Exploring the Mechanisms of Biosorption of Cr(VI) by Marine-Derived Penicillium janthinellum P1

文献类型： 外文期刊

第一作者： Chen, Hui-Ying

作者： Chen, Hui-Ying;Lu, Ya-Nan;Yin, Ping-Chuan;Li, Xia;Shan, Yang

作者机构：

关键词： Biosorption; Cr(VI); Penicillium janthinellum; XPS; XRD

期刊名称：INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY （ 影响因子：0.822； 五年影响因子：0.906 ）

ISSN： 1560-8530

年卷期： 2019 年 22 卷 5 期

页码：

收录情况： SCI

摘要： In this study, sorption of Cr(VI) by marine-derived fungus Penicillium janthinellum P1, well known for its multi-heavy-metal tolerance, was examined. First, Haplo-factor method was adopted to optimize key variables, such as temperature, incubation time, initial concentration, bio-smbent dose and pH. The results showed that maximum Cr(VI) biosorption capacity for living fungus P1 pellets was about 87% at the optimum condition of beginning Cr(VI) concentration 250 mg/L, beginning pH 1, temperature of 30 degrees C, biosmbent dosage of 30 g/L and contact time of 8 h, and that maximum Cr(VI) biosorption capacity for non-living fungus P1 pellets was about 58.6% at the optimum condition of beginning Cr(VI) concentration 100 mg/L, initial pH 1, temperature of 30 degrees C, biosmbent dose of 3 g/L and contact time of 12 h. Then studies of kinetic, isotherm and thermodynamics were conducted to acquire an understanding of mechanisms of biosorption processes. The results demonstrated that the biosorption process of Cr(VI) ions followed pseudo-second order kinetic model, and that the biosorption process was fitted well to Freundlich, Dubinin-Radushkevich (D-R) isotherms. In addition, the calculation of thermodynamic parameters indicated that the biosorption of Cr(VI) on P1 pellets was feasible, spontaneous and endothermic. To decipher mechanisms of biosorption, Fourier Translation Infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis were further performed to investigate surface functional groups, cellular morphology and intracellular trace elements etc. (C) 2019 Friends Science Publishers

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