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Noble Metal Promoted TiO2 from Silver-Waste Valorisation: Synergism between Ag and Au. Catalysts 2022. [DOI: 10.3390/catal12020235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Wastewaters from precious metal industries contain high amounts of noble metals, but their efficient recycling is hindered by the wastewater complex composition. Here, we propose an innovative approach for the efficient recovery of noble metals contained in these metal-enriched wastewaters as precursors for the synthesis of noble metal nanoparticles (NPs) and supported metal catalysts. Silver NPs were synthesized from Ag-enriched wastewater and then deposited on TiO2 to prepare photocatalysts. Then, further promotion of the photocatalytic activity of Ag-modified TiO2 was achieved by the addition of as little as 0.5 wt.% of Au. STEM-EDS analyses proved that Au NPs were located on Ag or AgOx nanoparticles. The contact between the two metal-containing NPs results in charge transfer effects, appreciable both in terms of oxidation states determined by XPS and of optical properties. In particular, the plasmon band of Au NPs shows photochromic effects: under UV light irradiation, bimetallic samples exhibit a blue-shift of the plasmon band, which is reversible under dark storage. The activity of the materials was tested towards ethanol photodegradation under UV light. Adding 0.5 wt.% Au NPs resulted in a promoted activity compared to Ag-TiO2, thus showing synergistic effects between Au and Ag. Ethanol was completely converted already after 1 h of UV irradiation, acetaldehyde was formed as the main oxidation product and fully degraded in less than 180 min. Notably, bimetallic samples showed ethylene formation by a parallel dehydration mechanism.
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2
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Cheng W, Guo C, Ke Q, Guo Y. Heavy Metal Ions in Wastewater Affect the Photodegradation of Phenol‐4‐sulfonic Acid over Biphasic TiO
2
/Activated Carbon Fiber Composites. ChemistrySelect 2021. [DOI: 10.1002/slct.202100296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wu‐Kui Cheng
- The Education Ministry Key Lab of Resource Chemistry Shanghai Key Laboratory of Rare Earth Functional Materials Shanghai Normal University Shanghai 200234 PR China
| | - Cui‐Xiang Guo
- The Education Ministry Key Lab of Resource Chemistry Shanghai Key Laboratory of Rare Earth Functional Materials Shanghai Normal University Shanghai 200234 PR China
| | - Qin‐Fei Ke
- School of Materials Science and Engineering Shanghai Institute of Technology Shanghai 201418 China
| | - Ya‐Ping Guo
- The Education Ministry Key Lab of Resource Chemistry Shanghai Key Laboratory of Rare Earth Functional Materials Shanghai Normal University Shanghai 200234 PR China
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3
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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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4
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Shen JH, Li MM, Chu LF, Guo CX, Guo YJ, Guo YP. Effect mechanism of copper ions on photocatalytic activity of TiO 2/graphene oxide composites for phenol-4-sulfonic acid photodegradation. J Colloid Interface Sci 2021; 586:563-575. [PMID: 33190833 DOI: 10.1016/j.jcis.2020.10.121] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 10/24/2020] [Accepted: 10/27/2020] [Indexed: 11/25/2022]
Abstract
Organic pollutants in electroplating wastewater can be removed by photodegradation, however the effect mechanism of heavy metal ions on photocatalytic activity still remains unknown. Herein, we firstly reported the self-assembly synthesis of titanium dioxide/reduced graphene oxide (TiO2/rGO) composites for phenol-4-sulfonic acid (PSA) removal, and investigated the effects of Cu2+ ions on photocatalytic efficiency. During the self-assemble process, rGO nanosheets were connected together to form network macropores, and simultaneously induced the deposition of hierarchically nanostructured TiO2 microspheres. The synergetic effects of TiO2 microspheres and rGO nanosheets improved the photocatalytic activity by enhancing light adsorption ability, stabilizing electron-hole separation and decreasing band gap energy. The Cu2+ ions in wastewater showed positive and negative effects on PSA photodegradation. In the photocatalytic reaction, the electron-induced reduction reaction of Cu(II) into Cu(0) or Cu(I) took place, which inhibited electron-hole recombination and thus enhanced photocatalytic activity. However, the high chemical stability of PSA-Cu(II) complex compounds held back PSA photodegradation. The appropriate concentrations of Cu2+ ions at around 25 mg/L accelerated PSA photodegradation over TiO2/rGO composites. The PSA degradation into CO2 and H2O was performed by using hydroquinone, benzoquinone and maleic acid as degradation intermediates. Hence, TiO2/rGO composites are novel multifunctional photocatalysts to purify electroplating wastewater.
