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Boumad S, Cano-Casanova L, Román-Martínez MC, Bouchenafa-Saib N, Lillo-Ródenas MA. Removal of malachite green from water: Comparison of adsorption in a residue-derived AC versus photocatalytic oxidation with TiO 2 and study of the adsorption-photocatalysis synergy. ENVIRONMENTAL RESEARCH 2024; 250:118510. [PMID: 38387495 DOI: 10.1016/j.envres.2024.118510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 02/09/2024] [Accepted: 02/15/2024] [Indexed: 02/24/2024]
Abstract
The literature rarely compiles studies devoted to the removal of pollutants in aqueous media comparing adsorption and photocatalytic degradation, and does not pay enough attention to the analysis of combined adsorption-photocatalytic oxidation processes. In the present manuscript, the removal of malachite green (MG) from aqueous solutions has been investigated in three different sustainable scenarios: i) adsorption on activated carbon (AC) derived from a residue, luffa cylindrica, ii) photocatalytic oxidation under simulated solar light using titanium dioxide (TP) and iii) combined adsorption-photocatalytic oxidation using TP-AC (70/30 wt./wt.) under simulated solar light. The study has revealed that in the three scenarios and studied conditions, the total removal of this endocrine-disrupting dye from the solution takes place in the assayed time, 2 h, in some cases just in a few minutes. MG adsorption in the AC is a very fast and efficient removal method. MG photocatalytic oxidation with TP also occurs efficiently, although the oxidized MG is not totally mineralized. MG removal using the TP-AC composite under simulated solar light occurs only slightly faster to the MG adsorption in the AC, being adsorption the dominating MG removal mechanism for TP-AC. Thus, more than 90% of the removed MG with TP-AC under simulated solar light is adsorbed in this carbon-containing composite. The obtained results highlight the interest in adsorption, being the selection of the most suitable removal method dependent on several factors (i.e., the cost of the AC regeneration, for adsorption, or the toxicity of the intermediate oxidation species, for photooxidation). Paying attention to MG photooxidation with TiO2, comparison of two working photodegradation schemes shows that the direct photodegradation of MG from solution, avoiding any initial dark equilibrium period, is more efficient from a time perspective. The use of scavengers has proved that MG photodegradation occurs via an oxidation mechanism dominated by superoxide anion radicals.
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Affiliation(s)
- S Boumad
- MCMA Group, Department of Inorganic Chemistry and Materials Institute (IUMA), University of Alicante, Ap. 99, E-03080 Alicante, Spain; Université Blida 1, Laboratoire de Chimie Physique des Interfaces des Matériaux Appliquées à l'Environnement, Faculté de Technologie, B.P. 270 Route de Soumaa, 09000 Blida, Algeria
| | - L Cano-Casanova
- MCMA Group, Department of Inorganic Chemistry and Materials Institute (IUMA), University of Alicante, Ap. 99, E-03080 Alicante, Spain
| | - M C Román-Martínez
- MCMA Group, Department of Inorganic Chemistry and Materials Institute (IUMA), University of Alicante, Ap. 99, E-03080 Alicante, Spain
| | - N Bouchenafa-Saib
- Université Blida 1, Laboratoire de Chimie Physique des Interfaces des Matériaux Appliquées à l'Environnement, Faculté de Technologie, B.P. 270 Route de Soumaa, 09000 Blida, Algeria
| | - M A Lillo-Ródenas
- MCMA Group, Department of Inorganic Chemistry and Materials Institute (IUMA), University of Alicante, Ap. 99, E-03080 Alicante, Spain.
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Photocatalytic degradation of the organophosphorus insecticide chlorpyrifos in aqueous suspensions using a novel activated carbon ZrO2-ZnO nanocomposite under UV light. KOREAN J CHEM ENG 2023. [DOI: 10.1007/s11814-022-1354-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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3
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Du T, Cui M, Chao Y, Xiao Y, Ren Z, An Y, Meng C. Preparation and photocatalytic properties of highly dispersed samarium vanadate nanoparticles supported on H-mordenite composites by template-free method. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Ichipi EO, Tichapondwa SM, Chirwa EM. Plasmonic effect and bandgap tailoring of Ag/Ag2S doped on ZnO nanocomposites for enhanced visible-light photocatalysis. ADV POWDER TECHNOL 2022. [DOI: 10.1016/j.apt.2022.103596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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CO2 Reduction to Valuable Chemicals on TiO2-Carbon Photocatalysts Deposited on Silica Cloth. Catalysts 2021. [DOI: 10.3390/catal12010031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A new photocatalyst for CO2 reduction has been presented. The photocatalyst was prepared from a combination of a commercial P25 with a mesopore structure and carbon spheres with a microporous structure with high CO2 adsorption capacity. Then, the obtained hybrid TiO2-carbon sphere photocatalysts were deposited on a glass fiber fabric. The combined TiO2-carbon spheres/silica cloth photocatalysts showed higher efficiency in the two-electron CO2 reduction towards CO than in the eight-electron reaction to methane. The 0.5 g graphitic carbon spheres combined with 1 g of TiO2 P25 resulted in almost 100% selectivity to CO. From a practical point of view, this is promising as it economically eliminates the need to separate CO from the gas mixture after the reaction, which also contains CH4 and H2.
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Madhavi C, Ganja H, Kerru N, Maddila S, Jonnalagadda SB. Synthesis of a sustainable heterogeneous catalyst, titanium dioxide‐loaded hydroxyapatite for functionalised chromen‐dihydropyridines under green conditions. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Challa Madhavi
- Department of Chemistry, GITAM Institute of Sciences GITAM University Visakhapatnam India
| | - Himavathi Ganja
- Department of Chemistry, GITAM Institute of Sciences GITAM University Visakhapatnam India
| | - Nagaraju Kerru
- Department of Chemistry, GITAM School of Science GITAM University, Bengaluru Campus Doddaballapura India
| | - Suresh Maddila
- Department of Chemistry, GITAM Institute of Sciences GITAM University Visakhapatnam India
- School of Chemistry and Physics University of KwaZulu‐Natal, Westville Campus Durban South Africa
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7
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Wang Z, Cai X, Xie X, Li S, Zhang X, Wang Z. Visible-LED-light-driven photocatalytic degradation of ofloxacin and ciprofloxacin by magnetic biochar modified flower-like Bi 2WO 6: The synergistic effects, mechanism insights and degradation pathways. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 764:142879. [PMID: 33129540 DOI: 10.1016/j.scitotenv.2020.142879] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 09/21/2020] [Accepted: 10/04/2020] [Indexed: 05/22/2023]
Abstract
Bi2WO6 possesses good stability but poor photocatalytic activity under visible light. Herein, the coupling of Bi2WO6, Fe3O4 and biochar (Bi2WO6/Fe3O4/BC) was investigated to enhance the photocatalytic performance of Bi2WO6 through facile hydrothermal method, which almost completely degraded ofloxacin (OFL) and ciprofloxacin (CIP) within 30 min under energy-saving visible LED irradiation. The superior photocatalytic activity of Bi2WO6/Fe3O4/BC was ascribed to the stronger visible light adsorption capacity and the lower recombination of electron-hole pairs. O2- played a major role during the photocatalytic reaction. The characterization results suggested that the introduction of biochar avoided the agglomeration of Bi2WO6 microspheres and Fe3O4 nanoparticles, at the same time, the biochar participated in OFL and CIP photodegradation by consuming different oxygen-containing functional groups. In order to further evaluate the application potential of Bi2WO6/Fe3O4/BC, the effects of environment factors and the application in different actual water were carefully investigated. Various transformation products and the possible degradation pathways of OFL and CIP were analyzed based on high resolution mass spectrometry (HRMS) results, moreover, the toxicity evaluation results of Escherichia coli indicated these intermediates products were less toxic compared OFL and CIP. Overall, Bi2WO6/Fe3O4/BC can provide a potential way for the application of photocatalytic technology in ambient wastewater purification.
