Thakkar Megha, Randhawa Varunpreet, Mitra Somenath, Wei Liping
Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ, United States.
Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ, United States.
J Colloid Interface Sci. 2015 Nov 1;457:169-73. doi: 10.1016/j.jcis.2015.07.003. Epub 2015 Jul 3.
This study presents the synthesis of diatom-FeOx composite as a novel sorbent for arsenic removal from water. The unique porous architecture of the diatom was utilized to immobilize iron oxide to form the composite. The surface area was as high as 70 m(2)/g. The adsorption isotherms for As (III) and As (V) followed the Langmuir, Freundlich and D-R models. Langmuir monolayer adsorption capacity for arsenite (As III) was 10,000 μg/g and arsenate (As V) was 12,500 μg/g. The pseudo-second order rate equation was found to effectively describe the kinetics of arsenic adsorption. This study opens the door for the development of bio derived materials for environmental remediation.
本研究介绍了硅藻 - 铁氧化物复合材料的合成，该复合材料是一种用于去除水中砷的新型吸附剂。利用硅藻独特的多孔结构固定氧化铁以形成复合材料。其表面积高达70平方米/克。As（III）和As（V）的吸附等温线符合朗缪尔、弗伦德里希和D-R模型。亚砷酸盐（As III）的朗缪尔单层吸附容量为10,000 μg/g，砷酸盐（As V）为12,500 μg/g。发现准二级速率方程能有效描述砷吸附的动力学。本研究为开发用于环境修复的生物衍生材料打开了大门。
