The effectiveness of peroxymonocarbonate ( HCO 4 − ) on the degradation of Reactive Blue 19 (RB19) textile dye was investigated in this study. The formation kinetics of HCO 4 − produced in situ in a H 2 O 2 − HCO 3 − system was studied to control the experimental conditions for the investigation of RB19 degradation at mild conditions. The effects of metallic ion catalysts, the pH, the input HCO 3 − and Co2+ concentrations, and UV irradiation were studied. The obtained result showed that Co2+ ion gave the highest efficiency on accelerating the rate of RB19 degradation by the H2O2– HCO 3 − system. In the pH range of 7–10, the higher pH values resulted in faster dye degradation. The reaction orders of the RB19 degradation with respect to Co2+ and HCO3– were determined to be 1.2 and 1.7, respectively. The UV irradiation remarkably enhanced the radical formation in the oxidation system, which led to high degradation efficiencies. The COD, TOC removal, and HPLC results clearly revealed complete mineralization of RB19 by the H 2 O 2 − HCO 3 − − Co 2 + system.

Well-defined random and block-random diblock terpolymers consisting of methyl methacrylate (MMA), butyl acrylate (BA) and tertbutyldimethylsilyl methacrylate (t-BDMSMA) were successfully synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization using 2-cyanoprop-2-yl-dithiobenzoate (CPDB) as RAFT agent.1 H NMR and GPC analyses indicated the formation of random terpolymers [P(MMA-co-BA-co-t-BDMSMA)] and block-random diblock terpolymers [(PMMA-b-P(BA-co-t-BDMSMA) and Pt-BDMSMA-b-P(BA-co-MMA)] with good control of terpolymer composition, molecular weights and molecular weight distributions (Ð < 1.20). Thermal analysis results showed that the random terpolymers exhibited only one glass transition temperature (Tg) which depends on the terpolymer composition. The (PMMA-b-P(BA-co-t-BDMSMA) block-random diblock terpolymer showed two Tg that can be attributed to two blocks of terpolymer. Meanwhile, Pt-BDMSMA-b-P(BA-co-MMA) block-random diblock terpolymer exhibited only one Tg value, which is probably due to a low proportion of Pt-BDMSMA block present in the terpolymer.

In this study, the COD and TOC in H2O2-HCO3– oxidation system containing potassium hydrogen phthalate were determined by UV spectrophotometry (260-310 nm). The pH and H2O2 concentrations were investigated as factors influencing the absorbance measurements. The obtained standard curves were Abs = (3.10±0.04)x103xCOD - (0.015±0.003) (R2=0.9996) with LOD of 5.1 mg O2/l and LOQ of 13.6 mg O2/l, and Abs = (0.008±0.0001)xTOC - (0.015±0.003) (R2=0.9996) with LOD of 1.6 mg/l and LOQ of 5.4 mg/l. The method was applied to monitor the degradation of potassium hydrogen phthalate by the H2O2-HCO3– oxidation system. The results revealed that the COD and TOC removal efficiencies reached ~85% after 90 minutes of UVC irradiation. The UV spectra and HPLC chromatographs showed that no aromatic compounds were obtained in the degradation products.