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Sharma J, Joshi M, Bhatnagar A, Chaurasia AK, Nigam S. Pharmaceutical residues: One of the significant problems in achieving 'clean water for all' and its solution. ENVIRONMENTAL RESEARCH 2022; 215:114219. [PMID: 36057333 DOI: 10.1016/j.envres.2022.114219] [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: 02/18/2022] [Revised: 08/22/2022] [Accepted: 08/24/2022] [Indexed: 06/15/2023]
Abstract
With the rapid emergence of various metabolic and multiple-drug-resistant infectious diseases, new pharmaceuticals are continuously being introduced in the market. The excess production and use of pharmaceuticals and their untreated/unmetabolized release in the environment cause the contamination of aquatic ecosystem, and thus, compromise the environment and human-health. The present review provides insights into the classification, sources, occurrence, harmful impacts, and existing technologies to curb these problems. A comprehensive detail of various biological and nanotechnological strategies for the removal of pharmaceutical residues from water is critically discussed focusing on their efficiencies, and current limitations to design improved-technologies for their lab-to-field applications. Furthermore, the review highlights and suggests the scope of integrated bionanotechnological methods for enhanced removal of pharmaceutical residues from water to fulfill the United Nations Sustainable Development Goal (UN-SDG) for providing clean potable water for all.
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Affiliation(s)
- Jyoti Sharma
- Amity Institute of Biotechnology, Amity University, Noida, 201313, Uttar Pradesh, India
| | - Monika Joshi
- Amity Institute of Nanotechnology, Amity University, Noida, 201313, Uttar Pradesh, India.
| | - Amit Bhatnagar
- Department of Separation Science, LUT School of Engineering Science, LUT University, Sammonkatu 12, FI-50130, Mikkeli, Finland
| | - Akhilesh K Chaurasia
- Department of Precision Medicine, School of Medicine, Sungkyunkwan University (SKKU), Suwon, 16419, South Korea.
| | - Subhasha Nigam
- Amity Institute of Biotechnology, Amity University, Noida, 201313, Uttar Pradesh, India.
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2
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Manpetch P, Singhapong W, Jaroenworaluck A. A comparative study of TiO 2 nanoparticles and Cu(II)/TiO 2 nanocomposites on photodegradation of cinnamic acid (CA) under natural sunlight and artificial UV light. J DISPER SCI TECHNOL 2022. [DOI: 10.1080/01932691.2022.2068568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Panlekha Manpetch
- National Metal and Materials Technology Center, National Science and Technology Development Agency, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - Wadwan Singhapong
- National Metal and Materials Technology Center, National Science and Technology Development Agency, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - Angkhana Jaroenworaluck
- National Metal and Materials Technology Center, National Science and Technology Development Agency, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
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3
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Microflowery, Microspherical, and Fan-Shaped TiO2 Crystals via Hierarchical Self-Assembly of Nanorods with Exposed Specific Crystal Facets and Enhanced Photocatalytic Performance. Catalysts 2022. [DOI: 10.3390/catal12020232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
In this paper, khaki titanium dioxide (TiO2) crystals via hierarchical self-assembly of nanorods with different morphologies and specific exposed crystal facets were prepared for the first time by using a TiCl3 treatment process in the presence and absence of morphology-controlling agents. The crystal structure, morphology, microstructure, specific surface area, and separation efficiency of photogenerated electron-hole pairs of the synthesized TiO2 crystals were characterized. The photocatalytic and recycled performances of the synthesized TiO2 crystals in the presence of shape-controlling agents, such as ammonium sulfate (AS), ammonium carbonate (AC), and urea, and the absence of shape-controlling agents (the obtained TiO2 crystals were expressed as AS-TiO2, AC-TiO2, urea-TiO2, and No-TiO2, respectively) were evaluated and compared with the commercial TiO2 (CM-TiO2) crystals. The AS-TiO2 microspheres with exposed uncertain facets exhibited enhanced photocatalytic activity for the degradation of methylene blue solution, which can be attributed to the combined effect of the anatase phase structure, relatively larger specific surface area, and the effective separation of the photogenerated electron-holes.