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Affiliation(s)
- Zirun Wang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China
| | - Xuewei Cai
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China
| | - Xiaoyun Xie
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China.
| | - Shan Li
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China
| | - Xiaoli Zhang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China
| | - Zhaowei Wang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, China
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The combined effectiveness of activated carbon (AC) / ZnO for the adsorption of mebeverine hydrochloride / photocatalytic degradation under sunlight. REACTION KINETICS MECHANISMS AND CATALYSIS 2021. [DOI: 10.1007/s11144-021-01932-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Murillo-Acevedo YS, Giraldo L, Poon PS, Matos J, Moreno-Piraján JC. The Cramer's rule for the parametrization of phenol and its hydroxylated byproducts: UV spectroscopy vs. high performance liquid chromatography. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:6746-6757. [PMID: 33009618 DOI: 10.1007/s11356-020-10897-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
A linear algebra theorem like Cramer's rule was used for the analysis of a system of equations obtained from UV spectroscopy, and results were compared against those obtained from HPLC analysis. This parametrization allowed to quantify the concentration of the main intermediate products detected along the photodegradation of phenol under UV-Vis irradiation of TiO2. UV spectroscopy data for phenol, hydroquinone, and benzoquinone were analyzed using the Cramer's rule. The overlapping interference of the intermediate products in the UV spectra was corrected. It can be concluded that the Cramer's rule can be used for the parametrization of the UV absorbance data of phenol and its main intermediate products. This methodology permitted to obtain the concentration of phenol and their intermediate products by UV-visible with a high precision in comparison of HPLC. The parametrization showed a correlation coefficient of ca. 0.9775 between the phenol concentration obtained by UV spectroscopy and values obtained from HPLC analysis. In this sense, results can be considered with good precision, and accordingly, it can be concluded that the methodology is reliable, and UV-visible spectroscopy can be selected instead of HPLC in much of the experiments concerning with aqueous-phase reactions.
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Affiliation(s)
| | - Liliana Giraldo
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Bogotá, Colombia
| | - Po S Poon
- Unidad de Desarrollo Tecnológico (UDT), Universidad de Concepción, Barrio Universitario s/n, Concepción, Chile
| | - Juan Matos
- Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, 8900000, Santiago, Chile.
| | - Juan C Moreno-Piraján
- Departamento de Química, Facultad de Ciencias, Universidad de los Andes, Bogotá, Colombia.
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Matos J, Poon PS, Montaña R, Romero R, Gonçalves GR, Schettino MA, Passamani EC, Freitas JC. Photocatalytic activity of P-Fe/activated carbon nanocomposites under artificial solar irradiation. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.06.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Garcia-Muñoz P, Fresno F, Lefevre C, Robert D, Keller N. Synergy effect between photocatalysis and heterogeneous photo-Fenton catalysis on Ti-doped LaFeO3 perovskite for high efficiency light-assisted water treatment. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02269d] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Synergy effect between photocatalysis and H2O2-mediated heterogeneous photo-Fenton catalysis on highly robust Ti-substituted La1−xTixFeO3 perovskites led to high performances under UV-A light in water treatment.
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Affiliation(s)
- Patricia Garcia-Muñoz
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS/University of Strasbourg
- Strasbourg
- France
| | - Fernando Fresno
- Photoactivated Processes Unit
- IMDEA Energy Institute. Avda. Ramón de la Sagra, 3
- 28935 Móstoles
- Spain
| | - Christophe Lefevre
- Institut de Physique et de Chimie des Matériaux de Strasbourg (IPCMS)
- CNRS/University de Strasbourg
- Strasbourg
- France
| | - Didier Robert
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS/University of Strasbourg
- Strasbourg
- France
| | - Nicolas Keller
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS/University of Strasbourg
- Strasbourg
- France
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12
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Rico-Santacruz M, García-Muñoz P, Marchal C, Batail N, Pham C, Robert D, Keller N. Coating-free TiO2@β-SiC alveolar foams as a ready-to-use composite photocatalyst with tunable adsorption properties for water treatment. RSC Adv 2020; 10:3817-3825. [PMID: 35492643 PMCID: PMC9048602 DOI: 10.1039/c9ra09553e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 01/03/2020] [Indexed: 01/14/2023] Open
Abstract
Coating-free TiO2@β-SiC photocatalytic composite foams gathered within a ready-to-use shell/core alveolar medium the photocatalytically active TiO2 phase and the β-SiC foam structure were prepared via a multi-step shape memory synthesis (SMS) replica method. They were fabricated following a sequential two-step carburization approach, in which an external TiC skin was synthesized at the surface of a β-SiC skeleton foam obtained from a pre-shaped polyurethane foam during a first carburization step. The adsorption behaviour of the shell/core TiO2@β-SiC composite foams towards the Diuron pollutant in water was tuned by submitting the carbide foams to a final calcination treatment within the 550–700 °C temperature range. The controlled calcination step allowed (i) the selective oxidation of the TiC shell into a TiO2 crystallite shell owing to the β-SiC resistance to oxidation and (ii) the amount of residual unreacted carbon in the foams to be tuned. The lower the calcination temperature, the more pronounced the adsorption profiles of the composites and the higher the Diuron amount removed by adsorption on the residual unreacted carbon. The ready-to-use TiO2@β-SiC composite foams were active in the degradation of the Diuron pesticide, without any further post-synthesis immobilization or synthesis process at the foam surface. They displayed good reusability with test cycles and benefitted from an enhanced stability in terms of the titania release to water. Coating-free TiO2@β-SiC photocatalytic composite foams gathering within a ready-to-use shell/core alveolar medium the TiO2 photocatalyst and the β-SiC foam structure were prepared via a multi-step shape memory synthesis (SMS) replica method.![]()
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Affiliation(s)
- Marisa Rico-Santacruz
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS
- University of Strasbourg
- Strasbourg
- France
| | - Patricia García-Muñoz
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS
- University of Strasbourg
- Strasbourg
- France
| | - Clément Marchal
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS
- University of Strasbourg
- Strasbourg
- France
| | | | | | - Didier Robert
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS
- University of Strasbourg
- Strasbourg
- France
| | - Nicolas Keller
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES)
- CNRS
- University of Strasbourg
- Strasbourg
- France
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13
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Mestre AS, Carvalho AP. Photocatalytic Degradation of Pharmaceuticals Carbamazepine, Diclofenac, and Sulfamethoxazole by Semiconductor and Carbon Materials: A Review. Molecules 2019; 24:molecules24203702. [PMID: 31618947 PMCID: PMC6832631 DOI: 10.3390/molecules24203702] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 10/07/2019] [Accepted: 10/11/2019] [Indexed: 11/16/2022] Open
Abstract
The presence of pharmaceutical compounds in the environment is a reality that calls for more efficient water treatment technologies. Photocatalysis is a powerful technology available but the high energy costs associated with the use of UV irradiation hinder its large scale implementation. More sustainable and cheaper photocatalytic processes can be achieved by improving the sunlight harvesting and the synthesis of semiconductor/carbon composites has proved to be a promising strategy. Carbamazepine, diclofenac, and sulfamethoxazole were selected as target pharmaceuticals due to their recalcitrant behavior during conventional wastewater treatment and persistence in the environment, as properly reviewed. The literature data on the photocatalytic removal of carbamazepine, diclofenac, and sulfamethoxazole by semiconductor/carbon materials was critically revised to highlight the role of the carbon in the enhanced semiconductor performance under solar irradiation. Generally it was demonstrated that carbon materials induce red-shift absorption and they contribute to more effective charge separation, thus improving the composite photoactivity. Carbon was added as a dopant (C-doping) or as support or doping materials (i.e., nanoporous carbons, carbon nanotubes (CNTs), graphene, and derived materials, carbon quantum dots (CQDs), and biochars) and in the large majority of the cases, TiO2 was the semiconductor tested. The specific role of carbon materials is dependent on their properties but even the more amorphous forms, like nanoporous carbons or biochars, allow to prepare composites with improved properties compared to the bare semiconductor. The self-photocatalytic activity of the carbon materials was also reported and should be further explored. The removal and mineralization rates, as well as degradation pathways and toxicity of the treated solutions were also critically analyzed.
