标题：Bromate removal from aqueous solutions by nano crystalline akaganeite (β-FeOOH)-coated quartz sand (CACQS)
作者：Xu C.; Shi J.; Zhou W.; Gao B.; Yue Q.; Wang X.
作者机构：[Xu, C] School of Environmental Science and Engineering, Shandong University, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, J 更多
通讯作者地址：[Zhou, W] School of Environmental Science and Engineering, Shandong University, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, 更多
来源：Chemical Engineering Journal
关键词：β-FeOOH-coated quartz sand (CACQS); Adsorption; Bromate; Isotherm; Kinetics
摘要：We investigated the feasibility of nano crystalline akaganeite (β-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. μg/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. © 2012 Elsevier B.V.