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Affiliation(s)
- Jia-Hao Shen
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, PR China
| | - Miao-Miao Li
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, PR China
| | - Lian-Feng Chu
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, PR China
| | - Cui-Xiang Guo
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, PR China
| | - Ya-Jun Guo
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, PR China
| | - Ya-Ping Guo
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, PR China.
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5
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Bismuth Oxyhalides for NOx Degradation under Visible Light: The Role of the Chloride Precursor. Catalysts 2021. [DOI: 10.3390/catal11010081] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Photocatalysis is a green technology for tackling water and air contamination. A valid alternative to the most exploited photocatalytic material, TiO2, is bismuth oxyhalides, which feature a wider bandgap energy range and use visible radiation to attain photoexcitation. Moreover, their layered structure favors the separation of photogenerated electron–hole pairs, with an enhancement in photocatalytic activity. Controlled doping of bismuth oxyhalides with metallic bismuth nanoparticles allows for further boosting of the performance of the material. In the present work, we synthesized Y%Bi-doped BiO(Cl0.875Br0.125) (Y = 0.85, 1, 2, 10) photocatalysts, using cetyltrimethylammonium bromide as the bromide source and varying the chloride source to assess the impact that both length and branching of the hydrocarbon chain might have on the framing and layering of the material. A change in the amount of the reducing agent NaBH4 allowed tuning of the percentage of metallic bismuth. After a thorough characterization (XRPD, SEM, TEM, UV-DRS, XPS), the photocatalytic activity of the catalysts was tested in the degradation of NOx under visible light, reaching a remarkable 53% conversion after 3 h of illumination for the material prepared using cetylpyridinium chloride.
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Li Q, Li FT. Recent advances in surface and interface design of photocatalysts for the degradation of volatile organic compounds. Adv Colloid Interface Sci 2020; 284:102275. [PMID: 32987294 DOI: 10.1016/j.cis.2020.102275] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/18/2020] [Accepted: 09/19/2020] [Indexed: 02/03/2023]
Abstract
Photocatalysis has attracted wide attention in eliminating volatile organic compounds (VOCs). This paper pays attention to the relationship between structure and performance of photocatalysts based on the fact that catalytic reactions arise on the surface of catalysts and the interface structure of photocatalysts plays key role in transfer efficiency of charges carriers. This review summarizes various surface/interface designs including unsaturated coordination such as oxygen vacancies, surface halogenations, and heterojunctions, homojunctions, facets, etc., as well as the application in photocatalytic degradation of VOCs. This paper reviews the influence of surface and interface properties of materials on VOCs molecules, effective strategies to promote the decomposition of VOCs from the perspectives of VOCs activation, reaction barrier etc., and presents various methods of photocatalyst design appropriately. The degradation path of highly toxic benzene VOCs are also summarized. In addition, the possible problems and suggestions for photocatalytic degradation of VOCs are proposed.
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Affiliation(s)
- Qi Li
- College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China
| | - Fa-Tang Li
- College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China; School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
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7
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Bianchi CL, Cerrato G, Pirola C, Galli F, Capucci V. Photocatalytic porcelain grés large slabs digitally coated with AgNPs-TiO 2. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:36117-36123. [PMID: 31020536 DOI: 10.1007/s11356-019-05218-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 04/16/2019] [Indexed: 06/09/2023]
Abstract
TiO2 is employed as both photocatalytic and structural materials, leading to its applications in external coatings or in interior furnishing devices, including cement mortar, tiles, floorings, and glass supports. The authors have already demonstrated the efficiency of photoactive micro-sized TiO2 and here its industrial use is reported using the digital printing to coat porcelain grés slabs. Many advantages are immediately evident, namely rapid and precise deposition, no waste of raw materials, thus positively affecting the economy of the process. Data for the thin films deposited by digital printing were compared with those obtained for the conventional spray method. The use of metal-doped TiO2 is also reported so that the photoactivity of these materials can be exploited even under LED light. The digital inkjet printed coatings exhibited superior photocatalytic performance owing to both higher exposed surface area and greater volume of deposited anatase, as well as the greater areal distribution density of thinly and thickly coated regions. Moreover, the presence of TiO2 doped silver increased the efficiency of the materials in NOx degradation both under UVA and LED lights.
