Silver-complexed chitosan microparticles for pesticide removal

Two types of chitosan microparticles (CMs) and their silver-complexes CMs (SCMs) were prepared using different crosslinking agents, i.e. glutaraldehyde and epichlorohydrin, in order to investigate the adsorption and release behaviors of a typical pesticide, methyl parathion (MP). The pH and concentr...

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Bibliographic Details
Published inReactive & functional polymers Vol. 44; no. 1; pp. 47 - 54
Main Authors Yoshizuka, Kazuharu, Lou, Zhengrong, Inoue, Katsutoshi
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 14.04.2000
Elsevier Science
Subjects
Adsorption
Applied sciences
Chitosan microparticle
Exact sciences and technology
Natural polymers
Pesticide
Physicochemistry of polymers
Release
Silver
Starch and polysaccharides
Chitosan microparticle
Silver
Adsorption
Pesticide
Release
Parathion
Liquid solid adsorption
Epichlorhydrin
Adsorption isotherm
Pesticides
Adsorption capacity
Metal ion
Template reaction
Crosslinking
Glutaral
Experimental study
Microparticles
Chitosan derivatives
Aqueous medium
Preparation
Crosslinked polymer
pH
Oside polymer
Silver ion
Chitosan
Adsorbent
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Summary:Two types of chitosan microparticles (CMs) and their silver-complexes CMs (SCMs) were prepared using different crosslinking agents, i.e. glutaraldehyde and epichlorohydrin, in order to investigate the adsorption and release behaviors of a typical pesticide, methyl parathion (MP). The pH and concentration dependencies on Ag(I) and MP adsorptions on both the CMs and SCMs were studied. The epichlorohydrin-crosslinked CM apparently showed the superiority of Ag(I) adsorption over the glutaraldehyde-crosslinked CM, nevertheless, adsorption behavior of MP on SCM derived from each CM was observed vice versa. Release behavior of MP from the MP-loaded SCMs was also observed in aqueous acetic acid and sodium acetate buffer solutions at low pH as well as in those containing two kinds of ammonium reagents. The aqueous solutions containing ammonium thiocyanide and ammonia could be applied for MP release from the MP-loaded SCMs without Ag(I) leakage from the particles. Furthermore, from the iteration of adsorption and release experiments of MP, glutaraldehyde-crosslinked SCM provides good reusability for MP removal.
ISSN:1381-5148
DOI:10.1016/S1381-5148(99)00076-0