The irradiation degradation of methamidophos in aqueous solutions by 60 Co-γ rays was investigated. The effects of absorbed doses, saturated gas, and the additive of H 2 O 2 on the degradation were also studied. The results showed that the oxidative radical, such as •OH, played an important role in the irradiation degradation of methamidophos; while the reductive radicals, aq e − and •H, had no contribution to the degradation. The degradation rate of methamidophos increased with the increase of the irradiation dosage. At certain irradiation dosage, methamidophos could be degraded completely. The degradation rate of methamidophos in the solution saturated with oxygen was higher than those saturated with other gases, which reached 100% when the absorbed dose was 8 kGy. H 2 O 2 degraded methamidophos slowly when it was used alone, but could accelerate the degradation obviously when it was used with irradiation together.
In this work, BiVO4/Bi-X (X represented the quality of adding NaNH4, X = 0.1, 0.3 and 0.5) are synthesized through two-step hydrothermal methods. The photoelectrochemical (PEC) experiments demonstrate that the PEC properties of BiVO4/Bi-0.3 bear the best PEC performance compared with other materials. Meanwhile, UV–vis Diffuse reflection spectra (DRS) and photoluminescence (PL) also affirm that the Bi metal SPR effect is able to improve the energy conversion efficiency. For this reason, the PEC sensors based on a bifunctional BiVO4/Bi-0.3 are fabricated, which demonstrates a broad linear range from 0.2–118 μM and 0.05–100 μM for sensing ascorbic acid (AA) and Dopamine (DA).
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