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Affiliation(s)
- Ana S Mestre
- Centro de Química e Bioquímica and Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal.
| | - Ana P Carvalho
- Centro de Química e Bioquímica and Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal.
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Huang P, Luan J. Dispersed GaOOH rods loaded on the surface of ZnBiNbO 5 particles with enhanced photocatalytic activity toward enrofloxacin. RSC Adv 2019; 9:32027-32033. [PMID: 35530812 PMCID: PMC9073095 DOI: 10.1039/c9ra06153c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 09/23/2019] [Indexed: 11/21/2022] Open
Abstract
A GaOOH/ZnBiNbO5 composite was constructed by loading dispersed GaOOH rods on the surface of ZnBiNbO5 particles and characterizations, including SEM-EDS, XRD, FT-IR spectroscopy, XPS, and UV-Vis DRS, were performed to analyze the morphology, structure and optical properties of the GaOOH/ZnBiNbO5 composite. The characterization results showed that ZnBiNbO5 was not destroyed by a high temperature and high pressure in the solvothermal process and that GaOOH was successfully dispersed on the surface of ZnBiNbO5. Simultaneously, there was a red-shift of the absorbance edge for GaOOH/ZnBiNbO5 compared with those of pure ZnBiNbO5 and pure GaOOH. The band gaps of ZnBiNbO5, GaOOH and GaOOH/ZnBiNbO5 were calculated to be 2.96 eV, 4.76 eV and 2.93 eV, respectively. The photocatalytic activity of GaOOH/ZnBiNbO5 was explored by degrading enrofloxacin under illumination. After ultraviolet light irradiation for 60 min, the removal rate of enrofloxacin with GaOOH/ZnBiNbO5 as a photocatalyst was 15.11% higher than that of pure ZnBiNbO5 and was 29.29% higher than that of pure GaOOH. In addition, the contribution of the free radicals in the photocatalytic process was confirmed to be ·O2− > ·OH > h+. The construction of the GaOOH/ZnBiNbO5 composite improved the performance of the single ZnBiNbO5 photocatalyst and single GaOOH photocatalyst, thereby increasing their practical application potential. A GaOOH/ZnBiNbO5 composite was constructed by loading dispersed GaOOH rods on the surface of ZnBiNbO5 particles and characterizations, including SEM-EDS, XRD, FT-IR spectroscopy, XPS, and UV-Vis DRS were performed.![]()
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Affiliation(s)
- Panqi Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University Nanjing 210023 People's Republic of China
| | - Jingfei Luan
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University Nanjing 210023 People's Republic of China
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15
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TiO 2/S-Doped Carbons Hybrids: Analysis of Their Interfacial and Surface Features. Molecules 2019; 24:molecules24193585. [PMID: 31590359 PMCID: PMC6804183 DOI: 10.3390/molecules24193585] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 10/02/2019] [Accepted: 10/04/2019] [Indexed: 11/17/2022] Open
Abstract
Hybrids containing approximately equal amounts of P25 TiO2 and S-doped porous carbons were prepared using a water-based slurry mixing method. The materials were extensively characterized by adsorption of nitrogen, potentiometric titration, thermal analysis in air and in helium, XRD, XPS and SEM. The collected results showed the significant blockage of carbon micropores by TiO2 particles deposited on their outer surface. The formation of a new interface, especially for the S-rich samples, might also contribute to the porosity alteration. Analysis of surface chemistry suggested the presence of Ti-S bonds with an involvement of sulfur from thiophenic species in the carbon phase. The latter, especially when polymer-derived, was mainly deposited on the TiO2 nanoparticles. Formation of Ti-S stabilized sulfur and increased the ignition temperature of the hybrids, especially those with a high content of sulfur, in comparison with the ignition temperature of carbons. The surfaces of hybrid with S-containing carbons was also thermally very stable and of basic chemical nature. The formation of interfacial structures Ti-C was detected by XPS analysis suggesting a partial reduction of the Ti.
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16
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Cai FY, Zhang YQ, Wang JT, Zhou JR, Cao HL, Lü J. Mixed phase nano-CdS supported on activated biomass carbon as efficient visible light-driven photocatalysts. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:31055-31061. [PMID: 31456150 DOI: 10.1007/s11356-019-06267-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 08/16/2019] [Indexed: 06/10/2023]
Abstract
Semiconductors are promising photocatalysts for the use of sunlight in energy conversion and environmental remediation. To this end, various synthetic pathways have been proposed to increase their photocatalytic efficiency, catalytic stability, recycle, and reuse. In this work, mixed phase CdS nanoparticles were loaded on the surface of activated biomass carbons to prepare composite photocatalysts via hydrothermal syntheses, which were further applied to photocatalytic degradation of rhodamine B (RhB) under visible irradiation. The composite photocatalysts displayed considerable specific surface area (up to 672 m2 g-1) and suitable band gap energy of ca. 2.1 eV. Due to the excellent light adsorption ability and chemical stability, these composite photocatalysts exhibited excellent photocatalytic capacity toward RhB degradation under visible irradiation. Moreover, the photocatalytic stability was also demonstrated by cyclic experiments, by which the composite photocatalysts retained over 80% of the initial catalytic activity after 4 consecutive runs.
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Affiliation(s)
- Feng-Ying Cai
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Yu-Qing Zhang
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Jun-Tao Wang
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Jun-Ru Zhou
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Hai-Lei Cao
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, 150080, China.
| | - Jian Lü
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
- Samara Center for Theoretical Materials Science (SCTMS), Samara State Technical University, Samara, Russia, 443100
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Kaliraj L, Ahn JC, Rupa EJ, Abid S, Lu J, Yang DC. Synthesis of panos extract mediated ZnO nano-flowers as photocatalyst for industrial dye degradation by UV illumination. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 199:111588. [PMID: 31450132 DOI: 10.1016/j.jphotobiol.2019.111588] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 06/20/2019] [Accepted: 08/08/2019] [Indexed: 12/20/2022]
Abstract
Green synthesis of zinc oxide has gained extensive attention as a reliable, sustainable, and eco-friendly protocol to reduce the destructive effects associated with the traditional synthesis methods commonly utilized in laboratory and industry. Here for the first time, we have synthesized quaker ladies flower type ZnO (ZnO/QNF) from panos extract (extract from four panax plants such as Panax ginseng, Acanthopanax senticosus, Kalopanax septemlobus and Dendropanax morbifera). The synthesized ZnO materials was characterized using powder X-ray diffraction, Fourier infrared spectroscopy, X-ray photoelectron spectroscopy and Transmission electron microscope. The newly synthesized ZnO/QNF was applied for the removal of industrial dyes such as methylene blue (MB), Eosin Y (EY) and Malachite green (MG) under UV illumination. The photocatalyst degraded the 15 mg L-1 MB, EY and MG to >99% within 80, 90 and 110 min of contact time, respectively. In addition, the ZnO/QNF photocatalyst removed the low concentrated 5 mg L-1 of MB, EY, and MG within 30, 35 and 40 min of contact time, respectively. The pedal structure provided all the active sites available for the easy interaction with dye molecule under UV, and that enabled fast kinetics of dye degradation than the many other benchmark materials reported previously. The ZnO photocatalyst could be reused minimum of five cycles without any significant loss in degradation efficiency.
