煤矿排水沉淀物作为一种新的吸附剂对重金属吸附作用的动力学与热力学研究解读.pptx

Kinetic and thermodynamic studies of the adsorption of heavy metals on to a new adsorbent:coal mine drainage sludge 煤矿排水沉淀物作为一种新的吸附剂对重金属吸附作用的动力学与热力学研究 ABSTRACT 摘要 In this study, we investigated the application of sludge waste obtained from a coal mine drainage treatment facility that treats acid mine drainage (designated as AMD) from metal-mine water. The coal mine drainage sludge (designated as CMDS), which contained 70% goethite and 30% calcite, was utilized as a sorption material for Cu(II) and Zn(II) removal from an aqueous solution of metallic mine drainage. 这本次研究中，我们研究了来自于煤矿处理厂的沉淀废物的应用，用这种沉淀废物处理来自于金属矿山排水中的酸性矿物废水（简称为AMD）。这种煤矿排水沉淀物（简称为CMDS），它包含了70%的针铁矿和30%的方解石，被利用作为一种吸附移除来自金属矿山废水中的Cu（II）和Zn（II）。 The equilibriums and kinetics were investigated during a series of batch adsorption experiments. The Langmuir model was used to fit the equilibrium data, resulting in the best fits. The removal efficiencies were controlled by solution pH, temperature, initial concentration of heavy metal, sorbent amount and contact time. The pseudo-second-order kinetic model was used to fit the kinetic data, providing a good correlation with the experimental data. 在整个分批吸附实验中都用到了热力学和动力学平衡的研究。结果显示：Langumir模型能够很好的拟合热力学平衡数据。整个吸附过程中移除效率由溶液的pH值，温度，重金属溶液的初始浓度，吸附剂数量以及接触时间所控制。而拟二级动力学方程能够很好的拟合动力学数据，并且显示了与实验数据的一个很好的关联度。 The results of a thermodynamic study showed that the activation energies (EA) were 3.75 and 1.75 kJ mol?1for the adsorption of Cu(II) and Zn(II)on to CMDS at pH 5.5. These values of activation energy could correspond to physisorption. The positive values obtained for both the standard enthalpy change,△0, and the standard entropy change,S0, suggest that the adsorption of Cu(II) and Zn(II) on to the CMDS was an endothermic reaction and that randomness increased at the solid–liquid interface during the adsorption of Cu(II) and Zn(II) on to the CMDS. The adsorption process also followed a pseudo-second-order kinetic model. 本次热力学研究表明：吸附剂CMDS在pH=5.5时，对Cu（II）和Zn（II）的吸附的活化能（EA）为3.