Kinetic and thermodynamic studies on the adsorption of heavy metals from aqueous solution by melanin nanopigment obtained from marine source: Pseudomonas stutzeri

被引:116
作者
Manirethan, Vishnu [1 ]
Raval, Keyur [1 ]
Rajan, Reju [1 ]
Thaira, Harsha [1 ]
Balakrishnan, Raj Mohan [1 ]
机构
[1] Natl Inst Technol Karnataka, Dept Chem Engn, Mangalore 575025, India
关键词
Adsorption; Heavy metals; Isotherms; Melanin; Pseudomonas stutzeri; HEXAVALENT CHROMIUM ADSORPTION; ACTIVATED CARBON; WASTE-WATER; REMOVAL; IONS; EQUILIBRIUM; CR(VI); MERCURY; BIOSORPTION; MEMBRANE;
D O I
10.1016/j.jenvman.2018.02.084
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The difficulty in removal of heavy metals at concentrations below 10 mg/L has led to the exploration of efficient adsorbents for removal of heavy metals. The adsorption capacity of biosynthesized melanin for Mercury (Hg(II)), Chromium (Cr(VI)), Lead (Pb(II)) and Copper (Cu(II)) was investigated at different operating conditions like pH, time, initial concentration and temperature. The heavy metals adsorption process was well illustrated by the Lagergren's pseudo-second-order kinetic model and the equilibrium data fitted excellently to Langmuir isotherm. Maximum adsorption capacity obtained from Langmuir isotherm for Hg(II) was 82.4 mg/g, Cr(VI) was 126.9 mg/g, Pb(II) was 147.5 mg/g and Cu(II) was 167.8 mg/g. The thermodynamic parameters revealed that the adsorption of heavy metals on melanin is favorable, spontaneous and endothermic in nature. Binding of heavy metals on melanin surface was proved by Fourier Transform Infrared Spectroscopy (FT-IR) and X-ray Photoelectron Spectroscopy (XPS). Contemplating the results, biosynthesized melanin can be a potential adsorbent for efficient removal of Hg(II), Cr(VI), Pb(II) and Cu(II) ions from aqueous solution. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:315 / 324
页数:10
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