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 kinetics was 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) 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 same conditions and the result was 97.4%, confirming that the model was effective.
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. 脱硫石膏基羟基磷灰石对Cu2+吸附性能的研究[J]. 中国环境科学, 2014, 34(8): 2040-2048.
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. Cu2+ removal from wastewater using hydroxyapatite prepared from FGD gypsum. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(8): 2040-2048.