Trace Cu(Ⅱ) can enhance the degradation of Orange Ⅱ in Fe(Ⅱ)/hydroxylamine/persulfate system

Sulfite activation by oxidized pyrite for dye degradation assisted by oxygen

“…It was observed that the TOC removal efficiencies of RB, MO, NR, MB, and OII were 33.16%, 37.33%, 28.82%, 38.27%, and 32.74% respectively, after 20 min reaction. Although the results of this experiment were better than those of some similar reported degradation systems, 9,32,33 the low TOC removal efficiencies (o 40%) of different dye pollutants indicated that the mineralization rate of the OP/SS system should be increased in further research.…”

“…According to previous studies, EtOH and TBA were commonly used as scavengers of OH and SO 4 À , and OH, respectively. 14,32 The molar ratio of alcohol to sulfite was set to 500 : 1, namely the concentration of EtOH and TBA was calculated to be 1.0 M according to our previous research. 8 As presented in Fig.…”

UV-enhanced nano-nickel ferrite-activated peroxymonosulfate for the degradation of chlortetracycline hydrochloride in aqueous solution

“…The methyl group in the dimethylamino moiety was eliminated, which might be due to direct UV photolysis 59 or OH˙ and SO 4 − ˙ induced hydrogen atom extraction from the methyl substituent. 60 The hydroxylation of transformation pathway 2 is a common reaction route in the SO 4 − ˙ reaction mechanism that produces product B ( m / z = 494). SO 4 − ˙ has a similar reaction mechanism to HO˙, namely, (i) hydrogen abstraction; (ii) addition of hydroxyl groups to unsaturated carbons including double bonds and aromatic rings; and (iii) electron transfer.…”

“… 61,62 The unsaturated double bond of CTH was attacked to form a hydroxylate species. The C6 and C8 sites were prone to undergo dehydration reactions; 60 hence, dehydration occurred and produced product C ( m / z = 460) in transformation pathway 3. Eventually, CTH was degraded into structurally simple products [product G ( m / z = 112), product H ( m / z = 86), and product I ( m / z = 92)] and was ultimately mineralized into CO 2 and H 2 O.…”