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Eddy DR, Nur Sheha GA, Permana MD, Saito N, Takei T, Kumada N, Irkham, Rahayu I, Abe I, Sekine Y, Oyumi T, Izumi Y. Study on triphase of polymorphs TiO 2 (anatase/rutile/brookite) for boosting photocatalytic activity of metformin degradation. CHEMOSPHERE 2024; 351:141206. [PMID: 38219987 DOI: 10.1016/j.chemosphere.2024.141206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/16/2024]
Abstract
The elution of pharmaceutical products such as metformin at higher concentrations than the safe level in aquatic systems is a serious threat to human health and the ecosystem. Photocatalytic technology using TiO2 semiconductors potentially fixes this problem. This study aims to synthesize triphasic anatase-rutile-brookite TiO2 using ultrasound assisted sol-gel technique in the presence of acid and its application to photodegradation of metformin under UV light irradiation. Based on X-ray diffraction analysis, a TiO2 sample consisted of anatase (76%), rutile (7%), and brookite (17%) polymorph (A76R7B17) that was fully crystallized. Scanning electron microscopy (EM)-energy dispersive X-ray spectra results showed agglomerated triphasic A76R7B17 with irregular spherical clusters. Transmission EM results revealed that the crystal size of A76R7B17 was 4-14 nm. The Brunauer-Emmett-Teller analysis showed the sample's specific surface area of 149 m2 g-1. The degradation test of metformin demonstrated that the A76R7B17 exhibited a 75.4% degradation efficiency after 120 min under UV light irradiation, significantly higher than using biphasic and single-phase TiO2 photocatalysts. This difference could be attributed to the heterojunction effect of triphasic materials that effectively reduced electron-hole recombination rate as well as the combination of effective electron transfer from conduction band of brookite and anatase and the utilization of wider range of UV-visible light using rutile.
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Affiliation(s)
- Diana Rakhmawaty Eddy
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia.
| | - Geometry Amal Nur Sheha
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia
| | - Muhamad Diki Permana
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia; Special Educational Program for Green Energy Conversion Science and Technology, Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of Yamanashi, Kofu, 400-8511, Japan; Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Norio Saito
- Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Irkham
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia
| | - Iman Rahayu
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia
| | - Ikki Abe
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Yuta Sekine
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Tomoki Oyumi
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Yasuo Izumi
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
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Miu BA, Stan MS, Mernea M, Dinischiotu A, Voinea IC. Pure Epigallocatechin-3-gallate-Assisted Green Synthesis of Highly Stable Titanium Dioxide Nanoparticles. MATERIALS (BASEL, SWITZERLAND) 2024; 17:275. [PMID: 38255442 PMCID: PMC10821086 DOI: 10.3390/ma17020275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 12/31/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024]
Abstract
Nanoparticles (NPs) are conventionally produced by using physical and chemical methods that are no longer in alignment with current society's demand for a low environmental impact. Accordingly, green synthesis approaches are considered a potential alternative due to the plant extracts that substitute some of the hazardous reagents. The general mechanism is based on the reducing power of natural products that allows the formation of NPs from a precursor solution. In this context, our study proposes a simple, innovative, and reproducible green approach for the synthesis of titanium dioxide (TiO2 NPs) that uses, for the first time, the major component of green tea (Camellia sinensis)-epigallocatechin-3-gallate (EGCG), a non-toxic, dietary, accessible, and bioactive molecule. The influence of EGCG on the formation of TiO2 NPs was analyzed by comparing the physicochemical characteristics of green synthesized NPs with the chemically obtained ones. The synthesis of bare TiO2 NPs was performed by hydrolysis of titanium isopropoxide in distilled water, and green TiO2 NPs were obtained in the same conditions, but in the presence of a 1 mM EGCG aqueous solution. The formation of TiO2 NPs was confirmed by UV-VIS and FTIR spectroscopy. SEM micrographs showed spherical particles with relatively low diameters. Our findings also revealed that green synthesized NPs were more stable in colloids than the chemically synthesized ones. However, the phytocompound negatively influenced the formation of a crystalline structure in the green synthesized TiO2 NPs. Furthermore, the synthesis of EGCG-TiO2 NPs could become a versatile choice for applications extending beyond photocatalysis, including promising prospects in the biomedical field.
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Affiliation(s)
- Bogdan Andrei Miu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91–95 Splaiul Independentei, 050095 Bucharest, Romania; (B.A.M.); (A.D.); (I.C.V.)
- Sp@rte Team, Institute of Genetics and Development of Rennes, UMR6290 CNRS, University of Rennes 1, 35042 Rennes, France
| | - Miruna Silvia Stan
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91–95 Splaiul Independentei, 050095 Bucharest, Romania; (B.A.M.); (A.D.); (I.C.V.)
- Research Institute of the University of Bucharest (ICUB), University of Bucharest, 050657 Bucharest, Romania
| | - Maria Mernea
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, 91–95 Splaiul Independentei, 050095 Bucharest, Romania;
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91–95 Splaiul Independentei, 050095 Bucharest, Romania; (B.A.M.); (A.D.); (I.C.V.)
| | - Ionela Cristina Voinea
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91–95 Splaiul Independentei, 050095 Bucharest, Romania; (B.A.M.); (A.D.); (I.C.V.)
- Research Institute of the University of Bucharest (ICUB), University of Bucharest, 050657 Bucharest, Romania
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Zhong Y, Zhang X, Xia Y, Zhang L, Xu Q, Zhu X, Feng W, Qin Q. A Fresh Perspective on the Impact of ZnTiO 3 Coupling on the Microstructure and Photocatalytic Properties of TiO 2 Fabricated at Varied Temperatures. Molecules 2023; 28:7626. [PMID: 38005348 PMCID: PMC10675743 DOI: 10.3390/molecules28227626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/13/2023] [Accepted: 11/14/2023] [Indexed: 11/26/2023] Open
Abstract
ZnTiO3/TiO2 composite photocatalysts were synthesized via the sol-gel technique, and the impact of varying heat treatment temperatures (470, 570, 670 °C) on their crystalline arrangement, surface morphology, elemental composition, chemical state, specific surface area, optical characteristics, and photocatalytic efficacy was systematically investigated. The outcomes revealed that, as the temperature ascends, pure TiO2 undergoes a transition from anatase to rutile, ultimately forming a hybrid crystal structure at 670 °C. The incorporation of ZnTiO3 engenders a reduction in the TiO2 grain dimensions and retards the anatase-to-rutile phase transition. Consequently, the specimens manifest a composite constitution of anatase and ZnTiO3. In contrast, for pure TiO2, the specimen subjected to 670 °C annealing demonstrates superior photocatalytic performance due to its amalgamated crystal arrangement. The degradation efficacy of methylene blue (MB) aqueous solution attains 91% within a 60-min interval, with a calculated first-order reaction rate constant of 0.039 min-1. Interestingly, the ZnTiO3/TiO2 composite photocatalysts exhibit diminished photocatalytic activity in comparison to pristine TiO2 across all three temperature variations. Elucidation of the photocatalytic mechanism underscores that ZnTiO3 coupling augments the generation of photogenerated charge carriers. Nonetheless, concurrently, it undermines the crystalline integrity of the composite, yielding an excess of amorphous constituents that impede the mobility of photoinduced carriers. This dual effect also fosters escalated recombination of photogenerated charges, culminating in diminished quantum efficiency and reduced photocatalytic performance.
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Affiliation(s)
- Yuanyuan Zhong
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Xiuping Zhang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Yangwen Xia
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Ling Zhang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Qiao Xu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
| | - Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
- Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643002, China
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (Y.Z.); (X.Z.); (Y.X.); (L.Z.); (Q.X.)
- Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643002, China
| | - Qin Qin
- Intelligent Manufacturing College, Chengdu Jincheng College, Chengdu 611731, China;
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Maldonado A, Cheuquepan P, Gutiérrez S, Gallegos N, Donoso M, Hauser C, Arrieta MP, Torres A, Bruna J, Valenzuela X, Guarda A, Galotto M, Rodríguez-Mercado F. Study of Ethylene-Removing Materials Based on Eco-Friendly Composites with Nano-TiO 2. Polymers (Basel) 2023; 15:3369. [PMID: 37631429 PMCID: PMC10459049 DOI: 10.3390/polym15163369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/04/2023] [Accepted: 08/08/2023] [Indexed: 08/27/2023] Open
Abstract
Ethylene is a phytohormone that is responsible of fruit and vegetable ripening. TiO2 has been studied as a possible solution to slowing down unwanted ripening processes, due to its photocatalytic capacity which enables it to remove ethylene. Thus, the objective of this study was to develop nanocomposites based on two types of eco-friendly materials: Mater-Bi® (MB) and poly(lactic acid) (PLA) combined with nano-TiO2 for ethylene removal and to determine their ethylene-removal capacity. First, a physical-chemical characterization of nano-TiO2 of different particle sizes (15, 21, 40 and 100 nm) was done through structural and morphological analysis (DRX, FTIR and TEM). Then, its photocatalytic activity and the ethylene-removal capacity were determined, evaluating the effects of time and the type of light irradiation. With respect to the analysis of TiO2 nanoparticles, the whole samples had an anatase structure. According to the photocatalytic activity, nanoparticles of 21 nm showed the highest activity against ethylene (~73%). The results also showed significant differences in ethylene-removal activity when comparing particle size and type and radiation time. Thus, 21 nm nano-TiO2 was used to produce nanocomposites through the melt-extrusion process to simulate industrial processing conditions. With respect to the nanocomposites' ethylene-removing properties, there were significant differences between TiO2 concentrations, with samples with 5% of active showed the highest activity (~57%). The results obtained are promising and new studies are needed to focus on changes in material format and the evaluation in ethylene-sensitive fruits.
