Author:
Xu Di,Shao Dadong,Chen Changlun,Ren Anping,Wang Xiangke
Abstract
SummaryBentonite has attracted great interest in nuclear waste management because of its outstanding properties. Herein, the sorption and complexation of cobalt on bare bentonite and fulvic acid (FA) coated bentonite are studied, respectively, under ambient conditions. The experiments are carried out atT= 25 ± 2 °C in 0.01 M KNO3solutions. Effect of pH, bentonite concentration, fulvic acid and cobalt solution concentration on cobalt sorption to bentonite is also investigated. The results show that cobalt sorption is strongly pH dependent and weakly bentonite content dependent. The presence of fulvic acid enhances Co2+sorption at low pH values and reduces the sorption of Co2+at high pH values. Effect of addition sequences of Co2+and FA to bentonite suspension on cobalt sorption to FA-bentonite colloids is also studied and the results indicate that the sorption of cobalt on FA coated bentonite is dependent on the addition sequences. The mechanism is discussed by the relative strength between both complexes of Co(II) with sorbed and soluble FA and with bentonite.
Subject
Physical and Theoretical Chemistry
Reference22 articles.
1. Effect of humic acid on the sorption of Cm ( III ) onto γ studied by the time - resolved laser fluorescence spectroscopy;Wang;Radiochim Acta,2004
2. Spectroscopic and structural characterization of a fulvic acid from weathered coal;Tao;Toxicol Environ Chem,1995
3. Complexation of trace metals by adsorbed natural organic matter;Davis;Geochim Cosmochim Acta,1984
4. Effect of ful - vic acids on sorption of U ( VI and IV onto oxides of aluminum , iron and silicon;Tao;Appl Geochem,2000
5. Distinguishing between interlayer and external sorption sites of clay minerals using X - ray absorption spectroscopy;Papelis;Colloid Surf,1996
Cited by
99 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献