羟基磷灰石对溶液及土壤中Pb^(2+)的吸附研究

Adsorption of Pb^(2+) in Solution and Soil by Hydroxyapatite

羟基磷灰石(HAP)能有效固定土壤和溶液中的Pb2+,研究了羟基磷灰石对Pb2+的吸附特性,讨论了离子的初始浓度,羟基磷灰石的用量、作用时间及离子间的相互影响。结果表明:HAP对Pb2+的最佳吸附条件为Pb2+初始浓度为500 mg/L,HAP用量为5 g/L,吸附时间为40 min。在Pb2+、F-混合溶液中,Pb2+/F-质量浓度比的改变对HAP吸附Pb2+的影响很大,对F-的吸附率没有太大影响。HAP在茶园土壤中的最佳添加量是10 g/kg。

Hydroxyapatite （HAP） can fix Pb^2＋ in solution and soil effectively. The absorption characters of HAP to Pb^2＋ were investigated, and the initial concentrations of ions, the HAP dosage, the reaction time and the mutual effects between ions were also discussed. The results demonstrated that HAP can adsorb Pb^2＋ the most effectively when initial concentration of Pb^2＋ 500 mg/L, HAP dosage is 5 g/L, and adsorption time is 40 minutes. When HAP absorbs ions in the Pb^2＋-F- solution, the change of Pb^2＋/F- mass concentration ratio has great impact on the absorption rate of Pb^2＋. while its impact on the adsorption rate of F- is negligible. The optimum HAP dosage for tea garden is 10 g/kg.