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Affiliation(s)
- Alba Maldonado
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
| | - Paulina Cheuquepan
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
| | - Sofía Gutiérrez
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
| | - Nayareth Gallegos
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
| | - Makarena Donoso
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
| | - Carolin Hauser
- Department of Applied Chemistry, Nuremberg Institute of Technology Georg Simon Ohm, Keßlerplatz 12, 90489 Nuremberg, Germany;
| | - Marina P. Arrieta
- Departamento Ingeniería Química Industrial y del Medio Ambiente, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, (ETSII-UPM), Calle José Gutiérrez Abascal 2, 28006 Madrid, Spain;
| | - Alejandra Torres
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
- Department of Food Science and Technology, Faculty of Technology, Universidad de Santiago de Chile, Avenida Víctor Jara 3769, Santiago 9170124, Chile
| | - Julio Bruna
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
- Department of Food Science and Technology, Faculty of Technology, Universidad de Santiago de Chile, Avenida Víctor Jara 3769, Santiago 9170124, Chile
| | - Ximena Valenzuela
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
- Department of Food Science and Technology, Faculty of Technology, Universidad de Santiago de Chile, Avenida Víctor Jara 3769, Santiago 9170124, Chile
| | - Abel Guarda
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
- Department of Food Science and Technology, Faculty of Technology, Universidad de Santiago de Chile, Avenida Víctor Jara 3769, Santiago 9170124, Chile
| | - María Galotto
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
- Department of Food Science and Technology, Faculty of Technology, Universidad de Santiago de Chile, Avenida Víctor Jara 3769, Santiago 9170124, Chile
| | - Francisco Rodríguez-Mercado
- Packaging Innovation Center (LABEN–Chile), Universidad de Santiago de Chile, Obispo Umaña 050, Santiago 9170201, Chile; (P.C.); (S.G.); (N.G.); (M.D.); (A.T.); (J.B.); (X.V.); (A.G.); (M.G.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Alameda 3363, Santiago 9170022, Chile
- Department of Food Science and Technology, Faculty of Technology, Universidad de Santiago de Chile, Avenida Víctor Jara 3769, Santiago 9170124, Chile
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Adesina MO, Block I, Günter C, Unuabonah EI, Taubert A. Efficient Removal of Tetracycline and Bisphenol A from Water with a New Hybrid Clay/TiO 2 Composite. ACS OMEGA 2023; 8:21594-21604. [PMID: 37360480 PMCID: PMC10286278 DOI: 10.1021/acsomega.3c00184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 05/05/2023] [Indexed: 06/28/2023]
Abstract
New TiO2 hybrid composites were prepared from kaolin clay, predried and carbonized biomass, and titanium tetraisopropoxide and explored for tetracycline (TET) and bisphenol A (BPA) removal from water. Overall, the removal rate is 84% for TET and 51% for BPA. The maximum adsorption capacities (qm) are 30 and 23 mg/g for TET and BPA, respectively. These capacities are far greater than those obtained for unmodified TiO2. Increasing the ionic strength of the solution does not change the adsorption capacity of the adsorbent. pH changes only slightly change BPA adsorption, while a pH > 7 significantly reduces the adsorption of TET on the material. The Brouers-Sotolongo fractal model best describes the kinetic data for both TET and BPA adsorption, predicting that the adsorption process occurs via a complex mechanism involving various forces of attraction. Temkin and Freundlich isotherms, which best fit the equilibrium adsorption data for TET and BPA, respectively, suggest that adsorption sites are heterogeneous in nature. Overall, the composite materials are much more effective for TET removal from aqueous solution than for BPA. This phenomenon is assigned to a difference in the TET/adsorbent interactions vs the BPA/adsorbent interactions: the decisive factor appears to be favorable electrostatic interactions for TET yielding a more effective TET removal.
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Affiliation(s)
- Morenike O. Adesina
- Institute
of Chemistry, University of Potsdam, D-14476 Potsdam, Germany
- African
Centre of Excellence for Water and Environment Research (ACEWATER), Redeemer’s University, PMB 230 Ede, Osun State 232101, Nigeria
- Department
of Chemical Sciences, Redeemer’s
University, PMB 230 Ede, Osun State 232101, Nigeria
- Lead
City University, Ibadan 200255, Oyo State, Nigeria
| | - Inga Block
- Institute
of Chemistry, University of Potsdam, D-14476 Potsdam, Germany
| | - Christina Günter
- Institute
of Geosciences, University of Potsdam, D-14476 Potsdam, Germany
| | - Emmanuel I. Unuabonah
- African
Centre of Excellence for Water and Environment Research (ACEWATER), Redeemer’s University, PMB 230 Ede, Osun State 232101, Nigeria
- Department
of Chemical Sciences, Redeemer’s
University, PMB 230 Ede, Osun State 232101, Nigeria
| | - Andreas Taubert
- Institute
of Chemistry, University of Potsdam, D-14476 Potsdam, Germany
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Mendis A, Thambiliyagodage C, Ekanayake G, Liyanaarachchi H, Jayanetti M, Vigneswaran S. Fabrication of Naturally Derived Chitosan and Ilmenite Sand-Based TiO2/Fe2O3/Fe-N-Doped Graphitic Carbon Composite for Photocatalytic Degradation of Methylene Blue under Sunlight. Molecules 2023; 28:molecules28073154. [PMID: 37049917 PMCID: PMC10096480 DOI: 10.3390/molecules28073154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 03/29/2023] [Accepted: 03/30/2023] [Indexed: 04/05/2023] Open
Abstract
Fabrication of chitosan and ilmenite sand-based novel photocatalysts through the catalytic graphitization of chitosan is reported. Nanocomposites consisted of TiO2, Fe2O3 and Fe nanoparticles dispersed on a nitrogen-doped graphitic carbon framework. The surface area, pore volume and macropore structure of the carbon matrix is disturbed by the heterogeneously distributed nanoparticles. The extent of graphitization expanded with increasing metal loading as indicated by variation in the ID/IG ratio. The nanomaterial’s surface consists of Fe3+ and Ti4+, and graphitic, pyridinic and pyrrolic nitrogen were found in the carbon matrix. The band gap values of the composites varied in the 2.06–2.26 eV range. The photocatalytic activity of the synthesized nanomaterials was determined, and the highest rate constant for the photodegradation of methylene blue under sunlight was 4.4 × 10−3 min−1, which resulted with 10 mg/L MB and 25 mg of the best-performing catalyst. The rate constant rose with increasing concentrations of persulfate added to the medium. The rate constant greatly diminished with the addition of isopropyl alcohol as it scavenged hydroxyl radicals. The presence of co-pollutants including Pb2+, rhodamine B, PO43− and Cl− curtailed the rate of reaction. The activity reduced with an increasing number of uses of the catalyst.
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Affiliation(s)
- Amavin Mendis
- Faculty of Humanities and Sciences, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
| | - Charitha Thambiliyagodage
- Faculty of Humanities and Sciences, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
| | - Geethma Ekanayake
- Faculty of Humanities and Sciences, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
| | - Heshan Liyanaarachchi
- Faculty of Humanities and Sciences, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
| | - Madara Jayanetti
- Faculty of Humanities and Sciences, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
| | - Saravanamuthu Vigneswaran
- Faculty of Engineering and Information Technology, University of Technology Sydney, P.O. Box 123, Sydney, NSW 2007, Australia
- Faculty of Sciences & Technology (RealTek), Norwegian University of Life Sciences, P.O. Box N-1432 Ås, Norway
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Gervasi S, Blangetti N, Freyria FS, Guastella S, Bonelli B. Undoped and Fe-Doped Anatase/Brookite TiO2 Mixed Phases, Obtained by a Simple Template-Free Synthesis Method: Physico-Chemical Characterization and Photocatalytic Activity towards Simazine Degradation. Catalysts 2023. [DOI: 10.3390/catal13040667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
For the first time, Fe-doping (0.05, 1.0, and 2.5 wt.% Fe) was performed on a high-surface-area anatase/brookite TiO2 by adopting a simple template-free sol-gel synthesis followed by calcination at a mild temperature. The powders’ textural and surface properties were characterized by following a multi-technique approach. XRD analysis showed that the anatase/brookite ratio slightly varied in the Fe-doped TiO2 (from 76.9/23.1 to 79.3/22.7); Fe doping noticeably affected the cell volume of the brookite phase, which decreased, likely due to Fe3+ ions occupying interstitial positions, and retarded the crystallite growth. N2 sorption at −196 °C showed the occurrence of samples with disordered interparticle mesopores, with an increase in the specific surface area from 236 m2 g−1 (undoped TiO2) to 263 m2 g−1 (2.5 wt.% Fe). Diffuse Reflectance UV-Vis spectroscopy showed a progressive decrease in the bandgap energy from 3.10 eV (undoped TiO2) to 2.85 eV (2.5 wt.% Fe). XPS analysis showed the presence of some surface Fe species only at 2.5 wt.% Fe, and accordingly, the ζ-potential measurements showed small changes in the pH at the isoelectric point. The photocatalytic degradation of simazine (a persistent water contaminant) both under UV and simulated solar light was performed as a probe reaction. Under UV light, Fe-doping improved simazine degradation in the sample at 0.05 wt.% Fe, capable of degrading ca. 77% simazine. Interestingly, the undoped TiO2 was also active both under UV and 1 SUN. This is likely due to the occurrence of anatase/brookite heterojunctions, which help stabilize the photogenerated electrons/holes.
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Eddy DR, Permana MD, Sakti LK, Sheha GAN, Solihudin, Hidayat S, Takei T, Kumada N, Rahayu I. Heterophase Polymorph of TiO 2 (Anatase, Rutile, Brookite, TiO 2 (B)) for Efficient Photocatalyst: Fabrication and Activity. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:704. [PMID: 36839072 PMCID: PMC9965282 DOI: 10.3390/nano13040704] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 07/30/2023]
Abstract
TiO2 exists naturally in three crystalline forms: Anatase, rutile, brookite, and TiO2 (B). These polymorphs exhibit different properties and consequently different photocatalytic performances. This paper aims to clarify the differences between titanium dioxide polymorphs, and the differences in homophase, biphase, and triphase properties in various photocatalytic applications. However, homophase TiO2 has various disadvantages such as high recombination rates and low adsorption capacity. Meanwhile, TiO2 heterophase can effectively stimulate electron transfer from one phase to another causing superior photocatalytic performance. Various studies have reported the biphase of polymorph TiO2 such as anatase/rutile, anatase/brookite, rutile/brookite, and anatase/TiO2 (B). In addition, this paper also presents the triphase of the TiO2 polymorph. This review is mainly focused on information regarding the heterophase of the TiO2 polymorph, fabrication of heterophase synthesis, and its application as a photocatalyst.
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Affiliation(s)
- Diana Rakhmawaty Eddy
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Muhamad Diki Permana
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
- Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of Yamanashi, Kofu 400-8511, Japan
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Lintang Kumoro Sakti
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Geometry Amal Nur Sheha
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Solihudin
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Sahrul Hidayat
- Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Iman Rahayu
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
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9
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Effect of Calcination Temperature of SiO2/TiO2 Photocatalysts on UV-VIS and VIS Removal Efficiency of Color Contaminants. Catalysts 2023. [DOI: 10.3390/catal13010186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
This paper presents the effect of fumed silica modification and calcination temperature on the physicochemical properties of photocatalysts and their activity under the UV-VIS and VIS light range. The materials were obtained by hydrolysis of titanium tetraisopropoxide (TTIP) combined with a calcination step. The obtained nanomaterials were characterized using analytical methods such as X-ray diffraction XRD, FT-IR/DRS infrared spectroscopy, UV-Vis/DRS spectroscopy and SEM scanning electron microscopy. BET specific surface area and zeta potential were also measured. It was observed that SiO2 modification inhibited the transformation phase of anatase to rutile and the increase in crystallite size during calcination. The calcination process contributed to a change in the surface character of photocatalysts under study from positively to negatively charged. The photocatalytic activity of samples was identified by determining the methylene blue decomposition under UV-VIS and VIS light. Experimental results showed that the addition of SiO2 and the calcination process increased the photoactivity. The obtained materials showed higher activity compared to the reference samples. It was found that the degree of dye removal increased along with increased calcination temperature. The highest activity was observed for photocatalyst SiO2(11.1%)/TiO2_600.
