Heavy metal biosorption from aqueous solutions by algae inhabiting rice paddies in Vietnam. Issue 2 (June 2016)

• Record Type: Journal Article
• Authors: Tran, Hang Thi; Vu, Ngo Dinh; Matsukawa, Masahito; Okajima, Maiko; Kaneko, Tatsuo; Ohki, Kaori; Yoshikawa, Shinya
• Is Part Of: Journal of environmental chemical engineering. Volume 4:Issue 2(2016:Jun.)
• Page Start: 2529
• Page End: 2535
• Publication Date: 2016-06
• Subjects: Heavy metal removal -- Algae -- Biosorption -- Desorption; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2016.04.038
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: The gelatinous colonies collected from rice fields in Phu Tho Province, Viet Nam (Al-VN) were investigated to remove heavy metal ions from water for the first time. The biosorption of Cu 2+, Cd 2+ and Pb 2+ by dried Al-VN was tested at various pHs, temperatures, contact times, biosorbent doses and initial metal ion concentrations under laboratory conditions. Metal ion adsorptions on Al-VN were strongly dependent on pH, with the optimum pH for adsorption of Cu 2+, Cd 2+ and Pb 2+ solutions being 4, 5–7 and 5–6, respectively. The biosorption capacity of metal ions by Al-VN was independent of temperature. After one hour of contact time, the adsorption capacity reached equilibrium. The maximum adsorption capacity (qm ) of Cu 2+, Cd 2+ and Pb 2+ was 27.78, 28.57 and 76.92 mg/g, respectively. Both the Langmuir and Freundlich adsorption models were suitable for biosorption of Cu 2+, Cd 2+ and Pb 2+ by Al-VN. The desorption studies indicated that 0.1 M HNO3 was an efficient desorbent for recovery of Cu 2+, Cd 2+ and Pb 2+, and the maximum desorption was >90%. These results indicate that Al-VN can be used as an efficient and economic biosorbent for the removal and recovery of toxic heavy metal ions from polluted water.