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Mamba FB, Mbuli BS, Ramontja J. Synergistic effect of ZnO/Ag 2O@g-C 3N 4 based nanocomposites embedded in carrageenan matrix for dye degradation in water. Heliyon 2024; 10:e31109. [PMID: 38828361 PMCID: PMC11140603 DOI: 10.1016/j.heliyon.2024.e31109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 05/02/2024] [Accepted: 05/09/2024] [Indexed: 06/05/2024] Open
Abstract
This research achieved success by synthesizing innovative nanocomposite composed of zinc oxide (ZnO), graphitic carbon nitride (g-C3N4) and silver oxide (Ag2O) nanomaterials incorporated into a carrageenan matrix, thus creating an environmentally friendly and stable support structure. The synthesis process involved hydrothermal and chemical precipitation methods to create photocatalytic g-C3N4, ZnO, and Ag2O nanocomposites. The success is evident through the characterization results, which unveiled distinctive peaks corresponding to Zn-O (590-404 cm-1) and Ag-O (2072 cm-1) stretching in the Fourier transform infrared (FTIR) and X-ray diffraction (XRD) analyses, conclusively confirming the successful synthesis of g-C3N4, ZnO, Ag2O, and their respective nanocomposites. Further validation through a scanning electron microscope coupled with an energy dispersive spectrometer (SEM-EDX) and elemental mapping affirmed the presence of Zn, O, Ag, C, and N. Additionally, transmission electron microscope (TEM) imaging unveiled the nanosheet morphology of g-C3N4, the nanorod structure of ZnO, and the spherical form of Ag2O nanomaterials. ZnO and Ag2O nanomaterials demonstrated a consistent 10-20 nm size range. To underscore their ability to harness visible light, the nanomaterials were excited at 380 nm, emitting visible light emission within the 400-450 nm range. The synthesized nanocomposites showcased outstanding adsorption and photocatalytic properties, achieving efficiency ranging from 80 % to 98 %, attributed to the synergistic interactions between the various components. These findings culminate in a confirmation of the research's success, validating the exceptional potential of these nanocomposites for various applications.
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Affiliation(s)
- Feziwe B. Mamba
- Department of Chemical Sciences, Faculty of Science, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa
- DSI/Mintek Nanotechnology Innovation Centre, University of Johannesburg, Doornfontein, 2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein, 2028, South Africa
| | - Bhekani S. Mbuli
- Department of Chemical Sciences, Faculty of Science, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa
- DSI/Mintek Nanotechnology Innovation Centre, University of Johannesburg, Doornfontein, 2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein, 2028, South Africa
| | - James Ramontja
- Department of Chemical Sciences, Faculty of Science, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa
- DSI/Mintek Nanotechnology Innovation Centre, University of Johannesburg, Doornfontein, 2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein, 2028, South Africa
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Sangkhanak S, Kunthakudee N, Hunsom M, Ramakul P, Serivalsatit K, Pruksathorn K. Highly efficient ZnO/WO 3 nanocomposites towards photocatalytic gold recovery from industrial cyanide-based gold plating wastewater. Sci Rep 2023; 13:22752. [PMID: 38123788 PMCID: PMC10733279 DOI: 10.1038/s41598-023-49982-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 12/14/2023] [Indexed: 12/23/2023] Open
Abstract
Discharging the gold-contained wastewater is an economic loss. In this work, a set of ZnO/WO3 was facile synthesized by hydrothermal method in order to recover gold from the industrial cyanide-based gold plating wastewater by photocatalytic process. Effect of ZnO contents coupled with WO3 was first explored. Then, effects of operating condition including initial pH of wastewater, type of hole scavenger, concentration of the best hole scavenger and photocatalyst dose were explored. A series of experimental results demonstrated that the ZnO/WO3 nanocomposite with 5 wt% ZnO (Z5.0/WO3) depicted the highest photocatalytic activity for gold recovery due to the synergetic effect of oxygen vacancies, a well-constructed ZnO/WO3 heterostructure and an appropriate band position alignment with respect to the redox potentials of [Au(CN)2]- and hole scavengers. Via this ZnO/WO3 nanocomposite, approximately 99.5% of gold ions was recovered within 5 h using light intensity of 3.57 mW/cm2, catalyst dose of 2.0 g/L, ethanol concentration of 20 vol% and initial pH of wastewater of 11.2. In addition, high stability and reusability were observed with the best nanocomposite even at the 5th reuse. This work provides the guidance and pave the way for designing the ZnO/WO3 nanocomposite for precious metal recovery from a real industrial wastewater.
