Font Size: a A A

Degradation Of Organic Wastewater By Microwave-induced Catalytic Oxidation

Posted on:2013-04-15Degree:MasterType:Thesis
Country:ChinaCandidate:Q Z LuFull Text:PDF
GTID:2231330395480468Subject:Industrial Catalysis
Abstract/Summary:PDF Full Text Request
Aim to problems of nonbiodegradable wastewater treatment, in thispaper, a novel process, named microwave induced catalytic oxidationprocess is founded. Compared with other advanced oxidation processes,microwave induced catalytic oxidation process has many advantages suchas the oxidation speed and the mineralization efficiency are higher, theset-up is simpler, and the operation conditions are more convenient. So itpromises to have a wide application in the wastewater treatment. Thepreparing of heterogeneous catalysts with high activity and stability isone of key techniques in microwave induced catalytic oxidation process.In this paper, CuO/γ-Al2O3catalyst, CuO/CeO2catalyst and Pt/717#anionexchange resin were prepared. The catalytic activity of catalysts was investigated in microwave induced H2O2catalytic oxidation process byusing methyl orange as a model pollutant.Firstly, CuO/γ-Al2O3was prepared by impregnation method. Thecatalytic activity and stability were investigated in microwave inducedH2O2catalytic oxidation process. XRD and experimental results indicatedthat basic copper nitrate exhibited higher activity than copper oxide.Under the optimal treatment conditions of methyl orange concentration of50mg/L, microwave power of700W, irradiation time of7min, catalystmass of0.3g and H2O2volume of2mL, a methyl orange removal rate of98.7%is obtained. The catalyst can be reused5times remaining a methylorange removal rate of more than98%.The process of microwave induced H2O2catalytic oxidation treatingmethyl orange wastewater was investigated by adding CuO/CeO2as acatalyst. X-ray Diffraction (XRD), FT-IR, BET and TRP/TPD were usedto analysis of the structure and physico-chemical properties. The testresults show that, the catalyst prepared at300℃had the highestdegradation ability on methyl orange. Under a given condition (microwave power385W, contact time5min, catalyst dosage0.05g,H2O2dosage0.6mL), methyl orange removal percentage approached96.6%.The Pt-based catalyst was prepared by ion exchange method usingstrongly basic exchange resin as a carrier. The catalyst was applied in themicrowave induced catalytic oxidation process for degradation of methylorange. Under the optimal treatment conditions of methyl orangeconcentration of50mg/L, microwave power of700W, irradiation time of5min, catalyst mass of0.1g and H2O2volume of0.5mL, a methylorange removal rate of96.4%is obtained. The result of orthogonalexperiment shows that, the influence factors sequence of methyl orangeremoval is catalyst dosage> irradiation time> microwave power> H2O2volume. Variance analysis shows that, catalyst dosage and irradiationtime are significant influence on the evaluation index. The catalyst can bereused5times remaining a methyl orange removal rate of more than85%The H2O2oxidation has been realized by combining microwave technology and CuO/γ-Al2O3, CuO/CeO2or Pt/717#anion exchange resincatalytic oxidation. Compared with traditional oxidation, microwaveinduced H2O2catalytic oxidation process can degrade contaminants inshort time and with low oxidation dosage. As a developing process, themicrowave induced H2O2catalytic oxidation process would provide anovel treatment method for the refractory wastewater and would have abroad prospect.
Keywords/Search Tags:microwave, catalytic oxidation, hydrogen peroxide, methyl orange, wastewater
PDF Full Text Request
Related items