Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China; School of Resources, Environment and Materials, Guangxi University, Guangxi Nanning, 530004, China.
School of Resources, Environment and Materials, Guangxi University, Guangxi Nanning, 530004, China.
J Hazard Mater. 2020 Dec 5;400:123199. doi: 10.1016/j.jhazmat.2020.123199. Epub 2020 Jun 12.
A new cerium oxide loaded slag-based geopolymer microspheres (CeO@SGMs) was prepared by a two-step i.e. dispersion-suspension-solidification and in-situ co-precipitation method. The optimal parameters for the preparation of 0.02CeO@SGMs were slag (30 g), 1.7 M water glass (12.86 g), water (8 g) and 0.02 mol/L of Ce. 0.02CeO@SGMs was characterized by SEM, XRD, BET, EDX, FTIR, XPS and PSD techniques. The leaching concentration of Ca (95.65 mg/L) was only 1/5 of the SGMs at pH 2 after the modification of CeO. Adsorption data fitted well with Freundlich isotherm model suggesting multilayer adsorption mechanism with a maximum adsorption capacity for F by 0.02CeO@SGMs of 121.77 mg/g at 298 K. The negative values of thermodynamic parameters (ΔH and ΔS) indicated the exothermic nature of the adsorption process with reduced chaos of the whole system. 0.02CeO@SGMs exhibited excellent dynamic adsorption performance at 4 mL/min F solution flow rate. The influence of various co-existing anions on adsorption of F over 0.02CeO@SGMs followed an order of: Cl ≈ NO < SO << PO. Attributed to the facile preparation process, cost-effectiveness and environmental friendliness, the newly designed 0.02CeO@SGMs can be deemed of promising industrial applications for the abatement of F from wastewater.
一种新型的氧化铈负载渣基地质聚合物微球（CeO@SGMs）通过两步法即分散-悬浮-固相结合原位共沉淀法制备。制备 0.02CeO@SGMs 的最佳参数为渣（30g）、1.7M 水玻璃（12.86g）、水（8g）和 0.02mol/L 的 Ce。采用 SEM、XRD、BET、EDX、FTIR、XPS 和 PSD 技术对 0.02CeO@SGMs 进行了表征。CeO 改性后，pH 为 2 时，Ca 的浸出浓度（95.65mg/L）仅为 SGMs 的 1/5。吸附数据与 Freundlich 等温线模型拟合良好，表明吸附机制为多层吸附，在 298K 时，0.02CeO@SGMs 对 F 的最大吸附容量为 121.77mg/g。热力学参数（ΔH 和ΔS）的负值表明吸附过程为放热，整个体系的混乱度降低。在 4mL/min 的 F 溶液流速下，0.02CeO@SGMs 表现出优异的动态吸附性能。各种共存阴离子对 0.02CeO@SGMs 吸附 F 的影响顺序为：Cl≈NO<SO<<PO。由于其制备工艺简单、成本效益高、环境友好，新设计的 0.02CeO@SGMs 有望在工业上得到广泛应用，用于去除废水中的 F。
