Degradation Of MTBE By GDP And Chitosan Modification For Dyes Removal

The application of low temperature plasma technology in the treatment of water and wastewater are reviewed, and the emphasis of discussion is put on the glow discharge plasma (GDP) a novel kind of advanced oxidation processes that is water treatment developed in recent years. On the basis of the present research situation of the glow discharge plasma (GDP) water treatment, the research task of this work was proposed. The contents of the dessertation mainly include three parts: Various experimental parameters in degradation of Methyl tert-Butyl Ether (MTBE) in water by Glow Discharge Plasma and calculated energy efficiency of GDP; the formation of hydrogen peroxide and hydroxyl radical during GDP treatment under different currents and kinetics and mechanism of the glow discharge plasma (GDP) of Methyl tert-Butyl Ether (MTBE); Plasma modified chitosan and the adsorption of wastewater containing dyes AR73 Treatment.In chapterⅢ, systemetically investigated the degradation of Methyl tert-Butyl Ether (MTBE) in water by GDP under various reaction conditions, such as, initial MTBE concentration ,the initial solution pH, current intensity and iron salts and comparing energy efficiency of GDP with those of photocatalytic degradation and high density plasma. The results indicated that glow discharge plasma leads to high degradation rate of MTBE without catalyst, the experimental results of mineralization of the MTBE (TOC) also proved that. Enhancing the applied currents and lowering the solution pH were found to be favorable for MTBE degradation; Carbonate ions in the solution can decelerate the MTBE removal. With the increase of the initial concentration, the energy efficiency of GDP increased. With the initial concentration 200mg/L the energy efficiency is 3.00×10-9mol/J and the energy efficiencies for MTBE degradation in GDP are far higher than that in photocatalytic degradation.In chapterⅣ, the glow discharge current obvious influenced the formation of hydrogen peroxide and hydroxyl radical during MTBE degradation. With the increase of the discharge current, the formation of hydrogen peroxide and hydroxyl radical increased. For example, when the current was 100mA, 0.7mM/L of hydrogen peroxide and 8.12μM/L of hydroxyl radical produced in 30 min. And when the current increased to 200mA, 2.1mM/L of hydrogen peroxide and 9.1μM/L of hydroxyl radical produced within 30 min. Experimental results indicated that adding ferrous ion and ferric ion to the solution, the catalytic action of ferrous ion and ferric ion was obvious. Intermediates detected by GC-MS and ion chromatography (IC) included acetic acid ,formic acid ,tert-butyl alcohol and acetone etc. The final product is water and carbon dioxide. On the basis of the degradation products, potential degradation process of MTBE degradation by Glow Discharge Plasma is proposed.In chapterⅤ, this paper using glow discharge plasma treatment of chitosan for the first time, and conducted the adsorption of AR73 wastewater study. The results showed that, modification of chitosan by hydrogen peroxide and reactive oxygen species such as active ion produced by the glow discharge plasma device has been greatly improved in AR73 adsorption. The findings woud provide an alternative to the treatment of AR wastewater.