Bismuth Tungstate Photocatalytic Degradation of Tetracycline Wastewater
China is a major producer of antibiotics and one of the most serious countries that abuse antibiotics.
Livestock farming is the hardest hit by the use of antibiotics, with the rapid development of aquaculture, the residues of antibiotics in water, sediment and soil become more and more serious.
Tetracycline is the most common antibiotic used in livestock farming. Its main characteristics are broad-spectrum antibacterial and cheap, unlike other organic wastewater contamination, tetracycline and other antibiotic compounds usually have a shorter degradation half-life in the environment, however, the use of tetracyclines in livestock and aquaculture has never ceased to allow them to enter the environment, manifested as "persistent". Such a consequence is that antibiotics selectively inhibit some environmental microorganisms in the environment and induce the emergence of some antibiotic resistance groups, thus triggering a particular ecotoxicological effect, this is why some large pharmaceutical factories and farms become the main pollution factors and ecological extinction of the surrounding rivers.
In recent years, photocatalytic degradation technology has been paid more and more attention to environmental pollution control, and photocatalytic treatment of antibiotic pollution seems to be a good solution, thus, some areas began to use photocatalytic technology to control tetracycline pollution.
The photocatalysts include tungstate series, titanium series and bismuth series. Tungstate is one of the best known photocatalysts, and bismuth tungstate is one of the best. In recent years, bismuth tungstate photocatalyst has attracted much attention in the field of environmental protection, mainly due to its following advantages: (1) Good UV and visible light response; (2) Thermal stability; (3) Photocatalytic stability; (4) The material sources are easy and the cost is relatively low; (5) Environmental friendly.
Some scholars used bismuth tungstate catalyst and doped with small amounts of ZnFe2O4 to degrade tetracycline wastewater, in the process of photocatalytic reaction, the oxidation of hydroxyl radical promotes the deamination, demethylation and other oxidation reactions of tetracycline, in the long photocatalytic reaction time, the intermediates of the macromolecules will eventually be mineralized into CO2, H2O and NH4+, and the photocatalytic degradation efficiency will reach 98%.
Studies have shown that bismuth tungstate is the bane of antibiotic wastewater such as tetracycline, and its importance to human survival is self-evident. As we all know, avian influenza and super drug resistant bacteria occur frequently in recent years, which is associated with the abuse of antibiotics in the aquaculture industry. We do not expect the pursuit of profit businessmen can find their conscience, but only hope that the rivers and lakes, the sea can be more clean, the development of light degradation technology also allows people to have more expectations of the environment.
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