Study on the preparation of molecularly imprinted ZrO 2 -TiO 2 photocatalyst and the degradation performance of hydroquinone

In this paper, molecularly imprinted Zr-doped TiO 2 photocatalysts (MIP-ZrO 2 -TiO 2 ) were prepared by the molecularly imprinted sol–gel method for the photocatalytic degradation study of hydroquinone (HQ) as the target pollutant. For the effectiveness of the MIP-ZrO 2 -TiO 2 catalyst in degrading HQ, the effects of Zr doping ratio, imprinted molecule dosage, calcination conditions, and pollutant concentration on its photocatalytic activity were investigated. XRD, TEM, XPS, and other techniques were used to evaluate the materials, and the findings revealed that MIP-ZrO 2 -TiO 2 films with imprinted HQ were successfully produced on the ZrO 2 -TiO 2 surface. The optimal preparation conditions were n(Ti):n(Zr) = 100:8, m(HQ) = 1.5 g, 550 °C for the calcination temperature, and 2 h for the calcination duration. The optimum reaction conditions were 10 mg/L HQ concentration, 1 g/L catalyst dose, and a pH of 6.91. According to the findings of photocatalytic tests, during 30 min of UV lamp (365 nm) irradiation, the degradation rates of MIP-ZrO 2 -TiO 2 , ZrO 2 -TiO 2 , and TiO 2 for HQ were 90.58%, 83.94%, and 58.30%, respectively. The findings revealed that the doping of Zr metal and the addition of imprinted molecules improved the photocatalytic activity of TiO 2 , which can be used for the efficient treatment of low concentrations of hard-to-degrade hydroquinone.