Degradation of remazol golden yellow dye wastewater in microwave enhanced ClO2 catalytic oxidation process

Catalytic oxidation and spectroscopic analysis of simulated wastewater containing o-chlorophenol by using chlorine dioxide as oxidant

“…In fact, chlorine dioxide is an effective oxidant. However, there are few reports on the use of chlorine dioxide in the catalytic oxidization processes [9][10][11][12][13].…”

A study on rapid acid chrome black (MB 7) spectrophotometric determination of ClO2 and catalytic degradation of 2,6-dinitro-p-cresol (DNPC) by ClO2

“…Subsequently, certain amounts of the stock ClO 2 solution were introduced into the reactor with continuous stirring, and it was treated as the starting point (t = 0) of the reaction. For analysis, samples were withdrawn from the reaction system at certain time intervals, and sodium thiosulfate was added to the samples immediately to dechlorinate ClO 2 residuals [19]. The samples were then filtered, and the filtrate was centrifuged at 6,000 rpm for 5 min before analysis.…”

“…The efficiency of the ClO 2 catalytic oxidation reaction relies on the suitable catalysts used in the process. A heterogeneous CuO n -La 2 O 3 /γ-Al 2 O 3 catalyst that was prepared by impregnation-deposition method for ClO 2 oxidation process assisted by microwave has been used in the degradation of phenol and remazol golden yellow dye [18,19]. The ClO 2 catalytic oxidation process could effectively degrade pollutants in wastewater in shorter reaction time, with lower oxidant dosage and in a more extensive pH range compared with no catalyst process.…”

Study on the treatment of 2-sec-butyl-4,6-dinitrophenol (DNBP) wastewater by ClO2 in the presence of aluminum oxide as catalyst

“…With strong oxidizing properties, ClO 2 itself can oxidize a range of organic pollutants with resulting production of oxidation by-products. It has been also proposed that the catalyst surface oxygenous group can initiate the ClO 2 to be changed into free radicals, such as • OH, and subsequent oxidation of adsorbed DNBP via free radical pathways [18,27]. To verify the above mentioned theory, 0.5 mL of tertiary butyl alcohol which served as • OH-scavenger [28] was added to ClO 2 catalytic oxidation system under the optimal experimental conditions (39 mg L −1 DNBP concentration, pH 4.66, 10.7 g L −1 and 0.355 g L −1 of Al 2 O 3 catalyst and ClO 2 , respectively).…”

“…A CuO n -La 2 O 3 /␥-Al 2 O 3 catalyst which was prepared by impregnation-deposition method was used in the ClO 2 oxidation process assisted by microwave. It could effectively degrade phenol and remazol golden yellow dye in wastewater in short reaction time and with low oxidant dosage, extensive pH range compared with no catalyst process [17,18]. However, the catalyst used in the ClO 2 catalytic oxidation process was not economical because of the adding of noble metal.…”