title: A Comparative Study on the Biosorption of Cd2+ onto Paecilomyces lilacinus XLA and Mucoromycote sp. XLC.
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(-1) of 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.
authors.affiliation: State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China. lovenicko0618@163.com.
authors.forename: Lu
authors.initials: L
authors.lastname: Xia
authors.affiliation: State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China. xuxingjian@iga.ac.cn.|Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China. xuxingjian@iga.ac.cn.
authors.forename: Xingjian
authors.initials: X
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China. heiguangye@163.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China. qyhuang@mail.hzau.edu.cn.|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. qyhuang@mail.hzau.edu.cn.
authors.forename: Qiaoyun
authors.initials: Q
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China. wlchen@mail.hzau.edu.cn.
authors.forename: Wenli
authors.initials: W
authors.lastname: Chen
mesh_terms: D001673:Biodegradation, Environmental; D002104:Cadmium / Q000378:metabolism* / Q000633:toxicity; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000378:metabolism / Q000633:toxicity; D008826:Microbial Sensitivity Tests; D008855:Microscopy, Electron, Scanning; D010143:Paecilomyces / Q000187:drug effects / Q000378:metabolism*; D056951:Photoelectron Spectroscopy; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000378:metabolism* / Q000633:toxicity
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Cd2+; biosorption; cadmium; desorption; filamentous fungi