4.7 Article

Ag-modified TiO2/SiO2/Fe3O4 sphere with core-shell structure for photo-assisted reduction of 4-nitrophenol

期刊

ENVIRONMENTAL RESEARCH
卷 214, 期 -, 页码 -

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2022.113690

关键词

4-Nitrophenol; Ag; TiO2-SiO2-Fe3O4; Fe3O4; core-shell; photo-assisted reduction

资金

  1. Ministry of Science and Technology, Taiwan [MOST 107-2221-E-011-156-MY3, 108-2221-E-011- 165-MY3, 110-2221-E-011-012-MY3, 110-2811-E-011-513, 111-2628- E-011 -006 -MY3]
  2. Electric Technology Research Foundation of Chugoku [MOST 107-2221-E-011-156-MY3]
  3. [17K05843]

向作者/读者索取更多资源

An Ag-loaded TiO2-SiO2-Fe3O4 sphere was prepared for the photo-assisted reduction of 4-NP, showing high activity and recyclability, making it a promising material for environmental remediation.
Nitrogen-containing contaminants, such as 4-nitrophenol (4-NP), cause detrimental effects when discharged into the environment and thus should be reduced or removed from ecosystems. In this study, an Ag-loaded TiO2/SiO2/Fe3O4 (TSF) with a core-shell structure was employed for the photo-assisted reduction of 4-NP. Fe3O4 , SiO2, and TiO(2 )in the core-shell structure served as a magnetic center, protective layer, and light absorber, respectively. To improve the reduction activity of 4-NP, Ag was loaded onto TSF under stirring, with a variation of the temperature (2-130 C) and reaction time (1, 2, and 4 h). Under the optimized conditions, 5Ag-TSF (with 5 wt% of Ag) could promote the reduction of aqueous 4-NP solution (2 x 10-4 M, 75 mL) in the presence of NaBH4 (0.1 M, 5 mL) under irradiation by a metal halide lamp, affording over 98% reduction within 5 min and a rate constant of 0.185 min -1, demonstrating its promising activity. Moreover, due to the advantages of the core-shell structure, the magnetic properties of Fe3O4 were sufficient to enable facile recycling of the sample for further reaction; SiO(2)could protect the Fe3O4 center from oxidation or reduction; TiO(2)enabled Ag accommodation and absorbed light to generate electron-hole pairs. In summary, an Ag-loaded TiO2-SiO2-Fe3O4 sphere with high activity and recyclability for 4-NP reduction was prepared via a facile and simple stirring method, where the sample can be used as a promising material in environmental remediation.

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