Adsorptive Bromate Removal from Aqueous Solution by Commercial Strongly Basic Resin Impregnated with Hydrated Ferric Oxide (HFO): Kinetics and Equilibrium Studies
Adsorptive Bromate Removal from Aqueous Solution by Commercial Strongly Basic Resin Impregnated with Hydrated Ferric Oxide (HFO): Kinetics and Equilibrium Studies
复制标题
通过浸渍水合氧化铁 (HFO) 的商用强碱性树脂吸附去除水溶液中的溴酸盐：动力学和平衡研究
DOI：
10.1021/acs.jced.5b00947
复制
发表时间：
2016-03-01
期刊：
影响因子：
--
通讯作者：
Zeng, Guangming
中科院分区：
文献类型：
--
作者：
Li, Sibei;Yang, Qi;Zeng, Guangming
在FeCl 3-HCl-NaCl溶液中，用水合氧化铁（HFO）浸渍工业强碱性树脂D201-Cl，吸附去除水中的溴酸根。通过静态吸附实验，研究了溴酸根初始浓度、接触时间、初始pH、温度和竞争阴离子对HFO浸渍树脂D201-Cl（HFO-201）吸附溴酸根的影响。实验结果表明，吸附过程符合准一级动力学方程，并根据颗粒内扩散参数将吸附过程分为三个阶段。HFO浸渍树脂对溴酸根的最大吸附电位为292.81 mg. g（-1），这比以前的研究中报道的要大得多。实验数据符合Redlich-Peterson等温模型（R-2 > 0.99）。热力学参数如自由能、焓和熵表明溴酸盐在HFO-201上的吸附是自发的、放热的，并且是通过物理吸附发生的。同时，HFO-201在盐共存溶液中对溴酸盐保持了较强的吸附能力。本研究的结果表明，廉价和方便的HFO浸渍树脂具有很大的潜力，从饮用水中去除溴酸盐。
Commercial strongly basic resin D201-Cl was impregnated with hydrous ferric oxide (HFO) in FeCl3-HCl-NaCl solution for absorptive removal of bromate from aqueous solution. The influences of initial bromate concentration, contact time, initial pH, temperature, and competing anions on the uptake of bromate by HFO-impregnated resin D201-Cl (HFO-201) were investigated by batch adsorption experiments. Experimental results showed that the adsorption process could be described by pseudo first -order kinetics and be divided into three stages according to the intraparticle diffusion parameter. The maximum adsorption potential of HFO-impregnated resin for bromate was 292.81 mg. g(-1) at 298 K, which is much greater than those reported in previous studies. The experimental data fitted well to the Redlich-Peterson isotherm model (R-2 > 0.99). Thermodynamic parameters such as free energy, enthalpy, and entropy demonstrated that bromate adsorption on HFO-201 was spontaneous and exothermic and occurred by physisorption. Meanwhile, HFO-201 maintained greater adsorption capacity for bromate in salt coexisting solution. Results of the present study suggest that the cheap and facile HFO-impregnated resin possesses great potential for bromate removal from drinking water.