Photocatalytic Degradation of the Insecticide Acetamiprid on TiO2 Catalyst

نویسندگان

  • Valéria J. Guzsvány
  • János J. Csanádi
  • Sanja D. Lazić
  • Ferenc F. Gaál
چکیده

O trabalho está relacionado com a degradação fotocatalítica da acetamipride, uma base piridínica amplamente utilizada em inseticida neonicotinóides, em suspensões aquosas de O 2 /TiO 2 irradiada por UV. A taxa de degradação foi estudada por HPLC/DAD e espectrofotometria UV. Verificou-se que a reação é de pseudo-primeira ordem, no intervalo de concentração de (0,5-2,0 mg cm). A análise de RMN de H indicou que além do acetaldeído, ácido fórmico e acético, foram formados intermediários contendo piridina (por exemplo, o ácido 6-chloronicotínico). Medidas por CLAE/EM revelaram também a presença da degradação de aromáticos intermediários. Durante o processo fotocatalítico o pH sofreu alteração de três unidades, de 5 a 2. Em contraste com os resultados obtidos nas condições experimentais na degradação fotocatalítica, a acetamipride mostrou-se estável. Para ter uma visão específica do complexo processo fotocatalítico da acetamipride, a degradação fotocatalítica do ácido 6-cloronicotínico, também foi investigada o produto detectado da degradação da base piridínica.

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تاریخ انتشار 2008