The photocatalytic selectivity between molecularly imprinted TiO 2 and target contaminants
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RESEARCH PAPER
The photocatalytic selectivity between molecularly imprinted TiO2 and target contaminants Xian Liu & Lei Zhu & Xun Wang & Xide Meng & Lingjun Zhong
Received: 12 January 2020 / Accepted: 1 July 2020 # Springer Nature B.V. 2020
Abstract In this paper, it is proposed that the photocatalysis selectivity exists between the catalysts and the target contaminants. Therefore, the selectivity of the two catalysts, MIP-TiO2 and NIP-TiO2, can be distinguished by using the same test wavelength to measure the absorbance of different pollutants and different test wavelength to measure the absorbance of the pollutants. At first, MIP-TiO2 was obtained in one step to degrade ethyl parahydroxybenzoate wastewater. Then, the effects of test wavelength and test time on the standard curve, reaction rate, selectivity coefficient, and selectivity factor, as well as the effect of the amount of molecular imprinting on photocatalytic activity and selectivity are studied through photocatalytic experiments. XRD, FT-IR, and TEM were used to characterize the catalysts. The results show that the test wavelength and reaction time have impact on the reaction rate, selectivity coefficient, while selectivity factor, and have no effect on the simulation of the standard curve. Furthermore, the selectivity factor does not change its applicability to calculate the selectivity due to the different selectivity coefficients. In addition, the degradation rate of target contaminants in 2 h by MIP-TiO2 is 81%, while X. Liu : L. Zhu (*) : X. Wang (*) : X. Meng Wuhan University of Science and Technology, School of Urban Construction, Wuhan 430065, China e-mail: [email protected] e-mail: [email protected] L. Zhong University of Alberta, Agricultural, Life & Environmental Sciences, Edmonton, Canada
NIP-TiO2 is only 74%. Moreover, MIP-TiO2 has a selectivity factor of 2.680, indicating that it has a higher selectivity for target contaminants than NIP-TiO2. This paper provides a further understanding of the photocatalytic selectivity between molecularly imprinted TiO2 and target contaminants.
Keywords Molecular imprinting . TiO2 . Target contaminants . Photocatalytic selectivity
Introduction Molecular imprinting technology of TiO2 is a photocatalytic technology with a very broad application prospect (Zhou et al. 2018). By modifying the imprint of different target contaminants on TiO2 molecules through different methods, molecularly imprinted TiO2 (MIP-TiO2) can be synthesized to achieve selective removal of target contaminants (Sharabi and Paz 2010; Sajini et al. 2019; Ayekoe et al. 2016; Fiorenza et al. 2020; Zhang and Luo 2011). However, the current practical application effect of this technology is not very significant. As it has not yet been adapted to all contaminants, thus it is difficult to widely promote this technology currently. For non-molecularly imprinted TiO2 (NIP-TiO2), it can oxidize most contaminants non-selectively by generating photo-generated carriers such as hydroxyl radicals and photo-generated holes, so it has a wider applicat
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