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Affiliation(s)
- Claudia L Bianchi
- Dipartimento di Chimica, Università di Milano, Via Golgi 19, 20133, Milano, Italy.
| | - Giuseppina Cerrato
- Dipartimento di Chimica & NIS Interdept. Centre, Università di Torino, Via P. Giuria 7, 10125, Torino, Italy
| | - Carlo Pirola
- Dipartimento di Chimica, Università di Milano, Via Golgi 19, 20133, Milano, Italy
| | - Federico Galli
- Dipartimento di Chimica, Università di Milano, Via Golgi 19, 20133, Milano, Italy
| | - Valentino Capucci
- IrisCeramica Group, Via Ghiarola Nuova 119, 41042, Fiorano M.se (MO), Italy
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8
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Shvalagin V, Ermokhina N, Romanovska N, Barakov R, Manorik P, Sapsay V, Shcherbakov S, Poddubnaya O, Puziy A. Mesoporous TiO2 microspheres with improved efficiency for photooxidation of volatile organic compounds. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-03896-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Schieppati D, Galli F, Peyot ML, Yargeau V, Bianchi CL, Boffito DC. An ultrasound-assisted photocatalytic treatment to remove an herbicidal pollutant from wastewaters. ULTRASONICS SONOCHEMISTRY 2019; 54:302-310. [PMID: 30712858 DOI: 10.1016/j.ultsonch.2019.01.027] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 01/11/2019] [Accepted: 01/21/2019] [Indexed: 05/08/2023]
Abstract
Pollutants of emerging concern contaminate surface and ground water. Advanced oxidation processes treat these molecules and degrade them into smaller compounds or mineralization products. However, little information on coupled advanced oxidation techniques and on the degradation pathways of these pollutants is available to identify possible ecotoxic subproducts. In the present work, we investigate the ultrasound assisted photocatalytic degradation pathway of the herbicide Isoproturon. We worked in batch mode in a thermostatic glass reactor. We compared the activity of nanometric TiO2 P25 with that of Kronos 1077, a micrometric TiO2. We discuss the individual, additive and synergistic degradation action of photolysis, sonolysis, sonophotolysis, and sonophotocatalysis by varying catalyst loading and/or ultrasound power for the last three techniques. With 0.1 g L-1 catalyst, photocatalysis and sonophotopcatalysis completely degrade Isoproturon within 240 min and 60 min, respectively (>99% conversion). Sonophotocatalysis breaks Isoproturon down into smaller molecules than photocatalysis alone.
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Affiliation(s)
- D Schieppati
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy; Department of Chemical Engineering, Polytechnique Montréal, C.P. 6079, Succ. CV Montréal, H3C 3A7 Québec, Canada
| | - F Galli
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy.
| | - M-L Peyot
- Department of Chemical Engineering, McGill University, 3610 University St., Montréal, H3A 2B2 Québec, Canada
| | - V Yargeau
- Department of Chemical Engineering, McGill University, 3610 University St., Montréal, H3A 2B2 Québec, Canada
| | - C L Bianchi
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy
| | - D C Boffito
- Department of Chemical Engineering, Polytechnique Montréal, C.P. 6079, Succ. CV Montréal, H3C 3A7 Québec, Canada
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Cerrato G, Bianchi CL, Galli F, Pirola C, Morandi S, Capucci V. Micro-TiO 2 coated glass surfaces safely abate drugs in surface water. JOURNAL OF HAZARDOUS MATERIALS 2019; 363:328-334. [PMID: 30321837 DOI: 10.1016/j.jhazmat.2018.09.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 09/20/2018] [Accepted: 09/21/2018] [Indexed: 06/08/2023]
Abstract
The ingredients of Pharmaceuticals and Personal Care Products (PPCPs) persist in water and conventional treatment plants are not able to remove them efficiently. Sonochemical treatment is insufficient to mineralize organics such as ibuprofen into CO2 and H2O. TiO2 degrades ibuprofen (IBP) under UV light; however, it does not reach a high grade of conversion. Here, we investigated the mineralization of ibuprofen to CO2 by TiO2 UV-C photocatalysis. We replaced nano-sized P25 (the standard catalyst) with a micro-sized commercial sample of TiO2 to preclude the use of nanoparticles which are dangerous for human health and because typical filtration systems are expensive and inefficient. We deposited micro-TiO2 on glass Raschig rings to ensure an easy recovery and reuse of the photocatalyst and we studied its performance both with a batch and a continuous reactor. Micro-TiO2 mineralized 100% of IBP in 24 h. TiO2-coated glass Raschig rings degraded 87% of IBP in 6 h of UV-C irradiation in a continuous reactor, with a mineralization of 25%. Electronspray ionization mass spectrometer (ESI-MS, positive mode) analyses identified 13 different byproducts and we hypothised a degradration pathway for IBP degradation.