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4
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Vasudevan S, Srinivasan P, Neelakantan P, Rayappan JBB, Solomon AP. Photoluminescence-Based Bioassay With Cysteamine-Capped TiO 2 Nanoparticles for the Selective Recognition of N-Acyl Homoserine Lactones. Front Bioeng Biotechnol 2021; 9:750933. [PMID: 34926417 PMCID: PMC8678280 DOI: 10.3389/fbioe.2021.750933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Accepted: 11/08/2021] [Indexed: 11/13/2022] Open
Abstract
Currently available diagnostic procedures for infections are laborious and time-consuming, resulting in a substantial financial burden by increasing morbidity, increased costs of hospitalization, and mortality. Therefore, innovative approaches to design diagnostic biomarkers are imperative to assist in the rapid and sensitive diagnosis of microbial infections. Acyl homoserine lactones (AHLs) are ubiquitous bacterial signaling molecules that are found to be significantly upregulated in infected sites. In this pioneering work, we have developed a simple photoluminescence-based assay using cysteamine-capped titanium oxide (TiO2) nanoparticles for AHL detection. The PL intensity variation of the oxygen defect state of TiO2 was used for the biosensing measurements. The bioassays were validated using two well-studied AHL molecules (C4-HSL and 3-oxo-C12 HSL) of an important human pathogen, Pseudomonas aeruginosa. The developed system has a maximum relative response of 98%. Furthermore, the efficacy of the system in simulated host urine using an artificial urine medium showed a linear detection range of 10-160 nM. Also, we confirmed the relative response and specificity of the system in detecting AHLs produced by P. aeruginosa in a temporal manner.
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Affiliation(s)
- Sahana Vasudevan
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, India
| | - Parthasarathy Srinivasan
- Nanosensors Laboratory, School of Electrical & Electronics Engineering, Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), SASTRA Deemed University, Thanjavur, India
- Department of Electronics and Communication Engineering, Amrita School of Engineering, AMRITA Vishwa Vidyapeetham Chennai Campus, Chennai, India
| | - Prasanna Neelakantan
- Faculty of Dentistry, The University of Hong Kong, Pokfulam, Hong KongSAR, China
| | - John Bosco Balaguru Rayappan
- Nanosensors Laboratory, School of Electrical & Electronics Engineering, Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), SASTRA Deemed University, Thanjavur, India
| | - Adline Princy Solomon
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, India
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5
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Jang HJ, Park SJ, Yang JH, Hong SM, Rhee CK, Sohn Y. Photocatalytic and Electrocatalytic Properties of Cu-Loaded ZIF-67-Derivatized Bean Sprout-Like Co-TiO 2/Ti Nanostructures. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1904. [PMID: 34443738 PMCID: PMC8399894 DOI: 10.3390/nano11081904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 07/20/2021] [Accepted: 07/22/2021] [Indexed: 01/03/2023]
Abstract
ZIF-derivatized catalysts have shown high potential in catalysis. Herein, bean sprout-like Co-TiO2/Ti nanostructures were first synthesized by thermal treatment at 800 °C under Ar-flow conditions using sacrificial ZIF-67 templated on Ti sheets. It was observed that ZIF-67 on Ti sheets started to thermally decompose at around 350 °C and was converted to the cubic phase Co3O4. The head of the bean sprout structure was observed to be Co3O4, while the stem showed a crystal structure of rutile TiO2 grown from the metallic Ti support. Cu sputter-deposited Co-TiO2/Ti nanostructures were also prepared for photocatalytic and electrocatalytic CO2 reduction performances, as well as electrochemical oxygen reaction (OER). Gas chromatography results after photocatalytic CO2 reduction showed that CH3OH, CO and CH4 were produced as major products with the highest MeOH selectivity of 64% and minor C2 compounds of C2H2, C2H4 and C2H6. For electrocatalytic CO2 reduction, CO, CH4 and C2H4 were meaningfully detected, but H2 was dominantly produced. The amounts were observed to be dependent on the Cu deposition amount. Electrochemical OER performances in 0.1 M KOH electrolyte exhibited onset overpotentials of 330-430 mV (vs. RHE) and Tafel slopes of 117-134 mV/dec that were dependent on Cu-loading thickness. The present unique results provide useful information for synthesis of bean sprout-like Co-TiO2/Ti hybrid nanostructures and their applications to CO2 reduction and electrochemical water splitting in energy and environmental fields.
