School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.
Hunan Jing Yi Environmental Protection High Tech Development Co. Ltd., Xiangtan, China.
Sci Rep. 2019 Sep 10;9(1):13021. doi: 10.1038/s41598-019-49679-9.
A novel adsorbent (FeO/HCO) was prepared via co-precipitation from a mix of ferriferrous oxide and a Ce-rich waste industrial sludge recovered from an optical polishing activity. The effect of system parameters including reaction time, pH, dose, temperature as well as initial concentration on the adsorption of Sb(III) were investigated by sequential batch tests. The Sb(III)/FeO/HCO system quickly reached adsorption equilibrium within 2 h, was effective over a wide pH (3-7) and demonstrated excellent removal at a 60 mg/L Sb(III) concentration. Three isothermal adsorption models were assessed to describe the equilibrium data for Sb(III) with FeO/HCO. Compared to the Freundlich and dubinin-radushkevich, the Langmuir isotherm model showed the best fit, with a maximum adsorption capacity of 22.853 mg/g, which exceeds many comparable absorbents. Four kinetic models, Pseudo-first-order, Pseudo-second-order, Elovich and Intra-particle, were used to fit the adsorption process. The analysis showed that the mechanism was pseudo-second-order and chemical adsorption played a dominant role in the adsorption of Sb(III) by FeO/HCO (correlation coefficient R = 0.993). Thermodynamic calculations suggest that adsorption of Sb(III) ions was endothermic, spontaneous and a thermodynamically feasible process. The mechanism of the adsorption of Sb(III) on FeO/HCO could be described by the synergistic adsorption of Sb (III) on FeO, FeCeO and hydrous ceric oxide. The FeO/HCO sorbent appears to be an efficient and environment-friendly material for the removal of Sb(III) from wastewater.
一种新型吸附剂（FeO/HCO）通过共沉淀法从氧化亚铁和从光学抛光活动中回收的富含铈的工业废物混合物中制备。通过顺序批处理试验研究了系统参数（包括反应时间，pH，剂量，温度以及初始浓度）对 Sb（III）吸附的影响。Sb（III）/FeO/HCO 体系在 2 h 内迅速达到吸附平衡，在较宽的 pH（3-7）范围内有效，并且在 60mg/L Sb（III）浓度下表现出优异的去除效果。评估了三种等温吸附模型来描述 FeO/HCO 对 Sb（III）的平衡数据。与 Freundlich 和 dubinin-radushkevich 相比，Langmuir 等温线模型显示出最佳拟合，最大吸附容量为 22.853mg/g，超过许多可比的吸附剂。采用准一级，准二级，Elovich 和内粒子四种动力学模型拟合吸附过程。分析表明，该机理为准二级，化学吸附在 FeO/HCO 吸附 Sb（III）中起主导作用（相关系数 R=0.993）。热力学计算表明，Sb（III）离子的吸附是吸热，自发和热力学可行的过程。Sb（III）在 FeO/HCO 上的吸附机理可以描述为 Sb（III）在 FeO，FeCeO 和水合氧化铈上的协同吸附。FeO/HCO 吸附剂似乎是一种从废水中去除 Sb（III）的高效，环保的材料。
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