吸附
化学
废水
离子交换
氟化物
核化学
朗缪尔吸附模型
分散剂
自来水
悬挂(拓扑)
海水
色散(光学)
色谱法
分析化学(期刊)
离子
环境工程
无机化学
物理
数学
物理化学
有机化学
海洋学
工程类
地质学
光学
纯数学
同伦
作者
Min Yi,Kaituo Wang,Hongyang Wei,Deshuai Wei,Xuefei Wei,Binghu Wei,Lin Shao,Toyohisa Fujita,Xuemin Cui
标识
DOI:10.1016/j.jhazmat.2022.130027
摘要
In this paper, red mud-based geopolymer microspheres (RM@GMs: 75-150 µm) was prepared by dispersion-suspension-solidification method to remove fluoride ions (F-). It was found that RM@GMs still had good mechanical properties and better F- removal effect at RM content reached 80 % of the total solid mass. The batch adsorption experiment results showed that the F- concentration (< 1.5 mg/L) reached the drinking water standard in 45 min at pH = 2 and RM@GMs dosage was 1 g/L. RM@GMs showed maximum adsorption capacity of 76.57 mg/g for F-, and the adsorption kinetics and isotherm fitted the pseudo-second-order kinetic and Langmuir isotherm model, respectively. RM@GMs exhibited excellent dynamic separation effect at the flow rate of 4 mL/min and column height of 1 cm. In addition, RM@GMs had good selectivity for F- in the competitive adsorption experiments and followed an order of: PO43- > > SO42- ≈ NO3- ≈ Cl-. In real seawater, natural surface water and tap water, RM@GMs still had excellent F- removal effect. The adsorption mechanism revealed that RM@GMs removed F- mainly through the synergistic effect of adsorption and ion exchange. Therefore, this paper provides the potential value for the large-scale utilization of RM in the application of F--containing wastewater.
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