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Affiliation(s)
- Hye Ji Jang
- Department of Chemistry, Chungnam National University, Daejeon 34134, Korea; (H.J.J.); (S.J.P.); (J.H.Y.); (S.-M.H.); (C.K.R.)
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea
| | - So Jeong Park
- Department of Chemistry, Chungnam National University, Daejeon 34134, Korea; (H.J.J.); (S.J.P.); (J.H.Y.); (S.-M.H.); (C.K.R.)
| | - Ju Hyun Yang
- Department of Chemistry, Chungnam National University, Daejeon 34134, Korea; (H.J.J.); (S.J.P.); (J.H.Y.); (S.-M.H.); (C.K.R.)
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea
| | - Sung-Min Hong
- Department of Chemistry, Chungnam National University, Daejeon 34134, Korea; (H.J.J.); (S.J.P.); (J.H.Y.); (S.-M.H.); (C.K.R.)
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea
| | - Choong Kyun Rhee
- Department of Chemistry, Chungnam National University, Daejeon 34134, Korea; (H.J.J.); (S.J.P.); (J.H.Y.); (S.-M.H.); (C.K.R.)
| | - Youngku Sohn
- Department of Chemistry, Chungnam National University, Daejeon 34134, Korea; (H.J.J.); (S.J.P.); (J.H.Y.); (S.-M.H.); (C.K.R.)
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea
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6
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Liang YC, Zhao WC. Crystal Growth and Design of Disk/Filament ZnO-Decorated 1D TiO 2 Composite Ceramics for Photoexcited Device Applications. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:667. [PMID: 33800484 PMCID: PMC7999806 DOI: 10.3390/nano11030667] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/03/2021] [Accepted: 03/05/2021] [Indexed: 11/17/2022]
Abstract
Disk- and filament-like ZnO crystals were decorated on one-dimensional TiO2 nanostructures (TiO2-ZnO) through various integrated physical and chemical synthesis methods. The morphology of the ZnO crystals on TiO2 varied with the chemical synthesis method used. ZnO nanodisks decorated with TiO2 nanorods (TiO2-ZnO-C) were synthesized using the chemical bath deposition method, and ZnO filament-like crystals decorated with TiO2 nanorods (TiO2-ZnO-H) were synthesized through the hydrothermal method. Compared with the pristine TiO2 nanorods, the as-synthesized TiO2-ZnO composites exhibited enhanced photophysiochemical performance. Furthermore, because of their fast electron transportation and abundant surface active sites, the ZnO nanodisks in the TiO2-ZnO-C composite exhibited a higher photoactivity than those in the TiO2-ZnO-H composite. The morphology and crystal quality of the ZnO decoration layer were manipulated using different synthesis methods to realize disk- or filament-like ZnO-decorated TiO2 composites with various photoactive performance levels.
