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Xie G, Wang L, Zhu Q, Chu Z, Tian S, Gui Z, Song K, Yu Z. Regulating Alkyl Chain Length on Quaternization TiO 2 for Boosting Photocatalytic Performance: Synergism of Promoting Photogenerated Charge Separation and Improving Reactant Adsorption. ACS APPLIED MATERIALS & INTERFACES 2022; 14:57428-57439. [PMID: 36529966 DOI: 10.1021/acsami.2c18350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
To explore the effect of surface charge properties of a photocatalyst on photocatalytic activity, quaternization TiO2 particles with different alkyl chain lengths (CT-X/P25) are first synthesized to boost the photocatalytic activity. The effect of a quaternary ammonium group with different alkyl chain lengths on the photocatalytic activity of CT-X/P25 is investigated. Interestingly, the introduction of a quaternary ammonium group on CT-X/P25 not only contributes to improving the photodegradation efficiency of anionic dyes due to enhancing of adsorption capacity through electrostatic attraction, but also it can improve the photodegradation efficiency of cationic dyes. Therefore, there seems to be another factor affecting the photocatalytic activity. The results of photoelectric characterization show that the photogenerated charge separation of CT-X/P25 is greatly enhanced, which is beneficial to improve the photocatalytic activity. Simultaneously, the results show that the difference in the photocatalytic activity of CT-X/P25 is mainly related to the charge intensity of -N+(CH3)2- in the quaternary amine salt. According to X-ray photoelectron spectroscopy, the charge intensity of -N+(CH3)2- in CT-X/P25 gradually increases with the increase in alkyl chain lengths, which is conducive to promoting photogenerated charge separation and improving the adsorption for anionic dyes. The photocatalytic activity has been further enhanced due to the enhancement of this synergy. In summary, the quaternary ammonium salt-modified CT-X/P25 shows an excellent synergistic effect on the process of photodegradation of anionic dyes: promoting photogenerated charge separation and adsorption.
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Affiliation(s)
- Guangyuan Xie
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
| | - Lei Wang
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
- Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing, Zhejiang312000, China
- China National Textile and Apparel Council Key Laboratory of Natural Dyes, Soochow University, Suzhou215123, China
| | - Qiuyu Zhu
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
| | - Zihao Chu
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
| | - Shuang Tian
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
| | - Zuwen Gui
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
| | - Kaili Song
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
| | - Zhicheng Yu
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou310018, Zhejiang, China
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Selective degradation of mixed dye pollutant in aqueous phase in the presence of ZnO/Al2O3 as sonophotocatalysis based on central composite design. KOREAN J CHEM ENG 2021. [DOI: 10.1007/s11814-021-0816-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Low-power CO2 laser-fabricated catalyst for the remediation of Reactive Red-45: Intense product analysis using LC-MS and HPIC. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.062] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Preparation of TiO2-Poly(3-Chloro-2-Hydroxypropyl Methacrylate) Nanocomposite for Selective Adsorption and Degradation of Dyes. TECHNOLOGIES 2018. [DOI: 10.3390/technologies6040092] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We report a new nanocomposite TiO2-poly(3-chloro-2-hydroxypropyl methacrylate) (TiO2-PCHPMA) for selective adsorption/degradation of cationic dyes and degradation of anionic dyes. TiO2-PCHPMA was prepared by free radical polymerization of CHPMA in the presence of TiO2 modified with 3-(trimethoxysilyl)propyl methacrylate. TiO2-PCHPMA adsorbed cationic methylene blue (MB), but did not adsorb anionic methyl orange (MO) in their aqueous solutions. The adsorption efficiency for MB reached 99% within 5 min at 28 °C, and adsorbed MB could be recycled in 96% efficiency. The adsorption accelerated degradation of MB under UV irradiation. The degradation of anionic MO proceeded completely with TiO2-PCHPMA under UV irradiation, and the efficiency was not affected by the PCHPMA layer. TiO2-PCHPMA is potentially applicable as a material capable of selective removal and recovery of cationic dyes, and degradation of other dyes from industrial effluents.