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10
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Ultrasonic-Assisted Synthesis of α-Fe2O3@TiO2 Photocatalyst: Optimization of Effective Factors in the Fabrication of Photocatalyst and Removal of Non-biodegradable Cefixime via Response Surface Methodology-Central Composite Design. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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11
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Haruna A, Chong FK, Ho YC, Merican ZMA. Preparation and modification methods of defective titanium dioxide-based nanoparticles for photocatalytic wastewater treatment-a comprehensive review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:70706-70745. [PMID: 36044146 DOI: 10.1007/s11356-022-22749-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
The rapid population growth and industrial expansion worldwide have created serious water contamination concerns. To curb the pollution issue, it has become imperative to use a versatile material for the treatment. Titanium dioxide (TiO2) has been recognized as the most-studied nanoparticle in various fields of science and engineering due to its availability, low cost, efficiency, and other fascinating properties with a wide range of applications in modern technology. Recent studies revealed the photocatalytic activity of the material for the treatment of industrial effluents to promote environmental sustainability. With the wide band gap energy of 3.2 eV, TiO2 can be activated under UV light; thus, many strategies have been proposed to extend its photoabsorption to the visible light region. In what follows, this has generated increasing attention to study its characteristics and structural modifications in different forms for photocatalytic applications. The present review provides an insight into the understanding of the synthesis methods of TiO2, the current progress in the treatment techniques for the degradation of wide environmental pollutants employing modified TiO2 nanoparticles, and the factors affecting its photocatalytic activities. Further, recent developments in using titania for practical applications, the approach for designing novel nanomaterials, and the prospects and opportunities in this exciting area have been discussed.
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Affiliation(s)
- Abdurrashid Haruna
- Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia.
- Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria.
- Centre of Innovative Nanostructures & Nanodevices (COINN), Institute of Autonomous System, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia.
| | - Fai-Kait Chong
- Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
- Centre of Innovative Nanostructures & Nanodevices (COINN), Institute of Autonomous System, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia
| | - Yeek-Chia Ho
- Civil and Environmental Engineering Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
- Centre for Urban Resource Sustainability, Institute for Self-Sustainable Building, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
| | - Zulkifli Merican Aljunid Merican
- Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
- Institute of Contaminant Management for Oil & Gas, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
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12
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Co, Cu, Fe, and Ni Deposited over TiO2 and Their Photocatalytic Activity in the Degradation of 2,4-Dichlorophenol and 2,4-Dichlorophenoxyacetic Acid. INORGANICS 2022. [DOI: 10.3390/inorganics10100157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Pure TiO2 synthesized by the sol-gel method and subsequently deposited at 5% by weight with Co, Cu, Fe, and Ni ions by the deposition–precipitation method were studied as photocatalysts. The nanomaterials were analyzed by SEM, TEM, UV-Vis DRS, DRX, Physisorption N2, and XPS. The SEM and TEM images present a semi-spherical shape with small agglomerations of particles and average size between 63 and 65 nm. UV-Vis results show that a reduction below 3.2 eV exhibits a redshift displacement and increment in the optical absorption of the nanoparticles promoting the absorption in the UV-visible region. XRD spectra and analysis SAED suggest the characteristic anatase phase in TiO2 and deposited materials according to JCPDS 21-1272. The specific surface area was calculated and the nanomaterial Ni/TiO2 (21.3 m2 g−1) presents a slight increment when comparing to TiO2 (20.37 m2g−1). The information generated by the XPS spectra present the deposition of metallic ions on the support and the presence of different valence states for each photocatalyst. The photocatalytic activity was carried out in an aqueous solution with 80 mg L−1 of 2,4-D or 2,4-DCP under UV light (285 nm) with 100 mg L−1 of each photocatalysts for 360 min. The nanomaterial that presented the best efficiency was Ni/TiO2, obtaining a degradation of 85.6% and 90.3% for 2,4-D and 2,4-DCP, respectively. Similarly, this material was the one that presented the highest mineralization, 68.3% and 86.5% for 2,4-D and 2,4-DCP, respectively. Photocatalytic reactions correspond to the pseudo-first-order Langmuir–Hinshelwood model.
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13
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Sharma S, Shree B, Sharma A, Irfan M, Kumar P. Nanoparticle-based toxicity in perishable vegetable crops: Molecular insights, impact on human health and mitigation strategies for sustainable cultivation. ENVIRONMENTAL RESEARCH 2022; 212:113168. [PMID: 35346658 DOI: 10.1016/j.envres.2022.113168] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 02/08/2022] [Accepted: 03/16/2022] [Indexed: 05/27/2023]
Abstract
With the advancement of nanotechnology, the use of nanoparticles (NPs) and nanomaterials (NMs) in agriculture including perishable vegetable crops cultivation has been increased significantly. NPs/NMs positively affect plant growth and development, seed germination, plant stress management, and postharvest handling of fruits and vegetables. However, these NPs sometimes cause toxicity in plants by oxidative stress and excess reactive oxygen species production that affect cellular biomolecules resulting in imbalanced biological and metabolic processes in plants. Therefore, information about the mechanism underlying interactions of NPs with plants is important for the understanding of various physiological and biochemical responses of plants, evaluating phytotoxicity, and developing mitigation strategies for vegetable crops cultivation. To address this, recent morpho-physiological, biochemical and molecular insights of nanotoxicity in the vegetable crops have been discussed in this review. Further, factors affecting the nanotoxicity in vegetables and mitigation strategies for sustainable cultivation have been reviewed. Moreover, the bioaccumulation and biomagnification of NPs and associated phytotoxicity can cause serious effects on human health which has also been summarized. The review also highlights the use of advanced omics approaches and interdisciplinary tools for understanding the nanotoxicity and their possible use for mitigating phytotoxicity.
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Affiliation(s)
- Shweta Sharma
- MS Swaminathan School of Agriculture, Shoolini University of Biotechnology and Management Sciences, Solan, 173229, HP, India
| | - Bharti Shree
- Department of Agricultural Biotechnology, CSK HPKV, Palampur, 176062, HP, India
| | - Ajit Sharma
- Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, 173230, HP, India
| | - Mohammad Irfan
- Plant Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA.
| | - Pankaj Kumar
- Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, 173230, HP, India.
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14
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Synergistic Correlation in the Colloidal Properties of TiO2 Nanoparticles and Its Impact on the Photocatalytic Activity. INORGANICS 2022. [DOI: 10.3390/inorganics10090125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In this work, the relationship between the photodegradation rate of methylene blue (MB) and the effective surface charge of titania nanoparticles (TiO2 NPs) in an aqueous solution is addressed. Colloidal dispersions were prepared from TiO2 NPs (4–10 nm) for the heterogenous photocatalysis test. The dispersion properties such as pH, hydrodynamic diameter, zeta potential, and isoelectric point were studied. Acidic TiO2 dispersions (pH = 3.6–4.0) with a positive zeta potential and smaller hydrodynamic diameter exhibit larger colloidal stability and pseudo-first-order kinetics for the degradation of MB. The largest rate constant (5 × 10−2 min−1) corresponded to a conversion of 98% within 75 min under UV light. This enhanced rate is a synergic effect between the surface area, charge, and optimal hydrodynamic diameter of TiO2 NPs. A linear correlation between the calculated values for the absorption cross-section and normalized rate constant was found for the systems under study. It was observed that an eventual increase in the pH (4–5.5) reduces the effective surface charge and dispersion stability, causing a decrease in the rate constants of one order of magnitude (10−3 min−1) for TiO2 agglomerates with a larger hydrodynamic diameter (300–850 nm).
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15
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Thambiliyagodage C, Usgodaarachchi L, Jayanetti M, Liyanaarachchi C, Kandanapitiye M, Vigneswaran S. Efficient Visible-Light Photocatalysis and Antibacterial Activity of TiO 2-Fe 3C-Fe-Fe 3O 4/Graphitic Carbon Composites Fabricated by Catalytic Graphitization of Sucrose Using Natural Ilmenite. ACS OMEGA 2022; 7:25403-25421. [PMID: 35910103 PMCID: PMC9330088 DOI: 10.1021/acsomega.2c02336] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 07/06/2022] [Indexed: 05/27/2023]
Abstract
Dyes in wastewater are a serious problem that needs to be resolved. Adsorption coupled photocatalysis is an innovative technique used to remove dyes from contaminated water. Novel composites of TiO2-Fe3C-Fe-Fe3O4 dispersed on graphitic carbon were fabricated using natural ilmenite sand as the source of iron and titanium, and sucrose as the carbon source, which were available at no cost. Synthesized composites were characterized by X-ray diffractometry (XRD), Raman spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF), and diffuse reflectance UV-visible spectroscopy (DRS). Arrangement of nanoribbons of graphitic carbon with respect to the nanomaterials was observed in TEM images, revealing the occurrence of catalytic graphitization. Variations in the intensity ratio (I D/I G), L a and L D, calculated from data obtained from Raman spectroscopy suggested that the level of graphitization increased with an increased loading of the catalysts. SEM images show the immobilization of nanoplate microballs and nanoparticles on the graphitic carbon matrix. The catalyst surface consists of Fe3+ and Ti4+ as the metal species, with V, Mn, and Zr being the main impurities. According to DRS spectra, the synthesized composites absorb light in the visible region efficiently. Fabricated composites effectively adsorb methylene blue via π-π interactions, with the absorption capacities ranging from 21.18 to 45.87 mg/g. They were effective in photodegrading methylene blue under sunlight, where the rate constants varied in the 0.003-0.007 min-1 range. Photogenerated electrons produced by photocatalysts captured by graphitic carbon produce O2 •- radicals, while holes generate OH• radicals, which effectively degrade methylene blue molecules. TiO2-Fe3C-Fe-Fe3O4/graphitic carbon composites inhibited the growth of Escherichia coli (69%) and Staphylococcus aureus (92%) under visible light. Synthesized novel composites using natural materials comprise an ecofriendly, cost-effective solution to remove dyes, and they were effective in inhibiting the growth of Gram-negative and Gram-positive bacteria.
