College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China; Department of Geology & Geophysics, Texas A&M University, 77843, USA.
College of Earth Science, Guilin University of Technology, Guilin 541004, China.
Int J Biol Macromol. 2020 Dec 1;164:13-26. doi: 10.1016/j.ijbiomac.2020.07.108. Epub 2020 Jul 15.
A goethite/graphene oxide/chitosan (α-FeO(OH)/GO/CS) nanocomposite adsorbent was prepared and firstly used to remove As(III) from aqueous solution. The composite was characterized by FTIR, XPS, XRD, and EDS techniques. Batch experiments were conducted to investigate the effects of several factors (initial concentration, pH, m/v, contact time, co-existing ions, and temperature) on As(III) adsorption and to evaluate adsorption kinetic, equilibrium isotherm, and thermodynamics. Results showed that As(III) adsorption increased with the increasing initial concentration, contact time, and temperature, but decreased with the increasing m/v and co-existing ions concentrations of SO, PO and Fe. As(III) adsorption remained high at a wide pH range of 3-10. The adsorption was well fitted to a pseudo-second-order kinetic model and was endothermic and spontaneous. The best fit of As(III) adsorption with the Freundlich and Sips models indicated that it was monolayer adsorption, and the maximum adsorption capacity was 289.42 mg/g. As(III) removal was related to -NHCO-, CO, OH, and FeO groups, but the complexation between As(III) ions and hydroxyl iron oxide was the major contributor. After the fifth desorption, the removal efficiency was still as high as 79.6%, indicating excellent reusability. Thus, this composite had great potential for removing As(III) from aqueous solutions.
一种针铁矿/氧化石墨烯/壳聚糖（α-FeO(OH)/GO/CS）纳米复合材料吸附剂被制备出来，并首次用于从水溶液中去除 As(III)。该复合材料通过 FTIR、XPS、XRD 和 EDS 技术进行了表征。通过批次实验研究了几个因素（初始浓度、pH 值、m/v、接触时间、共存离子和温度）对 As(III)吸附的影响，并评估了吸附动力学、平衡等温线和热力学。结果表明，As(III)吸附随初始浓度、接触时间和温度的增加而增加，但随 m/v 和共存离子 SO、PO 和 Fe 浓度的增加而降低。As(III)吸附在 3-10 的宽 pH 范围内保持较高水平。吸附很好地符合伪二级动力学模型，是吸热和自发的。As(III)吸附与 Freundlich 和 Sips 模型的最佳拟合表明，它是单层吸附，最大吸附容量为 289.42 mg/g。As(III)的去除与-NHCO-、CO、OH 和 FeO 基团有关，但 As(III)离子与羟基氧化铁的络合是主要贡献者。经过第五次解吸，去除效率仍高达 79.6%，表明具有优异的可重复使用性。因此，该复合材料在从水溶液中去除 As(III)方面具有很大的潜力。
