The Research On Photocatalytically Degrading Organic Matter In Dyestuff Wastewater By Using Catalyst Cobalt Sulfonated Phthalocyanine(CoPcS)

Treating dyeing wastewater is very difficult, because of its complex component, high chroma and concentration, strong toxicity, unstable water quality and difficult for degradation. As to organic wastewater treatment, during twenty century and seventy ages, foreign scientists did a lots of research, including flocculation deposition,chemical oxidation,anaerobic and aerobic treatment process, there is also some research and application domestic. However, degradation of chroma and organic matter only by using physics,chemical and bio-chemical has its limits.Using lamp-house as driving force to active catalyst during photocatalytically degrading has the benefit to accelerate the redox and has become a satisfactory environmental pollution treatment technique, the method has a great future because of high efficiency, energy saving and no secondary pollution benefit.By using phthalic anhydride- carbamide method to prepare cobalt sulfonated phthalocyanine (CoPcS), characterizations the product by using FI-TR,VU-vis. The degradation of three different type of dyes(rhodamine B,methylene blue and methyl orange) was discussed by using self-made homogeneous catalyst CoPcS. Multiphase catalyst (attapulgite supported CoPcS) was also applied to study the degradation of rhodamine B, the degradation result was compared with rhodamine B degradation mentioned above.The thesis had conducted the research from the following aspects:The degradation effect of three representative dyes was discussed in this thesis by using CoPcS as catalyst:1,the degradation of rhodamine B: when the catalyst concentration was 0.6g/L, light intensity was 250W, rhodamine B concentration was 8mg/L, the degradation of rhodamine B came to 91.40% within 30min. the optimal degradation condition was found out by the orthogonal: the pH value was l;the temperature was 40℃; the intensity of UV light was 250W;the best catalyst concentration was 0.4g/L.By the orthogonal test and its square difference ananysis, the sequence of significant effect factor followed: UV light intensity>pH value> catalyst concentration>temperature. and photocatalytic degradation of rhodamine B kept well with the first order kinetic equation.2,the degradation of methylene blue by using catalyst and H₂O₂: when the catalyst concentration was 0.2g/L, light intensity was 250W, methylene blue concentration was 8mg/L,the degradation of methylene blue is completely within 40min. the optimal degradation condition was found out by the orthogonal: temperature was 50℃;UV light intensity was 250W, H₂O₂ volume was 1ml. By the orthogonal test and its square difference analysis, the sequence of significant effect factor was: UV light intensity) temperature) time) H₂O₂ volume, and photocatalytic degradation of methylene blue kept well with the first order kinetic equation.3,the degradation of methyl orange: when the catalyst concentration was 0.2g/L, light intensity was 250W, pH value was 1, methyl orange concentration was 10mg/L, the degradation of methylene blue came to 98.06% within 40min. the optical degradation condation: pH value was l;catalyst concentration was 0.2g/L, initial concentration of methyl orange was 15mg/L;temperature was 40℃.By the orthogonal test and its square difference ananysis, the sequence of significant effect factor was: pH value> initial concentration of methyl orange) temperature) catalyst concentration. The reaction was in accordance with zero-order kinetics equation.The degradation effect of rhodam rhodamine B was discussed by using multiphase catalyst: attapulgite which was burning at 420℃had a stronger absorption of rhodamine B than the burning at other temprature, the supported catalyst still had a strong degradation capability by using three times, the degradation capacity of multiphase catalyst was weaker than homogeneous catalyst, the best dosage was 4g/L.The study indicates CoPcS has favorable photosensitivity and it is a useful photosensitizer, Treating dyeing wastewater by using CoPcS as catalyst comes to good results.