绣球花状掺锶碳羟基磷灰石对Pb2+的吸附
Study on Pb2+ adsorption by hydrangea-like strontium-doped carbonate hydroxyapatite
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摘要: 以NH4H2PO4、Ca（NO3）2·4H2O、Sr（NO3）2和尿素[CO（NH2）2]为原材料，通过水热法合成了一种单分散、由纳米片自组装而成的绣球花状三维（3-D）掺锶碳羟基磷灰石（Sr-CHAp），并用于吸附酸性水溶液中的铅离子（Pb2+）.研究了溶液pH、吸附时间、初始浓度对Sr-CHAp材料吸附Pb2+的影响及在其在不同pH条件下的吸附机理.采用XRD、SEM、FI-IR和BET等技术对材料及吸附产物进行表征.结果表明，该吸附剂材料表面具有介孔结构，平均孔隙宽度是11.10 nm，具有较大的比表面积（43.54 m2·g-1），在pH 3时对Pb2+具有较高的饱和吸附量（985.1 mg·g-1）；其等温线吸附数据符合Langmuir模型，动力学吸附数据符合伪二级动力学模型；在酸性溶液中其对Pb2+的吸附主要表现为溶解/沉淀机理，溶液pH值的大小影响吸附后的产物，强酸性条件下有利于PbHPO4的生成，而pH值为3—6时主要生成Pb10（PO4）6（OH）2.Abstract: Using NH4H2PO4,Ca(NO3)2·4H2O,Sr(NO3)2 and urea [CO(NH2)2] as raw materials,monodisperse nanosheets-assembled hydrangea-like three-dimensional (3-D) strontium-doped carbonate hydroxyapatite (Sr-CHAp) was synthesized by a hydrothermal method, and used as an adsorbent for the removal of lead ions (Pb2+) from acidic aqueous solutions. The effects of pH value,contact time and initial concentration of Pb2+ solutions on the adsorption of the Sr-CHAp material and its adsorption mechanism under different pH were studied. The adsorbent and the products were characterized by XRD,SEM,FI-IR and BET etc.. The results show that the obtained Sr-CHAp had a mesoporous structure, of which the average width is 11.10 nm. It had a large specific surface area of 43.54 m2·g-1 and a high adsorption capacity (985.1 mg·g-1) towards Pb2+ at pH 3. The isotherm accords with the Langmuir model, and the kinetic data conform to the pseudo-second order kinetic model. The mechanism of Pb2+ adsorption was attributed to dissolution/precipitation process in acid solutions. The products were different at different pH value. Strong acidic solution was favorable for the formation of PbHPO4 while Pb10(PO4)6(OH)2 was the main product when pH was between 3—6.
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