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Naresh G, Malik J, Meena V, Mandal TK. pH-Mediated Collective and Selective Solar Photocatalysis by a Series of Layered Aurivillius Perovskites. ACS OMEGA 2018; 3:11104-11116. [PMID: 31459219 PMCID: PMC6644761 DOI: 10.1021/acsomega.8b01054] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 08/31/2018] [Indexed: 06/10/2023]
Abstract
Semiconductor photocatalysis under natural sunlight is an emergent area in contemporary materials research, which has attracted considerable attention toward the development of catalysts for environmental remediation using solar energy. A series of five-layer Aurivillius-phase perovskites, Bi5ATi4FeO18 (A = Ca, Sr, and Pb), are synthesized for the first time. Rietveld refinements of the powder X-ray diffraction data indicated orthorhombic structure for the Aurivillius phases with Fe largely occupying the central octahedral layer, whereas the divalent cations (Ca, Sr, and Pb) are statistically distributed over the cubo-octahedral A-sites of the perovskite. The compounds with visible-light-absorbing ability (E g ranging from ∼2.0 to 2.2 eV) not only exhibit excellent collective photocatalytic degradation of rhodamine B-methylene blue (MB) and rhodamine B-rhodamine 6G mixture at pH 2 but also show almost 100% photocatalytic selective degradation of MB from the rhodamine B-MB mixture at pH 11 under natural solar irradiation. The selectivity in the alkaline medium is believed to originate from the combined effect of the photocatalytic degradation of MB by the Aurivillius-phase perovskites and the photolysis of MB. Although a substantial decrease in MB adsorption from the mixed dye solution (MB + RhB) together with slower MB photolysis at the neutral pH makes the selective MB degradation sluggish, the compounds showed excellent photocatalytic degradation activity and chemical oxygen demand removal efficacy toward individual RhB (at pH 2) and MB (at pH 11) under sunlight irradiation. The catalysts are exceptionally stable and retain good crystallinity even after five successive cyclic runs without any noticeable loss of activity in both the acidic and alkaline media. The present work provides an important insight into the development of layered perovskite photocatalysts for collective degradation of multiple pollutants and selective removal of one or multiple pollutants from a mixture. The later idea may open up new possibilities for recovery/purification of useful chemical substances from the contaminated medium through selective photocatalysis.
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Affiliation(s)
- Gollapally Naresh
- Department
of Chemistry and Centre of Nanotechnology, Indian Institute
of Technology Roorkee, Roorkee 247 667, India
| | - Jaideep Malik
- Department
of Chemistry and Centre of Nanotechnology, Indian Institute
of Technology Roorkee, Roorkee 247 667, India
| | - Vandana Meena
- Department
of Chemistry and Centre of Nanotechnology, Indian Institute
of Technology Roorkee, Roorkee 247 667, India
| | - Tapas Kumar Mandal
- Department
of Chemistry and Centre of Nanotechnology, Indian Institute
of Technology Roorkee, Roorkee 247 667, India
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Pakdel E, Daoud WA, Seyedin S, Wang J, Razal JM, Sun L, Wang X. Tunable photocatalytic selectivity of TiO 2 /SiO 2 nanocomposites: Effect of silica and isolation approach. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.04.070] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Ciriminna R, Parrino F, De Pasquale C, Palmisano L, Pagliaro M. Photocatalytic partial oxidation of limonene to 1,2 limonene oxide. Chem Commun (Camb) 2018; 54:1008-1011. [PMID: 29323370 DOI: 10.1039/c7cc09788c] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The silylation of crystalline TiO2 P25, commonly used for photocatalytic degradation of pollutants, results in an exceptionally selective catalyst for the aerobic limonene epoxidation to 1,2-limonene oxide under solar light irradiation. The hypothesized mechanism involves the singlet oxygen generated through energy transfer from the excited TiO2 to adsorbed O2 molecules. The reaction product is the valued precursor of bio-based poly(limonene carbonate), a thermoplastic polymer of superior thermal and optical properties whose industrial production is in need of an efficient green synthesis of limonene oxide.
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Affiliation(s)
- Rosaria Ciriminna
- Istituto per lo Studio dei Materiali Nanostrutturati, CNR, via U. La Malfa 153, 90146 Palermo, Italy.