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Affiliation(s)
- Lalitha Kaliraj
- Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Jong Chan Ahn
- Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Esrat Jahan Rupa
- Department of Oriental Medicinal Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Suleman Abid
- Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Jing Lu
- Department of Oriental Medicinal Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Deok Chun Yang
- Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea; Department of Oriental Medicinal Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea.
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19
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Rieß J, Lublow M, Anders S, Tasbihi M, Acharjya A, Kailasam K, Thomas A, Schwarze M, Schomäcker R. XPS studies on dispersed and immobilised carbon nitrides used for dye degradation. Photochem Photobiol Sci 2019; 18:1833-1839. [DOI: 10.1039/c9pp00144a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photocatalysis is able to degrade dyes. We could trace the active species with XPS measurements.
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Affiliation(s)
- Julian Rieß
- Technische Universität Berlin
- Department of Chemistry
- 10623 Berlin
- Germany
| | - Michael Lublow
- Technische Universität Berlin
- Department of Chemistry
- 10623 Berlin
- Germany
| | - Steven Anders
- Technische Universität Berlin
- Department of Chemistry
- 10623 Berlin
- Germany
| | - Minoo Tasbihi
- Technische Universität Berlin
- Department of Chemistry
- 10623 Berlin
- Germany
| | - Amitava Acharjya
- Technische Universität Berlin
- Department of Chemistry
- 10623 Berlin
- Germany
| | | | - Arne Thomas
- Technische Universität Berlin
- Department of Chemistry
- 10623 Berlin
- Germany
| | - Michael Schwarze
- Technische Universität Berlin
- Department of Chemistry
- 10623 Berlin
- Germany
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20
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Adamu H, Shand M, Taylor RSF, Manyar HG, Anderson JA. Use of carbon-based composites to enhance performance of TiO 2 for the simultaneous removal of nitrates and organics from aqueous environments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:32001-32014. [PMID: 30215209 DOI: 10.1007/s11356-018-3120-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Accepted: 08/31/2018] [Indexed: 06/08/2023]
Abstract
The simultaneous photocatalytic removal of nitrate from aqueous environment in presence of organic hole scavenger using TiO2 has long been explored. However, the use of unmodified TiO2 in such reaction resulted in non-performance or release of significant amount of undesirable reaction products in the process, a problem that triggered surface modification of TiO2 for enhanced photocatalytic performance. Previous studies focused on decreasing rate of charge carrier recombination and absorption of light in the visible region. Yet, increasing active sites and adsorption capacity by combining TiO2 with a high surface area adsorbent such as activated carbon (AC) remains unexploited. This study reports the potential of such modification in simultaneous removal of nitrates and oxalic acid in aqueous environment. The adsorptive behaviour of nitrate and oxalic acid on TiO2 and TiO2/AC composites were studied. The Langmuir adsorption coefficient for nitrate was four times greater than that of oxalic acid. However, the amount of oxalic acid adsorbed was about 10 times greater than the amount of nitrate taken up. Despite this advantage, the materials did not appear to produce more active photocatalysts for the simultaneous degradation of nitrate and oxalic acid. The photocatalytic activity of TiO2 and its carbon-based composites was improved by combination with Cu2O particles. Consequently, 2.5 Cu2O/TiO2 exhibited the maximum photocatalytic performance with 57.6 and 99.8% removal of nitrate and oxalic acid, respectively, while selectivity stood at 45.7, 12.4 and 41.9% for NH4+, NO2- and N2, respectively. For the carbon based, 2.5 Cu2O/TiO2-20AC showed removal of 12.7% nitrate and 80.3% oxalic acid and achieved 21.6, 0 and 78.4% selectivity for NH4+, NO2- and N2, respectively. Using the optimal AC loading (20 wt%) resulted in significant decrease in the selectivity for NH4+ with no formation of NO2-, which unveils that selectivity for N2 and low/no selectivity for undesirable products can be manipulated by controlling the rate of consumption of oxalic acid. In contract, no nitrate reduction was observed with Cu2O promoted TiO2-T and its TiO2-(T)-20AC, which may be connected to amorphous nature of TiO2-T and perhaps served as charge carrier trapping sites that impeded activity.
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Affiliation(s)
- Haruna Adamu
- Surface Chemistry and Catalysis Group, Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK.
- Department of Environmental Management Technology, Abubakar Tafawa Balewa University, Bauchi, Nigeria.
- Department of Chemistry, Abubakar Tafawa Balewa University, Bauchi, Nigeria.
| | - Mikaela Shand
- Surface Chemistry and Catalysis Group, Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK
| | - Rebecca S F Taylor
- School of Chemical Engineering and Analytical Science, The University of Manchester, The Mill,Sackville Street, Manchester, M13 9PL, UK
| | - Haresh G Manyar
- CenTACat, School of Chemistry and Chemical Engineering, Queen's University, Belfast, David Keir Building, Stranmillis Road, Belfast, BT9 5AG, UK
| | - James A Anderson
- Surface Chemistry and Catalysis Group, Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK
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Vaiano V, Sacco O, Matarangolo M. Photocatalytic degradation of paracetamol under UV irradiation using TiO2-graphite composites. Catal Today 2018. [DOI: 10.1016/j.cattod.2018.02.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Bandosz TJ, Ania CO. Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1800293. [PMID: 30250787 PMCID: PMC6145414 DOI: 10.1002/advs.201800293] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/13/2018] [Indexed: 05/20/2023]
Abstract
Even though, owing to the complexity of nanoporous carbons' structure and chemistry, the origin of their photoactivity is not yet fully understood, the recent works addressed here clearly show the ability of these materials to absorb light and convert the photogenerated charge carriers into chemical reactions. In many aspects, nanoporous carbons are similar to graphene; their pores are built of distorted graphene layers and defects that arise from their amorphicity and reactivity. As in graphene, the photoactivity of nanoporous carbons is linked to their semiconducting, optical, and electronic properties, defined by the composition and structural defects in the distorted graphene layers that facilitate the exciton splitting and charge separation, minimizing surface recombination. The tight confinement in the nanopores is critical to avoid surface charge recombination and to obtain high photochemical quantum yields. The results obtained so far, although the field is still in its infancy, leave no doubts on the possibilities of applying photochemistry in the confined space of carbon pores in various strategic disciplines such as degradation of pollutants, solar water splitting, or CO2 mitigation. Perhaps the future of photovoltaics and smart-self-cleaning or photocorrosion coatings is in exploring the use of nanoporous carbons.
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Affiliation(s)
- Teresa J. Bandosz
- Department of Chemistry and BiochemistryThe City College of New YorkNew YorkNY10031USA
- CUNY Energy CenterThe City College of New YorkNew YorkNY10031USA
| | - Conchi O. Ania
- CEMHTICNRS (UPR 3079)Univ. Orleans4571OrléansFrance
- Instituto Nacional del Carbon (INCAR)CSIC33011OviedoSpain
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Matos J, Llano B, Montaña R, Poon PS, Hidalgo MC. Design of Ag/ and Pt/TiO 2-SiO 2 nanomaterials for the photocatalytic degradation of phenol under solar irradiation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:18894-18913. [PMID: 29717427 DOI: 10.1007/s11356-018-2102-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 04/23/2018] [Indexed: 06/08/2023]
Abstract
The design of hybrid mesoporous TiO2-SiO2 (TS1) materials decorated with Ag and Pt nanoparticles was performed. The photocatalytic degradation of phenol under artificial solar irradiation was studied and the activity and selectivity of the intermediate products were verified. TiO2-SiO2 was prepared by sol-gel method while Ag- and Pt-based photocatalysts (TS1-Ag and TS1-Pt) were prepared by photodeposition of the noble metals on TS1. Two series of photocatalysts were prepared varying Ag and Pt contents (0.5 and 1.0 wt%). An increase in the photocatalytic activity up to two and five times higher than TS1 was found on TS1-Ag-1.0 and TS1-Pt-1.0, respectively. Changes in the intermediate products were detected on Ag- and Pt-based photocatalysts with an increase in the catechol formation up to 3.3 and 6.6 times higher than that observed on TS1, respectively. A two-parallel reaction mechanism for the hydroquinone and catechol formation is proposed. A linear correlation between the photocatalytic activity and the surface concentration of noble metals was found indicating that the electron affinity of noble metals is the driven force for both the increase in the photoactivity and for the remarkable changes in the selectivity of products.