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Affiliation(s)
- G Cerrato
- Università degli Studi di Torino, Dip. Chimica & NIS Interdept. Centre, via P. Giuria 7, 10125 Torino, Italy; INSTM - Consorzio Interuniversitario per la scienza e tecnologia dei Materiali, via G. Giusti 9, 50121 Firenze, Italy.
| | - C L Bianchi
- Università degli Studi di Milano, Dipartimento di Chimica, via Golgi 19, 20133 Milano, Italy; INSTM - Consorzio Interuniversitario per la scienza e tecnologia dei Materiali, via G. Giusti 9, 50121 Firenze, Italy
| | - F Galli
- Università degli Studi di Milano, Dipartimento di Chimica, via Golgi 19, 20133 Milano, Italy; INSTM - Consorzio Interuniversitario per la scienza e tecnologia dei Materiali, via G. Giusti 9, 50121 Firenze, Italy
| | - C Pirola
- Università degli Studi di Milano, Dipartimento di Chimica, via Golgi 19, 20133 Milano, Italy; INSTM - Consorzio Interuniversitario per la scienza e tecnologia dei Materiali, via G. Giusti 9, 50121 Firenze, Italy
| | - S Morandi
- Università degli Studi di Torino, Dip. Chimica & NIS Interdept. Centre, via P. Giuria 7, 10125 Torino, Italy; INSTM - Consorzio Interuniversitario per la scienza e tecnologia dei Materiali, via G. Giusti 9, 50121 Firenze, Italy
| | - V Capucci
- GranitiFiandre SpA, 41042 Fiorano M.se, Italy
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Nano-MnO₂ Decoration of TiO₂ Microparticles to Promote Gaseous Ethanol Visible Photoremoval. NANOMATERIALS 2018; 8:nano8090686. [PMID: 30177654 PMCID: PMC6164255 DOI: 10.3390/nano8090686] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 08/27/2018] [Accepted: 08/31/2018] [Indexed: 11/17/2022]
Abstract
TiO₂-based photocatalysis under visible light is an attractive way to abate air pollutants. Moreover, developing photocatalytic materials on a large-scale requires safe and low-cost precursors. Both high-performance TiO₂ nanopowders and visible-light active noble metals do not match these requirements. Here, we report the design of novel Mn-decorated micrometric TiO₂ particles. Pigmentary TiO₂ replaced unsafe nano-TiO₂ and firmly supported MnOx particles. Mn replaced noble metals such as Au or Ag, opening the way for the development of lower cost catalysts. Varying Mn loading or pH during the impregnation affected the final activity, thus giving important information to optimize the synthesis. Photocatalytic activity screening occurred on the gas-phase degradation of ethanol as a reference molecule, both under ultraviolet (UV) (6 h) and Light Emitting Diode (LED) (24 h) irradiation. Mn-doped TiO₂ reached a maximum ethanol degradation of 35% under visible light after 24 h for the sample containing 20% of Mn. Also, we found that an acidic pH increased both ethanol degradation and mineralization to CO₂, while an alkaline pH drastically slowed down the reaction. A strict correlation between photocatalytic results and physico-chemical characterizations of the synthesized powders were drawn.
