【摘要】 采用响应面法对羟基磷灰石（HAP）进行磁性改进，以CaCl₂和KH₂PO₄为原材料，通过水热法制备羟基磷灰石（HAP）,以FeSO₄·7H₂O和FeCl₃·6H₂O为磁源，采用共沉淀法，制备磁性羟基磷灰石（MP）,通过响应面法获得优化的制备条件。通过扫描电镜（SEM）、红外光谱（FT-IR）、磁强计（VSM）等对结构性能、磁学性能等进行表征，和物化性能的深入分析。探究了pH、初始浓度和投加量等因素对水中Ni（Ⅱ）吸附过程的影响。动力学分析表明其吸附过程更符合准二级动力学模型（R²=0.9991）,吸附等温线则与Freundlich等温吸附模型（R²=0.998～0.999）拟合程度度更好，热力学分析表明MP吸附Ni（Ⅱ）是一个自发的、吸热的、熵增的过程。结果表明，改性后的MP有更好的分散性、更大的比表面积和良好的磁性，对水中Ni（Ⅱ）具有更高的吸附效率，吸附容量可达33.40 mg/L,对水中Ni（Ⅱ）的回收有良好的应用前景。更多还原

【Abstract】 In this paper, the response surface method is used to improve the magnetic properties of hydroxyapatite（HAP）. With CaCl₂ and KH₂PO₄ as raw materials, HAP is prepared by hydrothermal method. With FeSO₄·7H₂O and FeCl₃·6H₂O as magnetic sources, magnetic hydroxyapatite（MP） is prepared by co-precipitation method. The optimum preparation conditions were obtained by response surface method. By means of scanning electron microscopy（SEM）, infrared spectroscopy（FT-IR） and magnetometer（VSM）, the structural and magnetic properties were characterized, and the physical and chemical properties were further analyzed. The effects of pH, initial concentration and dosage on the adsorption of Ni（Ⅱ） in water were investigated. The kinetic analysis showed that the adsorption process was more consistent with the quasi-second-order kinetic model（R²=0.9991）, and the adsorption isotherm was better fitted to the Freundlich isotherm model（R²=0.998-0.999）. The thermodynamic analysis showed that the adsorption of Ni（Ⅱ） by MP was a spontaneous, endothermic and entropy increasing process. The results show that the modified MP has better dispersibility, larger specific surface area and good magnetic properties, and has higher adsorption efficiency for Ni（Ⅱ） in water, the adsorption capacity can reach 33.40 mg/L, and has a good application prospect for Ni（Ⅱ） recovery in water.更多还原