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Affiliation(s)
- Charitha Thambiliyagodage
- Faculty
of Humanities and Sciences, Sri Lanka Institute
of Information Technology, Malabe 10115, Sri Lanka
| | - Leshan Usgodaarachchi
- Department
of Materials Engineering, Faculty of Engineering, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
| | - Madara Jayanetti
- Faculty
of Humanities and Sciences, Sri Lanka Institute
of Information Technology, Malabe 10115, Sri Lanka
| | - Chamika Liyanaarachchi
- Faculty
of Humanities and Sciences, Sri Lanka Institute
of Information Technology, Malabe 10115, Sri Lanka
| | - Murthi Kandanapitiye
- Department
of Nano Science Technology, Wayamba University
of Sri Lanka, Kuliyapitiya 60200, Sri Lanka
| | - Saravanamuthu Vigneswaran
- Faculty
of Engineering, University of Technology
Sydney (UTS), P.O. Box 123, Broadway, NSW 2127, Australia
- Faculty
of Sciences & Technology (RealTek), Norwegian University of Life Sciences, P.O. Box N-1432, Ås 1430, Norway
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16
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Sedghi M, Hosseini-Kharat M, Rahimi R, Rabbani M. New composites based on aluminum alloy 5083 (TiO 2(x)/AA): investigation of plasmonic effect, semiconductor thickness, and calcination temperature on photodegradation process. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2022.2087678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Mahdi Sedghi
- Department of Chemistry, Iran University of Science and Technology, Tehran, Iran
| | - M Hosseini-Kharat
- UniSA Clinical & Health Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Rahmatollah Rahimi
- Department of Chemistry, Iran University of Science and Technology, Tehran, Iran
| | - Mahboubeh Rabbani
- Department of Chemistry, Iran University of Science and Technology, Tehran, Iran
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17
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Zhu X, Qin F, Xia Y, Yang D, Feng W, Jiao Y. Three-Phase Mixed Titania Powder Modified by Silver and Silver Chloride with Enhanced Photocatalytic Activity under UV-Visible Light. NANOMATERIALS 2022; 12:nano12091599. [PMID: 35564308 PMCID: PMC9100623 DOI: 10.3390/nano12091599] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/04/2022] [Accepted: 05/06/2022] [Indexed: 12/10/2022]
Abstract
Pure and Ag/AgCl-modified titania powders with anatase/rutile/brookite three-phase mixed structure were prepared by one-step hydrothermal method. The effects of Ag/Ti atomic percentages on the structure and photocatalytic performance of TiO2 were investigated. The results showed that pure TiO2 consisted of three phases, anatase, rutile, and brookite, and that Ag addition promoted the transformation from anatase to rutile. When the molar ratio of Ag/Ti reached 4%, the AgCl phase appeared. The addition of Ag had little effect on the optical absorption of TiO2; however, it did favor the separation of photogenerated electrons and holes. The results of photocatalytic experiments showed that after Ag addition, the degradation degree of rhodamine B (RhB) was enhanced. When the molar ratio of Ag/Ti was 4%, Ag/AgCl-modified TiO2 exhibited the highest activity, and the first-order reaction rate constant was 1.67 times higher than that of pure TiO2.
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Affiliation(s)
- Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (Y.X.); (D.Y.)
| | - Fengqiu Qin
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (Y.X.); (D.Y.)
| | - Yangwen Xia
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (Y.X.); (D.Y.)
| | - Daixiong Yang
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (Y.X.); (D.Y.)
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; (X.Z.); (F.Q.); (Y.X.); (D.Y.)
- Correspondence: (W.F.); (Y.J.)
| | - Yu Jiao
- School of Science, Xichang University, Xichang 615000, China
- Correspondence: (W.F.); (Y.J.)
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18
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Sun M, Zhou H, Xiong H, Zhang R, Liu Z, Li D, Gao B, Qiao ZA. Acid-regulated hydrolysis and condensation of titanium cation toward controllable synthesis of multiphase mesoporous TiO2 for effectively enhance photocatalytic H2 evolution. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.05.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Manzoli M, Freyria FS, Blangetti N, Bonelli B. Brookite, a sometimes under evaluated TiO2 polymorph. RSC Adv 2022. [DOI: 10.1039/d1ra09057g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Brookite positively affects solar photocatalysis, electrocatalysis and electrochemical applications by stabilizing photogenerated e−/h+ pairs. Brookite-related heterojunctions, cus Ti atoms, surface acidity and redox behaviour are crucial aspects.
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Affiliation(s)
- Maela Manzoli
- Dipartimento di Scienza e Tecnologia del Farmaco, NIS – Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, I-10125 Torino, Italy
| | - Francesca S. Freyria
- Dipartimento di Scienza Applicata e Tecnologia and INSTM Unit of Torino – Politecnico, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy
| | - Nicola Blangetti
- Dipartimento di Scienza Applicata e Tecnologia and INSTM Unit of Torino – Politecnico, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy
| | - Barbara Bonelli
- Dipartimento di Scienza Applicata e Tecnologia and INSTM Unit of Torino – Politecnico, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy
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20
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Liu W, Wang B, Zhang M. Effect of Process Parameters on the Microstructure and Performance of TiO 2-Loaded Activated Carbon. ACS OMEGA 2021; 6:35076-35092. [PMID: 34963989 PMCID: PMC8697605 DOI: 10.1021/acsomega.1c05833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 12/01/2021] [Indexed: 05/07/2023]
Abstract
In this study, the visible-light-driven photocatalytic regeneration performance of TiO2-loaded activated carbon (TiO2/AC) was effectively improved. By carefully controlling the activation condition at 700 °C for 2 h with a 60% H3PO4 concentration and 3:1 TBT (tetrabutyl titanate) impregnation ratio, 90.5% of methylene blue (50 mg/L) was removed within 2 h by a low-dose TiO2/AC (0.5 g/L), which was much higher than those obtained in previous studies on TiO2/AC. Moreover, the effects of process variables on the microstructure and performance of TiO2/AC were systematically investigated. The results showed that (1) the long period of activation time effectively inhibited the photogenerated charge carrier recombination and enhanced the regeneration performance of samples; (2) the photogenerated charge carrier recombination rate was lowered initially and then increased as the temperature ascended, whereas the pore volume showed an opposite variation tendency, and thus the adsorption and regeneration performances of samples were improved at 500-700 °C and then weakened at 800 °C; (3) the increase of H3PO4 concentration effectively inhibited the charge carrier recombination and had an improvement in the adsorption and regeneration performances of samples; and (4) the photogenerated charge carrier recombination rate and bandgap value of samples decreased initially and then increased with increasing TBT mass ratio, so the regeneration performances of samples were improved initially and then lowered.
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Affiliation(s)
- Wenjing Liu
- College
of Materials Science and Art Design, Inner
Mongolia Agricultural University, Hohhot 010018, China
| | - Bin Wang
- College
of Materials Science and Art Design, Inner
Mongolia Agricultural University, Hohhot 010018, China
| | - Minghui Zhang
- College
of Materials Science and Art Design, Inner
Mongolia Agricultural University, Hohhot 010018, China
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21
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Dontsova T, Kutuzova A, Hosseini-Bandegharaei A. Characterization and Properties of Titanium(IV) Oxide, Synthesized by Different Routes. CHEMISTRY & CHEMICAL TECHNOLOGY 2021. [DOI: 10.23939/chcht15.04.465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The article considers the influence of precursor type and sol-gel synthesis conditions of TiO2 on its properties. The obtained TiO2 samples were characterized by X-ray diffraction methods, electron microscopy, as a result of which it was found that all the obtained TiO2 powders have the crystallite size in a nanorange of 2.5–17 nm. It was shown that sorption-photocatalytic properties of TiO2 significantly depend on a phase composition, surface acidity, specific surface area and porosity. It was found that the amorphous TiO2 has improved adsorption properties, while crystalline TiO2 is characterized by enhanced photocatalytic properties. Determined acidic nature of the TiO2 surface explains the better sorption and photocatalysis relative to the cationic dye.
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22
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Freire T, Fragoso AR, Matias M, Pinto JV, Marques AC, Pimentel A, Barquinha P, Huertas R, Fortunato E, Martins R, Nunes D. Enhanced solar photocatalysis of TiO2 nanoparticles and nanostructured thin films grown on paper. NANO EXPRESS 2021. [DOI: 10.1088/2632-959x/abed40] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Titanium dioxide nanoparticles and nanostructured thin films were simultaneously synthesized using a microwave-assisted hydrothermal method. The synthesis formed very fine particles, appearing as nanospheres in the 11 nm size range. As for the nanostructured films, they have displayed similar structural characteristics to the nanoparticles, with thickness of 130 nm. These films covered uniformly and homogenously the Whatman paper, while maintaining its flexibility. The materials processed had their photocatalytic activity assessed from rhodamine B degradation under solar radiation (91% degradation after 40 min for the powder material and 68% after 6 h for the nanostructured thin films). Reusability experiments were also carried out, revealing superior performance concerning the Degussa P25, the most common photocatalyst used. The results of the present work can be thought as an option for the existing photocatalysts activated under solar light, namely for water purification, as it simultaneously produces enhanced photocatalytic powders and photocatalytic papers fully disposable and that can be easily recycled.
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23
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Hallam L, Papasergio AE, Lessio M, Veliscek-Carolan J. Phosphate functionalised titania for heavy metal removal from acidic sulfate solutions. J Colloid Interface Sci 2021; 600:719-728. [PMID: 34049027 DOI: 10.1016/j.jcis.2021.05.047] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 04/29/2021] [Accepted: 05/08/2021] [Indexed: 02/04/2023]
Abstract
Adsorbent materials based on titania and phosphate are ideal for treatment of solutions contaminated with heavy metals under acidic conditions, due to their inherent chemical stability and low pKa. Herein, phosphate functionalised titania has been investigated for the first time for removal of heavy metals (Cr, Fe, Cu, Eu, U) under conditions relevant to acid mine drainage (pH 2-5 sulfuric acid). Successful functionalisation was found to depend on the phase of titania used, with anatase preferred according to computational results from density functional theory. The effect of phosphate ligand structure was explored, revealing that the phosphate ethyl ester maximised heavy metal removal. The presence and concentration of counterions (sulfate, nitrate, ammonium) also impacted the speciation and binding of heavy metal cations, demonstrating the importance of adsorbent testing under realistic conditions. Increasing the porosity of the titania framework enhanced heavy metal removal, while maintaining selectivity for the toxic heavy metals over non-toxic cations Na and K. As such, phosphate functionalised titania shows great promise for heavy metal remediation in acidic sulfate environments.
