【摘要】 通过水热法制备了SO₄^2-插层的钙铝水滑石（CaAl-SO₄-LDH）,采用XRD,FTIR,SEM,ICP-OES等方法对制备的CaAl-SO₄-LDH进行表征,探究了CaAl-SO₄-LDH超稳矿化Cd²⁺的动力学和热力学过程。实验结果表明,CaAl-SO₄-LDH对Cd²⁺的超稳矿化过程符合准二级动力学模型,当Cd²⁺初始质量浓度为50 mg/L时,线性相关系数为0.998 1;Ca Al-SO₄-LDH对Cd²⁺的超稳矿化过程符合Langmuir模型,表明该矿化过程以化学作用为主,在CaAl-SO₄-LDH层板上发生了同晶取代;CaAl-SO₄-LDH对Cd²⁺的矿化过程是一个可自发进行的吸热反应,升高温度有利于超稳矿化过程的进行。更多还原

【Abstract】 Sulfate intercalated calcium aluminum hydrotalcite（CaAl-SO₄-LDH） was synthesized via hydrothermal method and characterized by XRD,FTIR,SEM and ICP-OES. The kinetic and thermodynamic processes of ultra-stable mineralization of Cd²⁺ on CaAl-SO₄-LDH were explored.The experimental results show that the ultra-stable mineralization process of Cd²⁺ on CaAl-SO₄-LDH conforms to the quasi-second-order kinetic model and the linear correlation coefficient is 0.998 1 when the initial mass concentration of Cd²⁺ is 50 mg/L. The mineralization process also conforms to the Langmuir model,which indicates that the mineralization process is dominated by chemical action,and isomorphous substitution occurs on the CaAl-SO₄-LDH laminate. The mineralization process is a spontaneous endothermic reaction,and can benefit from the increasing temperature.更多还原