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      https://www.ias.ac.in/article/fulltext/boms/044/0226

    • Keywords

       

      Photocatalyst; visible light; antibiotic; porous materials; composite materials.

    • Abstract

       

      Removal of antibiotics detected in wastewater or natural aquatic systems by regular municipal treatment is challenging. Photocatalysis is considered to be the most well-known and green strategy for such removal. However, the catalytic efficiency is restricted by UV radiation dependence, fast electron-hole recombination, and low porosity/surface area of the photocatalyst. In this study, we have developed a highly porous anatase TiO$_2$-polymethylsilsesquioxane(PMSQ) aerogel with nonmetal carbon dopant, which can simultaneously enhance the adsorption ability and visible light photo-activity. And tetracycline hydrochloride (TCH) was selected as a model antibiotic. A high surface area (747 g cm$^{-3}$) C-TiO2-PMSQ aerogel can remove 91% TCH within 180 min under visible light. But the removal needs to be in an isopropyl alcohol/water co-solvent, due to the intrinsic hydrophobicity of PMSQ. After a heat treatment under 400°C, the surface area of C-TiO$_2$-PMSQ aerogel decreases to 618 g cm$^{-3}$, and the sample loses its hydrophobicity, the removal of TCH can be in aqueous condition and the efficiency increases to 98%. Moreover, both catalysts can be recycled 7 times and still maintain high removal efficiency (85 and 64% remained for hydrophobic and hydrophilic gels, respectively).

    • Author Affiliations

       

      HAILONG XU1 YUE DING1 SHUANG YANG2 HUI ZHANG1 XIN WANG3 JILONG YUAN1 MENG LONG1 QIANG ZHAO4 YUNFENG LIU1

      1. The People’s Hospital of Liaoning Province, Shenyang 110016, China
      2. Hospital of Stomatology, China Medical University, Shenyang 110002, China
      3. Dalian Medical University, Dalian 116044, China
      4. College of Life Science, Zhejiang University, Hangzhou 310012, China
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