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Affiliation(s)
- Laura Hallam
- ANSTO, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Antonia E Papasergio
- School of Chemistry, University of New South Wales, Kensington, NSW 2052, Australia
| | - Martina Lessio
- School of Chemistry, University of New South Wales, Kensington, NSW 2052, Australia
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24
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Eco-Friendly Colloidal Aqueous Sol-Gel Process for TiO2 Synthesis: The Peptization Method to Obtain Crystalline and Photoactive Materials at Low Temperature. Catalysts 2021. [DOI: 10.3390/catal11070768] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
This work reviews an eco-friendly process for producing TiO2 via colloidal aqueous sol–gel synthesis, resulting in crystalline materials without a calcination step. Three types of colloidal aqueous TiO2 are reviewed: the as-synthesized type obtained directly after synthesis, without any specific treatment; the calcined, obtained after a subsequent calcination step; and the hydrothermal, obtained after a specific autoclave treatment. This eco-friendly process is based on the hydrolysis of a Ti precursor in excess of water, followed by the peptization of the precipitated TiO2. Compared to classical TiO2 synthesis, this method results in crystalline TiO2 nanoparticles without any thermal treatment and uses only small amounts of organic chemicals. Depending on the synthesis parameters, the three crystalline phases of TiO2 (anatase, brookite, and rutile) can be obtained. The morphology of the nanoparticles can also be tailored by the synthesis parameters. The most important parameter is the peptizing agent. Indeed, depending on its acidic or basic character and also on its amount, it can modulate the crystallinity and morphology of TiO2. Colloidal aqueous TiO2 photocatalysts are mainly being used in various photocatalytic reactions for organic pollutant degradation. The as-synthesized materials seem to have equivalent photocatalytic efficiency to the photocatalysts post-treated with thermal treatments and the commercial Evonik Aeroxide P25, which is produced by a high-temperature process. Indeed, as-prepared, the TiO2 photocatalysts present a high specific surface area and crystalline phases. Emerging applications are also referenced, such as elaborating catalysts for fuel cells, nanocomposite drug delivery systems, or the inkjet printing of microstructures. Only a few works have explored these new properties, giving a lot of potential avenues for studying this eco-friendly TiO2 synthesis method for innovative implementations.
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Roy K, Debnath SC, Basu D, Pongwisuthiruchte A, Potiyaraj P. EMERGING ADVANCES IN RUBBER TECHNOLOGY BY THE SUITABLE APPLICATION OF SOL-GEL SCIENCE AND TECHNOLOGY. RUBBER CHEMISTRY AND TECHNOLOGY 2021. [DOI: 10.5254/rct.21.79955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
In recent years, the application of sol-gel science to industrial polymer research has offered advancements in rubber technology. The use of sol-gel–synthesized materials for the development of highly reinforced rubber composites is the most commonly adopted and popular method exercised by rubber scientists. This article comprehensively reviews the recent progress regarding preparation and properties of sol-gel–synthesized nanoparticles-based rubber composites. The pragmatic consequences of sol-gel–synthesized nanoparticles in rubber compounds are systematically described through rheological, mechanical, and thermal properties. Emphatic focus is given to understanding the reinforcement mechanism of rubber composites by the use of sol-gel–derived alkoxide silica as filler. The properties of rubber nanocomposites are usually dependent on the dispersion of sol-gel–synthesized nanoparticles into the rubber matrix. The results reviewed from prolific studies suggested that sol-gel science has tremendous potential to develop high performance rubber nanocomposites for future industrial application.
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Affiliation(s)
- Kumarjyoti Roy
- Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand
| | | | - Debdipta Basu
- Indian Rubber Manufacturers Research Association, Thane, Maharashtra 400604 India
| | - Aphiwat Pongwisuthiruchte
- Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand
- Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330 Thailand
| | - Pranut Potiyaraj
- Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand
- Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330 Thailand
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Muthee DK, Dejene BF. Effect of annealing temperature on structural, optical, and photocatalytic properties of titanium dioxide nanoparticles. Heliyon 2021; 7:e07269. [PMID: 34189312 PMCID: PMC8220335 DOI: 10.1016/j.heliyon.2021.e07269] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 01/04/2021] [Accepted: 06/07/2021] [Indexed: 11/28/2022] Open
Abstract
Titanium dioxide (TiO2) nanoparticles (NPs) were produced by simple sol-gel technique and annealed for 2 h in air. The impact of annealing temperature on the physical, morphological, photocatalytic, and optical properties was studied. X-ray diffraction (XRD) measurements proved that a gradual phase change from anatase to rutile occurred with increased annealing temperature. The crystal structures of the NPs were found to change at different temperatures; anatase phase at 450 °C, mixed-phase (anatase/Rutile) at 550–650 °C, and rutile phase at 750 °C. The rise in the annealing temperature improved the crystallinity of the NPs. The crystal and grain size of the NPs increased with the annealing temperature hence reducing the specific surface area due to the condensed boundaries between subunits of the NPs. As per the Kubelka-Munk equation, the bandgap reduced as the temperature elevated. The photocatalytic activity of the NPs was higher in the anatase/rutile mixed-phase than in the single anatase and rutile phase. Experimental results indicated that annealing temperature could effectively change the properties of the TiO2 NPs.
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Affiliation(s)
- Dorah Kawira Muthee
- Department of Physics, University of the Free State (QwaQwa Campus), Private Bag, X13, Phuthaditjhaba, 9866, South Africa.,Machakos University, P.O box 136-90100, Machakos, Kenya
| | - Birhanu Francis Dejene
- Physics Department, Walter Sisulu University (Mthatha Campus), Private Bag X1, South Africa
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de Campos MBM, Cebim MA, Meirelles MR, Paris EC, Rosa AH. Influence of terbium (III) ions on the photocatalytic activity of TiO 2 and CeO 2 for the degradation of methylene blue in industrial effluents. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:27147-27161. [PMID: 33502707 DOI: 10.1007/s11356-021-12571-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 01/15/2021] [Indexed: 06/12/2023]
Abstract
This study reports the preparation of TiO2 and CeO2 doped with different quantities of terbium and discusses the influence of this dopant on the photocatalytic activity of the semiconductors, with respect to the degradation of methylene blue, under ultraviolet and solar radiations. The oxides obtained were characterized by X-ray diffraction, infrared vibrational spectroscopy, diffuse reflectance spectroscopy, scanning electron microscopy, and dispersive energy spectroscopy. The results indicate that the presence of the dopant in TiO2 favored the formation of the anatase crystalline phase to the detriment of rutile, increased the band gap energy, and decreased the size of the nanoparticles. Doping CeO2 with Tb resulted in a fluorite-type crystalline structure, reduced band gap, and smaller particle size. The photocatalytic activity decreases as the concentration of terbium increases regardless of the radiation source and nature of the oxide. Furthermore, a better performance was observed for all semiconductors excited by solar radiation in comparison to ultraviolet light. The samples of pure TiO2 and TiO2 doped with 0.5 and 1% terbium showed total removal of the dye after less than 120 min of reaction, while the samples of pure CeO2 and CeO2 doped with 0.5% terbium showed approximately 80% and 57% of dye removal after 120 min, suggesting that these materials can be promising for the treatment of industrial effluents.
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Affiliation(s)
- Mariana Bizari Machado de Campos
- Sao Paulo State University (Unesp), Institute of Science and Technology, Sorocaba, 511 Três de Março Avenue, Sorocaba, SP, 18087-180, Brazil.
- Federal Institute of Education, Science and Technology of São Paulo (IFSP), Campus São Roque, 2100 Major Quintino de Lima Highway, São Roque, SP, 18145-090, Brazil.
| | - Marco Aurélio Cebim
- Sao Paulo State University (Unesp), Institute of Chemistry, Araraquara, 55 Prof. Francisco Degni Avenue, Araraquara, SP, 14800-900, Brazil
| | - Mariana Rodrigues Meirelles
- National Nanotechnology Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 1452 XV de Novembro Street, São Carlos, SP, 13560-970, Brazil
| | - Elaine Cristina Paris
- National Nanotechnology Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 1452 XV de Novembro Street, São Carlos, SP, 13560-970, Brazil
| | - André Henrique Rosa
- Sao Paulo State University (Unesp), Institute of Science and Technology, Sorocaba, 511 Três de Março Avenue, Sorocaba, SP, 18087-180, Brazil
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Ragesh Nath R, Nethravathi C, Rajamathi M. Hierarchically Porous, Biphasic, and C-Doped TiO 2 for Solar Photocatalytic Degradation of Dyes and Selective Oxidation of Benzyl Alcohol. ACS OMEGA 2021; 6:12124-12132. [PMID: 34056366 PMCID: PMC8154131 DOI: 10.1021/acsomega.1c00825] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
Macroporous TiO2 monoliths were synthesized by self-sustained combustion reactions of molded pellets made up of a mixture of TiCl4 as a precursor, urea as a fuel, ammonium nitrate as an oxidizer, and starch as a binder. The porous TiO2 monoliths were found to be a heterostructure of anatase and rutile phases, in addition to being doped with carbon. Variation in the amount of starch yielded porous monoliths of different anatase-rutile ratios (increasing rutile component from 0 to 40%) but comparable Brunauer-Emmett-Teller (BET) surface area (∼30 m2 g-1). The porous monoliths obtained, where the TiCl4/starch mass ratio was 2.17, exhibit exceptional photocatalytic activity in the degradation of dyes (methylene blue and methyl orange) and selective oxidation of benzyl alcohol to benzaldehyde under natural sunlight. The synergistic combination of high surface area, porous network, lowered band gap due to heterostructured anatase-rutile polymorphs, and the presence of doped carbon renders the macroporous TiO2 an efficient photocatalyst.
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Affiliation(s)
- R. Ragesh Nath
- Materials
Research Group, Department of Chemistry, St. Joseph’s College, 36 Lalbagh Road, Bangalore 560027, India
| | - C. Nethravathi
- Materials
Research Group, Department of Chemistry, St. Joseph’s College, 36 Lalbagh Road, Bangalore 560027, India
- Department
of Chemistry, Mount Carmel College, 58 Palace Road,
Vasanth Nagar, Bangalore 560052, India
| | - Michael Rajamathi
- Materials
Research Group, Department of Chemistry, St. Joseph’s College, 36 Lalbagh Road, Bangalore 560027, India
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29
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Jonnalagadda US, Su X, Kwan JJ. Nanostructured TiO 2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound. ULTRASONICS SONOCHEMISTRY 2021; 73:105530. [PMID: 33799108 PMCID: PMC8044705 DOI: 10.1016/j.ultsonch.2021.105530] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 03/06/2021] [Accepted: 03/12/2021] [Indexed: 05/08/2023]
Abstract
Current sonochemical methods rely on spatially uncontrolled cavitation for radical species generation to promote chemical reactions. To improve radical generation, sonosensitizers have been demonstrated to be activated by cavitation-based light emission (sonoluminescence). Unfortunately, this process remains relatively inefficient compared to direct photocatalysis, due to the physical separation between cavitation event and sonosensitizing agent. In this study, we have synthesized nanostructured titanium dioxide particles to couple the source for cavitation within a photocatalytic site to create a sonophotocatalyst. In doing so, we demonstrate that site-controlled cavitation from the nanoparticles using pulsed ultrasound at reduced acoustic powers resulted in the sonochemical degradation methylene blue at rates nearly three orders of magnitude faster than other titanium dioxide-based nanoparticles by conventional methods. Sonochemical degradation was directly proportional to the measured cavitation produced by these sonophotocatalysts. Our work suggests that simple nanostructuring of current sonosensitizers to enable on-site cavitation greatly enhances sonochemical reaction rates.
