Lead adsorption and arsenite oxidation by cobalt doped birnessite

In order to study the effects of transition metal ions on the physic-chemical properties of manganese dioxides as environmental friendly materials, three-dimensional nano-microsphere cobalt-doped birnessite was synthesized by reduction of potassium permanganate by mixtures of concentrated hydrochlor...

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Bibliographic Details
Published inHuanjing kexue Vol. 32; no. 7; p. 2092
Main Authors Yin, Hui, Feng, Xiong-Han, Qiu, Guo-Hong, Tan, Wen-Feng, Liu, Fan
Format Journal Article
LanguageChinese
Published China 01.07.2011
Subjects
Adsorption
Arsenic - chemistry
Arsenites - isolation & purification
Cobalt - chemistry
Environmental Pollution - prevention & control
Lead - isolation & purification
Manganese Compounds - chemistry
Microspheres
Nanoparticles - chemistry
Oxidation-Reduction
Oxides - chemistry
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Summary:In order to study the effects of transition metal ions on the physic-chemical properties of manganese dioxides as environmental friendly materials, three-dimensional nano-microsphere cobalt-doped birnessite was synthesized by reduction of potassium permanganate by mixtures of concentrated hydrochloride and cobalt (II) chloride. Powder X-ray diffraction, chemical analysis, N2 physical adsorption, field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectra (XPS) were used to characterize the crystal structure, chemical composition and micro-morphologies of products. In the range of molar ratios from 0.05 to 0.20, birnessite was fabricated exclusively. It was observed that cobalt incorporated into the layers of birnessite and had little effect on the crystal structure and micromorpholgy, but crystallinity decreased after cobalt doping. Both chemical analysis and XPS results showed that manganese average oxidation state decreased after cobalt doping, and the percentage of Mn3+ increased.
ISSN:0250-3301