标題：Etching synthesis of iron oxide nanoparticles for adsorption of arsenic from water作者：Cheng, Wei; Zhang, Weidong; Hu, Lijuan; Ding, Wei; Wu, Feng; Li, Jinjun

來源出版物：RSC ADVANCES 卷：6 期：19 頁碼：15900-15910 DOI: 10.1039/c5ra26143k 出版年：2016

摘要：Arsenic contamination in source drinking water has become an alarming issue worldwide. Iron oxides have been recognized as effective adsorbents for arsenic removal. In this study, an etching method was used to synthesize nanosized iron oxide with small primary particle sizes of approximately 4 nm and a high specific surface area of 317 m(2) g(-1). The material was used as an adsorbent for arsenic removal from water. The sorption isotherms fit the Langmuir equation, and the derived maximum sorption capability for As(III) and As(V) is 42 mg g(-1) at pH 7 and 83 mg g(-1) at pH 3, respectively. Arsenic adsorption obeys pseudo-second-order kinetics. The adsorption sites were located mostly on the external nanoparticle surface, and therefore intraparticle diffusion resistance was avoided and external diffusion was the rate-limiting step. The mechanism of arsenic removal on nanosized iron oxide is chemisorption via inner-sphere surface complexation, and the hydroxyl groups of arsenic species are important for reaction with adsorbent surface hydroxyl groups. Adsorption of As(III) in the presence of hydrogen peroxide and ferrous ion was also studied, and the catalytic oxidation of As(III) significantly promoted its adsorptive removal.

入藏号：WOS:000370422000078

文獻類型：Article

語種：English

擴展關鍵詞：CHROMATE RETENTION MECHANISMS; EFFICIENT REMOVAL; AQUEOUS-SOLUTION; ACTIVATED CARBON; AS(III) REMOVAL; AS(V) REMOVAL; HEAVY-METAL; OXIDATION; MANGANESE; BEHAVIOR

通訊作者地址：Li, JJ, Wuhan Univ, Sch Resources & Environm Sci, Hubei Key Lab Bioresources & Environm Biotechnol, 129 Luoyu Rd, Wuhan 430079, Peoples R China.

電子郵件地址：ljjcbacademy@163.com

地址： [Cheng, Wei; Zhang, Weidong; Hu, Lijuan; Ding, Wei; Wu, Feng; Li, Jinjun] Wuhan Univ, Sch Resources & Environm Sci, Hubei Key Lab Bioresources & Environm Biotechnol, 129 Luoyu Rd, Wuhan 430079, Peoples R China.

研究方向：Chemistry

ISSN：2046-2069

影響因子（2014）：3.84