摘要
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 process of palladium adsorbed on lignite was investigated by the isothermal adsorption equation of Freudlish, and the adsorption heat （△H） calculated using Chapeyron-Clausius equation was - 889.2 J·mol^ - 1, which indicated that the adsorption process was physical adsorption. The studies of influence factors for the adsorption were carried out. The adsorption of palladium on lignite increased with pH increase. The adsorption of palladium on lignite might achieve 7 mg·g^- 1, when the equilibrium concentration of palladium in the aqueous solution was 10 mg·L^-1 at pH = 5 -8. The obtained optimum adsorption conditions were pH =5 -8, [Cl^- [ 〈50 g·L^-1, and desorption conditions were temperature of 90 ℃, [ H2SO4] 2% -5%.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2009年第3期415-419,共5页
Chinese Journal of Rare Metals
关键词
褐煤
吸附
解吸
钯
lignite
adsorption
desorption
palladium
