Heterogeneous Photocatalytic Degradation of Dyes in Water/Alcohol Solution Used by the Brazilian Agate Industry
Geomaterials(2019)
摘要
The agate dyeing industry has been commonly seen as a high-pollution industry.Dyeing wastewater treatment is considered one of the most important categories for water-pollution control, because of its intense colour and the high concentration of organic contaminants.Most dyes used in the process present minimal biodegradability due to aromatic organic compounds in their structure.Using a photocatalytic reactor, experiments were carried out to study the decolorization of a water solution containing 8% ethylic alcohol and 200 mg L -1 of the dye Rhodamine B (RhB), the most difficult colorant to degrade among the used by the agate industry.The best conditions were further applied to treat the same agate water/ethyl alcohol solution containing a mixture of 200 mg L -1 of Rhodamine B (RhB), Crystal Violet (CV), Brilliant Green (BG), and Blood Red (BR).All the experiments were performed in a 2 L reactor equipped with ultraviolet (UV) lamps, at a wavelength of 365 nm, with powdered TiO 2 or ZnO as the catalyst.The results indicated that the optimal decolorization conditions were attained with 2.5 g L -1 of the catalyst at pH 10 and an irradiation time of 80 min.The process resulted in complete degradation of CV, BG and 80% -90% degradation of RhB and BR.The catalyst ZnO presented a performance somewhat better than TiO 2 .It is possible to conclude that the process of heterogeneous photocatalysis is effective for decolorization of water streams from the agate industry.
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关键词
Photocatalysis
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