Abstract:The degradation of direct fast black G (DB19) with ferrate solution (FS) was studied, and the mechanism was analyzed by UV-Vis and GC/MS methods. The decolorization ratio was above 94% after 5min in the presence of FS at pH<7.7, and the optimal range of pH was lower than 10.7. The decolorization ratio and COD removal ratio were 95% and 60% after 60min, respectively, in the case of FS which dosage was 20mg/L. TOC removal ratio of DB19 was only 5% when ferrate was supplied to reaction system, which indicated that it was difficult for FS to mineralize dye macromolecule. The results of UV-Vis, GC/MS and pH change showed that the azo bonds of dye molecule were attracted and cleaved, causing decolorization of DB19. The dye macromolecule could be oxidized to small molecule, which increased the biodegradability of the dye wastewater. Furthermore, a large number of acidic organic intermediates were detected, which obviously caused the decrease of pH.
张彦平, 许国仁. 高铁酸盐溶液氧化直接耐晒黑G的效果及机理[J]. 中国环境科学, 2009, 29(11): 1177-1180.
ZHANG Yan-Ping, XU Guo-Ren. Degradation and mechanism of direct fast black G with ferrate solution. . CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(11): 1177-1180.