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Affiliation(s)
- Juan Matos
- Hybrid and Carbon Materials Group, Bioenergy Department, Technological Development Unit (UDT), University of Concepcion, Av. Cordillera, 2634, Parque Industrial Coronel, Coronel, Bio Bio, Chile.
| | - Biviana Llano
- Grupo Procesos Químicos Industriales, Facultad de Ingeniería, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.
| | - Ricmary Montaña
- Hybrid and Carbon Materials Group, Bioenergy Department, Technological Development Unit (UDT), University of Concepcion, Av. Cordillera, 2634, Parque Industrial Coronel, Coronel, Bio Bio, Chile
| | - Po S Poon
- Hybrid and Carbon Materials Group, Bioenergy Department, Technological Development Unit (UDT), University of Concepcion, Av. Cordillera, 2634, Parque Industrial Coronel, Coronel, Bio Bio, Chile
| | - Maria C Hidalgo
- Instituto de Ciencia de Materiales de Sevilla (ICMS), Centro Mixto CSIC-Universidad de Sevilla, C/Américo Vespucio 49, 41092, Sevilla, Spain
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Farhadian N, Behin J. Degradation of 2,4-dichlorophenoxyacetate isopropyl amine (2,4-D IPA) by O 3/AC/UV in an internally slurry airlift photo-reactor. ENVIRONMENTAL TECHNOLOGY 2017; 38:3180-3191. [PMID: 28162046 DOI: 10.1080/09593330.2017.1291757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An externally illuminated slurry airlift reactor (ALR) was used to decompose 2,4-dichlorophenoxyacetate isopropyl amine during catalytic ozonation with activated carbon. The effect of superficial gas velocity (0.05-0.15 cm/s), UVAB irradiation (0-60 W), treatment period (10-30 min) and amount of activated carbon (0-0.8 g/l) on removal efficiency was investigated using response surface methodology (RSM) based on the Box-Behnken surface statistical design. Well-defined circulation pattern in the ALR allowed all the fluid elements to be exposed to high light intensity zone and achieve sufficient contact between the solid catalyst and the pollutant. Treatment period appeared as the most influential variable followed by the amount of activated carbon, superficial gas velocity and UV irradiation. A kinetic study was also carried out to evaluate the degradation efficiency versus the O3, O3/AC, O3/UV and O3/AC/UV combinations in which the last one had the highest impact. Efficient suspensions of AC in the ALR resulted in the high efficiency of the O3/AC system. No significant difference was observed between the overall kinetic constants determined in O3/AC and O3/AC/UV systems due to the light transmission obstacle of solid suspension.
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Affiliation(s)
- Negin Farhadian
- a Advanced Chemical Engineering Research Centre, Faculty of Petroleum and Chemical Engineering , Razi University , Kermanshah , Iran
| | - Jamshid Behin
- a Advanced Chemical Engineering Research Centre, Faculty of Petroleum and Chemical Engineering , Razi University , Kermanshah , Iran
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25
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El-Salamony RA, Amdeha E, Ghoneim SA, Badawy NA, Salem KM, Al-Sabagh AM. Titania modified activated carbon prepared from sugarcane bagasse: adsorption and photocatalytic degradation of methylene blue under visible light irradiation. ENVIRONMENTAL TECHNOLOGY 2017; 38:3122-3136. [PMID: 28278770 DOI: 10.1080/21622515.2017.1290148] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Activated carbon (AC), prepared from sugarcane bagasse waste through a low-temperature chemical carbonization treatment, was used as a support for nano-TiO2. TiO2 supported on AC (xTiO2-AC) catalysts (x = 10, 20, 50, and 70 wt.%) were prepared through a mechano-mixing method. The photocatalysts were characterized by Raman, X-ray diffraction analysis, FTIR, SBET, field emission scanning electron microscope, and optical technique. The adsorption and photo-activity of the prepared catalysts (xTiO2-AC) were evaluated using methylene blue (MB) dye. The photocatalytic degradation of MB was evaluated under UVC irradiation and visible light. The degradation percentage of the 100 ppm MB at neutral pH using 20TiO2-AC reaches 96 and 91 after 180 min under visible light and UV irradiation, respectively. In other words, these catalysts are more active under visible light than under UV light irradiation, opening the possibility of using solar light for this application.
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Affiliation(s)
- R A El-Salamony
- a Egyptian Petroleum Research Institute (EPRI) , Nasr City , Cairo , Egypt
| | - E Amdeha
- a Egyptian Petroleum Research Institute (EPRI) , Nasr City , Cairo , Egypt
| | - S A Ghoneim
- a Egyptian Petroleum Research Institute (EPRI) , Nasr City , Cairo , Egypt
| | - N A Badawy
- b Department of Chemistry, Faculty of Science , Al-Azhar University , Nasr City , Cairo , Egypt
| | - K M Salem
- b Department of Chemistry, Faculty of Science , Al-Azhar University , Nasr City , Cairo , Egypt
| | - A M Al-Sabagh
- a Egyptian Petroleum Research Institute (EPRI) , Nasr City , Cairo , Egypt
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Han W, Li Z, Li Y, Fan X, Zhang F, Zhang G, Peng W. The Promoting Role of Different Carbon Allotropes Cocatalysts for Semiconductors in Photocatalytic Energy Generation and Pollutants Degradation. Front Chem 2017; 5:84. [PMID: 29164101 PMCID: PMC5674929 DOI: 10.3389/fchem.2017.00084] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 10/06/2017] [Indexed: 11/13/2022] Open
Abstract
Semiconductor based photocatalytic process is of great potential for solving the fossil fuels depletion and environmental pollution. Loading cocatalysts for the modification of semiconductors could increase the separation efficiency of the photogenerated hole-electron pairs, enhance the light absorption ability of semiconductors, and thus obtain new composite photocatalysts with high activities. Kinds of carbon allotropes, such as activated carbon, carbon nanotubes, graphene, and carbon quantum dots have been used as effective cocatalysts to enhance the photocatalytic activities of semiconductors, making them widely used for photocatalytic energy generation, and pollutants degradation. This review focuses on the loading of different carbon allotropes as cocatalysts in photocatalysis, and summarizes the recent progress of carbon materials based photocatalysts, including their synthesis methods, the typical applications, and the activity enhancement mechanism. Moreover, the cocatalytic effect among these carbon cocatalysts is also compared for different applications. We believe that our work can provide enriched information to harvest the excellent special properties of carbon materials as a platform to develop more efficient photocatalysts for solar energy utilization.
