Degradation of acid red 73 wastewater by hydrodynamic cavitation combined with ozone and its mechanism

Sequential electron beam and bioflocculation for treatment of textile nanodyes

“…The results show that for treatments involving electron beam irradiation, the presence of peaks at 3543 and 3398 cm −1 indicated hydroxylation of the nanodye, the peak at 1523.7 cm −1 disappeared which reflects breaking the –N N– bond, the disappearance of peaks at 1211.25 and 997 cm −1 indicated removal of R-SO 3 − . 40 On the other hand, the appearance of peak at 1614 cm −1 represents carbonyl band and the appearance of a secondary amine peak at 625 cm −1 . 50 Examining the FTIR for the bioflocculation treated nanodye, the spectrum resembles that for the electron beam exposed samples, but without the appearance of the peaks that indicate hydroxylation.…”

“…1c) for the nano dye under study showed peaks at 3024.6 cm −1 and 2929.7 for ]C-H (aromatic ring) and -OH stretching (carboxylic acid), respectively, 28 839.1 cm −1 for -CH 2symmetrical stretching, 1523.7 cm −1 for -N]Nstretching vibration, 1425 and 1342.4 cm −1 for aromatic -C]Cstretching and -C-Naromatic stretching vibration, 1211.25 and 997 were for R-SO 3 − asymmetric stretching vibration. 40 The elemental analysis shows that the dye contains C, N, O and S along with Na and Cl (Fig. 2 and Table 2) which conrms that this dye is an azo dye that contains carboxylic and sulfate groups and its present in its sodium salt form.…”

“…39 Peak at around 510 nm is characteristic of azo bond. 40 Dynamic light scattering test of the dye showed that its size was 240 nm which conrms that it is of nano size. 41 The surface charge of −28.58 mV and the pH of the dye is water soluble (Table 1), and its aqueous solution was pH 5 which indicates that this is an anionic dye.…”

Effect of Plasma Activated Water on the Degradation of Bifenazate and Spirodiclofen Residues on Cuimi kumquat and Impact on Its Quality

“…In this experiment, PAW mainly degraded pesticides through underwater discharge of APPJ to generate ROS. Multiple studies have shown that O 3 in ROS plays a key role in pesticide degradation [25][26][27][28]. OH• and H 2 O 2 generated using O 3 in aqueous solution also have a certain effect on pesticide degradation [29].…”