|
1
|
Li J, Zhang H, Yu D, Wang W, Song W, Yang L, Jiang X, Zhao B. Mixed valence Ce-doped TiO 2 with multiple energy levels and efficient charge transfer for boosted SERS performance. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 281:121643. [PMID: 35863183 DOI: 10.1016/j.saa.2022.121643] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
Considering the variable valence characteristics of rare earth elements, they can be in a variety of valence forms coexistence. Doping of rare earth element with different valence states may produce different energy levels to tune the semiconductor energy band structure. We utilize rare earth element Ce doping TiO2 for the development of high-performance semiconductor surface-enhanced Raman scattering (SERS) substrates based on an energy-level tuning strategy. Ce doping not only forms multiple energy levels including Ce3+ and Ce4+ metal doping energy levels in the bandgap of TiO2, but also enriches the surface state level of TiO2 itself, which together promote the separation of photogenerated carriers and improve charge transfer efficiency between substrates and absorbed molecules. This endows TiO2 semiconductor substrate with a higher SERS enhancement factor, which can reach 2.2 × 106. The detectable concentration of methylene blue can be as low as 10-10 mol/L. Moreover, the semiconductor substrate exhibits excellent uniformity and stability. This study not only provides a new strategy to develop excellent semiconductor SERS substrate with multiple energy levels, but also lays the foundation for promising practical application of semiconductor substrate.
Collapse
Affiliation(s)
- Jia Li
- College of Materials Science and Engineering, College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China; Key Laboratory of Preparation and Applications of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, Changchun 130103, People's Republic of China
| | - Huizhu Zhang
- College of Materials Science and Engineering, College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China
| | - Dongxue Yu
- College of Materials Science and Engineering, College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China
| | - Weie Wang
- College of Materials Science and Engineering, College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China
| | - Wei Song
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, People's Republic of China
| | - Libin Yang
- College of Materials Science and Engineering, College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China.
| | - Xin Jiang
- College of Materials Science and Engineering, College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China.
| | - Bing Zhao
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, People's Republic of China.
| |
Collapse
|
|
2
|
Zhang W, Liu H, Liu Z, An Y, Zhong Y, Hu Z, Li S, Chen Z, Wang S, Sheng X, Zhang X, Wang X. Eu-Doped Zeolitic Imidazolate Framework-8 Modified Mixed-Crystal TiO 2 for Efficient Removal of Basic Fuchsin from Effluent. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7265. [PMID: 34885420 PMCID: PMC8658464 DOI: 10.3390/ma14237265] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 11/17/2022]
Abstract
Zeolitic imidazolate framework-8 (ZIF-8) was doped with a rare-earth metal, Eu, using a solvent synthesis method evenly on the surface of a mixed-crystal TiO2(Mc-TiO2) structure in order to produce a core-shell structure composite ZIF-8(Eu)@Mc-TiO2 adsorption photocatalyst with good adsorption and photocatalytic properties. The characterisation of ZIF-8(Eu)@Mc-TiO2 was performed via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller analysis (BET) and ultraviolet-visible light differential reflectance spectroscopy (UV-DRs). The results indicated that Eu-doped ZIF-8 was formed evenly on the Mc-TiO2 surface, a core-shell structure formed and the light-response range was enhanced greatly. The ZIF-8(Eu)@Mc-TiO2 for basic fuchsin was investigated to validate its photocatalytic performance. The effect of the Eu doping amount, basic fuchsin concentration and photocatalyst dosage on the photocatalytic efficiency were investigated. The results revealed that, when 5%-Eu-doped ZIF-8(Eu)@Mc-TiO2 (20 mg) was combined with 30 mg/L basic fuchsin (100 mL) under UV irradiation for 1 h, the photocatalytic efficiency could reach 99%. Further, it exhibited a good recycling performance. Thus, it shows certain advantages in its degradation rate and repeatability compared with previously reported materials. All of these factors suggested that, in an aqueous medium, ZIF-8(Eu)@Mc-TiO2 is an eco-friendly, sustainable and efficient material for the photocatalytic degradation of basic fuchsin.
Collapse
Affiliation(s)
- Wanqi Zhang
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (W.Z.); (H.L.); (Z.L.); (Y.A.); (Y.Z.); (S.L.)
| | - Hui Liu
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (W.Z.); (H.L.); (Z.L.); (Y.A.); (Y.Z.); (S.L.)
| | - Zhechen Liu
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (W.Z.); (H.L.); (Z.L.); (Y.A.); (Y.Z.); (S.L.)
| | - Yuhong An
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (W.Z.); (H.L.); (Z.L.); (Y.A.); (Y.Z.); (S.L.)
| | - Yuan Zhong
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (W.Z.); (H.L.); (Z.L.); (Y.A.); (Y.Z.); (S.L.)
| | - Zichu Hu
- College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China; (Z.H.); (X.S.)
| | - Shujing Li
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (W.Z.); (H.L.); (Z.L.); (Y.A.); (Y.Z.); (S.L.)
| | - Zhangjing Chen
- Department of Sustainable Biomaterials, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA;
| | - Sunguo Wang
- Sungro Bioresource & Bioenergy Technologies Corp., Edmonton, AB T6R3J6, Canada;
| | - Xianliang Sheng
- College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China; (Z.H.); (X.S.)
| | - Xiaotao Zhang
- College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China; (Z.H.); (X.S.)
- Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization, Hohhot 010018, China
| | - Ximing Wang
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (W.Z.); (H.L.); (Z.L.); (Y.A.); (Y.Z.); (S.L.)
- Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization, Hohhot 010018, China
| |
Collapse
|