Thermally driven characteristic and highly photocatalytic activity based on <i>N</i>-isopropyl acrylamide/high-substituted hydroxypropyl cellulose/g-C<sub>3</sub>N<sub>4</sub> hydrogel by electron beam pre-radiation method

Published on 2020-08-05T12:10:39Z (GMT) by
<div><p>A new type of <i>N</i>-isopropyl acrylamide/high-substituted hydroxypropyl cellulose/graphite carbon nitride (NIPAAm/HHPC/g-C<sub>3</sub>N<sub>4</sub>) smart hydrogel-based photocatalyst with thermally driven characteristic was successfully prepared by electron beam pre-radiation polymerization and radiation cross-linking methods. The agglomeration and loss of g-C<sub>3</sub>N<sub>4</sub> nanosheets can be avoided effectively, and ensured high photocatalytic activity under visible light, once the g-C<sub>3</sub>N<sub>4</sub> nanosheets are uniformly dispersed into the skeleton of a thermosensitive NIPAAm/HHPC hydrogel. NIPAAm/HHPC/g-C<sub>3</sub>N<sub>4</sub> (NHC) hydrogel was characterized by nuclear magnetic resonance spectroscopy, Fourier-transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and diffuse reflectance spectroscopy. The microstructure of NHC was further characterized by scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller. The adsorption–photocatalytic removal rate of rhodamine B reached 71.4% at the mass ratio of g-C<sub>3</sub>N<sub>4</sub> of 0.8% (NHC-0.8%) hydrogel in an aqueous medium under visible light. The thermal shrinkage ratio can reach 90.6% at 60°C after 5 min and could effectively achieve the function of recycling-free in a portable photocatalytic reaction device under the optimal conditions. Possible mechanism of adsorption–photocatalysis and thermally driven recycling-free on NHC hydrogel was also obtained. These thermally driven recycling-free characteristic and highly photocatalytic properties of the hybrid hydrogel-based photocatalyst show that it can be used as a promising new material with extensive applications in wastewater treatment.</p></div>

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Liu, Guo; Li, Ting-Ting; Song, Xiao-Fang; Yang, Jin-Yu; Qin, Jiang-Tao; Zhang, Fang-Fang; et al. (2020): Thermally driven characteristic and highly photocatalytic activity based on N-isopropyl acrylamide/high-substituted hydroxypropyl cellulose/g-C3N4 hydrogel by electron beam pre-radiation method. SAGE Journals. Collection.