赤泥颗粒吸附剂吸附水中磷酸根离子动态研究

Dynamic Study on Adsorption of Phosphate Ion in Water by Red Mud Particle Adsorbent

采用拜耳法赤泥为原料,针对传统烧结法耗能大、成本高的问题,采用非烧结的方法制备颗粒吸附剂,考察以及吸附剂投加量、初始磷酸根浓度、pH值和温度因素对吸附除磷的赤泥颗粒吸附剂对磷酸根的吸附性能影响,吸附实验结果显示对磷酸根的吸附量达到了67.68 mg/g,优于其他文献报道的吸附剂。基于试验结果,对赤泥颗粒吸附剂对磷酸根的吸附行为进行等温吸附、动力学的数学拟合,伪二级动力学和Langmuir-Freundlich吸附等温式能较好描述赤泥颗粒吸附剂对磷酸根的吸附行为,其相关系数R 2均大于0.98,赤泥颗粒吸附剂对磷酸根的吸附过程既存在多层吸附,也存在单层吸附且符合化学吸附的特点。

Using Bayer's red mud as raw material,in view of the problem of high energy consumption and high cost of traditional sintering method,the particle adsorbent is prepared by non-sintering method,and the effect of the adsorption performance of the aerosol sorbent agent,the initial phosphate root concentration,pH value and temperature factors on the adsorption performance of the red mud particle adsorbent adsorption absorbent to phosphorus,The adsorption experiments showed that the adsorption capacity of phosphate was 67.68 mg/g,which was better than that reported in other literatures.Based on the experimental results,the adsorption behavior of red mud particle adsorbent for phosphate was isothermally adsorbed.The mathematical fitting of kinetics,pseudo-second-order kinetics and Langmuir-Freundlich adsorption isotherm equation can better describe the phosphorus adsorption of red mud particle adsorbent.The adsorption behavior of acid roots is higher than 0.98,and the adsorption process of red mud particle adsorbent for phosphate is not only multi-layer adsorption,but also monolayer adsorption,which accords with the characteristics of chemical adsorption.