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研究新型吸附剂偏磷酸铈对铀酰离子的吸附行为。分别考察了溶液的pH值、温度、接触时间和铀酰离子初始浓度对偏磷酸铈吸附铀酰离子的影响;通过动力学、热力学以及吸附等温线初步研究了吸附机理;最后探究了共存离子和富里酸对吸附的影响。当溶液的pH值为5、温度为30℃、接触时间为60min、铀酰初始浓度为10~(-3)mol/L时为最佳吸附条件,最大吸附量可达到261.78mg/g;动力学研究表明,偏磷酸铈对铀酰离子吸附行为符合准二级动力学方程;Langmuir吸附等温线模型可以更准确的描述铀酰离子在偏磷酸铈上的吸附过程,说明此吸附过程为单分子层吸附;热力学研究表明,偏磷酸铈对铀酰离子的吸附属于吸热反应,反应自发进行,高温促进吸附行为。
The adsorption behavior of uranyl ion by cerium metaphosphate adsorbent was studied. The effects of solution pH value, temperature, contact time and initial concentration of uranyl ion on the uranyl ion adsorption on cerous metaphosphate were investigated. The adsorption mechanism was studied by kinetics, thermodynamics and adsorption isotherms. Finally, the effects of coexisting ions and Effect of fulvic acid on adsorption. When the pH value of the solution is 5, the temperature is 30 ℃, the contact time is 60min, and the initial concentration of uranyl is 10 ~ (-3) mol / L, the optimum adsorption condition is the maximum adsorption capacity can reach 261.78mg / g; Studies have shown that cerium metaphosphate on the uranyl ion adsorption behavior in line with quasi-second-order kinetics equation; Langmuir adsorption isotherm model can be more accurately describe the uranyl ion adsorption on cerium metaphosphate adsorption process, indicating that the adsorption process for the single molecule Layer adsorption; thermodynamic studies have shown that cerium metaphosphate adsorption of uranyl ion belongs endothermic reaction spontaneously, high temperature to promote the adsorption behavior.