2020年10月28日星期三

EDTA Wastewater Photocatalytic Oxidation with Bismuth Tungstate

EDTA is a highly effective chelating agent. It has been widely used in chemical analysis, electroplating, medicine, industrial washing products, photographic products and other industries.

Unfortunately, EDTA can chelate with Mg2+, Ca2+, Mn2+, Cu2+, Fe2+ and other 50 kinds of metal ions to form water soluble chelates, especially the formation and some toxic metal ions is harmful and difficult from the material, excellent stability, will cause heavy metal diffusion, thus adding heavy environmental pollution.

Due to the stability of chelating agents, the degradation of EDTA is more difficult than traditional treatment methods, so bismuth tungstate photocatalyst has become a hot choice again.

The fact that bismuth tungstate is can play a big role, especially in the petal like Bi2WO6, visible light catalytic activity is high, can split water to produce oxygen and organic matter degradation, is a kind of photocatalytic agent ideal for environmental pollution control.
 
Some scholars used Bi2WO6 to do photocatalytic chemical test in the self-made photocatalytic reactor. 100m L containing a single heavy metal copper Cu-EDTA composite pollution solution, after the addition of Bi2WO6, the light intensity is 100m W/cm2. The photocatalytic reaction time was 4h.
 

The experimental results show that under visible light irradiation, Bi2WO6 is excited by visible light, producing photogenerated electrons on the conduction band and generating photogenerated holes on the valence band. The cavity can react with OH + in the solution or produce active oxide on the catalyst surface, which has strong oxidation capacity. The coordination bonds between Cu-EDTA complex ions were destroyed firstly, and EDTA was oxidized and TOC decreased with the oxidation of active oxide. On Cu-EDTA, Cu2+ dissolved in the solution and was adsorbed by Bi2WO6 again. Cu2+ capture photogenerated electrons are reduced to Cu0, deposited on the surface of Bi2WO6, formed CuO/, Bi2WO6 capture is reduced, EDTA capture h+ is oxidized, once again inhibit electron and hole recombination, improve photocatalytic efficiency.

Bismuth tungstate once again demonstrated its strong photocatalytic properties with the strength, not only is copper or EDTA, ethylenediaminetetraacetic acid manganese and magnesium and calcium, iron, EDTA almost all can be treated with bismuth tungstate.

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