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Affiliation(s)
- Yuan-Chang Liang
- Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, Taiwan;
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7
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Khan A, Goepel M, Kubas A, Łomot D, Lisowski W, Lisovytskiy D, Nowicka A, Colmenares JC, Gläser R. Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Visible Light-Driven Photocatalysis over In Situ Substrate-Sensitized Titania. CHEMSUSCHEM 2021; 14:1351-1362. [PMID: 33453092 PMCID: PMC7986172 DOI: 10.1002/cssc.202002687] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/30/2020] [Indexed: 06/12/2023]
Abstract
Solar energy-driven processes for biomass valorization are priority for the growing industrialized society. To address this challenge, efficient visible light-active photocatalyst for the selective oxidation of biomass-derived platform chemical is highly desirable. Herein, selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) was achieved by visible light-driven photocatalysis over titania. Pristine titania is photocatalytically inactive under visible light, so an unconventional approach was employed for the visible light (λ=515 nm) sensitization of titania via a formation of a visible light-absorbing complex of HMF (substrate) on the titania surface. Surface-complexation of HMF on titania mediated ligand-to-metal charge transfer (LMCT) under visible light, which efficiently catalyzed the oxidation of HMF to DFF. A high DFF selectivity of 87 % was achieved with 59 % HMF conversion after 4 h of illumination. The apparent quantum yield obtained for DFF production was calculated to be 6.3 %. It was proposed that the dissociative interaction of hydroxyl groups of HMF and the titania surface is responsible for the surface-complex formation. When the hydroxyl groups of titania were modified via surface-fluorination or calcination the oxidation of HMF was inhibited under visible light, signifying that hydroxyl groups are decisive for photocatalytic activity.
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Affiliation(s)
- Ayesha Khan
- Institute of Physical ChemistryPolish Academy of SciencesWarsaw01-224Poland
| | - Michael Goepel
- Institute of Chemical TechnologyLeipzig UniversityLeipzig04103Germany
| | - Adam Kubas
- Institute of Physical ChemistryPolish Academy of SciencesWarsaw01-224Poland
| | - Dariusz Łomot
- Institute of Physical ChemistryPolish Academy of SciencesWarsaw01-224Poland
| | - Wojciech Lisowski
- Institute of Physical ChemistryPolish Academy of SciencesWarsaw01-224Poland
| | - Dmytro Lisovytskiy
- Institute of Physical ChemistryPolish Academy of SciencesWarsaw01-224Poland
| | - Ariadna Nowicka
- Institute of Physical ChemistryPolish Academy of SciencesWarsaw01-224Poland
| | | | - Roger Gläser
- Institute of Chemical TechnologyLeipzig UniversityLeipzig04103Germany
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8
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Surface modification of TiO2 with Pd nanoparticles for enhanced photocatalytic oxidation of benzene micropollutants. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125959] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Vilé G. Photocatalytic materials and light-driven continuous processes to remove emerging pharmaceutical pollutants from water and selectively close the carbon cycle. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01713b] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
Past and present technologies for wastewater purification and future research directions are critically discussed in this review.
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Affiliation(s)
- Gianvito Vilé
- Department of Chemistry
- Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- IT-20133 Milano
- Italy
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10
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Dai W, Tao Y, Zou H, Xiao S, Li G, Zhang D, Li H. Gas-Phase Photoelectrocatalytic Oxidation of NO via TiO 2 Nanorod Array/FTO Photoanodes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:5902-5912. [PMID: 32250099 DOI: 10.1021/acs.est.9b07757] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Most photoelectrocatalytic (PEC) reactions are performed in the liquid phase for convenient electron transfer in an electrolyte solution. Herein, a novel PEC reactor involving a tandem combination of TiO2 nanorod array/fluorine-doped tin oxide (TiO2-NR/FTO) working electrodes and an electrochemical auxiliary cell was constructed to drive the highly efficient PEC oxidation of indoor gas (NOx). With the aid of a low bias voltage (0.3 V), the as-formed PEC reactor exhibited an 80% removal rate for oxidizing NO (500 ppb) under light irradiation, which is much higher than that of the traditional photocatalytic (PC) process. Upon being irradiated by light, the photogenerated electrons are quickly separated from the holes and transferred to the counter electrode (Pt) owing to the applied bias voltage, leaving photogenerated holes in the TiO2-NR/FTO electrode for oxidizing NO molecules. Moreover, both dry and humid NO could be effectively removed by the tandem TiO2-NR/FTO-based gas-phase PEC reactor, indicating that the NO molecules could also be directly oxidized by photogenerated holes in addition to hydroxyl radicals. The presence of trace amounts of water could promote the PEC oxidation of NO owing to the formation of hydroxyl radicals induced by reactions between the water and holes, which could further oxidize NO. This PEC reactor offers an energy-saving, environmentally friendly, and efficient route to treat air polluted with low concentrations of gases (NOx and SOx).