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12
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Temperature-Program Assisted Synthesis of Novel Z-Scheme CuBi₂O₄/ β-Bi₂O₃ Composite with Enhanced Visible Light Photocatalytic Performance. NANOMATERIALS 2018; 8:nano8080579. [PMID: 30060581 PMCID: PMC6116239 DOI: 10.3390/nano8080579] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/22/2018] [Accepted: 07/26/2018] [Indexed: 11/16/2022]
Abstract
Novel Z-Scheme CuBi2O4/β-Bi2O3 composite photocatalysts with different mass ratios and calcination temperatures were firstly synthesized by the hydrothermal method following a temperature-programmed process. The morphology, crystal structure, and light absorption properties of the as-prepared samples were systematically characterized, and the composites exhibited enhanced photocatalytic activity toward diclofenac sodium (DS) degradation compared with CuBi2O4 and β-Bi2O3 under visible light irradiation. The optimal photocatalytic efficiency of the composite, achieved at the mass ratio of CuBi2O4 and β-Bi2O3 of 1:2.25 and the calcination temperature of 600 °C is 92.17%. After the seventh recycling of the composite, the degradation of DS can still reach 82.95%. The enhanced photocatalytic activity of CuBi2O4/β-Bi2O3 is closely related to OH•, h+ and O2•−, and the photocatalytic mechanism of CuBi2O4/β-Bi2O3 can be explained by the Z-Scheme theory.
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Bianchi CL, Sacchi B, Capelli S, Pirola C, Cerrato G, Morandi S, Capucci V. Micro-sized TiO 2 as photoactive catalyst coated on industrial porcelain grès tiles to photodegrade drugs in water. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:20348-20353. [PMID: 28452026 DOI: 10.1007/s11356-017-9066-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 04/19/2017] [Indexed: 06/07/2023]
Abstract
Pharmaceutical compounds and their metabolites raise worrying questions because of their continuous release and lack of efficient removal by conventional wastewater treatments; therefore, they are being detected in groundwater, surface water and drinking water in increasing concentrations. Paracetamol and aspirin are two of the most commonly used drugs employed as fever reducer, analgesic and anti-inflammatory. They and their metabolites are very often found in river water, so their degradation is necessary in order to render water suitable for human consumption. The present work is focused on the comparison of the photocatalytic performance of industrial active grés porcelain tiles covered with a commercial micro-sized TiO2 by industrial process using either conventional spray deposition or innovative digital printing methods. The photodegradation of two commonly used drugs, namely aspirin and paracetamol, was investigated both individually and as a mixture, in both deionized and tap water. The results reveal the full conversion of the drugs and the significant role of the photocatalytic tiles in the mineralization processes leading to harmless inorganic species. In particular, the digitally printed tiles exhibited better photodegradation performance for both drugs compared to the spray deposited tiles. No deactivation was observed on both photocatalytic tiles.
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Affiliation(s)
- Claudia L Bianchi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy.
- Consorzio INSTM, Via Giusti 9, 50121, Florence, Italy.
| | - Benedetta Sacchi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy
- Consorzio INSTM, Via Giusti 9, 50121, Florence, Italy
| | - Sofia Capelli
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy
| | - Carlo Pirola
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy
- Consorzio INSTM, Via Giusti 9, 50121, Florence, Italy
| | - Giuseppina Cerrato
- Consorzio INSTM, Via Giusti 9, 50121, Florence, Italy
- Dipartimento di Chimica & NIS, Inter-departmental Centre, Università degli Studi di Torino, Via Giuria 7, 10125, Torino, Italy
| | - Sara Morandi
- Consorzio INSTM, Via Giusti 9, 50121, Florence, Italy
- Dipartimento di Chimica & NIS, Inter-departmental Centre, Università degli Studi di Torino, Via Giuria 7, 10125, Torino, Italy
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14
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Stucchi M, Elfiad A, Rigamonti M, Khan H, Boffito DC. Water treatment: Mn-TiO 2 synthesized by ultrasound with increased aromatics adsorption. ULTRASONICS SONOCHEMISTRY 2018; 44:272-279. [PMID: 29680612 DOI: 10.1016/j.ultsonch.2018.01.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/16/2018] [Accepted: 01/26/2018] [Indexed: 05/20/2023]
Abstract
Pharma-products are mostly single or multiple cyclic compounds. They pollute surface water and are persistent in the aquatic ecosystem. When irradiated by UV light, TiO2 catalysts cleave or degrade organic contaminants in water. Removal of organics by photocatalysis results from a synergistic effect of adsorption and photocatalysis. Synthesis of catalysts by ultrasound (US) produces high surface area and porous solids. Here, we synthesized Mn-doped TiO2 with a US-assisted sol-gel method. Compared to the classical synthesis, US increased the BET surface area from 83 m2 g-1 to 90 m2 g-1 in the Mn-TiO2 sample and from 9.0 m2 g-1 to 53 m2 g-1 in the control TiO2. Accordingly, acetaminophen and amoxicillin adsorption increased from 44% to 52%, and from 34% to 94% for the Mn-TiO2 obtained in absence and presence of US, respectively. When in a mixture, the two drugs strongly compete for adsorption on TiO2.
