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以工业废弃煤渣为原料,采用负载法制备了氯化钙改性煤渣除氟吸附剂(Ca MC),研究了Ca MC对F-的等温吸附特征、吸附动力学和热力学。结果表明,表观2级动力学模型能够很好地描述Ca MC对F-的吸附过程,吸附速率由液膜扩散控制。Ca MC对F-的吸附符合Langmuir吸附等温方程,293 K时Ca MC对F-的最大吸附量达到97.09mg/g。热力学参数表明F-在Ca MC上的吸附是自发的放热过程,吸附主要是氢键力和偶极间作用力共同作用下的物理吸附。
Industrial waste cinder was used as raw material to prepare calcium fluoride modified coal slag de-fluorination adsorbent (Ca MC) by load method. The isothermal adsorption characteristics, adsorption kinetics and thermodynamics of Ca-F were studied. The results show that the apparent second-order kinetic model can well describe the adsorption process of F- by Ca MC, and the adsorption rate is controlled by liquid film diffusion. The adsorption of F- by Ca MC accords with the Langmuir adsorption isotherm equation, and the maximum adsorption capacity of Ca MC to F- at 293 K is 97.09 mg / g. The thermodynamic parameters show that F-adsorption on Ca MC is a spontaneous exothermic process. The adsorption is mainly physical adsorption under the interaction of hydrogen bond force and dipole force.