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Affiliation(s)
- Satjaporn Sangkhanak
- Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
- Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Phuttamonthon 4 Road, Nakhon Pathom, 73170, Thailand
| | - Naphaphan Kunthakudee
- Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Phuttamonthon 4 Road, Nakhon Pathom, 73170, Thailand
| | - Mali Hunsom
- Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Phuttamonthon 4 Road, Nakhon Pathom, 73170, Thailand.
- Associate Fellow of Royal Society of Thailand (AFRST), Bangkok, 10300, Thailand.
| | - Prakorn Ramakul
- Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom, 73000, Thailand
| | - Karn Serivalsatit
- Department of Materials Science, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
- Photocatalysts for Clean Environment and Energy Research Unit, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Kejvalee Pruksathorn
- Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
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3
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Feng Z, Ning Y, Yang S, Yu J, Ouyang W, Li Y. A novel strategy for arsenic removal from acid wastewater via strong reduction processing. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:43886-43900. [PMID: 36670226 DOI: 10.1007/s11356-022-24919-0] [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: 07/06/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
Due to the high-acidic arsenic-containing wastewater pollution greatly threatening human health and ecological safety, a simple and efficient method for reducing arsenic was proposed in this paper to solve this problem. By using potassium borohydride (KBH4) as a reducing agent, the soluble arsenic was converted into the gaseous arsine (AsH3) or solid arsenic (As0) to achieve the purpose of removing arsenic in wastewater. By exploring the reaction kinetics of the arsenic removal process, it was found that the fast reaction stage (0-2 min) conformed to pseudo-first-order kinetics. The removal rate of arsenic increased to over 73% in 0.5 min, and reaction equilibrium was reached after 30 min. Various influence factors including arsenic valence, aeration, addition method, concentrations of reducing agent, and hydrogen ion (H+) were investigated. The results showed that As(III) was easier to be removed by reduction than As(V), while adding KBH4 in multiples and aeration were both favorable to the removal of arsenic. Increased concentration of KBH4 also enhanced the removal of arsenic. Appropriate H+ concentration contributed to the arsenic removal, but excessive H+ concentration conversely has an inhibitory effect. The maximum removal rate of arsenic was 95.87%, with the maximum removal capacity of 45.50 mg/g. Based on the XRD and SEM-EDS analysis of residue, amorphous arsenic (As0) with a mass ratio of more than 94.52% was generated after the reduction of soluble arsenic. Our study demonstrated that the reaction mechanism of reductive degradation is soluble arsenic with hydrogen radicals (H•) to form arsenic (As0) and arsine (AsH3) (in the molar ratio of 6:1). Although the generated solid arsenic (As0) is convenient for the soluble arsenic removal from wastewater, attention must be paid to the formation of AsH3, and strategies for AsH3 treatment should be considered.
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Affiliation(s)
- Zhi Feng
- School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
| | - Yu Ning
- School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
| | - Sen Yang
- School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
| | - Jinhao Yu
- School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
| | - Weiwei Ouyang
- School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
| | - Yilian Li
- School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
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Hoinkis N, Litter MI. Mechanisms of Sonochemical Transformation of Nitrate and Nitrite under Different Conditions: Influence of Additives and pH. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Nina Hoinkis
- Chemistry Department, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128Mainz, Germany
| | - Marta I. Litter
- Institute of Environmental Research and Engineering−Habitat and Sustainability School, National University of San Martín-CONICET, Campus Miguelete, Av. 25 de Mayo y Francia, 1650San Martín, Provincia de Buenos Aires, Argentina
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5
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Silerio-Vázquez F, Proal Nájera JB, Bundschuh J, Alarcon-Herrera MT. Photocatalysis for arsenic removal from water: considerations for solar photocatalytic reactors. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:61594-61607. [PMID: 34533752 DOI: 10.1007/s11356-021-16507-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 09/07/2021] [Indexed: 06/13/2023]
Abstract
The following work provides a perspective on the potential application of solar heterogeneous photocatalysis, which is a nonselective advanced oxidation process considered as a sustainable technology, to assist in arsenic removal from water, which is a global threat to human health. Heterogeneous photocatalysis can oxidize trivalent arsenic to pentavalent arsenic, decreasing its toxicity and easing its removal with other technologies, such as chemical precipitation and adsorption. Several lab-scale arsenic photocatalytic oxidation and diverse solar heterogeneous photocatalytic operations carried out in different reactor designs are analyzed. It was found out that this technology has not been translated to operational pilot plant scale prototypes. General research on reactors is scarce, comprising a small percentage of the photocatalysis related scientific literature. It was possible to elucidate some operational parameters that a reactor must comply to operate efficiently. Reports on small-scale application shed light that in areas where other water purification technologies are economically and/or technically not suitable, and the solar energy is available, shed light on the fact that solar heterogeneous photocatalysis is highly promissory within a water purification process for removal of arsenic from water.