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Kashiwaya S, Aymonier C, Majimel J, Olivier C, Klein A, Jaegermann W, Toupance T. Supercritical CO2-assisted deposition of NiO on (101)-anatase-TiO2 for efficient facet engineered photocatalysts. NEW J CHEM 2018. [DOI: 10.1039/c8nj04292f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deposition of NiO on the (101) facet of anatase nanocrystals by the SFCD route yields nanocomposites more efficient than pure anatase TiO2 for the photodecomposition of both anionic and cationic dyes.
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Affiliation(s)
- S. Kashiwaya
- Institut des Sciences Moléculaires, ISM UMR 5255 CNRS, Université de Bordeaux
- F-33405 Talence
- France
- Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt
- 64287 Darmstadt
| | - C. Aymonier
- CNRS, Univ. Bordeaux
- Bordeaux INP
- ICMCB, UMR 5026
- France
| | - J. Majimel
- CNRS, Univ. Bordeaux
- Bordeaux INP
- ICMCB, UMR 5026
- France
| | - C. Olivier
- Institut des Sciences Moléculaires, ISM UMR 5255 CNRS, Université de Bordeaux
- F-33405 Talence
- France
| | - A. Klein
- Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt
- 64287 Darmstadt
- Germany
| | - W. Jaegermann
- Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt
- 64287 Darmstadt
- Germany
| | - T. Toupance
- Institut des Sciences Moléculaires, ISM UMR 5255 CNRS, Université de Bordeaux
- F-33405 Talence
- France
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Yu H, Xiao P, Tian J, Wang F, Yu J. Phenylamine-Functionalized rGO/TiO 2 Photocatalysts: Spatially Separated Adsorption Sites and Tunable Photocatalytic Selectivity. ACS APPLIED MATERIALS & INTERFACES 2016; 8:29470-29477. [PMID: 27734674 DOI: 10.1021/acsami.6b09903] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The preferential adsorption of targeted contaminants on a photocatalyst surface is highly required to realize its photocatalytic selective decomposition in a complex system. To realize the tunable preferential adsorption, altering the surface charge or polarity property of photocatalysts has widely been reported. However, it is quite difficult for a modified photocatalyst to realize the simultaneously preferential adsorption for both cationic and anionic dyes. In this study, to realize the selective adsorption for both cationic and anionic dyes on a photocatalyst surface, the negative reduced graphene oxide (rGO) nanosheets and positive phenylamine (PhNH2) molecules are successfully loaded on the TiO2 surface (PhNH2/rGO-TiO2) with spatially separated adsorption sites, where the negative rGO and positive PhNH2 molecules work as the preferential adsorption sites for cationic and anionic dyes, respectively. It was interesting to find that although all the TiO2 samples (including the naked TiO2, PhNH2/TiO2, rGO-TiO2, and PhNH2/rGO-TiO2) clearly showed a better adsorption performance for cationic dyes than anionic dyes, only the PhNH2/rGO-TiO2 with spatially separated adsorption-active sites exhibited an opposite photocatalytic selectivity, namely, the naked TiO2, PhNH2/TiO2, and rGO-TiO2 showed a preferential decomposition for cationic dyes, while the resultant PhNH2/rGO-TiO2 exhibited an excellently selective decomposition for anionic dyes. In addition, the resultant PhNH2/rGO-TiO2 photocatalyst not only realizes the tunable photocatalytic selectivity but also can completely and sequentially decompose the opposite cationic and anionic dyes.
