Adsorption of chromium by exopolysaccharides extracted from lignolytic phosphate solubilizing bacteria

化学 弗伦德利希方程 傅里叶变换红外光谱 吸附 核化学 朗缪尔 生物吸附 朗缪尔吸附模型 色谱法 吸附 有机化学 化学工程 工程类
作者
Saranya Kailasam,S. Arumugam,Kanimozhi Balaji,Swarna V. Kanth
出处
期刊:International Journal of Biological Macromolecules [Elsevier BV]
卷期号:206: 788-798 被引量:14
标识
DOI:10.1016/j.ijbiomac.2022.03.047
摘要

In the present study, exopolysaccharide (EPS) producing phosphate solubilizing bacterium, Enterobacter soli was screened from rhizospheres soils of mangrove environment. The enhanced production of EPS by Enterobacter soli (EsEPS) was obtained by optimization of cultural conditions, maximum production (3.86 ± 0.03 g/L) was obtained at pH 6.0 and 1% sucrose as carbon source. Biochemical composition of EsEPS was found as 72.83% of carbohydrate and 8.52% of protein. Structural characteristics of EsEPS were investigated using Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR) and Dynamic Light Scattering (DLS), High Pressure Liquid Chromatography (HPLC) and Matrix-Assisted Laser Desorption/Ionization-Time of Flight (MALDI-TOF). The EsEPS exhibited effective removal of Cr and the highest metal adsorption was found at 6.0 pH. Freundlich and Langmuir isotherm models deployed to determine Cr adsorption ability of EsEPS. Langmuir isotherm fitted well than Freundlich model, maximum adsorption (Qmax) value was 460.82 mg/g. Morphological and structural changes of EsEPS with Cr was characterized using FTIR, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS). FTIR results showed changes in wave numbers of functional groups involved in metal adsorption. The SEM micrograph showed changes in surface morphology of EsEPS as the concentration of Cr increased. EDS reports revealed an increasing concentration of Cr involved in the reduction of organic elements of EsEPS. The current study exemplifies the EPS production capacity of E. Soli bacterium and demonstrated effective Cr-removal by EPS through biosorption.
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