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Affiliation(s)
| | | | | | | | - Fengbao Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | | | - Wenchao Peng
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
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Efektivitas Fotodegradasi Amoksisilin yang Dikatalisis dengan TiO2 dengan Keberadaan Ion Ag(I). JURNAL KIMIA SAINS DAN APLIKASI 2017. [DOI: 10.14710/jksa.20.3.105-109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Pemakaian obat dan sediaannya secara intensif, selain memberikan keuntungan dalam pelayanan kesehatan juga memiliki efek sekunder yaitu akumulasi limbah yang tidak diinginkan. Akumulasi zat antibiotik seperti amoksisilin di perairan dapat menyebabkan resistensi. Di lingkungan, limbah amoksisilin dapat bersama-sama dengan limbah anorganik seperti ion Ag(I). Kajian tentang fotodegradasi dilakukan dengan menggabungkan cahaya ultraviolet dan partikel semikonduktor sebagai fotokatalis. Hal tersebut dilakukan untuk mengetahui pengaruh penyinaran, keberadaan ion Ag(I), dan kondisi optimum terhadap efektivitas fotodegradasi amoksisilin yang dikatalisis TiO2dengan kehadiran ion Ag(I). Proses fotodegradasi amoksisilin dilakukan dalam suatu reaktor tertutup dilengkapi dengan satu set alat pengaduk magnetik dan lampu UV. Hasil kemudian dianalisis dengan Spektrofotometer UV untuk mengetahui konsentrasi amoksisilin sisa dan Spektrofotometer Serapan Atom (SSA) untuk mengetahui konsentrasi ion Ag(I) sisa. Hasil penelitian menunjukkan bahwa amoksisilin yang terdegradasi meningkat dengan semakin lamanya waktu penyinaran karena lamanya kontak antara fotokatalis TiO2 dengan cahaya dan kontak antara amoksisilin dengan radikal •OH. Keberadaan ion Ag(I) meningkatkan hasil fotodegradasi amoksisilin karena rekombinasi radikal •OH yang berasal dari spesies hole dengan elektron tereksitasi dapat dicegah. Efektivitas fotodegradasi amoksisilin terjadi pada waktu penyinaran 90 menit, larutan amoksisilin 200 mg/L sebanyak 25 mL dengan penambahan ion Ag(I) 40 mg/L sebanyak 25 mL, dan TiO2 sebagai katalis sebanyak 20 mg. Pada kondisi tersebut fotodegradasi amoksisilin sebesar 32,40 % dan persen ion Ag(I) yang tereduksi sebesar 70,40 %.
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Effective coupling of phenol adsorption and photodegradation at the surface of micro-and mesoporous TiO2-activated carbon materials. REACTION KINETICS MECHANISMS AND CATALYSIS 2017. [DOI: 10.1007/s11144-017-1265-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Matos J, Lanfredi S, Montaña R, Nobre MA, de Córdoba MCF, Ania CO. Photochemical reactivity of apical oxygen in KSr2Nb5O15 materials for environmental remediation under UV irradiation. J Colloid Interface Sci 2017; 496:211-221. [DOI: 10.1016/j.jcis.2017.02.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 01/23/2017] [Accepted: 02/12/2017] [Indexed: 10/20/2022]
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30
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Photochemistry of nanoporous carbons: Perspectives in energy conversion and environmental remediation. J Colloid Interface Sci 2017; 490:879-901. [DOI: 10.1016/j.jcis.2016.11.046] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 11/11/2016] [Accepted: 11/14/2016] [Indexed: 11/21/2022]
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31
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Synthesis, Property Characterization and Photocatalytic Activity of the Polyaniline/BiYTi₂O₇ Polymer Composite. Polymers (Basel) 2017; 9:polym9030069. [PMID: 30970757 PMCID: PMC6432484 DOI: 10.3390/polym9030069] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 02/01/2017] [Accepted: 02/09/2017] [Indexed: 11/16/2022] Open
Abstract
A new polyaniline/BiYTi2O7 polymer composite was synthesized by chemical oxidation in-situ polymerization method for the first time. The effect of polyaniline doping on structural and catalytic properties of BiYTi2O7 was reported. The structural properties of novel polyaniline/BiYTi2O7 have been characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV-Vis DRS. The results showed that BiYTi2O7 crystallized well with the pyrochlore-type structure, stable cubic crystal system by space group Fd3m. The lattice parameter or band gap energy of BiYTi2O7 was found to be a = 10.2132 Å or 2.349 eV, respectively. The novel polyaniline/BiYTi2O7 polymer composite possessed higher catalytic activity compared with BiYTi2O7 or nitrogen doped TiO2 for photocatalytic degradation of Azocarmine G under visible light irradiation. Additionally, the Azocarmine G removal efficiency was boosted from 3.0% for undoped BiYTi2O7 to 78.0% for the 10% polyaniline-modified BiYTi2O7, after only 60 min of reaction. After visible light irradiation for 330 min with polyaniline/BiYTi2O7 polymer composite as photocatalyst, complete removal and mineralization of Azocarmine G was observed. The photocatalytic degradation of Azocarmine G followed first-order reaction kinetics. Ultimately, the promoter action of H2O2 for photocatalytic degradation of AG with BiYTi2O7 as catalyst in the wastewater was discovered.
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32
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Photocatalytic degradation of phenol by char/N-TiO 2 and char/N-F-TiO 2 composite photocatalysts. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.03.054] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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Pueyo N, Miguel N, Mosteo R, Ovelleiro JL, Ormad MP. Synergistic effect of the presence of suspended and dissolved matter on the removal of cyanide from coking wastewater by TiO 2 photocatalysis. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2017; 52:182-188. [PMID: 27791477 DOI: 10.1080/10934529.2016.1240493] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This study assesses the influence of the presence of suspended and dissolved matter on the efficiency of TiO2 photocatalysis for the removal of cyanide from coking wastewater. Photocatalytic processes were carried out at basic pH (pH 9) with titanium dioxide (1 g/L), artificial radiation (290-800 nm) and during different time periods (20-100 min). The first assays applied in aqueous solutions achieved promising results in terms of removing cyanide. The maximum cyanide removal obtained in coking wastewater was 89% after 80 min of irradiation in the presence of suspended and dissolved matter. The presence of suspended matter composed of coal improves the efficiency of the photocatalytic process due to the synergistic effect between carbon and TiO2. The absence of dissolved matter also improves the process due to the minimization of the hydroxyl radical scavenging effect produced by carbonate and bicarbonate ions. On the other hand, the presence of certain species in the real matrix such as silicon increases the activity of the titanium dioxide catalyst. In consequence, the improvement achieved by the photocatalytic process for the removal of cyanide in the absence of dissolved matter is counteracted.
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Affiliation(s)
- Noelia Pueyo
- a Department of Chemical Engineering and Environmental Technologies , University of Zaragoza , Zaragoza , Spain
| | - Natividad Miguel
- a Department of Chemical Engineering and Environmental Technologies , University of Zaragoza , Zaragoza , Spain
| | - Rosa Mosteo
- a Department of Chemical Engineering and Environmental Technologies , University of Zaragoza , Zaragoza , Spain
| | - José L Ovelleiro
- a Department of Chemical Engineering and Environmental Technologies , University of Zaragoza , Zaragoza , Spain
| | - María P Ormad
- a Department of Chemical Engineering and Environmental Technologies , University of Zaragoza , Zaragoza , Spain
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Yao J, Zhang Y, Wang Y, Chen M, Huang Y, Cao J, Ho W, Lee SC. Enhanced photocatalytic removal of NO over titania/hydroxyapatite (TiO2/HAp) composites with improved adsorption and charge mobility ability. RSC Adv 2017. [DOI: 10.1039/c7ra02157g] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A 75% TiO2/HAp composite photocatalyst with excellent NO removal efficiency was successfully synthesized. The photocatalytic improvement mechanism was investigated systematically.
