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Int. J. Mol. Sci. 2015, 16(7), 15670-15687; doi:10.3390/ijms160715670

A Comparative Study on the Biosorption of Cd2+ onto Paecilomyces lilacinus XLA and Mucoromycote sp. XLC

1,†
,
1,2,†
,
1
,
1,3,* and 1,*
1
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
2
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
3
Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Ji-Dong Gu
Received: 31 March 2015 / Revised: 18 May 2015 / Accepted: 25 May 2015 / Published: 10 July 2015
View Full-Text   |   Download PDF [3577 KB, uploaded 10 July 2015]   |  

Abstract

The filamentous fungi XLA and XLC isolated from Cd-contaminated soil were identified morphologically and phylogenetically as Paecilomyces lilacinus and Mucoromycote sp., respectively. The minimum inhibitory concentrations (MICs) of Cd2+, Co2+, Cu2+, Zn2+, Cr3+ and Cr6+ in minimum mineral (MM) medium agar plates were 29,786, 2945, 9425, 5080, 1785 and 204 mg·L−1 for XLA and 11,240, 884, 9100, 2540, 3060 and 51 mg·L−1 for XLC, respectively. Favorable biosorption conditions for adsorption of Cd2+ by the tested fungi were investigated. Efficient performances of the biosorbents were described using Langmuir isotherm model, and the predicted maximum biosorption capacities for Cd2+ were 77.61 mg·g−1 of XLA and 79.67 mg·g−1of XLC. Experiments on desorption potential of biosorbents validated their efficacy at a large scale. Results showed that XLA obtained a desorption rate of 84.7% by 2% EDTA and XLC gained a desorption rate of 78.9% by 0.1 M HCl. Analysis by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) and X-ray photoelectron spectroscopy (XPS) suggested that groups of C–N, COO– for XLA and C–N, CH2 and phosphate for XLC were the dominant binding sites for Cd2+ biosorption. Our results indicated that the fungus XLA, rather than XLC, could potentially be used as an inexpensive, eco-friendly and effective bioremediation agent for the removal of Cd2+ from wastewater. View Full-Text
Keywords: filamentous fungi; Cd2+; biosorption; desorption; cadmium filamentous fungi; Cd2+; biosorption; desorption; cadmium
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Xia, L.; Xu, X.; Zhu, W.; Huang, Q.; Chen, W. A Comparative Study on the Biosorption of Cd2+ onto Paecilomyces lilacinus XLA and Mucoromycote sp. XLC. Int. J. Mol. Sci. 2015, 16, 15670-15687.

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