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Affiliation(s)
- Wenrui Dai
- Chinese Education Ministry Key Lab and International Joint Lab of Resource Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Ying Tao
- Chinese Education Ministry Key Lab and International Joint Lab of Resource Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Hangjun Zou
- Chinese Education Ministry Key Lab and International Joint Lab of Resource Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Shuning Xiao
- Chinese Education Ministry Key Lab and International Joint Lab of Resource Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Guisheng Li
- Chinese Education Ministry Key Lab and International Joint Lab of Resource Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Dieqing Zhang
- Chinese Education Ministry Key Lab and International Joint Lab of Resource Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Hexing Li
- Chinese Education Ministry Key Lab and International Joint Lab of Resource Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
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11
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Niu P, Wu G, Chen P, Zheng H, Cao Q, Jiang H. Optimization of Boron Doped TiO 2 as an Efficient Visible Light-Driven Photocatalyst for Organic Dye Degradation With High Reusability. Front Chem 2020; 8:172. [PMID: 32232026 PMCID: PMC7082229 DOI: 10.3389/fchem.2020.00172] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 02/26/2020] [Indexed: 11/13/2022] Open
Abstract
No visible light activity is the bottle neck for wide application of TiO2, and Boron doping is one of the effective way to broaden the adsorption edge of TiO2. In this study, several Boron doped TiO2 materials were prepared via a facile co-precipitation and calcination process. The B doping amounts were optimized by the degradation of rhodamine B (Rh B) under visible light irradiation, which indicated that when the mass fraction of boron is 6% (denoted as 6B-TiO2), the boron doped TiO2 materials exhibited the highest activity. In order to investigate the enhanced mechanism, the difference between B-doped TiO2 and bare TiO2 including visible light harvesting abilities, separation efficiencies of photo-generated electron-hole pairs, photo-induced electrons generation abilities, photo-induced charges transferring speed were studied and compared in details. h+ and ·O2- were determined to be the two main responsible active species in the photocatalytic oxidation process. Besides the high degradation efficiency, 6B-TiO2 also exhibited high reusability in the photocatalysis, which could be reused at least 5 cycles with almost no active reduction. The results indicate that 6B-TiO2 has high photocatalytic degradation ability toward organic dye of rhodamine B under visible light irradiation, which is a highly potential photocatalyst to cope with organic pollution.