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Affiliation(s)
- Felipe Silerio-Vázquez
- Departamento de Ingeniería Sustentable, Centro de Investigación en Materiales Avanzados, S.C. Calle CIMAV 110, Colonia 15 de mayo, C.P, 34147, Durango, México
| | - José B Proal Nájera
- Instituto Politécnico Nacional, CIIDIR-Durango, Calle Sigma 119, Fraccionamiento 20 de Noviembre II, C. P, 34220, Durango, México
| | - Jochen Bundschuh
- UNESCO Chair on Groundwater Arsenic within the 2030 Agenda for Sustainable Development, and School of Civil Engineering, Faculty of Health, Engineering and Sciences, University of Southern Queensland, West Street, Toowoomba, Queensland, 4350, Australia
| | - María T Alarcon-Herrera
- Departamento de Ingeniería Sustentable, Centro de Investigación en Materiales Avanzados, S.C. Calle CIMAV 110, Colonia 15 de mayo, C.P, 34147, Durango, México.
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6
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Alias N, Hussain Z, Tan WK, Kawamura G, Muto H, Matsuda A, Lockman Z. Photoreduction of Cr(VI) in wastewater by anodic nanoporous Nb 2O 5 formed at high anodizing voltage and electrolyte temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:60600-60615. [PMID: 35426025 DOI: 10.1007/s11356-022-20005-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 03/27/2022] [Indexed: 06/14/2023]
Abstract
In this study, nanoporous anodic film was produced by anodization of niobium, Nb in a fluoride ethylene glycol electrolyte. The effect of anodization voltage and electrolyte temperature was studied to find an optimum condition for circular, ordered, and uniform pore formation. The diameter of the pores was found to be larger when the applied voltage was increased from 20 to 80 V. The as-anodized porous film was also observed to comprise of nanocrystallites which formed due to high field-induced crystallization. The nanocrystallites grew into orthorhombic Nb2O5 after post-annealing treatment. The Cr(VI) photoreduction property of both the as-anodized and annealed Nb2O5 samples obtained using an optimized condition (anodization voltage: 60 V, electrolyte temperature: 70 °C) was compared. Interestingly, the as-anodized Nb2O5 film was found to display better photoreduction of Cr(VI) than annealed Nb2O5. However, in terms of stability, the annealed Nb2O5 presented high photocatalytic efficiency for each cycle whereas the as-anodized Nb2O5 showed degradation in photocatalytic performance when used continually.
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Affiliation(s)
- Nurhaswani Alias
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia
| | - Zuhailawati Hussain
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia
| | - Wai Kian Tan
- Institute of Liberal Arts and Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Go Kawamura
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Hiroyuki Muto
- Institute of Liberal Arts and Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Atsunori Matsuda
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Zainovia Lockman
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia.