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Affiliation(s)
- Jie Yao
- College of Chemistry and Chemical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
- Key Lab of Aerosol Chemistry & Physics
| | - Yufei Zhang
- Key Lab of Aerosol Chemistry & Physics
- Institute of Earth Environment
- Chinese Academy of Sciences
- Xi'an 710061
- China
| | - Yawen Wang
- College of Chemistry and Chemical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Meijuan Chen
- School of Human Settlements and Civil Engineering
- Xi'an jiaotong University
- Xi'an 710049
- China
| | - Yu Huang
- Key Lab of Aerosol Chemistry & Physics
- Institute of Earth Environment
- Chinese Academy of Sciences
- Xi'an 710061
- China
| | - Junji Cao
- Key Lab of Aerosol Chemistry & Physics
- Institute of Earth Environment
- Chinese Academy of Sciences
- Xi'an 710061
- China
| | - Wingkei Ho
- Department of Science and Environmental Studies
- The Education University of Hong Kong
- Hong Kong
- China
| | - Shun Cheng Lee
- Department of Civil and Environmental Engineering
- The Hong Kong Polytechnic University
- Hong Kong
- China
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35
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Chen G, Wang Y, Dai G, Zhang F. Immobilization of flower-like ZnO on activated carbon fibre as recycled photocatalysts. RESEARCH ON CHEMICAL INTERMEDIATES 2016. [DOI: 10.1007/s11164-016-2591-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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Fan J, Zhao Z, Liu W, Xue Y, Yin S. Solvothermal synthesis of different phase N–TiO 2 and their kinetics, isotherm and thermodynamic studies on the adsorption of methyl orange. J Colloid Interface Sci 2016; 470:229-236. [DOI: 10.1016/j.jcis.2016.02.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 02/11/2016] [Accepted: 02/18/2016] [Indexed: 10/22/2022]
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37
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Shi ZL, Guo M, Wang LJ, Yao SH. Preparation, Characterization and Photocatalytic Activity of Fe, La Co-doped Nanometer Titanium Dioxide Photocatalysts. CHINESE J CHEM PHYS 2016. [DOI: 10.1063/1674-0068/29/cjcp1504084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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38
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Xu Q, Zeng J, Li X, Xu J, Liu X. 3D nano-macroporous structured TiO2-foam glass as an efficient photocatalyst for organic pollutant treatment. RSC Adv 2016. [DOI: 10.1039/c6ra08768j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
3D nano-macroporous structured TiO2-foam glass is developed and it shows high photocatalytic activity and stability, which are attributed to the enhanced light utilization efficiency and more reaction sites generated from its 3D structure.
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Affiliation(s)
- Qingchi Xu
- Department of Physics
- Xiamen University
- Xiamen
- P. R. China
- Research Institute for Biomimetics and Soft Matter
| | - Jiaxin Zeng
- Department of Physics
- Xiamen University
- Xiamen
- P. R. China
- Research Institute for Biomimetics and Soft Matter
| | - Xingyun Li
- Department of Physics
- Xiamen University
- Xiamen
- P. R. China
- Research Institute for Biomimetics and Soft Matter
| | - Jun Xu
- Department of Physics
- Xiamen University
- Xiamen
- P. R. China
- Research Institute for Biomimetics and Soft Matter
| | - Xiangyang Liu
- Research Institute for Biomimetics and Soft Matter
- Fujian Provincial Key laboratory for Soft Functional Materials
- Xiamen University
- Xiamen
- P. R. China
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39
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Basha S, Keane D, Nolan K, Oelgemöller M, Lawler J, Tobin JM, Morrissey A. UV-induced photocatalytic degradation of aqueous acetaminophen: the role of adsorption and reaction kinetics. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:2219-2230. [PMID: 25173973 DOI: 10.1007/s11356-014-3411-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Accepted: 08/04/2014] [Indexed: 06/03/2023]
Abstract
Nanostructured titania supported on activated carbon (AC), termed as integrated photocatalytic adsorbents (IPCAs), were prepared by ultrasonication and investigated for the photocatalytic degradation of acetaminophen (AMP), a common analgesic and antipyretic drug. The IPCAs showed high affinity towards AMP (in dark adsorption studies), with the amount adsorbed proportional to the TiO2 content; the highest adsorption was at 10 wt% TiO2. Equilibrium isotherm studies showed that the adsorption followed the Langmuir model, indicating the dependence of the reaction on an initial adsorption step, with maximum adsorption capacity of 28.4 mg/g for 10 % TiO2 IPCA. The effects of initial pH, catalyst amount and initial AMP concentration on the photocatalytic degradation rates were studied. Generally, the AMP photodegradation activity of the IPCAs was better than that of bare TiO2. Kinetic studies on the photocatalytic degradation of AMP under UV suggest that the degradation followed Langmuir-Hinshelwood (L-H) kinetics, with an adsorption rate constant (K) that was considerably higher than the photocatalytic rate constant (k r), indicating that the photocatalysis of AMP is the rate-determining step during the adsorption/photocatalysis process.
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Affiliation(s)
- Shaik Basha
- Discipline of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavagnar, 364002, Gujarat, India
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40
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Matos J, Montaña R, Rivero E. Influence of activated carbon upon the photocatalytic degradation of methylene blue under UV-vis irradiation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:784-791. [PMID: 24788930 DOI: 10.1007/s11356-014-2832-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Accepted: 03/24/2014] [Indexed: 06/03/2023]
Abstract
Photodegradation of methylene blue (MB) was studied on TiO2 in the presence of activated carbon (AC) prepared from the sawdust of a soft wood by physical activation under CO2 flow, by pyrolysis under N2 flow, and by chemical activation with ZnCl2 and H3PO4 under N2 flow. MB photodegradation was performed under UV and UV-visible irradiation to verify the scaling-up of the present TiO2-AC binary materials. It was verified that oxygenated surface groups on carbon were intrinsically photoactive, and a synergy effect between both solids has been estimated from the first-order apparent rate constants in the photodegradation of MB. This effect enhances the photoactivity of TiO2 up to a factor of about 9 under visible irradiation, and it was associated to the surface properties of AC.
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Affiliation(s)
- Juan Matos
- Department of Photocatalysis and Alternative Energies, Venezuelan Institute for Scientific Research (IVIC), 20632, Caracas, 1020-A, Venezuela,
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41
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Rioja N, Benguria P, Peñas FJ, Zorita S. Competitive removal of pharmaceuticals from environmental waters by adsorption and photocatalytic degradation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:11168-11177. [PMID: 24532206 DOI: 10.1007/s11356-014-2593-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 01/23/2014] [Indexed: 06/03/2023]
Abstract
This work explores the competitive removal of pharmaceuticals from synthetic and environmental waters by combined adsorption-photolysis treatment. Five drugs usually present in waterways have been used as target compounds, some are pseudo-persistent pollutants (carbamazepine, clofibric acid, and sulfamethoxazole) and others are largely consumed (diclofenac and ibuprofen). The effect of the light source on adsorption of drugs onto activated carbons followed by photolysis with TiO2 was assessed, being UV-C light the most effective for drug removal in both deionized water and river water. Different composites prepared from titania nanoparticles and powdered activated carbons were tested in several combined adsorption-photocatalysis assays. The composites prepared by calcination at 400 °C exhibited much better performance than those synthesized at 500 °C, being the C400 composite the most effective one. Furthermore, some synthetic waters containing dissolved species and environmental waters were used to investigate the effect of the aqueous matrix on each drug removal. In general, photocatalyst deactivation was found in synthetic and environmental waters. This was particularly evident in the experiments performed with bicarbonate ions as well as with wastewater effluent. In contrast, tests conducted in seawater showed adsorption and photocatalytic degradation yields comparable to those obtained in deionized water. Considering the peculiarities of substrate competition in each aqueous matrix, the combined adsorption-photolysis treatment generally increased the overall elimination of drugs in water.