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Affiliation(s)
- Huogen Yu
- State Key Laboratory of Silicate Materials for Architectures, ‡School of Chemistry, Chemical Engineering and Life Sciences and §State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology , Wuhan 430070, P. R. China
| | - Pian Xiao
- State Key Laboratory of Silicate Materials for Architectures, ‡School of Chemistry, Chemical Engineering and Life Sciences and §State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology , Wuhan 430070, P. R. China
| | - Jing Tian
- State Key Laboratory of Silicate Materials for Architectures, ‡School of Chemistry, Chemical Engineering and Life Sciences and §State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology , Wuhan 430070, P. R. China
| | - Fazhou Wang
- State Key Laboratory of Silicate Materials for Architectures, ‡School of Chemistry, Chemical Engineering and Life Sciences and §State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology , Wuhan 430070, P. R. China
| | - Jiaguo Yu
- State Key Laboratory of Silicate Materials for Architectures, ‡School of Chemistry, Chemical Engineering and Life Sciences and §State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology , Wuhan 430070, P. R. China
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Gali NK, Ning Z, Daoud W, Brimblecombe P. Investigation on the mechanism of non-photocatalytically TiO2 -induced reactive oxygen species and its significance on cell cycle and morphology. J Appl Toxicol 2016; 36:1355-63. [PMID: 27191363 DOI: 10.1002/jat.3341] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 03/29/2016] [Accepted: 03/31/2016] [Indexed: 12/12/2022]
Abstract
Titanium dioxide (TiO2 ) nanoparticles are widely used in daily human life, and were reported to elicit biological effects such as oxidative stress either generating reactive oxygen species (ROS) or causing cell necrosis without generating ROS, whose underlying molecular mechanisms are not yet known. In this study, the role of dissolved oxygen in TiO2 catalytic activity in dark environment, and long-term cytotoxic effects of TiO2 exposure were investigated. To determine the effect of dissolved oxygen, the anatase-TiO2 nanoparticle suspension was prepared both in deoxygenated and regular MilliQ water, and a ~ 9-fold higher ROS in regular MilliQ samples was observed compared to deoxygenated samples while in the dark, which suggested dissolved oxygen as the driving agent behind the TiO2 catalytic reaction. On the other hand, the differential cell viability and endogenous ROS activity was demonstrated through a sensitive macrophage-based assay, on a dose- and time-dependent manner. Both the cell number and endogenous ROS activity increased with increase in time till 48 h, followed by a reduction at 72 h exposure period. Long-term exposures to these nanoparticles even at low concentrations were found detrimental to cells, where late apoptosis until 48 h and necrosis at 72 h leading to cell death were noted. Late apoptotic events and cell membrane cytoskeletal actin rearrangement observed were hypothesized to be induced by particle-mediated cellular ROS. This in addition to radical generation ability of TiO2 in the dark will help further in better understanding of the toxicity mechanism in cells beyond ROS generation. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Nirmal Kumar Gali
- School of Energy & Environment, City University of Hong Kong, Hong Kong, SAR
| | - Zhi Ning
- School of Energy & Environment, City University of Hong Kong, Hong Kong, SAR
| | - Walid Daoud
- School of Energy & Environment, City University of Hong Kong, Hong Kong, SAR
| | - Peter Brimblecombe
- School of Energy & Environment, City University of Hong Kong, Hong Kong, SAR
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Selvamani T, Gnana Sundara Raj B, Anandan S, Wu JJ, Ashokkumar M. Synthesis of morphology-controlled bismutite for selective applications. Phys Chem Chem Phys 2016; 18:7768-79. [DOI: 10.1039/c5cp07523h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Bismutite (Bi2O2CO3) possessing diverse morphologies, namely, nanosheets, nanodiscs and nanoplatelets, was synthesized by a simple controllable method shows excellent materials as adsorbents and photocatalysts for wastewater treatment with supercapacitor activities for energy applications.
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Affiliation(s)
- Thangavel Selvamani
- Nanomaterials and Solar Energy Conversion Lab
- Department of Chemistry
- National Institute of Technology
- Tiruchirappalli-620 015
- India
| | | | - Sambandam Anandan
- Nanomaterials and Solar Energy Conversion Lab
- Department of Chemistry
- National Institute of Technology
- Tiruchirappalli-620 015
- India
| | - Jerry J. Wu
- Department of Environmental Engineering and Science
- Feng Chia University
- Taichung 407
- Taiwan
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Abd-Elaal A, Parrino F, Ciriminna R, Loddo V, Palmisano L, Pagliaro M. Alcohol-Selective Oxidation in Water under Mild Conditions via a Novel Approach to Hybrid Composite Photocatalysts. ChemistryOpen 2015; 4:779-85. [PMID: 27308204 PMCID: PMC4906505 DOI: 10.1002/open.201500110] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Indexed: 11/08/2022] Open
Abstract
The oxidation of alcohols to carbonyl compounds in a clean fashion (i.e., with water as a solvent or under solvent‐free conditions, and using O2 or H2O2 as the primary oxidant) is the subject of considerable research efforts. A new approach for the selective oxidation of soluble aromatic alcohols in water under mild conditions via a novel composite photocatalyst has been developed. The catalyst is synthesized by grafting 4‐(4‐(4‐hydroxyphenylimino)cyclohexa‐2,5dienylideneamino)phenol and silver nanoparticles onto the surface of moderately crystalline titanium dioxide. The titanium dioxide‐based composite was first extensively characterized and then employed in the catalytic oxidation of 4‐methoxybenzyl alcohol to 4‐methoxybenzaldehyde under UV irradiation in water at room temperature. The corresponding aldehyde was obtained with unprecedented high selectivity (up to 86 %). The method is general and opens the route to fabrication of photocatalytic composites based on titanium dioxide functionalized with shuttle organic molecules and metal nanoparticles for a variety of oxidative conversions.
