改性羟基磷灰石对水体中五价钒的吸附

Adsorption of Vanadium(Ⅴ) in Aqueous Solution by Modified Hydroxyapatite

随着工业的发展,水体重金属污染逐渐成为环境污染的重要组成部分,寻求环境友好型材料来治理水体重金属污染已成为当今环境科学研究的热点之一。以Ca(NO_3)_2·4H_2O和(NH_4)_2HPO_4为原料,利用溶液共沉淀法制备羟基磷灰石,并采用聚乙二醇对其改性,得到改性羟基磷灰石,并用其对水体中的钒污染物进行吸附研究。单因素吸附实验表明,溶液pH值、吸附剂投加量、吸附时间和环境温度均会对吸附产生影响。在钒浓度为100 mg·L^(-1),溶液pH值为5.00的条件下,当改性羟基磷灰石投加量为10 g·L^(-1)时,吸附趋于平衡,得到最大吸附率95.2%。在一定条件下,聚乙二醇改性羟基磷灰石可用于水体钒污染的修复。

With the development of industry, heavy metal pollution in water has become an important environmental problem. Using environmentally friendly material to adsorb heavy metal in waste water is a promising way to control heavy metal pollution. In this paper, hydroxyapatite was synthesised by the co-precipitation method, and modified by poly ethyleneglycol. Solution p H , dosage of adsorbent, adsorption time and ambient temperature all had effects on the adsorption of vanadium on the hydroxyapatite. At 100 mg· L^-1 initial vanadium （ V ） , and modified hydroxyapatite dosage 10 g · L^-1 under p H 5. 00, the adsorption reached equilibrium, and the maximum adsorption rate was 95. 2%. Therefore, in certain conditions, polyethyleneglycol modified hydroxyapatite can be used for the remediation of vanadium polluted water.