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用新分离真菌黄曲霉（Arthrinium malaysianum）的热干燥生物量从水溶液中去除六价铬（Cr(VI)）：一种机理方法。

Depletion of Cr(VI) from aqueous solution by heat dried biomass of a newly isolated fungus Arthrinium malaysianum: A mechanistic approach.

机构信息

Structural Biology & Bio-Informatics Division, CSIR-Indian Institute of Chemical Biology, Kolkata, 700032, India.

Department of Food Technology and Biochemical Engineering, Jadavpur University, Kolkata, 700032, India.

出版信息

Sci Rep. 2017 Sep 12;7(1):11254. doi: 10.1038/s41598-017-10160-0.

DOI:10.1038/s41598-017-10160-0
PMID:28900147
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5595784/
Abstract

For the first time, the heat dried biomass of a newly isolated fungus Arthrinium malaysianum was studied for the toxic Cr(VI) adsorption, involving more than one mechanism like physisorption, chemisorption, oxidation-reduction and chelation. The process was best explained by the pseudo-second order kinetic model and Redlich-Peterson isotherm with maximum predicted biosorption capacity (Q ) of 100.69 mg g. Film-diffusion was the rate-controlling step and the adsorption was spontaneous, endothermic and entropy-driven. The mode of interactions between Cr(VI) ions and fungal biomass were investigated by several methods [Fourier Transform-Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD) and Energy-Dispersive X-ray spectroscopy (EDX)]. X-ray Photoelectron Spectroscopy (XPS) studies confirmed significant reduction of Cr(VI) into non-toxic Cr(III) species. Further, a modified methodology of Atomic Force Microscopy was successfully attempted to visualize the mycelial ultra-structure change after chromium adsorption. The influence of pH, biomass dose and contact time on Cr(VI) depletion were evaluated by Response Surface Model (RSM). FESEM-EDX analysis also exhibited arsenic (As) and lead (Pb) peaks on fungus surface upon treating with synthetic solutions of NaAsO and Pb(NO) respectively. Additionally, the biomass could also remove chromium from industrial effluents, suggesting the fungal biomass as a promising adsorbent for toxic metals removal.

摘要

首次研究了新分离的真菌 Arthrinium malaysianum 的热干燥生物质对有毒 Cr(VI)的吸附，涉及多种机制，如物理吸附、化学吸附、氧化还原和螯合。该过程最好用伪二阶动力学模型和 Redlich-Peterson 等温线来解释，最大预测生物吸附容量 (Q)为 100.69 mg/g。膜扩散是控制步骤，吸附是自发的、吸热的和熵驱动的。通过几种方法[傅里叶变换红外光谱 (FT-IR)、X 射线衍射 (XRD)和能量色散 X 射线光谱 (EDX)]研究了 Cr(VI)离子与真菌生物质之间的相互作用模式。X 射线光电子能谱 (XPS)研究证实，Cr(VI)被显著还原为无毒的 Cr(III)物种。此外，还成功尝试了原子力显微镜的改良方法，以可视化铬吸附后菌丝体的超微结构变化。通过响应面模型 (RSM)评估了 pH、生物质剂量和接触时间对 Cr(VI)耗尽的影响。FESEM-EDX 分析还显示，在用合成的 NaAsO 和 Pb(NO)溶液处理后，真菌表面出现砷 (As)和铅 (Pb) 峰。此外，该生物质还可以从工业废水中去除铬，表明真菌生物质是一种很有前途的去除有毒金属的吸附剂。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/a0422ae9e92a/41598_2017_10160_Fig8_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/a0422ae9e92a/41598_2017_10160_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/fc93a852e27b/41598_2017_10160_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/12fed21b31b8/41598_2017_10160_Fig2_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/789fdba6fa2a/41598_2017_10160_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/94882741b5e9/41598_2017_10160_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/3f4056ace4c4/41598_2017_10160_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/d389d6467d6e/41598_2017_10160_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6b02/5595784/a0422ae9e92a/41598_2017_10160_Fig8_HTML.jpg

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