Study On The Degradation Process Of Dye Cationic Red X-GRL Treated By Two Methods

Three aspects of cationic red X-GRL were been researched by aluminum-carbonmicro-electrolysis and photocatalysis oxidation:(1) The properties and conditions ofdegradation by aluminum-carbon micro-electrolysis were intensively studied.(2) Theproperties and conditions of degradation by photocatalysis oxidation were also deeplyresearched.(3) The intermediate products and final products of the two waysmentioned above were investigated by many analytical tools, and then the degradationprocess and rule were concluded.The following research findings were obtained via experimental research andanalysis.(1) The decoloration of alkaline dye-wastewater is effective by the use ofaluminum-carbon micro-electrolysis, and the optimal conditions are: the initial pH is12, active carbon dosage8g, aluminum/carbon ratio0.8:1and reaction time120min.Under the best conditions chroma removing rate and that of COD reach to95.3%and75.8%, respectively.(2) The photocatalysis oxidation of alkaline dye-wastewater is effective, and theoptimum conditions are: In terms of0.1g/L cationic red X-GRL, the initial pH is10,potassium peroxodisulfate dosage3.3mmol/L and reaction time80min. Under the bestconditions chroma removing rate and that of COD reach to96%and90%,respectively.(3) Many analytical tools such as ultraviolet-visible spectrophotometer(UV),infrared spectroscopy(IR) and gas chromatography mass spectrometry were used tostudy the intermediate products and final products produced by aluminum-carbonmicro-electrolysis and photocatalysis oxidation, and then the degradation process andrule were inferred.(4) Azo group of cationic red X-GRL is destroyed and thus is decolored byaluminum-carbon micro-electrolysis, but the benzene ring structure is integrated. Incontrast, sulfate radical from potassium peroxodisulfate in the presence of ultravioletlight is of so strong oxidizing that the benzene ring was completely degraded.