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Affiliation(s)
- M Stucchi
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada
| | - A Elfiad
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada; Université des Sciences et de la Technologie Houari Boumediene, Department of Applied Organic Chemistry, BP 32 El Alia, 16111 Bab Ezzouar, Alger, Algeria
| | - M Rigamonti
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada
| | - H Khan
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada
| | - D C Boffito
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada.
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Rigamonti MG, Song Y, Li H, Saadatkhah N, Sauriol P, Patience GS. Influence of atomization conditions on spray drying lithium iron phosphate nanoparticle suspensions. CAN J CHEM ENG 2018. [DOI: 10.1002/cjce.23106] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Marco G. Rigamonti
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Yu‐Xiang Song
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - He Li
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Nooshin Saadatkhah
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Pierre Sauriol
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Gregory S. Patience
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
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16
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Photo-induced reduction of Cr6+ by the hybrid systems “CuII complex with Schiff base and TiO2”: dependence on irradiation wavelength. Russ Chem Bull 2018. [DOI: 10.1007/s11172-017-1981-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Photocatalytic Activity of Mesoporous Titanium Dioxide Stabilized with Lanthanum in the Gas-Phase Oxidation of Ethanol. THEOR EXP CHEM+ 2018. [DOI: 10.1007/s11237-018-9537-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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18
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Stucchi M, Galli F, Bianchi CL, Pirola C, Boffito DC, Biasioli F, Capucci V. Simultaneous photodegradation of VOC mixture by TiO 2 powders. CHEMOSPHERE 2018; 193:198-206. [PMID: 29131978 DOI: 10.1016/j.chemosphere.2017.11.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 10/31/2017] [Accepted: 11/01/2017] [Indexed: 06/07/2023]
Abstract
Volatile and semi volatile organic compounds' concentration have dramatically increased in indoor environments in recent years. UV light promotes titanium dioxide, which oxidises various molecules; however, most of the studies report the degradation of a single VOC. Here, we investigate the photo-oxidation of 17 molecules in mixture to have a realistic test of TiO2 efficacy. We compare P25, a nanometric catalyst, and 1077, a micrometric sample, that poses less health concerns. A proton-transfer-reaction mass spectrometer measured online the concentration of all the pollutants simultaneously. Aldehydes compete for the adsorption on both the catalyst's active sites and thus they degrade 70% and 55% with P25 and 1077 respectively. Considering the single pollutant oxidation, instead, aldehydes fully oxidize. Even though benzene is recalcitrant to degradation, P25 and 1077 reduced toluene's concentration to 97% and 96% in 55 min, respectively. Acetonitrile is refractory to photocatalysis.
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Affiliation(s)
- Marta Stucchi
- Polytechnique Montréal, Département de Génie Chimique, 2900 Edouard Montpetit Blvd, H3C 3A4 Montrèal (QC), Canada
| | - Federico Galli
- Polytechnique Montréal, Département de Génie Chimique, 2900 Edouard Montpetit Blvd, H3C 3A4 Montrèal (QC), Canada.
