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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.
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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
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Brigante M, Schulz PC. Remotion of the antibiotic tetracycline by titania and titania-silica composed materials. JOURNAL OF HAZARDOUS MATERIALS 2011; 192:1597-608. [PMID: 21782336 DOI: 10.1016/j.jhazmat.2011.06.082] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Accepted: 06/28/2011] [Indexed: 05/13/2023]
Abstract
Removal of the antibiotic tetracycline (TC) by TiO(2) and the mesoporous binary system TiO(2)-SiO(2) have been studied in batch experiments by performing adsorption isotherms/kinetics and photodegradation kinetics under different conditions of pH, supporting electrolyte concentration, temperature, adsorbent amount, and TiO(2)-loading. On the one hand, the adsorption of TC on the studied materials is strongly dependent on pH, increasing as pH decreases. The adsorption mechanism, controlled by diffusion processes, is strongly related to electrostatic attractions and H-bond formations mainly between amide, carbonylic and phenolic groups of the antibiotic and the functional groups of TiO(2). The adsorption capacity at constant pH increases in the order TiO(2)<TiO(2)-SiO(2) mainly due to the highly surface area that the silica offers and to the homogenously dispersion of the TiO(2) nanocrystallites. On the other hand, the photodegradation rate is affected by the presence of the studied materials at several pH, although its photocatalytic activities are more important at pH 7 or lower. The photodegradation mechanisms seem to be related to the formation of OH radicals which are responsible for the decomposition of TC. The composed titania-silica materials might act not only as an excellent adsorbent but also act as an alternative photocatalyst for pollution control.
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Affiliation(s)
- Maximiliano Brigante
- INQUISUR, Departamento de Química, Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahía Blanca, Argentina.
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Brigante M, Schulz PC. Adsorption of paraquat on mesoporous silica modified with titania: effects of pH, ionic strength and temperature. J Colloid Interface Sci 2011; 363:355-61. [PMID: 21843892 DOI: 10.1016/j.jcis.2011.07.061] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Revised: 07/13/2011] [Accepted: 07/15/2011] [Indexed: 10/17/2022]
Abstract
The adsorption of the herbicide paraquat (PQ(2+)) on the binary system titania-silica has been studied in batch experiments by performing adsorption isotherms under different conditions of pH, supporting electrolyte concentration, and temperature. Adsorption kinetic on the studied material has also been carried out and discussed. PQ(2+) adsorption is very low on the bare silica surface but important on the composed TiO(2)-SiO(2) adsorbent. In this last case, the adsorption increases by increasing pH and decreasing electrolyte concentration. There are no significant effects of temperature on the adsorption. The increase of the adsorption in TiO(2)-SiO(2) seems to be related to an increase in acid sites of the supported titania and to the homogenously dispersion of the TiO(2) nanoparticles over the silica support. The adsorption takes place by direct binding of PQ(2+) to TiO(2) leading to the formation of surface species of the type SiO(2)-TiO(2)-PQ(2+). Electrostatic interactions and charge-transfer and outer-sphere complexes formations seem to play a key role in the adsorption mechanism. The analysis of thermodynamic parameters suggests that the adsorption on TiO(2)-SiO(2) is endothermic and spontaneous in nature.
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Affiliation(s)
- Maximiliano Brigante
- INQUISUR, Departamento de Química, Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahía Blanca, Argentina.
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