Abstract
We report a new nanocomposite TiO2-poly(3-chloro-2-hydroxypropyl methacrylate) (TiO2-PCHPMA) for selective adsorption/degradation of cationic dyes and degradation of anionic dyes. TiO2-PCHPMA was prepared by free radical polymerization of CHPMA in the presence of TiO2 modified with 3-(trimethoxysilyl)propyl methacrylate. TiO2-PCHPMA adsorbed cationic methylene blue (MB), but did not adsorb anionic methyl orange (MO) in their aqueous solutions. The adsorption efficiency for MB reached 99% within 5 min at 28 °C, and adsorbed MB could be recycled in 96% efficiency. The adsorption accelerated degradation of MB under UV irradiation. The degradation of anionic MO proceeded completely with TiO2-PCHPMA under UV irradiation, and the efficiency was not affected by the PCHPMA layer. TiO2-PCHPMA is potentially applicable as a material capable of selective removal and recovery of cationic dyes, and degradation of other dyes from industrial effluents.
Highlights
Dyes are extensively used in various industrial processes, and their annual market is more than 7 × 105 t/year [1]
The morphology of TiO2, TiO2-MPS, and TiO2-PCHPMA was observed by Scanning electron microscopy (SEM) (Figure 2a–c)
We developed TiO2 -PCHPMA for selective separation and degradation of dyes
Summary
Dyes are extensively used in various industrial processes, and their annual market is more than 7 × 105 t/year [1]. From an aqueous mixture of NLP, PL, and nonane, while the mechanism of the selection is unclear [46] Such selectivity depends on the characters of the functional groups and the spaces to capture target pollutants, and the modification to improve affinity basically assisting selective degradation. This clear difference originated from the electrostatic adsorption of MB on the layer of PCHPMA and the moderate hydrophilicity of PCHPMA allowing diffusion of MO around the TiO2 core
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