工业石膏合成羟基磷灰石及其对Pb2+,Cu2+,Zn2+和Ni2+的吸附作用

研究了以工业石膏为原料合成羟基磷灰石(HAp)的方法，并考察了所制备的HAp对水溶液中Pb2+, Cu2+, Zn2+和Ni2+四种金属离子的吸附作用. 结果表明，在反应温度90℃、磷酸氢二铵和工业石膏物质的量比为1:2的条件下，反应24 h便可以得到较纯的HAp. 所制备的HAp在pH 7的条件下对水溶液中的Pb2+, Cu2+, Zn2+和Ni2+均具有一定的吸收能力，其饱和吸附量分别为1095, 86.76, 64.68和67.90 mg/g. 该吸附过程符合Langmuir吸附模型.

Preparation of Hydroxyapatite with Industrial Gypsum and Its Adsorptionupon Pb2+, Cu2+, Zn2+ and Ni2+

The preparation method of hydroxyapatite (HAp) with industrial gypsum was investigated. The adsorption abilities of as-prepared samples upon Pb2+, Cu2+, Zn2+ and Ni2+ ions in aqueous solution were examined. It was indicated that pure HAp could be successfully fabricated when the molar ratio of (NH4)2HPO4 to industrial gypsum was 1:2 with the reaction between them for 24 h under 90℃. The as-synthesized HAp exhibited obvious adsorption ability upon Pb2+, Cu2+, Zn2+ and Ni2+ ions under pH 7, and their saturated adsorption amounts were 1095, 86.76, 64.68 and 67.90 mg/g respectively. Their adsorption behaviors could be described with the Langmuir model approximately.