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Adsorption of Heavy Metal onto the Extracellular Polysaccharide Produced by the Purple Nonsulfur Photosynthetic Bacteria Rhodopseudomonas sp. KH4  

Jeong, Jeong-Hwa (Department of Biological Engineering, Kyonggi University)
Seo, Pil-Soo (Department of Korea biological resourse center, Kyonggi University)
Kong, Sung-Ho (Department of Chemical Engineering, Hanyang University)
Lee, Jong-Yeol (Beautiful Environmental Construction Co., Ltd.)
Lee, Sang-Seob (Department of Biological Engineering, Kyonggi University)
Publication Information
Korean Journal of Microbiology / v.42, no.4, 2006 , pp. 326-331 More about this Journal
Abstract
In the present study, we examined biosorption characteristics of heavy metals onto the extracellular polysaccharide (EPS) produced by the purple nonsulfur photosynthetic bacteria Rhodopseudomonas sp. KH4, which was isolated from a stream in Anyang, Kyonggi-Do. When Cd (100 mg/L) and Cu (100 mg/L) were added to EPS (1.0 g/L) in the optimal condition (Cd; pH 8, Cu; pH 5, $40^{\circ}C$), 84.2 mg/L of Cd and 70.0 mg/L of Cu were adsorbed within 30 min and 10 min, respectively. When 100 mg/L of Cd and Cu were present as mixture, 16.8 mg/L of Cd and 48.7 mg/L of Cu were adsorbed at $25^{\circ}C$, pH 5. The maximum adsorption capacity determined by fitting Langmuir isotherms model was suitable for describing the biosorption of Cd (76.9 mg/g) and Cu (67.1 mg/g) by EPS. The neutral monosaccharide in the EPS determined by GC consisted of arabinose (2.4%), glucose (7.1%) and mannose (90.5%).
Keywords
biosorption; cadmium; copper; EPS (extracellular polysaccharide); heavy metal;
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