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Affiliation(s)
- N Rioja
- Tecnalia-Energy and Environment Division, c/ Geldo, Parque Tecnológico de Bizkaia, Edificio 700, 48160, Derio, Spain
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42
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García-Muñoz P, Carbajo J, Faraldos M, Bahamonde A. Photocatalytic degradation of phenol and isoproturon: Effect of adding an activated carbon to titania catalyst. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.05.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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43
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Affiliation(s)
- Michael Dahl
- Department of Chemistry and ‡Materials Science and Engineering Program, University of California at Riverside, Riverside, California 92521, United States
| | - Yiding Liu
- Department of Chemistry and ‡Materials Science and Engineering Program, University of California at Riverside, Riverside, California 92521, United States
| | - Yadong Yin
- Department of Chemistry and ‡Materials Science and Engineering Program, University of California at Riverside, Riverside, California 92521, United States
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44
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Soltani RDC, Rezaee A, Khataee A, Safari M. Photocatalytic process by immobilized carbon black/ZnO nanocomposite for dye removal from aqueous medium: Optimization by response surface methodology. J IND ENG CHEM 2014. [DOI: 10.1016/j.jiec.2013.09.003] [Citation(s) in RCA: 98] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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45
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Karimi MA, Hatefi-Mehrjardi A, Askarpour Kabir A, Zaydabadi M. Synthesis, characterization, and application of MgO/ZnO nanocomposite supported on activated carbon for photocatalytic degradation of methylene blue. RESEARCH ON CHEMICAL INTERMEDIATES 2014. [DOI: 10.1007/s11164-014-1729-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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46
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Yao S, Song S, Shi Z. Adsorption properties and photocatalytic activity of TiO2/activated carbon fiber composite. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2014. [DOI: 10.1134/s0036024414060296] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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47
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Xiao F, Pignatello JJ. Effect of adsorption nonlinearity on the pH-adsorption profile of ionizable organic compounds. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1994-2001. [PMID: 24512326 DOI: 10.1021/la403859u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Solution pH is an important factor in the adsorptive behavior of ionizable organic compounds (IOCs) in many industrial, commercial, and environmental contexts. A linear speciation model (LSM) that assumes the concentration-independent adsorption of charged and neutral species is often employed to model the pH-adsorption profile (edge). Deviations from that model--including the shift of the adsorption edge from its expected inflection point at pH = pK(a) and the appearance of an adsorption maximum ("hump") near the pK(a)--are sometimes used to infer the mechanism. We investigated the adsorption of six organic acids and bases on the nonfunctionalized, extremely low variable-charge surface of graphite. Isotherms at constant pH of both charged and neutral species were usually highly nonlinear, and the adsorption edges typically showed a shift, hump, or both. We postulate that this behavior is due to the gradual extinction of the dissolved neutral or charged species as the pH approaches and then crosses the pK(a). This leads to an increase in the affinity of that species for the solid resulting from the inherent nonlinearity of its isotherm. The extinction of the more strongly adsorbing species mainly causes the shift, whereas the extinction of the less strongly adsorbing species gives rise to the hump. A nonlinear speciation model (NSM) based on Freundlich or Langmuir equations was employed to fit the adsorption edge. The NSM captured both the shift and the hump and was superior to the LSM. Increasing adsorption nonlinearity of the neutral species shifts the adsorption edge in the acidic direction (organic bases) or alkaline direction (organic acids), whereas increasing nonlinearity of the charged species increases the hump size. Both the shift and hump size increase as the difference in adsorption affinity between neutral and charged species decreases. The results show that the concentration dependence alone can strongly affect the shape of pH-adsorption curve and should be taken into account in future modeling.
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Affiliation(s)
- Feng Xiao
- Department of Environmental Sciences, Connecticut Agricultural Experiment Station, New Haven, Connecticut 06504, United States
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48
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Ajmal A, Majeed I, Malik RN, Idriss H, Nadeem MA. Principles and mechanisms of photocatalytic dye degradation on TiO2based photocatalysts: a comparative overview. RSC Adv 2014. [DOI: 10.1039/c4ra06658h] [Citation(s) in RCA: 755] [Impact Index Per Article: 75.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Pictorial representation of all possible dye degradation reaction in UV light initiated indirect dye degradation mechanism. This mechanism is practically more important over visible light initiated direct mechanism.
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Affiliation(s)
- Anila Ajmal
- Department of Environmental Sciences
- Quaid-i-Azam University
- Islamabad 4200, Pakistan
| | - Imran Majeed
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad 4200, Pakistan
| | - Riffat Naseem Malik
- Department of Environmental Sciences
- Quaid-i-Azam University
- Islamabad 4200, Pakistan
| | - Hicham Idriss
- CRI-KAUST
- Saudi Basic Industries Corporation
- Thuwal, Saudi Arabia
| | - Muhammad Amtiaz Nadeem
- Department of Environmental Sciences
- Quaid-i-Azam University
- Islamabad 4200, Pakistan
- CRI-KAUST
- Saudi Basic Industries Corporation
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49
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Flores NM, Pal U, Galeazzi R, Sandoval A. Effects of morphology, surface area, and defect content on the photocatalytic dye degradation performance of ZnO nanostructures. RSC Adv 2014. [DOI: 10.1039/c4ra04522j] [Citation(s) in RCA: 158] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Contributions of morphology, surface area, and defect content, on the photocatalytic activity of ZnO nanostructures have been discussed.
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Affiliation(s)
- Natalia Morales Flores
- Centro de Investigación en Dispositivos Semiconductores
- ICUAP
- Benemérita Universidad Autónoma de Puebla
- Puebla, Mexico
| | - Umapada Pal
- Instituto de Física
- Benemérita Universidad Autónoma de Puebla
- Puebla, Mexico
| | - Reina Galeazzi
- Centro de Investigación en Dispositivos Semiconductores
- ICUAP
- Benemérita Universidad Autónoma de Puebla
- Puebla, Mexico
| | - Alberto Sandoval
- Instituto de Física
- Benemérita Universidad Autónoma de Puebla
- Puebla, Mexico
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50
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Andriantsiferana C, Mohamed EF, Delmas H. Photocatalytic degradation of an azo-dye on TiO2/activated carbon composite material. ENVIRONMENTAL TECHNOLOGY 2014; 35:355-363. [PMID: 24600875 DOI: 10.1080/09593330.2013.828094] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A sequential adsorption/photocatalytic regeneration process to remove tartrazine, an azo-dye in aqueous solution, has been investigated. The aim ofthis work was to compare the effectiveness of an adsorbent/photocatalyst composite-TiO2 deposited onto activated carbon (AC) - and a simple mixture of powders of TiO2 and AC in same proportion. The composite was an innovative material as the photocatalyst, TiO2, was deposited on the porous surface ofa microporous-AC using metal-organic chemical vapour deposition in fluidized bed. The sequential process was composed of two-batch step cycles: every cycle alternated a step of adsorption and a step of photocatalytic oxidation under ultra-violet (365 nm), at 25 degreeC and atmospheric pressure. Both steps, adsorption and photocatalytic oxidation, have been investigated during four cycles. For both materials, the cumulated amounts adsorbed during four cycles corresponded to nearly twice the maximum adsorption capacities qmax proving the photocatalytic oxidation to regenerate the adsorbent. Concerning photocatalytic oxidation, the degree of mineralization was higher with the TiO2/AC composite: for each cycle, the value of the total organic carbon removal was 25% higher than that obtained with the mixture powder. These better photocatalytic performances involved better regeneration than higher adsorbed amounts for cycles 2, 3 and 4. Better performances with this promising material - TiO2 deposited onto AC - compared with TiO2 powder could be explained by the vicinity of photocatalytic and AC adsorption sites.
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Affiliation(s)
- C Andriantsiferana
- Laboratoire de Génie Chimique, UMR CNRS 5503, Université de Toulouse, INP, ENSIACET 4, allée Emile MONSO-BP 84234 - 31432 Toulouse Cedex 4, France.
| | - E F Mohamed
- Department of Air Pollution, National Research Centre, El-Behoos Street, Dokki, Giza, Egypt
| | - H Delmas
- Laboratoire de Génie Chimique, UMR CNRS 5503, Université de Toulouse, INP, ENSIACET 4, allée Emile MONSO-BP 84234 - 31432 Toulouse Cedex 4, France
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