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Study on Photodegraduation of Methyl Orange by TiO2/Fe（Ⅲ） Assisted with Citric Acid/Tartaric Acid

Author: DuYanYan
Tutor: LanYeQing
School: Nanjing Agricultural College
Course: Applied Chemistry
Keywords: Methyl orange Citric acid Tartaric acid Photocatalytic Degradation TiO2 Fe (III)
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 54
Quote: 0
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Abstract


Azo dyes are widely used in industrial products such as textiles, food and leather products. Lot of azo dyes with the industrial wastewater discharged into the environment, and become more and more serious environmental problems because of its complex structure, poor biodegradability, traditional physical and chemical methods biodegradable. Therefore, seek effective method of dealing with such high toxic refractory wastewater has important theoretical and practical significance. Photocatalytic oxidation technology can effectively destroy many of the structural stability of biological biodegradable organic pollutants, and has the advantages of efficient, harmless and attracted widespread attention. This paper studies the citric / tartaric acid collaborative TiO2/Fe (Ⅲ) Photocatalytic Degradation of MO kinetic mechanism and influencing factors. This thesis is divided into two parts: the first part: 25 ° C and pH 2.0-8.0 conditions, batch test of citric acid and tartaric acid collaborative mechanism of TiO2 photocatalytic degradation of methyl orange and its influencing factors. The results showed that the UV irradiation, tartaric acid, and citric acid degradation of methyl orange on TiO2 significant synergies and organic acids synergistic degradation of methyl orange reaction was zero-order reaction rate equation. The acidic conditions are conducive to degradation of methyl orange, a pH = 4 TiO2-citrate system degradation rate constants of TiO2 alone 3 times, while the the TiO2-tartaric system degradation rate constants for separate TiO2 5 times. Initial concentration change of methyl orange, two kinds of-organic acids collaborative TiO2 rate constant degradation of methyl orange is essentially the same, was zero-order reaction law, namely 30mg · L-1 TiO2 1mmol · L-1 of organic acids, A degradation of the base orange only with the the TiO2 surface active sites, independent of concentration. Degradation of methyl orange light wavelength ultraviolet energy high favor organic acids collaborative TiO2 degradation of methyl orange, and visible light energy weak little degradation of methyl orange. The second part: 25 ° C and pH 2.0-8.0 under conditions studied Fe (Ⅲ) - citric acid and Fe (III) - tartrate two photocatalytic degradation of methyl orange. The results show that Fe (Ⅲ) or organic acids alone, methyl orange decolorization very slow. However, Fe (Ⅲ) co-exist with organic acids, UV irradiation under the reaction of methyl orange decolorization rate has been significantly improved. Methyl orange decolorization reaction kinetics in the two systems obey the quasi-zero-order law, divided equally in two stages. The initial stage of the reaction, the decolorization rate is slow, and the the later reaction rate significantly accelerated. Monitoring of the reaction intermediate concentration of Fe (Ⅱ), Fe (Ⅱ) generates a concentration that a rapid increase in the stage and stabilized stage can be divided into two phases, a turning point in time of the turning point with methyl orange rate changes on corresponding This indicates that the maximum decolorization rate stabilized Fe (Ⅱ) amount. Two reaction system differences in the influence of pH on the decolorization of methyl orange methyl orange decolorization rate of Fe (III) - citric acid system pH6 gt; pH4 gt; pH 8 gt; pH2 while Fe (Ⅲ) - tartaric acid decolorization rate of methyl orange pH 8 gt; pH4 gt; to pH6 gt; pH2 such differences two reasons with different pH system the complexes exist morphology.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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