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Reductive Detoxification of Hexavalent Chromium and Degradation of Methyl Tertiary Butyl Ether and Phthalate Esters

Reductive Detoxification of Hexavalent Chromium and Degradation of Methyl Tertiary Butyl Ether and Phthalate Esters


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About the Book

This dissertation, "Reductive Detoxification of Hexavalent Chromium and Degradation of Methyl Tertiary Butyl Ether and Phthalate Esters" by Xiangrong, Xu, 徐向榮, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled REDUCTIVE DETOXIFICATION OF HEXAVALENT CHROMIUM AND DEGRADATION OF METHYL TERTIARY BUTYL ETHER AND PHTHALATE ESTERS Submitted by Xu Xiangrong for the Degree of Doctor of Philosophy at The University of Hong Kong in October 2005 A number of chemical and biological treatment technologies have been developed and examined for detoxification of Cr(VI), methyl tertiary butyl ether (MTBE) and phthalate esters. The reaction kinetics and mechanisms were investigated with advanced instrumentation and analytical techniques. Ascorbic acid was used for the first time in the reductive detoxification of Cr(VI). Effects of vitamin C concentration, pH, temperature and irradiation on the reduction of Cr(VI) were examined. Cr(VI) could be reduced by vitamin C in not only acidic conditions, but also alkaline solutions; furthermore, the reduction of Cr(VI) was shown to occur under both irradiation and also in the dark. The kinetics of Cr(VI) reduction was described quantitatively, and the activation entropy, enthalpy and energy of the reaction were obtained. Fenton reaction was used for the first time in the degradation of MTBE in water. Effects of reaction conditions on the oxidation efficiency of MTBE were examined, and MTBE could be decreased by 99% within 120 min. The major degradation intermediates were identified using purge-and-trap gas chromatography-mass spectrometry (GC-MS), and the reaction mechanism was proposed. Simultaneous decontamination of Cr(VI) and MTBE was studied using UV/TiO process. Effects of pH, TiO dosages, light intensities and the initial concentrations of Cr(VI) on the decontamination were investigated. The results showed that both pollutants Cr(VI) and MTBE could be eliminated simultaneously, and the synergistic effect between oxidation of MTBE and reduction of Cr(VI) was found. The degradation products of MTBE were identified using GC-MS. A pure bacterial culture capable of using di-n-butyl phthalate (DBP) as the sole source of carbon and energy was isolated from mangrove sediment, and identified as Pseudomonas fluorescens B-1. Effects of several environmental factors on the biodegradation were investigated. The kinetics of DBP biodegradation was monitored using HPLC-UV after solid-phase extraction, and could be described using a first-order kinetic model. The major degradation metabolites were identified using GC-MS. Furthermore, inoculation of this strain in the actual seawater also confirmed the degradation efficiency. In addition, this strain was found capable of utilizing n-butyl benzyl phthalate (BBP) as the sole carbon and energy sources. The intermediates of BBP biodegradation were identified and the metabolic pathway was proposed. Simultaneous photocatalytic reduction of Cr(VI) and degradation of DBP was investigated using UV/TiO process. The presence of DBP facilitated Cr(VI) reduction, whereas Cr(VI) accelerated degradation of DBP. The results demonstrated synergy between the oxidation of DBP and reduction of Cr(VI). The intermediate products of DBP degradation were identified using GC-MS, and the reaction mechanism was proposed. In addition, simultaneous detoxification of Cr(VI) and BBP was also studied using UV/TiO process, and the results were similar to those of Cr(VI) and DBP. DOI: 10.5353/th_b3163619 Subjects:


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Product Details
  • ISBN-13: 9781361210031
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 190
  • Weight: 735 gr
  • ISBN-10: 1361210036
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 13 mm
  • Width: 216 mm


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