期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 23, 期 18, 页码 18564-18574出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-016-7015-4
关键词
Activated carbon fiber; Persulfate; Azo dye; Activation
资金
- National Natural Science Foundation of China [51478283, 51509175]
Activated carbon fiber (ACF) was used as a green catalyst to activate persulfate (PS) for oxidative decolorization of azo dye. ACF demonstrated a higher activity than activated carbon (AC) to activate PS to decolorize Orange G (OG). The decolorization efficiency of OG increased as ACF loading, PS dosage, and temperature increased. OG decolorization followed a pseudo first-order kinetics, and the activation energy was 40.902 kJ/mol. pH had no apparent effect on OG decolorization. Radical quenching experiments with various radical scavengers (e.g., alcohols, phenol) showed that radical-induced decolorization of OG took place on the surface of ACF, and both SO4 center dot- and HO center dot were responsible for OG decolorization. The impact of inorganic salts was also evaluated because they are important compositions of dye wastewater. Cl- and SO42- exhibited a promoting effect on OG decolorization, and the accelerating rate increased with elevating dosage of ions. Addition of Cl- and SO42- could increase the adsorption of OG on ACF surface, thus favorable for OG decolorization caused by the surface-bound SO4 center dot- and HO center dot. Conversely, HCO3- and humic acid (HA) slightly inhibited OG decolorization. The azo band and naphthalene ring on OG were remarkably destructed to other intermediates and finally mineralized to CO2 and H2O.
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