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Affiliation(s)
- Ali Abd-Elaal
- Egyptian Petroleum Research Institute 1 Ahmed El-Zomor St. 11727 Cairo Egypt; "Schiavello-Grillone" Photocatalysis Group DEIM Università degli Studi di Palermoviale delle Scienze 90128 Palermo Italy; Istituto per lo Studio dei Materiali Nanostrutturati CNR Via U. La Malfa 153-90146 Palermo Italy
| | - Francesco Parrino
- "Schiavello-Grillone" Photocatalysis Group DEIM Università degli Studi di Palermo viale delle Scienze 90128 Palermo Italy
| | - Rosaria Ciriminna
- Istituto per lo Studio dei Materiali Nanostrutturati CNR Via U. La Malfa 153-90146 Palermo Italy
| | - Vittorio Loddo
- "Schiavello-Grillone" Photocatalysis Group DEIM Università degli Studi di Palermo viale delle Scienze 90128 Palermo Italy
| | - Leonardo Palmisano
- "Schiavello-Grillone" Photocatalysis Group DEIM Università degli Studi di Palermo viale delle Scienze 90128 Palermo Italy
| | - Mario Pagliaro
- Istituto per lo Studio dei Materiali Nanostrutturati CNR Via U. La Malfa 153-90146 Palermo Italy
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Natarajan TS, Bajaj HC, Tayade RJ. Preferential adsorption behavior of methylene blue dye onto surface hydroxyl group enriched TiO 2 nanotube and its photocatalytic regeneration. J Colloid Interface Sci 2014; 433:104-114. [DOI: 10.1016/j.jcis.2014.07.019] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 07/10/2014] [Accepted: 07/13/2014] [Indexed: 10/25/2022]
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Shi H, Chen C, Tang B, Zhao G. Photoelectrochemical Enantioselective Recognition of Amino Acid Enantiomers on (001) Facet TiO 2 Surface. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.08.135] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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15
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Wu Q, Yang X, Liu J, Nie X, Huang Y, Wen Y, Khan J, Khan WU, Wu M, An T. Topotactic growth, selective adsorption, and adsorption-driven photocatalysis of protonated layered titanate nanosheets. ACS APPLIED MATERIALS & INTERFACES 2014; 6:17730-17739. [PMID: 25233252 DOI: 10.1021/am5041847] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Layered titanates with selective adsorption ability and adsorption-driven photocatalytic property can be quite attractive due to their potential applications in water purification. In this work, lepidocrocite-like layered protonated titanate (H2Ti2O5·H2O, denoted as HTO) nanosheets were successfully synthesized by an ion-exchange process. It turns out that this layered structure displays an abundant and selective adsorption toward the fluoroquinolone pharmaceutical compared with some large dye molecules due to a size selectivity of the interlayer spacing of HTO and the molecular horizontal size, as well as their electrostatic interaction. The uptake ability of HTO could be readily controlled through adjusting the pH values of adsorbate solution, and the maximum uptake capacity was achieved at the pH value of about 5.5 for ciprofloxacin (CIP) and 6.5 for moxifloxacin (MOX). The adsorption amount of smaller nalidixic acid (NAL) showed an increasing tendency as the pH value decreased. Moreover, the two-dimensional layered crystal structure also permits such HTO nanosheets to have a large percentage of (010) faces exposed, which is considerably provided by the interlayer surfaces of these nanosheets. The (010) surface has a similar Ti and O atomic arrangement as to the highly reactive anatase TiO2(001) one. Due to these specific characteristics, these HTO nanosheets show excellent photocatalytic activity in degrading CIP under UV light irradiation as well as possess a superior adsorption ability to remove CIP from aqueous solution selectively and efficiently. The photocatalytic reaction is believed to be mainly conducted on the active anatase (001)-like interlayer (010) surfaces of the layered structures since the as-prepared HTO performs an adsorption-driven molecular recognitive photocatalytic reaction.