| | - Claudia L Bianchi
- Università di Milano, Dipartimento di Chimica, Via Golgi 19, 20133 Milano, Italy
| | - Carlo Pirola
- Università di Milano, Dipartimento di Chimica, Via Golgi 19, 20133 Milano, Italy
| | - Daria C Boffito
- Polytechnique Montréal, Département de Génie Chimique, 2900 Edouard Montpetit Blvd, H3C 3A4 Montrèal (QC), Canada
| | - Franco Biasioli
- Research & Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele a/A, Italy
| | - Valentino Capucci
- GranitiFiandre SpA, Via Ghiarola Nuova 119, 42014 Castellarano, Italy
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19
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Su J, Yang G, Cheng C, Huang C, Xu H, Ke Q. Hierarchically structured TiO2/PAN nanofibrous membranes for high-efficiency air filtration and toluene degradation. J Colloid Interface Sci 2017; 507:386-396. [DOI: 10.1016/j.jcis.2017.07.104] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 07/25/2017] [Accepted: 07/28/2017] [Indexed: 12/22/2022]
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20
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Li M, Lu B, Ke QF, Guo YJ, Guo YP. Synergetic effect between adsorption and photodegradation on nanostructured TiO 2/activated carbon fiber felt porous composites for toluene removal. JOURNAL OF HAZARDOUS MATERIALS 2017; 333:88-98. [PMID: 28342359 DOI: 10.1016/j.jhazmat.2017.03.019] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 03/04/2017] [Accepted: 03/08/2017] [Indexed: 05/24/2023]
Abstract
The low quantum efficiency and limited adsorption efficiency of TiO2 makes it only fit for the removal of VOCs with low concentrations. Herein, we for the first time fabricated nanostructured TiO2/activated carbon fiber felt (TiO2/ACFF) porous composites by the in situ deposition of TiO2 microspheres on the carbon fibers in ACFF. Interestingly, the TiO2 microspheres exhibit hierarchical nanostructures constructed by nanocrystals as building blocks. The TiO2/ACFF porous composites possess excellent adsorption and photodegradation properties for toluene because of the synergetic effects between the nanostructured TiO2 and ACFF. The adsorption efficiencies of the TiO2/ACFF porous composites reach approximately 98% at the toluene concentration (<1150ppm) and approximately 77% even at the high concentration of 6900ppm. Moreover, the ACFF in the TiO2/ACFF porous composites significantly enhances photocatalytic property for toluene by hindering the recombination of electron-hole pairs, reducing the TiO2 band gap energy (Eg) to 2.95eV and accelerating toluene adsorption. At the toluene concentrations of 230ppm and 460ppm, the photocatalytic oxidation efficiency of toluene into CO2 arrives at 100% and 81.5%, respectively. Therefore, the TiO2/ACFF porous composites with synergetic adsorption and photocatalytic activities have great potentials for toluene removal.
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Affiliation(s)
- Min Li
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
| | - Bin Lu
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
| | - Qin-Fei Ke
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
| | - Ya-Jun Guo
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
| | - Ya-Ping Guo
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China.
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21
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Bianchi CL, Sacchi B, Pirola C, Demartin F, Cerrato G, Morandi S, Capucci V. Aspirin and paracetamol removal using a commercial micro-sized TiO 2 catalyst in deionized and tap water. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:12646-12654. [PMID: 27770326 DOI: 10.1007/s11356-016-7781-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 09/26/2016] [Indexed: 06/06/2023]
Abstract
Micro-sized TiO2 catalyst was employed to degrade pharmaceutical compounds, i.e. aspirin and paracetamol, two of the most widely used drugs, purchasable without prescription. Their active agents, acetylsalicylic acid and acetaminophen, are characterized by different substituent groups, linked to the aromatic ring, which affect both the photodegradation and mineralization processes. The experimental conditions highlight the relationship between the nature of the pristine molecules, their degradation mechanisms, their mutual interference and the water's role. The research started from model systems with a single pollutant to the mixture of them and finally by moving from deionized water to tap water.
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Affiliation(s)
- Claudia L Bianchi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy
- Consorzio INSTM, via Giusti 9, 50121, Florence, Italy
| | - Benedetta Sacchi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy.
- Consorzio INSTM, via Giusti 9, 50121, Florence, Italy.
| | - Carlo Pirola
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy
- Consorzio INSTM, via Giusti 9, 50121, Florence, Italy
| | - Francesco Demartin
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milan, Italy
| | - Giuseppina Cerrato
- Consorzio INSTM, via Giusti 9, 50121, Florence, Italy
- Dipartimento di Chimica and NIS, Inter-departmental Centre, Università degli Studi di Torino, Via Giuria 7, 10125, Torino, Italy
| | - Sara Morandi
- Consorzio INSTM, via Giusti 9, 50121, Florence, Italy
- Dipartimento di Chimica and NIS, Inter-departmental Centre, Università degli Studi di Torino, Via Giuria 7, 10125, Torino, Italy
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