【作者】 严玉波； 董晓丽； 孙晓蕾； 李健生； 沈锦优； 韩卫清； 刘晓东； 孙秀云； 王连军；

【Author】 YAN Yu-bo;DONG Xiao-li;SUN Xiao-lei;LI Jian-sheng;SHEN Jin-you;HAN Wei-qing;LIU Xiao-dong;SUN Xiu-yun;WANG Lian-jun;Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse,School of Environmental Science and Engineering,Nanjing University of Science and Technology;

【机构】 江苏省化工污染控制与资源化重点实验室南京理工大学环境与生物工程学院；

【摘要】 以燃煤电厂废弃物脱硫石膏（FGD）为主要原料,利用水热合成法制备羟基磷灰石（FGD-HA）,利用XRD和SEM对FGD-HA的物相组成和微观形貌进行了分析和观察.通过静态吸附实验研究了吸附动力学、吸附等温线以及吸附热力学.结果表明,伪二级动力学模型相关系数为0.9998,是描述FGD-HA吸附Cu²⁺的最佳动力学模型,Cu²⁺在FGD-HA上的吸附平衡符合Langmuir等温线模型（R²=0.9846）,热力学表明此吸附是自发吸热的过程.利用响应面分析法对Cu²⁺的吸附条件进行优化,得出投加量3.11g/L、pH值4.96、温度22.09℃、Cu²⁺初始浓度24.75mg/L为最佳吸附条件,此条件下Cu²⁺去除率预测值为100%,相同条件下开展的验证实验结果为97.4%,与预测值相接近说明模型的选择是实际可行的.更多还原

【Abstract】 Hydroxyapatite（FGD-HA） was synthesized from waste FGD gypsum using hydrothermal method. FGD-HA was characterized by X-ray diffraction（XRD） and scanning electron microscope（SEM） and investigated as adsorbent for removal Cu²⁺ from wastewater. The sorption kinetics, isotherms and thermodynamics of Cu²⁺ adsorption onto FGD-HA were investigated by batch tests. The kinetic data were evaluated utilizing pseudo-first order and pseudo-second order models, and the experimental data agreed well with the pseudo-second order model due to its relatively high R² value（0.9998）. The equilibrium data were further analyzed by using the Langmuir, Freundlich and Dubinin-Radushkevich models. Equilibrium sorption of Cu²⁺ onto FGD-HA had best fitness with the Langmuir model. Response surface methodology（RSM） was employed to optimize the adsorption process parameters. The optimum operating conditions were determined as dosage of 3.11g/L, pH of 4.96, temperature of 22.09℃, initial concentration of 24.75mg/g, and the removal efficiency for Cu²⁺ was found to be 100%. The verification experiment was also carried out at the same conditions and the result was 97.4%, confirming that the model was effective.更多还原