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Affiliation(s)
- U S Jonnalagadda
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459, Singapore
| | - X Su
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459, Singapore
| | - J J Kwan
- Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom.
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Kitagawa IL, Miyazaki CM, Pitol-Palin L, Okamoto R, de Vasconcellos LMR, Constantino CJL, Lisboa-Filho PN. Titanium-Based Alloy Surface Modification with TiO 2 and Poly(sodium 4-styrenesulfonate) Multilayers for Dental Implants. ACS APPLIED BIO MATERIALS 2021; 4:3055-3066. [PMID: 35014394 DOI: 10.1021/acsabm.0c01348] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Implant placement is an important repair method in dentistry and orthopedics. Increasing efforts have focused on optimizing the biocompatibility and osseointegration properties of titanium (Ti) and Ti-based alloys. In this work, Ti-based alloys were modified by the layer-by-layer (LbL) technique, which is a simple and versatile method for surface modification. The morphology and chemical structure of LbL films of poly(sodium 4-styrenesulfonate) (PSS) and Ti dioxide (TiO2) nanoparticles were first characterized employing ultraviolet-visible and Fourier-transform infrared spectroscopies as well as atomic force microscopy for further application in Ti-based alloy implants. The changes provoked by the LbL PSS/TiO2 film on the Ti-based alloy surfaces were then investigated by scanning electron microscopy and micro-Raman techniques. Finally, in vivo tests (immunolabeling and biomechanical analysis) performed with screw implants in rats suggested that PSS/TiO2 multilayers promote changes in both topography and chemical surface properties of the screw, providing beneficial effects for osteoblast activity. This simple and relatively low-cost growth process can open up possibilities to improve dental implants and, probably, bone implants in general.
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Affiliation(s)
- Igor L Kitagawa
- School of Sciences, Department of Physics, UNESP São Paulo State University, Bauru, São Paulo 17033-360, Brazil.,Science and Technology of São Paulo, IFSP Federal Institute of Education, Campus Birigui, Birigui, São Paulo 16201-407, Brazil
| | - Celina M Miyazaki
- CCTS, Federal University of São Carlos, Sorocaba, São Paulo 18052-780, Brazil
| | - Letícia Pitol-Palin
- Araçatuba Dental School, Department of Basic Science, UNESP São Paulo State University, Araçatuba 16018-805, Brazil
| | - Roberta Okamoto
- Araçatuba Dental School, Department of Basic Science, UNESP São Paulo State University, Araçatuba 16018-805, Brazil
| | - Luana M R de Vasconcellos
- Institute of Science and Technology, Department of Biosciences and Oral Diagnosis, UNESP São Paulo State University, São José dos Campos, São Paulo 12245-000, Brazil
| | - Carlos J L Constantino
- School of Technology and Applied Sciences, Department of Physics, UNESP São Paulo State University, Presidente Prudente, São Paulo 19060-900, Brazil
| | - Paulo N Lisboa-Filho
- School of Sciences, Department of Physics, UNESP São Paulo State University, Bauru, São Paulo 17033-360, Brazil
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31
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Abstract
The interest in advanced photocatalytic technologies with metal oxide-based nanomaterials has been growing exponentially over the years due to their green and sustainable characteristics. Photocatalysis has been employed in several applications ranging from the degradation of pollutants to water splitting, CO2 and N2 reductions, and microorganism inactivation. However, to maintain its eco-friendly aspect, new solutions must be identified to ensure sustainability. One alternative is creating an enhanced photocatalytic paper by introducing cellulose-based materials to the process. Paper can participate as a substrate for the metal oxides, but it can also form composites or membranes, and it adds a valuable contribution as it is environmentally friendly, low-cost, flexible, recyclable, lightweight, and earth abundant. In term of photocatalysts, the use of metal oxides is widely spread, mostly since these materials display enhanced photocatalytic activities, allied to their chemical stability, non-toxicity, and earth abundance, despite being inexpensive and compatible with low-cost wet-chemical synthesis routes. This manuscript extensively reviews the recent developments of using photocatalytic papers with nanostructured metal oxides for environmental remediation. It focuses on titanium dioxide (TiO2) and zinc oxide (ZnO) in the form of nanostructures or thin films. It discusses the main characteristics of metal oxides and correlates them to their photocatalytic activity. The role of cellulose-based materials on the systems’ photocatalytic performance is extensively discussed, and the future perspective for photocatalytic papers is highlighted.
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32
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Lettieri S, Pavone M, Fioravanti A, Santamaria Amato L, Maddalena P. Charge Carrier Processes and Optical Properties in TiO 2 and TiO 2-Based Heterojunction Photocatalysts: A Review. MATERIALS 2021; 14:ma14071645. [PMID: 33801646 PMCID: PMC8036967 DOI: 10.3390/ma14071645] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/19/2021] [Accepted: 03/23/2021] [Indexed: 02/07/2023]
Abstract
Photocatalysis based technologies have a key role in addressing important challenges of the ecological transition, such as environment remediation and conversion of renewable energies. Photocatalysts can in fact be used in hydrogen (H2) production (e.g., via water splitting or photo-reforming of organic substrates), CO2 reduction, pollution mitigation and water or air remediation via oxidation (photodegradation) of pollutants. Titanium dioxide (TiO2) is a “benchmark” photocatalyst, thanks to many favorable characteristics. We here review the basic knowledge on the charge carrier processes that define the optical and photophysical properties of intrinsic TiO2. We describe the main characteristics and advantages of TiO2 as photocatalyst, followed by a summary of historical facts about its application. Next, the dynamics of photogenerated electrons and holes is reviewed, including energy levels and trapping states, charge separation and charge recombination. A section on optical absorption and optical properties follows, including a discussion on TiO2 photoluminescence and on the effect of molecular oxygen (O2) on radiative recombination. We next summarize the elementary photocatalytic processes in aqueous solution, including the photogeneration of reactive oxygen species (ROS) and the hydrogen evolution reaction. We pinpoint the TiO2 limitations and possible ways to overcome them by discussing some of the “hottest” research trends toward solar hydrogen production, which are classified in two categories: (1) approaches based on the use of engineered TiO2 without any cocatalysts. Discussed topics are highly-reduced “black TiO2”, grey and colored TiO2, surface-engineered anatase nanocrystals; (2) strategies based on heterojunction photocatalysts, where TiO2 is electronically coupled with a different material acting as cocatalyst or as sensitizer. Examples discussed include TiO2 composites or heterostructures with metals (e.g., Pt-TiO2, Au-TiO2), with other metal oxides (e.g., Cu2O, NiO, etc.), direct Z-scheme heterojunctions with g-C3N4 (graphitic carbon nitride) and dye-sensitized TiO2.
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Affiliation(s)
- Stefano Lettieri
- Institute of Applied Sciences and Intelligent Systems “E. Caianiello”, Consiglio Nazionale delle Ricerche (CNR-ISASI), Complesso Universitario di Monte S. Angelo, Via Cupa Cintia 21, 80126 Napoli, Italy
- Correspondence: ; Tel.: +39-081676809
| | - Michele Pavone
- Department of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario di Monte S. Angelo, Via Cupa Cintia 21, 80126 Napoli, Italy;
| | - Ambra Fioravanti
- Institute of Science and Technology for Sustainable Energy and Mobility, Consiglio Nazionale delle Ricerche (CNR-STEMS), Via Canal Bianco 28, 44124 Ferrara, Italy;
| | | | - Pasqualino Maddalena
- Department of Physics “E. Pancini”, University of Naples “Federico II”, Complesso Universitario di Monte S. Angelo, Via Cupa Cintia 21, 80126 Napoli, Italy;
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Ermokhina NI, Shvalagin VV, Romanovska NI, Manoryk PA, Barakov RY, Kompanets MO, Sapsay VI, Klymchuk DO, Puziy AM. Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide. SN APPLIED SCIENCES 2021. [DOI: 10.1007/s42452-021-04474-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
AbstractDifferent phase compositions of mesoporous nanocrystalline TiO2 (meso-nc-TiO2), comprised of anatase (16–100%), rutile (0–70%) and brookite (0–52%) were obtained by sol–gel synthesis with or without hydrothermal treatment (HTT) by means of titanium tetrabutoxide and dibenzo-18-croun-6 as structure-forming agent in the presence of HCl. It was shown, that small amounts of surfactant and/or lanthanum salt as well as HTT determine phase composition and texture of meso-nc-TiO2. All samples were calcined at 500 оС and characterized by SEM, TEM, XRD and N2-adsorption/desorption isotherms. It has been established that photocatalytic properties of almost all obtained samples significantly exceed the photocatalytic activity of Evonik P-25 TiO2 in gas phase ethanol oxidation. The most active sample is characterized by phase composition of anatase (97%)-rutile (3%). It is obvious, that decrease of photocatalytic activity of sample was affected by decrease of anatase phase content. It was shown that the specific surface area of the sample is not a key factor affecting the activity of mixed-phase meso-nc-TiO2 samples in the process of ethanol oxidation.
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Esposito S, Ditaranto N, Dell’Agli G, Nasi R, Rivolo P, Bonelli B. Effective Inclusion of Sizable Amounts of Mo within TiO 2 Nanoparticles Can Be Obtained by Reverse Micelle Sol-Gel Synthesis. ACS OMEGA 2021; 6:5379-5388. [PMID: 33681577 PMCID: PMC7931434 DOI: 10.1021/acsomega.0c05552] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/27/2021] [Indexed: 05/02/2023]
Abstract
Six Mo/TiO2 samples (with 0, 1.0, 2.5, 5.0, 7.5, and 10 wt % Mo nominal contents) were obtained by reverse micelle sol-gel synthesis, followed by calcination at 500 °C. The samples were characterized by means of powder X-ray Diffraction (PXRD), quantitative phase analysis as obtained by Rietveld refinement, field-emission scanning electron microscopy (FE-SEM) coupled with energy-dispersive X-ray analysis, N2 adsorption/desorption at -196 °C, X-ray photoelectron spectroscopy, and diffuse reflectance (DR) UV-vis spectroscopy. As a whole, the adopted characterization techniques showed the inclusion of a sizeable Mo amount, without the segregation of any MoO x phase. Specifically, PXRD showed the occurrence of anatase and brookite with all the studied samples; notwithstanding the mild calcination temperature, the formation of rutile occurred at Mo wt % ≥2.5 likely due to the presence of brookite favoring, in turn, anatase to rutile transition. DR UV-vis and XP spectroscopies allowed determining the samples' band gap energy (E g) and valence band energy, respectively, from which the conduction band energy was calculated; and the observed E g value increase at 10 wt % Mo was ascribed to the Moss-Burstein effect.
