三聚磷酸二氢铝吸附Pb~(2+)的动力学研究

采用动态吸附法研究三聚磷酸二氢铝吸附Pb2+的动力学行为并进行吸附活化状态热力学参数分析。结果表明:当三聚磷酸二氢铝粒径小于150μm,搅拌转速大于200 r/min,Pb2+的初始质量浓度为500 mg/L时,三聚磷酸二氢铝对Pb2+的化学吸附反应符合二级反应动力学方程,吸附速率常数k与温度T之间的关系符合Arrhenius公式,吸附活化能Ea=29.34 kJ/mol,吸附频率因子A=62.25 L/(mg.min),ln(k/T)与1/T之间的关系符合Eyring公式,其活化焓ΔH=27.31 kJ/mol,活化熵ΔS=-217.55 J/(mol.K)。

Adsorption kinetics of Pb~(2+) on aluminum dihydrogen tripolyphosphate

The dynamics of adsorption for lead ion by using aluminum dihydrogen tripolyphosphate was studied by means of dynamic adsorption,and the thermodynamic parameters were calculated.The results show that the adsorption of lead ion on aluminum dihydrogen tripolyphosphate is a second order reaction kinetics equation when the particle size of aluminum dihydrogen tripolyphosphate is less than 150 μm,the rotational velocity is more than 200 r/min,and Pb2+ initial mass concentration is 500 mg/L.The relationship between reaction rate constant k and temperature T accords with Arrhenius equation,and the adsorption activation energy Ea is 29.34 kJ/mol,and frequency factor A is 62.25 L/(mg·min).The relationship between ln(k/T) and 1/T accords with Eyring equation,the adsorption activation enthalpy ΔH is 27.31 kJ/mol,and the activation entropy of adsorption ΔS is-217.55 J/(mol·K).