Bromate removal from aqueous solutions by nano crystalline akaganeite (尾-FeOOH)-coated quartz sand (CACQS)

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• 作者：Chunhua Xu ^{xuchunhua@sdu.edu.cn} ; Junjun Shi ^{shijunjun165@163.com} ; Weizhi Zhou ; ^{wzzhou@sdu.edu.cn} ; Baoyu Gao ^{bygao@sdu.edu.cn} ; Qinyan Yue ^{qyyue@sdu.edu.cn} ; Xiaohong Wang ^{lmj15848247414@163.com}
• 关键词：尾-FeOOH-coated quartz sand (CACQS) ; Bromate ; Adsorption ; Isotherm ; Kinetics
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 April, 2012
• 卷：187
• 期：Complete
• 页码：63-68
• 文件大小：373 K

摘要

We investigated the feasibility of nano crystalline akaganeite (尾-FeOOH)-coated quartz sand (CACQS) for bromate removal from aqueous solutions. Batch experiments were carried out as a function of various operational conditions such as adsorbent dosage (20-160 g/L), initial pH (3-12), contact time (1-240 min), initial bromate concentration (0.6-10 mg/L) and temperature (288 K, 298 K and 308 K). The uptake rate of bromate was rapid and the adsorption was almost saturated within 20 min. The adsorption kinetics can be described by the pseudo-second-order equation. The maximum adsorption capacity of the adsorbent for bromate removal was 37.8 渭g/g at 298 K. The data fit well with the Langmuir model. Optimum bromate removal was observed between pH 3 and 10. Analysis of the adsorption thermodynamics showed that the adsorption of bromate by CACQS was spontaneous, exothermic and occurred due to physisorption.