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Affiliation(s)
- Serena Esposito
- Department
of Applied Science and Technology, Politecnico
di Torino, Corso Duca degli Abruzzi 24, Torino I-10129, Italy
- INSTM
Unit of Torino-Politecnico, Corso Duca degli Abruzzi 24, Torino I-10129, Italy
| | - Nicoletta Ditaranto
- Dipartimento
di Chimica, Università degli Studi
di Bari “Aldo Moro”, via Orabona 4, Bari 70125, Italy
| | - Gianfranco Dell’Agli
- Dipartimento
di Ingegneria Civile e Meccanica, Università
degli Studi di Cassino e del Lazio Meridionale, Via G. Di Blasio, 43, Cassino (FR) I-03043, Italy
| | - Roberto Nasi
- Department
of Applied Science and Technology, Politecnico
di Torino, Corso Duca degli Abruzzi 24, Torino I-10129, Italy
| | - Paola Rivolo
- Department
of Applied Science and Technology, Politecnico
di Torino, Corso Duca degli Abruzzi 24, Torino I-10129, Italy
| | - Barbara Bonelli
- Department
of Applied Science and Technology, Politecnico
di Torino, Corso Duca degli Abruzzi 24, Torino I-10129, Italy
- INSTM
Unit of Torino-Politecnico, Corso Duca degli Abruzzi 24, Torino I-10129, Italy
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Su R, Li S, Wu W, Song C, Liu G, Yu Y. Recent progress in electrospun nanofibrous membranes for oil/water separation. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117790] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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36
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Kingchok S, Nontasorn P, Laohhasurayotin K, Traiphol N, Traiphol R. Reversible thermochromic polydiacetylene/zinc-aluminium layered double hydroxides nanocomposites for smart paints and colorimetric sensors: The crucial role of zinc ions. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125733] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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37
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Abstract
Titanium oxide (TiO2) is a potential photocatalyst for removing toxic NOx from the atmosphere. Its practical application is, however, significantly limited by its low absorption into visible light and a high degree of charge recombination. The overall photocatalytic activity of TiO2 remains too low since it can utilize only about 4–5% of solar energy. Nitrogen doping into the TiO2 lattice takes advantage of utilizing a wide range of solar radiation by increasing the absorption capability towards the visible light region. In this work, N-doped TiO2, referred to as TC, was synthesized by a simple co-precipitation of tri-thiocyanuric acid (TCA) with P25 followed by heat treatment at 550 degrees C. The resulting nitrogen doping increased the visible-light absorption and enhanced the separation/transfer of photo-excited charge carriers by capturing holes by reduced titanium ions. As a result, TC samples exhibited excellent photocatalytic activities of 59% and 51% in NO oxidation under UV and visible light irradiation, in which the optimum mass ratio of TCA to P25 was found to be 10.
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Kim MG, Lee JE, Kim KS, Kang JM, Lee JH, Kim KH, Cho M, Lee SG. Photocatalytic degradation of methylene blue under UV and visible light by brookite–rutile bi-crystalline phase of TiO 2. NEW J CHEM 2021. [DOI: 10.1039/d0nj05162d] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Brookite–rutile bi-crystalline phase of TiO2 were synthesized and applied for the degradation of methylene blue under UV and visible light irradiation by photocatalytic reaction.
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Affiliation(s)
- Min Gu Kim
- School of Chemical Engineering
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Ji Eun Lee
- School of Chemical Engineering
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Kang Seok Kim
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Jeong Min Kang
- School of Chemical Engineering
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Jeong Hoon Lee
- Korea Institute of Convergence Textile
- Jeollabuk-do
- Republic of Korea
| | - Kwang Ho Kim
- School of Materials Science and Engineering
- Pusan National University
- Busan
- Republic of Korea
| | - Min Cho
- Division of Biotechnology
- Advanced institute of Environment and Bioscience
- College of Environmental and Bioresource Sciences
- Chonbuk National University
- Iksan 54596
| | - Seung Geol Lee
- School of Chemical Engineering
- Pusan National University
- Busan 46241
- Republic of Korea
- Department of Organic Material Science and Engineering
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Mutuma BK, Mathebula X, Nongwe I, Mtolo BP, Matsoso BJ, Erasmus R, Tetana Z, Coville NJ. Unravelling the interfacial interaction in mesoporous SiO 2@nickel phyllosilicate/TiO 2 core-shell nanostructures for photocatalytic activity. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2020; 11:1834-1846. [PMID: 33364142 PMCID: PMC7736695 DOI: 10.3762/bjnano.11.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
Core-shell based nanostructures are attractive candidates for photocatalysis owing to their tunable physicochemical properties, their interfacial contact effects, and their efficacy in charge-carrier separation. This study reports, for the first time, on the synthesis of mesoporous silica@nickel phyllosilicate/titania (mSiO2@NiPS/TiO2) core-shell nanostructures. The TEM results showed that the mSiO2@NiPS composite has a core-shell nanostructure with a unique flake-like shell morphology. XPS analysis revealed the successful formation of 1:1 nickel phyllosilicate on the SiO2 surface. The addition of TiO2 to the mSiO2@NiPS yielded the mSiO2@NiPS/TiO2 composite. The bandgap energy of mSiO2@NiPS and of mSiO2@NiPS/TiO2 were estimated to be 2.05 and 2.68 eV, respectively, indicating the role of titania in tuning the optoelectronic properties of the SiO2@nickel phyllosilicate. As a proof of concept, the core-shell nanostructures were used as photocatalysts for the degradation of methyl violet dye and the degradation efficiencies were found to be 72% and 99% for the mSiO2@NiPS and the mSiO2@NiPS/TiO2 nanostructures, respectively. Furthermore, a recyclability test revealed good stability and recyclability of the mSiO2@NiPS/TiO2 photocatalyst with a degradation efficacy of 93% after three cycles. The porous flake-like morphology of the nickel phyllosilicate acted as a suitable support for the TiO2 nanoparticles. Further, a coating of TiO2 on the mSiO2@NiPS surface greatly affected the surface features and optoelectronic properties of the core-shell nanostructure and yielded superior photocatalytic properties.
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Affiliation(s)
- Bridget K Mutuma
- DSI-NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa
| | - Xiluva Mathebula
- DSI-NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa
| | - Isaac Nongwe
- Department of Natural Resources and Materials, Botswana Institute for Technology Research and Innovation, 50654 Machel Drive, Gaborone, Botswana
| | - Bonakele P Mtolo
- DSI-NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa
| | - Boitumelo J Matsoso
- DSI-NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa
| | - Rudolph Erasmus
- School of Physics, University of Witwatersrand, WITS 2050, Johannesburg, South Africa
| | - Zikhona Tetana
- DSI-NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa
| | - Neil J Coville
- DSI-NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa
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40
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Gopalan AI, Lee JC, Saianand G, Lee KP, Chun WY, Hou YL, Kannan V, Park SS, Kim WJ. Cost-Effective Production of TiO 2 with 90-Fold Enhanced Photocatalytic Activity Via Facile Sequential Calcination and Ball Milling Post-Treatment Strategy. MATERIALS 2020; 13:ma13225072. [PMID: 33182834 PMCID: PMC7696072 DOI: 10.3390/ma13225072] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 10/28/2020] [Accepted: 11/06/2020] [Indexed: 11/25/2022]
Abstract
Titanium dioxide (TiO2), the golden standard among the photocatalysts, exhibits a varying level of photocatalytic activities (PCA) amongst the synthetically prepared and commercially available products. For commercial applications, superior photoactivity and cost-effectiveness are the two main factors to be reckoned with. This study presents the development of simple, cost-effective post-treatment processes for a less costly TiO2 to significantly enhance the PCA to the level of expensive commercial TiO2 having demonstrated superior photoactivities. We have utilized sequential calcination and ball milling (BM) post-treatment processes on a less-costlier KA100 TiO2 and demonstrated multi-fold (nearly 90 times) enhancement in PCA. The post-treated KA100 samples along with reference commercial samples (P25, NP400, and ST01) were well-characterized by appropriate instrumentation and evaluated for the PCA considering acetaldehyde photodegradation as the model reaction. Lattice parameters, phase composition, crystallite size, surface functionalities, titanium, and oxygen electronic environments were evaluated. Among post-treated KA100, the sample that is subjected to sequential 700 °C calcination and BM (KA7-BM) processes exhibited 90-fold PCA enhancement over pristine KA100 and the PCA-like commercial NP400 (pure anatase-based TiO2). Based on our results, we attribute the superior PCA for KA7-BM due to the smaller crystallite size, the co-existence of mixed anatase-srilankite-rutile phases, and the consequent multiphase heterojunction formation, higher surface area, lattice disorder/strain generation, and surface oxygen environment. The present work demonstrates a feasible potential for the developed post-treatment strategy towards commercial prospects.
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Affiliation(s)
- Anantha-Iyengar Gopalan
- School of Architecture and Civil Engineering, Daegyeong Regional Infrastructure Technology Development Center, Kyungpook National University, Daegu 41566, Korea; (A.-I.G.); (K.-P.L.)
| | - Jun-Cheol Lee
- Department of Architecture, Seowon University, Cheongju 28674, Korea;
| | - Gopalan Saianand
- Global Centre for Environmental Remediation (GCER), Faculty of Science, The University of Newcastle, Callaghan 2308, NSW, Australia;
| | - Kwang-Pill Lee
- School of Architecture and Civil Engineering, Daegyeong Regional Infrastructure Technology Development Center, Kyungpook National University, Daegu 41566, Korea; (A.-I.G.); (K.-P.L.)
| | - Woo-Young Chun
- Real-scale Fire Testing; Research Center, Korea Conformity Laboratories, 33-72, Eonjang 1-Gil, Samcheok-si, Gangwon-do 25913, Korea;
| | - Yao-long Hou
- Department of Civil Engineering, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu 41566, Korea; (Y.-l.H.); (S.-S.P.)
| | | | - Sung-Sik Park
- Department of Civil Engineering, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu 41566, Korea; (Y.-l.H.); (S.-S.P.)
| | - Wha-Jung Kim
- School of Architecture and Civil Engineering, Daegyeong Regional Infrastructure Technology Development Center, Kyungpook National University, Daegu 41566, Korea; (A.-I.G.); (K.-P.L.)
