Abstract
The effects of pH value, VUV intensity, initial dye concentration, initial H2O2concentration, and TiO2loading dose on the degradation of three azo dyes: acid Orange 8, acid Blue 29, and acid Blue 113 were studied to explore and compare the treatment efficiencies among the adopted AOPs. It was found that pH played an important role in the degradation of dyes using VUV irradiation. For VUV/H2O2, VUV/TiO2, and VUV/TiO2/H2O2processes, the decoloration rates of the three azo dyes were more efficient under acidic conditions relative to alkaline conditions. The degradation rates of dyes increased with increasing concentrations of H2O2, but reaction rates were retarded at high concentrations of H2O2because the H2O2compound acted as a scavenger of the hydroxyl radical. In this paper, three azo dyes were decomposed efficiently by VUV irradiation only demonstrating the effectiveness of VUV direct photolysis.
Highlights
Environmental protection has been a globally important issue for the past few decades
The vacuum-UV photolysis of water (H2O-VUV) is still a field of active research compared to other advanced oxidation processes (AOPs) [12]
The aim of this paper is to investigate reaction behaviors associated with the decomposition of dyecontaining wastewaters by VUV-based advanced oxidation processes (AOPs)
Summary
Environmental protection has been a globally important issue for the past few decades. Environmental data show that industrial wastewater mainly consists of heavy metals, volatile organic compounds (VOCs), cyanide, COD, oil, suspended solids, and sulfides. Treatment of colored wastewaters produced by textile and other industries is a serious problem that has attracted the attention of many researchers during last few decades. Treatment methods of wastewater containing dyes can be divided into two main groups: (1) chemical or physical dye removal methods, which refer to the process called decoloration and (2) dye removal by means of biodegradation. Physical methods of decoloration include different precipitation methods (coagulation, flocculation, and sedimentation), adsorption (on activated carbon, biological sludge, and silica gel), filtration, reverse, and osmosis. Chemical processes involved in chemical dye removal methods include reduction, oxidation, complexometric methods, ion exchange, and neutralization.
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