【摘要】 :研究了氧化铝自水溶液中对Eu(Ⅲ )离子的吸附和解吸附规律 .结果表明 :①吸附等温线服从Lang muir极限公式 ,吸附过程为焓驱动的放热、熵减的自发过程 ;②吸附服从Lagergren一级动力学方程 ,表观活化能为 43.43kJ·mol-1,属内扩散控制 ;③溶液pH值对吸附影响显著 ,S形曲线的突跃范围为pH =4.0～ 6 .5 ;④微波和超声波能明显加快解吸和提高解吸率 ,用 0 .1mol·L-1HNO3 在微波下解吸 30min ,解吸率达 96 % .更多还原

【Abstract】 Adsorption and desorption of Eu(Ⅲ) ion from aqueous solution onto alumina were studied at various conditions.The results show: ①The adsorption isotherm fits in with the Limited Langmuir equation,and the adsorption is a spontaneous,exothermal and decreasing entropy process;②The adsorption obeys the first order kenitic equation Lagergren mode,the activation energy for adsorption process is 43.43?kJ·mol -1 ,and the rate conteolling step is the intraparticle diffusion of Eu(Ⅲ) ion within the pores of alumina;③The pH value of solution effects obviously on the adsorption of Eu(Ⅲ) ion,the adsorption edge is at pH=4.0—6.5;④In supersonic or microwave,the desorption of Eu(Ⅲ) ion from allumina have been greatly speeded up,and the percenterge of desoption is increased to 96% (in microwave).更多还原