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首页> 外文期刊>Environmental Science & Technology >Cr(VI) Removal on Fungal Biomass of Neurospora crassa: the Importance of Dissolved Organic Carbons Derived from the Biomass to Cr(VI) Reduction
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Cr(VI) Removal on Fungal Biomass of Neurospora crassa: the Importance of Dissolved Organic Carbons Derived from the Biomass to Cr(VI) Reduction

机译：Cr（VI）去除神经孢菌的真菌生物质：从生物质衍生的溶解有机碳对Cr（VI）还原的重要性

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摘要

Interactions of toxic Cr(VI) with renewable biomaterials are considered an important pathway for Cr(VI)removal in ecosystems. Biomaterials are susceptible to dissolution, and their dissolved derivatives may provide an alternative to surface-involved pathway for scavenging of Cr(VI). In this study, dissolved organic carbon (DOC) derived from Neurospora crassa biomass was investigated. The proportion of Cr(VI) reduction by DOC to that on biomass was determined to evaluate the importance of DOC to Cr(VI) reduction. A rapid increase in DOC concentration from 145.6 to 193.7 mg L~(-1) was observed when N. crassa-biomass was immersed in 0.01 M KCI solution at pH of 1 -5, and potysaccharides, peotides, and glycoproteins with carboxyl, amide, and -NH functional groups, are the major compositions of DOC. On reaction of 96.2 μM Cr(VI) with N. crassa-biomass or DOC, it was estimated that DOC contributed ～53.8-59.5% of the total Cr(VI) reduction on biomass in the dark. Illumination enhanced Cr(VI) reduction via photo-oxidation of biomass/DOC under aeration conditions, which formed superoxide for Cr(VI) reduction. At pH 1, photoinduced Cr(VI) reduction by DOC proceeded more rapidly than reduction on the biomass surface. However, at pH >3, with a decrease in Cr(VI) reduction by DOC, photon-excited biomass may become an important electron source for Cr(VI) photoreducton.
机译：有毒的六价铬与可再生生物材料的相互作用被认为是生态系统中六价铬去除的重要途径。生物材料很容易溶解，其溶解的衍生物可能为清除Cr（VI）的表面相关途径提供替代方法。在这项研究中，研究了来自神经孢霉生物质的可溶性有机碳（DOC）。确定DOC还原Cr（VI）与生物质上Cr（VI）的比例，以评估DOC对Cr（VI）还原的重要性。将猪笼草生物量浸入pH值为1 -5的0.01 M KCI溶液中，以及带有羧基，酰胺基的糖类，肽类和糖蛋白时，DOC浓度从145.6毫克迅速增加至193.7毫克L〜（-1）。和-NH官能团是DOC的主要成分。在96.2μMCr（VI）与猪笼草生物量或DOC反应后，估计DOC在黑暗中对生物量的总Cr（VI）还原贡献率为〜53.8-59.5％。照明在曝气条件下通过生物质/ DOC的光氧化增强了Cr（VI）的还原，这形成了Cr（VI）还原的超氧化物。在pH值为1时，通过DOC进行光诱导的Cr（VI）还原要比在生物质表面进行还原更快。然而，在pH> 3时，随着DOC对Cr（VI）的还原作用降低，光子激发的生物质可能成为Cr（VI）光还原剂的重要电子源。

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  • 来源
    《Environmental Science & Technology》 |2010年第16期|p.6202-6208|共7页
  • 作者

    L.C. HSU; S.L. WANG; Y.C. LIN; M.K. WANG; P.N. CHIANG; I.C. LIU; W.H. KUAN; C.C. CHEN; Y.M. TZOU;

  • 作者单位

    Department of Soil & Environmental Sciences. National Chung Hsing University, Taichung, TW, 40227;

    rnDepartment of Soil & Environmental Sciences. National Chung Hsing University, Taichung, TW, 40227;

    rnDepartment of Soil & Environmental Sciences. National Chung Hsing University, Taichung, TW, 40227;

    rnDepartment of Agricultural Chemistry, National Taiwan University, Nantou, TW, SS743;

    rnThe Experimental Forest, National Taiwan University, Nantou, TW, SS743;

    rnAgricultural Research Institute No. 189. Jhongjheng Rd., Wufong, Taichung County, TW 41301;

    rnDepartment of Safety, Health, and Environmental Engineering Ming Chi University, Taishan, Taipei 24301;

    rnDepartment of Life Science, National Taiwan Normal University, Taipei, TW 116;

    rnDepartment of Soil & Environmental Sciences. National Chung Hsing University, Taichung, TW, 40227;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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