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Many Chinese small electroplating enterprises usually discharge mixed electroplating wastewater which contains CN-, Cr(VI), Cu2+, Zn2+ and other toxic heavy metals. It is hard for efficiently treating this mixed wastewate. At present, conventional chemical methods could usually meet discharge standard, but may not meet recycling need. In this paper, a combined treatment process include O3 oxidation,...
Photo-Fenton reaction is a kind of advanced oxidation technology based on the reaction of hydroxyl radical. In order to further enhance the photocatalytic efficiency, with citric acid as the catalytic additive, and malachite green as the substrate, experiments on the photocatalytic oxidation of organic pollutants in UV/Fenton/Citric acid system were carried out. Effect of Fe(II) concentration, initial...
In a phosphate buffer medium of pH 7.0, free iodine liberated through the oxidation of I- by IO3-, reacts with excess I- to form a binary complex of I3-, which reacts further with CTMAB to form a ternary ion association complex of CTMA+ldrI3-. This ternary complex is easily soluble and kept stable in organic solvents, in which it has absorption maximum at 365 nm. In the presence trace amounts of...
The photodegradation of acetic acid was carried out in the presence of UV/H2O2. The degradation rate was strongly influenced by pH, the intensity of light and initial concentration of acetic acid and H2O2. The effect of anions HCO3-, Cl-, NO3-, SO42- and cations Fe2+, Cu2+, Mn2+ in aqueous solution was also studied . An initial acetic acid concentration of 8 mmol/L was almost completely degraded...
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