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采用Freudlish吸附等温式研究了褐煤吸附钯的等温吸附过程,进一步根据Clapeyron-Clausius方程获得了吸附热ΔH=-889.2J.mol-1,由此判定褐煤吸附钯是物理吸附。研究了褐煤吸附钯的影响因素。褐煤吸附钯随pH值增加,平衡吸附量增大。当pH=5～8,水溶液中钯的平衡浓度为10mg.L-1时,褐煤吸附钯的平衡吸附量可达7mg.g-1。得到了褐煤吸附钯的工艺条件:pH=5～8,[Cl-]<50g.L-1吸附。在温度90℃,[H2SO4]2%～5%条件下解吸。
The isothermal adsorption of palladium on lignite was studied by Freudlish adsorption isotherm, and the adsorption heat ΔH = -889.2J · mol-1 was obtained according to the Clapeyron-Clausius equation. The influencing factors of palladium adsorption on lignite were studied. Adsorption of palladium on lignite increased with the increase of pH, and equilibrium adsorption increased. When the equilibrium concentration of palladium in aqueous solution is 10mg.L-1 at pH = 5-8, the equilibrium adsorption capacity of lignite adsorption palladium can reach 7mg.g-1. The process conditions of palladium adsorption on lignite were obtained: pH = 5 ~ 8, [Cl -] <50g.L-1 adsorption. At 90 ℃, [H2SO4] 2% ~ 5% desorption conditions.