0 and 9.0. The inhibition by competitionof anions is dependent on the type of ionic species.

【 授权许可】

CC BY