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Affiliation(s)
- Pingping Niu
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, China.,College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, China
| | - Guanghui Wu
- College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, China
| | - Pinghua Chen
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, China.,College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, China
| | - Huitao Zheng
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, China.,College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, China
| | - Qun Cao
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, China
| | - Hualin Jiang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, China.,College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, China
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12
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De Lile J, Kang SG, Son YA, Lee SG. Investigating Polaron Formation in Anatase and Brookite TiO 2 by Density Functional Theory with Hybrid-Functional and DFT + U Methods. ACS OMEGA 2019; 4:8056-8064. [PMID: 31459895 PMCID: PMC6648264 DOI: 10.1021/acsomega.9b00443] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Accepted: 04/24/2019] [Indexed: 05/31/2023]
Abstract
Anatase and brookite are robust materials with enhanced photocatalytic properties. In this study, we used density functional theory (DFT) with a hybrid functional and the Hubbard on-site potential methods to determine electron- and hole-polaron geometries for anatase and brookite and their energetics. Localized electron and hole polarons were predicted not to form in anatase using DFT with hybrid functionals. In contrast, brookite formed both electron and hole polarons. The brookite electron-polaronic solution exhibits coexisting localized and delocalized states, with hole polarons mainly dispersed on two-coordinated oxygen ions. Hubbard on-site potential testing over the wide 4.0-10 eV range revealed that brookite polarons are formed at U = 6 eV, while anatase polarons are formed at U = 8 eV. The brookite electron polaron was always localized on a single titanium ion under the Hubbard model, whereas the hole polaron was dispersed over four oxygen atoms, consistent with the hybrid DFT studies. The anatase electron polarons were dispersed at lower on-site potentials but were more localized at higher potentials. Both methods predict that brookite has a higher driving force for the formation of polarons than anatase.
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Affiliation(s)
- Jeffrey
Roshan De Lile
- Department
of Organic Material Science and Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic
of Korea
| | - Sung Gu Kang
- School
of Chemical Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, Republic
of Korea
| | - Young-A Son
- Department
of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Republic
of Korea
| | - Seung Geol Lee
- Department
of Organic Material Science and Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic
of Korea
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13
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Liu E, Xu C, Jin C, Fan J, Hu X. Carbon quantum dots bridged TiO2 and Cd0.5Zn0.5S film as solid-state Z-scheme photocatalyst with enhanced H2 evolution activity. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2019.02.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Gong C, Du J, Li X, Yu Z, Ma J, Qi W, Zhang K, Yang J, Luo M, Peng H. One-Step Acidic Hydrothermal Preparation of Dendritic Rutile TiO₂ Nanorods for Photocatalytic Performance. NANOMATERIALS 2018; 8:nano8090683. [PMID: 30200447 PMCID: PMC6164732 DOI: 10.3390/nano8090683] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 08/29/2018] [Accepted: 08/30/2018] [Indexed: 11/16/2022]
Abstract
Three-dimensional and dendritic rutile TiO₂ nanorods were successfully fabricated on a Ti foil surface using a one-step acidic hydrothermal method. The TiO₂ nanorods were characterized using X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and optical contact angle testing. The results showed that the nanorods with diameters of 100⁻500 nm and lengths of 100 nm to 1 μm were obtained on the Ti foil surface. The length and density of the TiO₂ nanorods were perfect at the conditions of HCl concentration 0.5 mol/L, temperature 220 °C, and reaction time 12 h. The TiO₂ nanorods formed parallel to the consumption of Ti and grew along the (110) direction having a tetragonal rutile crystal. The morphology of the nanorods possessed a three-dimensional structure. The contact angle of the nanorods was only 13 ± 3.1°. Meanwhile, the photocatalytic activities of the TiO₂ nanorods were carried out using ultraviolet fluorescence spectrophotometry for the methyl orange detection, and the degradation was found to be about 71.00% ± 2.43%. Thus, TiO₂ nanorods can be developed by a one-step acidic hydrothermal method using Ti foil simultaneously as the substrate with a TiO₂ source; the TiO₂ nanorods exhibited photocatalytic performance while being environment-friendly.
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Affiliation(s)
- Cheng Gong
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Jun Du
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
- Key Lab of Poyang Lake Ecology and Bio-resource Utilization (Ministry of Education), Nanchang University, Nanchang 330031, China.
- Jiangxi Province Key Laboratory of Edible and Medicinal Plant Resources, Nanchang University, Nanchang 330031, China.
| | - Xiuyun Li
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Zhenjie Yu
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Jiansong Ma
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Wenqian Qi
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Kai Zhang
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Jin Yang
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Mei Luo
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
| | - Hailong Peng
- Department of Chemical Engineering, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China.
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