电气石对溶液中Sr^(2+)的吸附行为研究

Characteristics of Sr^(2+) Adsorption by Tourmaline

采用静态吸附法研究电气石对水溶液中Sr^(2+)的吸附行为,考察溶液初始pH、电气石投加量、吸附时间和Sr^(2+)初始浓度对吸附的影响,并分析吸附过程中反应动力学和等温吸附规律。结果表明,电气石能够有效去除水体中的Sr^(2+),最大吸附容量为2.87 mg/g。电气石粉体对Sr^(2+)的吸附平衡时间为40 min、吸附剂投加量增大、溶液p H 8.5时有利于Sr^(2+)的去除;电气石对Sr^(2+)的吸附动力学行为可用准二级动力学模型来描述,吸附过程存在化学作用且步骤可控;吸附过程符合Langmuir等温吸附模型。电气石对Sr^(2+)的吸附既存在物理吸附,又存在化学吸附。

The adsorption characteristics of Sr^2＋on tourmaline were investigated by conducting a series of batch adsorption experiments in the study. The influence of solution p H,adsorbent dosage,initial Sr^2＋concentration and contact time were investigated,kinetics and adsorption isotherm law were analyzed. The results showed that Sr2 ＋removal rate increased with the increase of adsorbent dosage,and the highest adsorption reached at p H 8.5 and contact time was 40 min. The adsorption process fits pseudo-second-order kinetic model and Langmuir isotherm equation,and the maximum adsorption capacity for Sr^2＋was 2.87 mg / g. Speculation for the behavior of Sr^2＋adsorption by tourmaline was both physical adsorption and chemical adsorption.