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Mori K, Qian X, Kuwahara Y, Horiuchi Y, Kamegawa T, Zhao Y, Louis C, Yamashita H. Design of Advanced Functional Materials Using Nanoporous Single-Site Photocatalysts. CHEM REC 2019; 20:660-671. [PMID: 31833628 DOI: 10.1002/tcr.201900085] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/23/2019] [Accepted: 10/29/2019] [Indexed: 11/11/2022]
Abstract
Nanoporous silica solids can offer opportunities for hosting photocatalytic components such as various tetra-coordinated transition metal ions to form systems referred to as "single-site photocatalysts". Under UV/visible-light irradiation, they form charge transfer excited states, which exhibit a localized charge separation and thus behave differently from those of bulk semiconductor photocatalysts exemplified by TiO2 . This account presents an overview of the design of advanced functional materials based on the unique photo-excited mechanisms of single-site photocatalysts. Firstly, the incorporation of single-site photocatalysts within transparent porous silica films will be introduced, which exhibit not only unique photocatalytic properties, but also high surface hydrophilicity with self-cleaning and antifogging applications. Secondary, photo-assisted deposition (PAD) of metal precursors on single-site photocatalysts opens up a new route to prepare nanoparticles. Thirdly, visible light sensitive photocatalysts with single and/or binary oxides moieties can be prepared so as to use solar light, the ideal energy source.
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Affiliation(s)
- Kohsuke Mori
- Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Elements Strategy Initiative for Catalysts & Batteries ESICB, Kyoto University, Katsura, Kyoto, 615-8520
| | - Xufang Qian
- Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai, 200240, P.R. China
| | - Yasutaka Kuwahara
- Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Elements Strategy Initiative for Catalysts & Batteries ESICB, Kyoto University, Katsura, Kyoto, 615-8520
| | - Yu Horiuchi
- Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Department of Applied Chemistry, Graduate school of engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Takashi Kamegawa
- Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Department of Applied Chemistry, Graduate school of engineering, Osaka Prefecture University, 1-2, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8570, Japan
| | - Yixin Zhao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai, 200240, P.R. China
| | - Catherine Louis
- Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Sorbonne Université, UMR CNRS 7197, Laboratoire de Réactivité de Surface, 4 Place Jussieu, F-75252, Paris, France
| | - Hiromi Yamashita
- Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Elements Strategy Initiative for Catalysts & Batteries ESICB, Kyoto University, Katsura, Kyoto, 615-8520
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Titanium dioxide as a catalyst support in heterogeneous catalysis. ScientificWorldJournal 2014; 2014:727496. [PMID: 25383380 PMCID: PMC4213406 DOI: 10.1155/2014/727496] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 07/22/2014] [Accepted: 08/10/2014] [Indexed: 01/16/2023] Open
Abstract
The lack of stability is a challenge for most heterogeneous catalysts. During operations, the agglomeration of particles may block the active sites of the catalyst, which is believed to contribute to its instability. Recently, titanium oxide (TiO2) was introduced as an alternative support material for heterogeneous catalyst due to the effect of its high surface area stabilizing the catalysts in its mesoporous structure. TiO2 supported metal catalysts have attracted interest due to TiO2 nanoparticles high activity for various reduction and oxidation reactions at low pressures and temperatures. Furthermore, TiO2 was found to be a good metal oxide catalyst support due to the strong metal support interaction, chemical stability, and acid-base property. The aforementioned properties make heterogeneous TiO2 supported catalysts show a high potential in photocatalyst-related applications, electrodes for wet solar cells, synthesis of fine chemicals, and others. This review focuses on TiO2 as a support material for heterogeneous catalysts and its potential applications.
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Hua M, Zhang S, Pan B, Zhang W, Lv L, Zhang Q. Heavy metal removal from water/wastewater by nanosized metal oxides: a review. JOURNAL OF HAZARDOUS MATERIALS 2012; 211-212:317-31. [PMID: 22018872 DOI: 10.1016/j.jhazmat.2011.10.016] [Citation(s) in RCA: 901] [Impact Index Per Article: 75.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 09/29/2011] [Accepted: 10/04/2011] [Indexed: 05/17/2023]
Abstract
Nanosized metal oxides (NMOs), including nanosized ferric oxides, manganese oxides, aluminum oxides, titanium oxides, magnesium oxides and cerium oxides, provide high surface area and specific affinity for heavy metal adsorption from aqueous systems. To date, it has become a hot topic to develop new technologies to synthesize NMOs, to evaluate their removal of heavy metals under varying experimental conditions, to reveal the underlying mechanism responsible for metal removal based on modern analytical techniques (XAS, ATR-FT-IR, NMR, etc.) or mathematical models, and to develop metal oxide-based materials of better applicability for practical use (such as granular oxides or composite materials). The present review mainly focuses on NMOs' preparation, their physicochemical properties, adsorption characteristics and mechanism, as well as their application in heavy metal removal. In addition, porous host supported NMOs are particularly concerned because of their great advantages for practical application as compared to the original NMOs. Also, some magnetic NMOs were included due to their unique separation performance.
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Affiliation(s)
- Ming Hua
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China
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