标题：Dispersion-precipitation synthesis of nanosized magnetic iron oxide for efficient removal of arsenite in water作者：Cheng, Wei; Xu, Jing; Wang, Yajie; Wu, Feng; Xu, Xiuyan; Li, Jinjun

来源出版物：JOURNAL OF COLLOID AND INTERFACE SCIENCE 卷：445 页：93-101 DOI：10.1016/j.jcis.2014.12.082 出版年：MAY 1 2015

摘要：Nanosized magnetic iron oxide was facilely synthesized by a dispersion-precipitation method, which involved acetone-promoted precipitation of colloidal hydrous iron oxide nanoparticles and subsequent calcination of the precipitate at 250 degrees C. Characterization by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, nitrogen sorption, and vibrating-sample magnetometry revealed that the material was a composite of alpha-Fe2O3 and gamma-Fe2O3 with primary particle size of 15-25 nm and specific surface area of 121 m(2)/g, as well as superparamagnetic property. The material was used as adsorbent for the removal of arsenite in water. Batch experiments showed that the adsorption isotherms at pH 3.0-11.0 fit the Langmuir equation and the adsorption obeys pseudo-second-order kinetics. Its maximum sorption capability for arsenite is 46.5 mg/g at pH 7.0. Coexisting nitrate, carbonate, sulfate, chloride, and fluoride have no significant effect on the removal efficiency of arsenite, while phosphate and silicate reduce the removal efficiency to some extent. The As(III) removal mechanism is chemisorption through forming inner-sphere surface complexes. The efficiency of arsenic removal is still maintained after five cycles of regeneration-reuse.

入藏号：WOS:000350006700012

文献类型：Article

语种：English

作者关键词：Arsenic, Adsorption, Water purification, Iron oxide, Nanoparticle

扩展关键词：FE3O4 NANOPARTICLES; COMPLETE OXIDATION; AQUEOUS-SOLUTIONS; ACETIC-ACID; ADSORPTION; AS(III); AS(V); FE; MECHANISM; ADSORBENT

通讯作者地址：Li, Jinjun; Wuhan Univ, Sch Resources & Environm Sci, Hubei Key Lab Bioresources & Environm Biotechnol, Wuhan 430079, Peoples R China.

电子邮件地址：ljjcbacademy@163.com

地址：

[Cheng, Wei; Xu, Jing; Wang, Yajie; Wu, Feng; Li, Jinjun] Wuhan Univ, Sch Resources & Environm Sci, Hubei Key Lab Bioresources & Environm Biotechnol, Wuhan 430079, Peoples R China.

[Xu, Xiuyan] China Natl Environm Monitoring Ctr, Beijing 100012, Peoples R China.

研究方向：Chemistry

ISSN：0021-9797

eISSN：1095-7103