Preparation of macroporous bead adsorbents based on poly(vinyl   alcohol)/chitosan and their adsorption properties for heavy metals from   aqueous solution

doi:10.1016/j.cej.2011.10.012

CORC > 北京大学 > 环境科学与工程学院

	Preparation of macroporous bead adsorbents based on poly(vinyl alcohol)/chitosan and their adsorption properties for heavy metals from aqueous solution
	Li, Xiaoli ; Li, Yanfeng ; Ye, Zhengfang
刊名	chemical engineering journal
	2011
关键词	PVA/CS bead adsorbents MR bead Adsorption Heavy metals removal COMPETITIVE ADSORPTION CADMIUM ADSORPTION CHELATING RESIN WASTE-WATER REMOVAL LEAD IONS BIOSORPTION CU(II) CU
DOI	10.1016/j.cej.2011.10.012
英文摘要	A novel macroporous bead adsorbents based on poly(vinyl alcohol)/chitosan (PVA/CS beads) were prepared, characterized and were used for the adsorption of heavy metal ions from aqueous solution. The resulting PVA/CS beads were perfectly spherical in shape and exhibited good mechanical strength and chemical stability. PVA/CS beads with macroreticular structure had been proved with easy separation and excellent adsorption for heavy metal ions. PVA/CS beads adsorbed heavy metal ions in the following order: Cu(2+) > Pb(2+) > Cd(2+) > Zn(2+). The equilibrium data of Cu(2+), Pb(2+) and Cd(2+) conformed to the Freundlich isotherm, while those of Zn(2+) were best described by Langmuir isotherm. The presence of NaNO(3) (0-0.137 mol/L) had little effect on Cu(2+) adsorption, but the adsorption of Pb(2+), Zn(2+) and Cd(2+) decreased significantly in the same conditions. The competitive adsorption showed that PVA/CS beads had higher adsorption selectivity for Cu(2+) with the coexistence of Pb(2+), Zn(2+) or Cd(2+). The adsorption kinetics of Cu(2+), Pb(2+), Zn(2+) and Cd(2+) were found to follow the pseudo-second-order kinetic model. Various thermodynamic parameters were calculated and the results showed that the adsorption of all metal ions onto PVA/CS beads was feasible and endothermic in nature. The results from the sequential adsorption-desorption cycles showed that PVA/CS bead adsorbents held good desorption and reusability, which would be a potential application in the fixed-bed continuous-flow column for the removal of heavy metals. (C) 2011 Elsevier B.V. All rights reserved.; Engineering, Environmental; Engineering, Chemical; SCI(E); EI; 37; ARTICLE; 60-68; 178
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/236887]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Li, Xiaoli,Li, Yanfeng,Ye, Zhengfang. Preparation of macroporous bead adsorbents based on poly(vinyl alcohol)/chitosan and their adsorption properties for heavy metals from aqueous solution[J]. chemical engineering journal,2011.
APA	Li, Xiaoli,Li, Yanfeng,&Ye, Zhengfang.(2011).Preparation of macroporous bead adsorbents based on poly(vinyl alcohol)/chitosan and their adsorption properties for heavy metals from aqueous solution.chemical engineering journal.
MLA	Li, Xiaoli,et al."Preparation of macroporous bead adsorbents based on poly(vinyl alcohol)/chitosan and their adsorption properties for heavy metals from aqueous solution".chemical engineering journal (2011).