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Silerio-Vázquez F, Alarcón-Herrera MT, Proal-Nájera JB. Solar heterogeneous photocatalytic degradation of phenol on TiO 2/quartz and TiO 2/calcite: a statistical and kinetic approach on comparative efficiencies towards a TiO 2/glass system. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:42319-42330. [PMID: 35224700 DOI: 10.1007/s11356-022-19379-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 02/19/2022] [Indexed: 06/14/2023]
Abstract
Phenol is a widely used synthetic organic compound, which according to global estimations, is discharged into the environment at a rate of 10 tons/year through industrial waste. Phenol is a recalcitrant pollutant, and human exposure to water containing phenolic substances can lead to health issues. It has been found both in drinking water and wastewater. Solar heterogeneous photocatalytic phenol degradation, measured through chemical oxygen demand, was performed on a thin film tilted plate reactor with TiO2 immobilized onto different support materials. A full factorial experimental design (4 × 3 × 3) was carried out to statistically evaluate if the independent variables' effects were significant. Four advanced oxidation processes (photolysis, photolysis + H2O2, heterogeneous photocatalysis, and heterogeneous photocatalysis + H2O2), three support materials (quartz, calcite, and glass), and three pH levels (3, 5.4, and 9) were evaluated. Reaction kinetics were fitted to the pseudo-first-order reaction rate and data was analyzed with an ANCOVA and means test, considering solar light intensity as a covariate. Photolysis/calcite at pH 5.4 and heterogeneous photocatalysis + H2O2/glass plate at pH 3 gave the best results, with a reaction rate constant kph = 3.047 × 10-3 min-1 and kphC = 4.498 × 10-3 min-1, respectively. The three independent variables and their interactions had a significant effect in the phenol degradation (p < 0.05).
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Affiliation(s)
- Felipe Silerio-Vázquez
- Departamento de Ingeniería Sustentable, Centro de Investigación en Materiales Avanzados, S.C. Calle CIMAV 110, Colonia 15 de mayo, C.P. 34147, Durango, México
| | - María T Alarcón-Herrera
- Departamento de Ingeniería Sustentable, Centro de Investigación en Materiales Avanzados, S.C. Calle CIMAV 110, Colonia 15 de mayo, C.P. 34147, Durango, México
| | - José Bernardo Proal-Nájera
- Instituto Politécnico Nacional, CIIDIR-Durango, Calle Sigma 119, Fraccionamiento 20 de Noviembre II, C. P. 34220, Durango, México.
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Li Z, Wang L, Qin L, Lai C, Wang Z, Zhou M, Xiao L, Liu S, Zhang M. Recent advances in the application of water-stable metal-organic frameworks: Adsorption and photocatalytic reduction of heavy metal in water. CHEMOSPHERE 2021; 285:131432. [PMID: 34273693 DOI: 10.1016/j.chemosphere.2021.131432] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 06/23/2021] [Accepted: 07/01/2021] [Indexed: 05/24/2023]
Abstract
Heavy metals pollution in water is a global environmental issue, which has threatened the human health and environment. Thus, it is important to remove them under practical water environment. In recent years, metal-organic frameworks (MOFs) with water-stable properties have attracted wide interest with regard to the capture of hazardous heavy metal ions in water. In this review, the synthesis strategy and postsynthesis modification preparation methods are first summarized for water-stable MOFs (WMOFs), and then the recent advances on the adsorption and photocatalytic reduction of heavy metal ions in water by WMOFs are reviewed. In contrast to the conventional adsorption materials, WMOFs not only have excellent adsorption properties, but also lead to photocatalytic reduction of heavy metal ions. WMOFs have coupling and synergistic effects on the adsorption and photocatalysis of heavy metal ions in water, which make it more effective in treating single pollutants or different pollutants. In addition, by introducing appropriate functional groups into MOFs or synthesizing MOF-based composites, the stability and ability to remove heavy metal ions of MOFs can be effectively enhanced. Although WMOFs and WMOF-based composites have made great progress in removing heavy metal ions from water, they still face many problems and challenges, and their application potential needs to be further improved in future research. Finally, this review aims at promoting the development and practical application of heavy metal ions removal in water by WMOFs.
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Affiliation(s)
- Zhongwu Li
- College of Geographic Science, Hunan Normal University, Changsha, Hunan, 410081, PR China
| | - Lei Wang
- College of Geographic Science, Hunan Normal University, Changsha, Hunan, 410081, PR China
| | - Lei Qin
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.
| | - Cui Lai
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.
| | - Zhihong Wang
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China
| | - Mi Zhou
- College of Geographic Science, Hunan Normal University, Changsha, Hunan, 410081, PR China
| | - Linhui Xiao
- College of Geographic Science, Hunan Normal University, Changsha, Hunan, 410081, PR China
| | - Shiyu Liu
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China
| | - Mingming Zhang
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China
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Abstract
Environmental and human health are threatened by anthropogenic heavy metal discharge into watersheds. Traditional processes have many limitations, such as low efficiency, high cost, and by-products. Photocatalysis, an emerging advanced catalytic oxidation technology, uses light energy as the only source of energy. It is a clean new technology that can be widely used in the treatment of organic pollutants in water. Given the excellent adaptability of photocatalysis in environmental remediation, it can be used for the treatment of heavy metals. In this comprehensive review, the existing reported works in relevant areas are summarized and discussed. Moreover, recommendations for future work are provided.
