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Abstract: A molecularly imprinted polymer layer coated on TiO2/carbon nanodots (TiO2/CNDs/MIP) as a novel nanocomposite was successfully synthesized by means of the surface molecularly imprinted technique using pendimethalin (PM) herbicide as the template molecule. O-phenylenediamine was used both as the functional monomer for MIP and as the precursor of carbon nanodots. The structure and properties of the nanoparticles and nanocomposites were characterized by FE-SEM, EDX, TEM, DLS, XRD, XPS, PL, FT-IR, BET, and UV-vis DRS. The photocatalytic activity, adsorption capacity, and adsorption selectivity of TiO2/CNDs/MIP and TiO2/CNDs/NIP were investigated. The results indicated that TiO2/CNDs/MIP nanocomposite exhibited the high adsorption capacity of 86.1 mg/g in 30 min and an excellent selectivity toward PM compared to other structural analogues due to the imprinted cavities and specific recognition sites on the surface of MIP. In addition, the TiO2/CNDs/MIP nanocomposite revealed the enhanced photodegradation efficiency (about 95%) of PM compared with TiO2, TiO2/CNDs, and TiO2/CNDs/NIP, as a result of its large adsorption capacity to template molecules and its narrow band gap energy under visible light. Using charge carrier scavengers, it was revealed that the O2- radicals were the main surface species for the photodegradation of PM. Moreover, TiO2/CNDs/MIP nanocomposite exhibited reusability and high stability
Template and target information: pendimethalin
Author keywords: molecular imprinting, Pendimethalin, Carbon nanodot, TIO2, Photodegradation