Preparation and characterization of new foam adsorbents of poly(vinyl alcohol)/chitosan composites and their removal for dye and heavy metal from aqueous solution

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[1] Li, Xiaoli
[2] Li, Yanfeng
[3] Zhang, Sidi
[4] Ye, Zhengfang
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Li, Y. (liyf@lzu.edu.cn) | 1600年 / Elsevier B.V.卷 / 183期
关键词：
A novel composite foam of poly(vinyl alcohol) (PVA) and chitosan (CS); i.e. PVA/CS composites; was prepared as an adsorbent for the removal of malachite green (MG) and Cu2+ from aqueous solution. The PVA/CS composite foam held the advantages of PVA and CS. The introduction of CS improved significantly the adsorption capacities of Cu2+ and MG. The resulting foam with the interconnected pores exhibited good mass transfer property; processing properties and stability. Meanwhile; PVA/CS foam adsorbents had been proved with the excellent adsorption and fast kinetics for MG and Cu2+. However; MG and Cu2+ in binary system exhibited competitive adsorption. The adsorption isotherms; kinetics and thermodynamics of PVA/CS foams for MG and Cu2+ were studied in detail; moreover; the effects of ionic strength and foreign pollutants were also investigated. Additionally; desorption and reusability of PVA/CS foam was also investigated based on sequential adsorption-desorption cycles. PVA/CS foam adsorbents could simultaneously remove MG and Cu2+ when they existed at low concentrations (2+ from aqueous solutions due to its simple preparation; high adsorption capacity; fast adsorption rate; ionic strength independence; easy separation and good reusability. These properties are of potential application in the up-flow adsorption column for the removal of organic dye and heavy metal. © 2011 Elsevier B.V;
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