- Correspondence: ; Tel.: +82-53-950-6335
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41
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Terephthalate acid decorated TiO2 for visible light driven photocatalysis mediated via ligand-to-metal charge transfer (LMCT). Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125188] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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42
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Freyria FS, Blangetti N, Esposito S, Nasi R, Armandi M, Annelio V, Bonelli B. Effects of the Brookite Phase on the Properties of Different Nanostructured TiO 2 Phases Photocatalytically Active Towards the Degradation of N-Phenylurea. ChemistryOpen 2020; 9:903-912. [PMID: 32908812 PMCID: PMC7464118 DOI: 10.1002/open.202000127] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 07/17/2020] [Indexed: 11/30/2022] Open
Abstract
Different sol-gel synthesis methods were used to obtain four nanostructured mesoporous TiO2 samples for an efficient photocatalytic degradation of the emerging contaminant N-phenylurea under either simulated solar light (1 Sun) or UV light. Particularly, two TiO2 samples were obtained by means of as many template-assisted syntheses, whereas other two TiO2 samples were obtained by a greener template-free procedure, implying acidic conditions and, then, calcination at either 200 °C or 600 °C. In one case, anatase was obtained, whereas in the other three cases mixed crystalline phases were obtained. The four TiO2 samples were characterized by X-ray powder diffraction (followed by Rietveld analysis); Transmission Electron Microscopy; N2 adsorption/desorption at -196 °C; Diffuse Reflectance UV/Vis spectroscopy and ζ-potential measurements. A commercial TiO2 powder (i. e., Degussa P25) was used for comparison. Differences among the synthesized samples were observed not only in their quantitative phase composition, but also in their nanoparticles morphology (shape and size), specific surface area, pore size distribution and pHIEP (pH at isoelectric point), whereas the samples band-gap did not vary sizably. The samples showed different photocatalytic behavior in terms of N-phenylurea degradation, which are ascribed to their different physico-chemical properties and, especially, to their phase composition, stemming from the different synthesis conditions.
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Affiliation(s)
- Francesca S. Freyria
- Department of Applied Science and Technology and INSTMUnit of Torino PolitecnicoPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
- Department of ChemistryMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Nicola Blangetti
- Department of Applied Science and Technology and INSTMUnit of Torino PolitecnicoPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
| | - Serena Esposito
- Department of Applied Science and Technology and INSTMUnit of Torino PolitecnicoPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
| | - Roberto Nasi
- Department of Applied Science and Technology and INSTMUnit of Torino PolitecnicoPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
| | - Marco Armandi
- Department of Applied Science and Technology and INSTMUnit of Torino PolitecnicoPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
| | - Vincenzo Annelio
- Department of Applied Science and Technology and INSTMUnit of Torino PolitecnicoPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
| | - Barbara Bonelli
- Department of Applied Science and Technology and INSTMUnit of Torino PolitecnicoPolitecnico di TorinoCorso Duca degli Abruzzi 2410129TorinoItaly
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Tan R, Wang Y, Jin Z, Zhang P, Luo H, Liu D, Mamba BB, Kuvarega AT, Gui J. Preparation of carbon-coated brookite@anatase TiO 2 heterophase junction nanocables with enhanced photocatalytic performance. Photochem Photobiol Sci 2020; 19:966-975. [PMID: 32525187 DOI: 10.1039/d0pp00004c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-dimensional TiO2@C nanocables with a heterophase junction have been successfully prepared by coating brookite@anatase TiO2 with a thin layer of hydrothermal carbon (HTC). Compared with anatase TiO2, the biphase brookite@anatase structure can reduce the recombination rate of the excited electron/hole pairs of TiO2. The HTC coating not only enhances the adsorption capability of the TiO2 catalyst for organic pollutants but also facilitates photogenerated electron transfer to further increase its photocatalytic activity. Therefore, compared with anatase TiO2, brookite@anatase TiO2, and TiO2@C, the brookite@anatase TiO2@C shows the highest photocatalytic activity for the photodegradation of tetracycline (TC) under the irradiation of UV-visible light. Moreover, ˙O2 has been proved to be the predominant active species for the photodegradation of TC, and the photocatalytic mechanism of brookite@anatase TiO2@C nanocables has also been proposed.
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Affiliation(s)
- Rui Tan
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Yonglin Wang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Zhouzheng Jin
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Peng Zhang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Hengzhi Luo
- Fushun YiKeSi New Materials Co., Ltd, 113000, Fushun, Liaoning, China
| | - Dan Liu
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China. .,College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa.
| | - Bhekie B Mamba
- College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa
| | - Alex T Kuvarega
- College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa
| | - Jianzhou Gui
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China.,College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa
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44
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Visible light-induced degradation of antibiotic ciprofloxacin over Fe–N–TiO2 mesoporous photocatalyst with anatase/rutile/brookite nanocrystal mixture. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112371] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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45
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Effect of Calcination Temperature on Photocatalytic Activity of Synthesized TiO2 Nanoparticles via Wet Ball Milling Sol-Gel Method. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10030993] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this work, TiO2 nanoparticles were successfully synthesized with narrow size distribution via a wet ball milling sol-gel method. The effect of calcination temperature on photocatalytic activity was observed from particle size, crystallite size, and phase transition of TiO2 nanoparticles. Increasing calcination temperature increased particle size, crystallite size, and the crystallinity of synthesized TiO2. Phase transition depended on variation in calcination temperatures. A two-phase mixture of anatase and brookite was obtained with lower calcination temperature whereas a three-phase mixture appeared when calcination temperature was 500–600 °C. With higher temperature, the rutile phase kept increasing until it was the only phase observed at 800 °C. Anatase strongly affected the photocatalytic activity from 300 °C to 600 °C while the particle size of TiO2 was found to have a dominant effect on the photocatalytic activity between 600 °C and 700 °C. A mixture of three phases of TiO2-600 exhibited the highest methylene blue degradation with the rate constant of 9.46 × 10−2 h−1 under ultraviolet (UV) irradiation.
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46
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El Jemli Y, Mansori M, Gonzalez Diaz O, Barakat A, Solhy A, Abdelouahdi K. Controlling the growth of nanosized titania via polymer gelation for photocatalytic applications. RSC Adv 2020; 10:19443-19453. [PMID: 35515433 PMCID: PMC9054054 DOI: 10.1039/d0ra03312j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 05/08/2020] [Indexed: 11/21/2022] Open
Abstract
Nanocrystalline titania was synthesized by a simple, innovative and eco-friendly gelation method by using biopolymers (polysaccharides).
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Affiliation(s)
| | | | - Oscar Gonzalez Diaz
- Grupo de Fotocatálisis y Espectroscopía para Aplicaciones Medioambientales (Grupo FEAM)
- Unidad Asociada al CSIC
- Dpto Química
- Instituto de Estudios Ambientales y Recursos Naturales i-UNAT
- Universidad de Las Palmas de Gran Canaria
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47
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Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective. Catalysts 2019. [DOI: 10.3390/catal9121054] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Titania photocatalysts have been intensively examined for both mechanism study and possible commercial applications for more than 30 years. Although various reports have already been published on titania, including comprehensive review papers, the morphology-governed activity, especially for novel nanostructures, has not been reviewed recently. Therefore, this paper presents novel, attractive, and prospective titania photocatalysts, including zero-, one-, two-, and three-dimensional titania structures. The 1D, 2D, and 3D titania structures have been mainly designed for possible applications, e.g., (i) continuous use without the necessity of particulate titania separation, (ii) efficient light harvesting (e.g., inverse opals), (iii) enhanced activity (fast charge carriers’ separation, e.g., 1D nanoplates and 2D nanotubes). It should be pointed out that these structures might be also useful for mechanism investigation, e.g., (i) 3D titania aerogels with gold either incorporated inside the 3D network or supported in the porosity, and (ii) titania mesocrystals with gold deposited either on basal or lateral surfaces, for the clarification of plasmonic photocatalysis. Moreover, 0D nanostructures of special composition and morphology, e.g., magnetic(core)–titania(shell), mixed-phase titania (anatase/rutile/brookite), and faceted titania NPs have been presented, due to their exceptional properties, including easy separation in the magnetic field, high activity, and mechanism clarification, respectively. Although anatase has been usually thought as the most active phase of titania, the co-existence of other crystalline phases accelerates the photocatalytic activity significantly, and thus mixed-phase titania (e.g., famous P25) exhibits high photocatalytic activity for both oxidation and reduction reactions. It is believed that this review might be useful for the architecture design of novel nanomaterials for broad and diverse applications, including environmental purification, energy conversion, synthesis and preparation of “intelligent” surfaces with self-cleaning, antifogging, and antiseptic properties.
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48
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Woo An G, Dhandole LK, Park H, Sub Bae H, Mahadik MA, Suk Jang J. Enhanced Charge Transfer Process in Morphology Restructured TiO
2
Nanotubes via Hydrochloric Acid Assisted One Step
In‐Situ
Hydrothermal Approach. ChemCatChem 2019. [DOI: 10.1002/cctc.201901177] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Gil Woo An
- Division of Biotechnology, Advanced Institute of Environmental and Bioscience College of Environmental and Bioresource SciencesChonbuk National University Iksan 570-752 Republic of Korea
| | - Love Kumar Dhandole
- Division of Biotechnology, Advanced Institute of Environmental and Bioscience College of Environmental and Bioresource SciencesChonbuk National University Iksan 570-752 Republic of Korea
| | - Hyunwoong Park
- School of Energy EngineeringKyungpook University Daegu 41566 Republic of Korea
| | - Ho Sub Bae
- Division of Biotechnology, Advanced Institute of Environmental and Bioscience College of Environmental and Bioresource SciencesChonbuk National University Iksan 570-752 Republic of Korea
| | - Mahadeo A. Mahadik
- Division of Biotechnology, Advanced Institute of Environmental and Bioscience College of Environmental and Bioresource SciencesChonbuk National University Iksan 570-752 Republic of Korea
| | - Jum Suk Jang
- Division of Biotechnology, Advanced Institute of Environmental and Bioscience College of Environmental and Bioresource SciencesChonbuk National University Iksan 570-752 Republic of Korea
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49
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Versatile titanium dioxide nanoparticles prepared by surface-grown polymerization of polyethylenimine for photodegradation and catalytic C C bond forming reactions. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.110501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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50
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Kozhevnikova NS, Ul’yanova ES, Shalaeva EV, Zamyatin DA, Bokunyaeva AO, Yushkov AA, Kolosov VY, Buldakova LY, Yanchenko MY, Gorbunova TI, Pervova MG, Enyashin AN, Vorokh AS. Low-Temperature Sol–Gel Synthesis and Photoactivity of Nanocrystalline TiO2 with the Anatase/Brookite Structure and an Amorphous Component. KINETICS AND CATALYSIS 2019. [DOI: 10.1134/s002315841903008x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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