Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram (Cicer arientinum)

被引:194
作者
Ahalya, N.
Kanamadi, R. D.
Ramachandra, T. V. [1 ]
机构
[1] Indian Inst Sci, Ctr Ecol Sci, Energy & Wetlands Res Grp, Bangalore 560012, Karnataka, India
[2] Karnatak Univ, Dept Zool, Dharwad 580003, Karnataka, India
来源
ELECTRONIC JOURNAL OF BIOTECHNOLOGY | 2005年 / 8卷 / 03期
关键词
agro-wastes; Bengal gram husk (bgh); Cicer arientinum; chromium biosorption; isotherms; fourier transform infrared spectroscopy (FTIR);
D O I
10.2225/vol8-issue3-fulltext-10
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The potential to remove Cr (VI) from aqueous solutions through biosorption using the husk of Bengal gram (Cicer arientinum), was investigated in batch experiments. The results showed removal of 99.9% of chromium in the 10 mgl(-1) chromium solution, the biomass required at saturation was 1 g mg(-1). Kinetic experiments revealed that the dilute chromium solutions reached equilibrium within 180 min. The biosorptive capacity of the (bgh) was dependent on the pH of the chromium solution, with pH 2 being optimal. The adsorption data fit well with the Langmuir and Freundlich isotherm models. The adsorption capacity calculated from the Langmuir isotherm was 91.64 mg Cr (VI)/g at pH 2. The adsorption capacity increased with increase in agitation speed and an optimum was achieved at 120 rpm. The biosorption of Cr (VI) was studied by Fourier transform infrared spectroscopy (FTIR), which suggested that the presence of Cr (VI) ions in the biomass affects the bands corresponding to hydroxyl and carboxyl groups. Comprehensive characterisation of parameters indicates bgh to be an excellent material for biosorption of Cr (VI) to treat wastewaters containing low concentration of the metal.
引用
收藏
页码:258 / 264
页数:7
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