https://scholars.lib.ntu.edu.tw/handle/123456789/356627
標題: | Cr(VI) Removal on Fungal Biomass of Neurospora crassa: the Importance of Dissolved Organic Carbons Derived from the Biomass to Cr(VI) Reduction | 作者: | Hsu, LC SHAN-LI WANG Lin, YC Wang, MK Chiang, PN Liu, JC Kuan, WH Chen, CC Tzou, YM |
公開日期: | 2010 | 卷: | 44 | 期: | 16 | 起(迄)頁: | 6202-6208 | 來源出版物: | Environmental Science & Technology | 摘要: | Interactions of toxic Cr(VI) with renewable biomaterials are considered an important pathwayfor 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 KCl solution at pH of 1-5, and polysaccharides, peptides, 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) photoreduction. © 2010 American Chemical Society. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/356627 | DOI: | 10.1021/es1017015 | SDG/關鍵字: | Cr reductions; Dissolved organic carbon; Fungal biomass; Neurospora crassa; Photo-induced; Photo-reduction; Superoxides; Amides; Biological materials; Biomass; Chromium compounds; Dissolution; Ecology; Functional groups; Organic carbon; Oxygen; Proteins; Stream flow; Chromium; amide; carboxyl group; chromium; dissolved organic matter; glycoprotein; organic carbon; peptide; polysaccharide; superoxide; aeration; biomass; chromium; concentration (composition); dissolution; dissolved organic carbon; fungus; photodegradation; pollutant removal; protein; reduction; scavenging (chemistry); toxic material; aeration; article; concentration (parameters); controlled study; dissolution; electron; fungal biomass; Neurospora crassa; nonhuman; pH; photon; photooxidation; Biodegradation, Environmental; Biomass; Carbon; Chromium; Darkness; Hydrogen-Ion Concentration; Kinetics; Magnetic Resonance Spectroscopy; Neurospora crassa; Organic Chemicals; Oxidation-Reduction; Solubility; Spectroscopy, Fourier Transform Infrared; Time Factors; Neurospora crassa |
顯示於: | 農業化學系 |
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