Effects of temperature on the preparation and characteristics of hydroxyapatite and its adsorptive properties toward lead
Effects of temperature on the preparation and characteristics of hydroxyapatite and its adsorptive properties toward lead
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DOI：
10.1039/c4nj01836b
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发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Batis, Narjes Harrouch
中科院分区：
文献类型：
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作者：
El Khal, Hana;Batis, Narjes Harrouch
采用燃烧法在硝酸钙、磷酸二铵和尿素的水相体系中成功合成了羟基磷灰石(HAp)[Ca-10(PO4)(6)(OH)(2)]。利用 XRD、FTIR、ATD/ATG 和 N-2 吸附研究了煅烧温度对 HAp 相组成的影响。结果发现，在500℃和700℃时，粉末中的主要相是HAp，并含有少量β-磷酸三钙（β-TCP），而在300℃时仅观察到HAp相。合成的HAp2具有更高的比表面积（48 m(2) g(-1)），可用于去除Pb2+。在批量实验中研究了以下参数接触时间、铅的初始浓度和温度。动力学研究表明，准二级动力学模型是描述吸附过程动态行为的合适模型。朗缪尔等温线模型确实适合平衡数据。 HAp2 可用作有效的吸附剂，用于去除水溶液中的 Pb2+。
Hydroxyapatite (HAp), [Ca-10(PO4)(6)(OH)(2)], was successfully synthesized by a combustion method in the aqueous system containing calcium nitrate, di-ammonium phosphate and urea. The effect of calcination temperature on the composition of the HAp phase was studied using XRD, FTIR, ATD/ATG, and N-2 adsorption. It was found that at 500 degrees C and 700 degrees C, the dominant phase in the powders was HAp with small amounts of beta-tricalcium phosphate (beta-TCP), and only the HAp phase was observed at 300 degrees C. The synthesized HAp2 with a higher specific surface area (48 m(2) g(-1)) was used for the removal of Pb2+. The following parameters contact time, initial concentration of lead and temperature were studied in batch experiments. Kinetic studies showed that the pseudo-second-order kinetic model was an appropriate model to describe the dynamic behavior of the adsorption process. The Langmuir isotherm model was certainly fitted to the equilibrium data. HAp2 can then be used as an effective adsorbent for removal of Pb2+ from aqueous solution.