期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 186, 期 2-3, 页码 2138-2143出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.12.123
关键词
Phanerochaete chrysosporium; Polyethylenimine; Modification; Mycelial pellet; Cr(VI) biosorption
资金
- National Natural Science Foundation of China [50908078, 50978088, 51039001]
- Research Fund for Doctoral Program of Higher Education of China [20070532058]
- National Key Science and Technology Project for Water Environmental Pollution Control [2009ZX07212-001-02, 2009ZX07212-001-06]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0719]
- National Basic Research Program (973 Program) [2005CB724203]
- Hunan Key Scientific Research Project [2009FJ1010]
- Hunan Provincial Natural Science Foundation of China [10JJ7005]
To improve the removal efficiency of heavy metals from wastewater, the surface of a fungal biomass was modified to obtain a high-capacity biosorbent for Cr(VI) in wastewater. The effects of pH, initial concentration, and sorption time on Cr(VI) removal by polyethylenimine (PEI)-modified Phanerochaete chrysosporium were investigated. The biomass adsorption capacity was significantly dependent on the pH of the solution, and the optimum pH was approximately 3.0. The maximum removal for Cr(VI) was 344.8 mg/g as determined with the Langmuir adsorption isotherm. Pseudo-first-order Lagergren model is better than pseudo-second-order Lagergren model when simulating the kinetic experiment results. Furthermore, an amount of Cr(VI) was reduced to Cr(III), indicating that some reactions occurred on the surface of the biomass leading to the reduction of Cr(V1). The point of zero potential for the modified biomass increased from an initial pH of 3.0 to a much higher value of 10.8, indicating that the PEI-modified biomass is better than the pristine biomass for adsorption of anionic adsorbates. Results showed that the PEI-modified biosorbent presented high efficiency in treating Cr(VI)-contaminated wastewater. (C) 2011 Elsevier B.V. All rights reserved.
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