石英砂负载羟基磷灰石对铅镉吸附性能研究

以溶胶凝胶法制备石英砂负载羟基磷灰石,其在含Pb、Cd初始浓度为100 mg·L-1的混合溶液进行吸附试验,分别研究在不同p H、反应时间及反应温度条件下对Pb、Cd的去除效果。结果表明,复合材料能有效去除混合溶液中的Pb、Cd。p H=5时Pb去除率最大值94.5%,碱性条件下对Cd去除效果更为明显,不同离子间存在竞争关系;反应前30 min,二者去除率均随时间增加而迅速递增;复合材料吸附Pb、Cd更符合准二级动力学模型;高温条件下有利于吸附反应的进行。

Study on Adsorption of Lead and Cadmium by Hydroxyapatite Coated Quartz Sands

The hydroxyapatite coated quartz sands was prepared by sol-gel method. Experiment on adsorb Pb,Cd in solution with initial concentration of 100 mg/L by composite materials under different pH,time and temperature was carried out. The results show that the composite materials can effectively remove Pb and Cd. The maximum removal rate of Pb was 94.5% at pH = 5, and removal efficiency of Cd is more obvious under alkaline condition, and there was a competition between different ions. The removal rate of both two ions is faster in the 30 minutes. The adsorption of Pb and Cd by composite materials is consistent with the Pseudo-first-order kinetics model, and high temperature conditions conducive to the adsorption reaction.