IJEP 42(4): 490-497 : Vol. 42 Issue. 4 (April 2022)
1. Govt. Nagarjuna Post Graduate College of Science, Department of Chemistry, Raipur- 492 010, Chhattis-garh, India
2. Govt. M.V.P.G. College, Department of Chemistry, Mahasamund- 493 554, Chhattisgarh, India
Abstract
Effective removal of Hg (II) from contaminated soil was carried out using biosorption plant as a derived material. Consequently, a native shrub, Cicer arietinum was observed as the most acceptable biosorbent. The plant biosorbent was observed by different parameters, such as concentration, pH, dosage, temperature, equilibrium time and the appropriate adsorption models. The most favourable pH observed was 4.0 with a contact time of 50 min at room temperature (26±2°C). Data obtained from experiment was well fitted to the graph of adsorption isotherms and the uptake capacity of Hg (II) was noted as 18.91 mg/g in column mode. Concentration of Hg ion was identified using atomic absorption spectrophotometer. It shows that concentration is high near power plant industry (50 m) as 1.901 mg/kg and low away from industry (4500 m) as 0.011 mg/kg. The removal of mercury in bioadsorbent was confirmed by Fourier transform infrared spectroscopy (FTIR). Involvement of hydroxyl (-OH), fluoro (C-F) and alkenes (=CH) group was indicated by the FTIR analysis which shows chelate – metal binding. The bioadsorbent was taken for the removal of Hg (II) in real soil samples collected around power plant industry. It is also remarkable that at the high concentration of 100 mg/L, the bioadsorbent shows about 92% removal. Result found the efficiency of C. arietinum as very good biomass for the removal of Hg (II) from contaminated soil.
Keywords
Mercury (II), Biomass, Adsorption, Column mode, Atomic absorption spectrophotometer, FTIR
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