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This personalized URL provides 50 days' free access to this article. Apparently, the Cu-CD, which surface is covered by a soft and highly hydrated caramelized PEG coating accelerates the ozone decomposition and dye adsorption increasing its degradation. Taking into consideration that the real textile effluent under research has a high carbonates concentration (>356 mg/L), which inhibits ozone decomposition, the discoloration first-order rate constants, without and with Cu-CD, kap = 0.0097 min-1 and kapc = 0.012 min-1 (%Inc = 24%), were relatively small. The presence of sodium chloride (at a concentration of 50 g/L) marked increased the discoloration rate of the dye solution due to generation of other radicals, like for example the chlorine and chlorine oxide, resulting from the reaction of ozone and chloride. In the presence of Cu-CD, the following apparent first order rate constants were obtained (kapc in min-1) with the corresponding increase in the rate constant without catalyst (%Inc): MO, 1.184 (464%) O-II, 1.002 (653%) RB-5, 0.709(301%) RBB-R, 0.230 (167%). The discoloration of the aqueous dye solutions followed an apparent first order kinetics with the following rate constants (kap in min-1): MO, 0.210 O-II, 0.133 RB-5, 0.177 RBB-R, 0.086. The Cu-CD, with marked catalytic ozonation properties, were successfully synthesized by one-pot hydrothermal procedure and have a size of 4.0 nm, a charge of -3.7 mV and a fluorescent quantum yield of 31%. Four dyes were analyzed, Methyl Orange (MO), Orange II sodium salt (O-II), Reactive Black 5 (RB-5) and Remazol Brilliant Blue R (RBB-R), besides a real effluent from dying and printing industry. A catalytic ozonation advanced oxidation process (AOP) having as catalyst a copper(II) doped carbon dot, Cu-CD (using L-cysteine and polyethylene glycol (PEG) as precursors and passivation agents), was developed for textile wastewater treatment (T=25 ✬ and pH=7).