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Affiliation(s)
- Qili Wu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technology, Key Laboratory of Environment and Energy Chemistry of Guangdong Higher Education Institutes, School of Chemistry and Chemical Engineering, Sun Yat-Sen (Zhongshan) University , Guangzhou 510275, P. R. China
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Abazari R, Mahjoub AR, Sanati S. A facile and efficient preparation of anatase titania nanoparticles in micelle nanoreactors: morphology, structure, and their high photocatalytic activity under UV light illumination. RSC Adv 2014. [DOI: 10.1039/c4ra10018b] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Comparative photocatalysis degradation of MB dye under ultraviolet light irradiation: (a) without photocatalyst; (b) commercial P25 TiO2 powder; and (c) TiO2 nanoparticles.
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Affiliation(s)
- Reza Abazari
- Department of Chemistry
- Tarbiat Modares University
- Tehran, Iran
| | | | - Soheila Sanati
- Department of Chemistry
- Faculty of Basic Sciences
- Azarbaijan Shahid Madani University
- Tabriz, Iran
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Pakdel E, Daoud WA. Self-cleaning cotton functionalized with TiO2/SiO2: Focus on the role of silica. J Colloid Interface Sci 2013; 401:1-7. [DOI: 10.1016/j.jcis.2013.03.016] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Revised: 01/28/2013] [Accepted: 03/04/2013] [Indexed: 11/29/2022]
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Chai S, Zhao G, Zhang YN, Wang Y, Nong F, Li M, Li D. Selective photoelectrocatalytic degradation of recalcitrant contaminant driven by an n-P heterojunction nanoelectrode with molecular recognition ability. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:10182-10190. [PMID: 22920667 DOI: 10.1021/es3021342] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
With in situ molecular imprinting technique, a novel nanoelectrode (MI, n-P)-TiO(2) with n-P heterojunction and molecular recognition ability was fabricated by liquid phase deposition at low temperature. Using bisphenol A (BPA) as template, the spindle-like TiO(2) particles 40-80 nm in size compactly grew on the boron-doped diamond (BDD) substrate. Several spectroscopy measurements demonstrate that the BPA molecules were successfully imprinted on the TiO(2) matrix and numerous specific recognition sites to template were formed after calcination. The transient photocurrent response experiments have confirmed that the (MI, n-P)-TiO(2) nanoelectrode displays outstanding photoelectrocatalytic (PEC) activity and selectivity. The (MI, n-P)-TiO(2) is further employed in degrading the mixture containing BPA and interference 2-naphthol (2-NP). After 2 h, BPA removal reaches 97%, and corresponding kinetic constant is 1.76 h(-1), which is 4.6 times that of 2-NP removal even if 2-NP is much more concentrated. On the electrode without molecular imprint, the removal rate constants of BPA and 2-NP approximately equal, only about 0.5 h(-1). The results indicate that selective PEC oxidation can be realized readily on the (MI, n-P)-TiO(2) nanoelectrode due to the synergetic effects including strong recognition adsorption, formation of n-P heteojunction, and external electrostatic field. The effect of formation of n-P heterojunction on the enhanced PEC performances is also discussed.
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Affiliation(s)
- Shouning Chai
- Department of Chemistry, Tongji University, Shanghai, China
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Martins de Souza e Silva J, Pastorello M, Strauss M, Maroneze CM, Sigoli FA, Gushikem Y, Mazali IO. Size controlled synthesis of highly dispersed anatase/rutile nanoparticles with photocatalytic activity toward salicylic acid degradation. RSC Adv 2012. [DOI: 10.1039/c2ra20453c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Liu X, Pan L, Lv T, Sun Z, Sun C. Sol–gel synthesis of Au/N–TiO2 composite for photocatalytic reduction of Cr(vi). RSC Adv 2012. [DOI: 10.1039/c2ra01107g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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