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Fly acid activation and Fenton- oxidation properties of PNP

Author: WangZuoZuo
Tutor: ZhangAiLi
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Fly Acid activation Nitrophenol (PNP) Class Fenion catalytic Peroxide
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 126
Quote: 0
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Abstract


Fly ash is a coal-fired power plant emissions from solid waste . Although serious harm , but because of fly ash having a porous structure , the larger the specific surface area and containing the active metal oxides have a catalytic ability . P-nitrophenol (PNP) are toxic biodegradable organics, and was recognized as a priority EPA contaminants. Class -Fenton oxidation technology in recent years developed a new technique based on Fenton oxidation technology that can more effectively in the oxidative decomposition of biodegradable organic wastewater contaminants. In this paper, coal-fired power plant fly ash as a raw material, PNP target contaminants studied acid activation of fly ash (AFA) Modification and class -Fenton degradation of PNP performance. First select the activation of fly ash has the best performance of inorganic acids and examined the raw ash (RFA) and activation ash (AFA) of the surface morphology and physical and chemical properties ; AFA next examined the catalytic performance factors ; Finally, studies of fly ash produced H2O2 catalyzed oxidation PNP -OH on the basis of the dynamic process of catalytic oxidation by H2O2 AFA explored the mechanism of organic matter . The results showed that the activation of nitric acid on the ash has the best results. Under optimum conditions, ie, when the solution pH = 2, H2O2 concentration was 166.5 mg · L-1, fly ash dosage of 10 g · L-1, the reaction time was 60 min, , PNP removal rate 98%; reaction process , AFA and the adsorption amount of the PNP to the solution of the dissolved Fe element catalysis induced phase contribute little to the removal of the PNP , respectively, of PNP removal rate of only 2.96 % 2.79% ; the AFA catalytic process , increasing the dosage of AFA , reduce response time, you can enhance the stability of the catalyst ; PNP degradation kinetics showed an initial slow and fast next two stages , AFA catalytic reaction mechanism similar to Fe3 phase catalytic reaction mechanism .

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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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