In this work, a plasma-solution system was applied to the degradation of Acid Orange 7 （AO？）. The effects of initial concentration and type of feed gases （air, oxygen, nitrogen or argon） were studied. As the init...In this work, a plasma-solution system was applied to the degradation of Acid Orange 7 （AO？）. The effects of initial concentration and type of feed gases （air, oxygen, nitrogen or argon） were studied. As the initial concentration increased from 100 mg/L to 160 mg/L, the discolouration rate of AO7 decreased from 99.3% to 95.9%, whereas the COD removal rate decreased from 37.9% to 22.6%. Air provided the best discolouration and COD removal rates （99.3% and 3？.9%, respectively）. In the presence of a zero-valent iron （ZVI） catalyst, the AO？ COD removal rate increased to 76.4%. The degradation products were analysed by a GC-MS, revealing that the degradation of the dye molecule was initiated through the cleavage of the -N=N- bond before finally being converted to organic acids.展开更多
Synthetic porphyrins have, in the last years, gained increasing interest in analytical chemistry as unique reagents for the detection of metal ions. The porphyrin is a high sensitive chromogenic reagent. Porphyrins an...Synthetic porphyrins have, in the last years, gained increasing interest in analytical chemistry as unique reagents for the detection of metal ions. The porphyrin is a high sensitive chromogenic reagent. Porphyrins and their metal complexes generally exhibit characteristic sharp and intensive absorption bands in visible region. The region from 400 to 500 nm, which is called the Soret band, shows the most intensive absorption, and molar absorptivities about 105 are often found. Soret band (400-500 nm) shows the most intensive absorption of these compounds, molar absorptivities often being about 105. The Soret band is widely used for spectro- photometric detection of metalloporphyrins. From the perspective of analytical chemistry, the porphyrin ligand has turned out to be very versatile, and almost all metals have been combined with porphyrin. From this point of view several porphyrins become useful as the spectrophotometric reagents for the determination of metal ions.展开更多
基金supported by National Natural Science Foundation of China(Nos.50908237,51076142)the Open Foundation of the State Key Laboratory of Clean Energy Utilization of China(No.ZJUCEU2009008)
文摘In this work, a plasma-solution system was applied to the degradation of Acid Orange 7 （AO？）. The effects of initial concentration and type of feed gases （air, oxygen, nitrogen or argon） were studied. As the initial concentration increased from 100 mg/L to 160 mg/L, the discolouration rate of AO7 decreased from 99.3% to 95.9%, whereas the COD removal rate decreased from 37.9% to 22.6%. Air provided the best discolouration and COD removal rates （99.3% and 3？.9%, respectively）. In the presence of a zero-valent iron （ZVI） catalyst, the AO？ COD removal rate increased to 76.4%. The degradation products were analysed by a GC-MS, revealing that the degradation of the dye molecule was initiated through the cleavage of the -N=N- bond before finally being converted to organic acids.
文摘Synthetic porphyrins have, in the last years, gained increasing interest in analytical chemistry as unique reagents for the detection of metal ions. The porphyrin is a high sensitive chromogenic reagent. Porphyrins and their metal complexes generally exhibit characteristic sharp and intensive absorption bands in visible region. The region from 400 to 500 nm, which is called the Soret band, shows the most intensive absorption, and molar absorptivities about 105 are often found. Soret band (400-500 nm) shows the most intensive absorption of these compounds, molar absorptivities often being about 105. The Soret band is widely used for spectro- photometric detection of metalloporphyrins. From the perspective of analytical chemistry, the porphyrin ligand has turned out to be very versatile, and almost all metals have been combined with porphyrin. From this point of view several porphyrins become useful as the spectrophotometric reagents for the determination of metal ions.