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García FE, Litter MI, Sora IN. Assessment of the Arsenic Removal From Water Using Lanthanum Ferrite. ChemistryOpen 2021; 10:790-797. [PMID: 34352155 PMCID: PMC8342224 DOI: 10.1002/open.202100065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 07/09/2021] [Indexed: 11/09/2022] Open
Abstract
The catalytic performance of a perovskite-type lanthanum ferrite LaFeO3 to remove arsenic from water has been investigates for the first time. LaFeO3 was prepared by citrate auto-combustion of dry gel obtained from a solution of the corresponding nitrates poured into citric acid solution. Kinetic studies were performed in the dark with As(V) and in the dark and under UV-C irradiation at pH 6-7 with As(III) (both 1 mg L-1 ), and As : Fe molar ratios (MR) of 1 : 10 and 1 : 100 using the LaFeO3 catalyst. As(V) was removed from solution after 60 min in the dark in 7 % and in 47 % for MR=1 : 10 and MR=1 : 100, respectively, indicating the importance of the amount of the iron material on the removal. Oxidation of As(III) in the dark was negligible after 60 min in contact with the solid sample, but complete removal of As(III) was observed within 60 min of irradiation at 254 nm, due to As(III) photooxidation to As(V) and to As(III) sorption to a minor extent. Morphological and microstructural studies of the catalyst complement the catalytic testing. This work demonstrates that LaFeO3 can be used for the removal of As(III) from highly arsenic contaminated water.
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Affiliation(s)
- Fabiana E. García
- División Química de la Remediación AmbientalGerencia Química, CAC, CNEA, CONICETAv. Gral. Paz 14991650San MartínProv. de Buenos AiresArgentina
| | - Marta I. Litter
- IIIA (CONICET-UNSAM)Universidad Nacional de General San MartínCampus MigueleteAv. 25 de Mayo y Francia1650San MartínProv. de Buenos AiresArgentina
| | - Isabella Natali Sora
- INSTM R.U. and Department of Engineering and Applied SciencesUniversity of Bergamoviale Marconi 524044Dalmine (BG)Italy
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11
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Novack AM, Dos Reis GS, Hackbarth FV, Marinho BA, Ðolić MB, Valle JAB, Sampaio CH, Lima EC, Dotto GL, Ulson de Souza AA, Vilar VJP, Guelli Ulson de Souza SMA. Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:23568-23581. [PMID: 32474789 DOI: 10.1007/s11356-020-09178-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 05/04/2020] [Indexed: 06/11/2023]
Abstract
This paper presents the synthesis of a hybrid material through the use of natural pozzolan and titanium(IV) isopropoxide using the sol-gel method and its application in the photocatalytic hexavalent chromium reduction. The characterization data indicated a mesoporous material possessing a surface area of 271.7 m2 g-1. The morphology studies (SEM and TEM) showed nanosheet hybrid structures. The analysis of DRUV, FTIR, XRD, and Mössbauer spectroscopy provides a different electronic structure of the synthetized material when compared with the originals, proving the hybridization process between pozzolan and titanium(IV) isopropoxide. The photocatalytic reduction of Cr(VI) to Cr(III) using the hybrid material showed a better performance than conventional photocatalysts (precursor and TiO2-P25). Operational conditions such as chromium initial concentration (0.02-0.20 mM), solution pH (3-6), and type of scavenger (citric or tartaric acid) were evaluated in order to determine the best experimental conditions for the Cr(VI) photoreduction. At their optimum (catalyst load of 15 mg L-1, tartaric acid as scavenger, [scavenger]0/[Cr(VI)]0 M ratio = 3:1, pH 3, and 25 °C), the total photoreduction of 0.20 mM Cr(VI) was achieved in 180 min. The novel hybrid materials synthesized from pozzolan and titanium(IV) isopropoxide showed to be a potential catalyst for the Cr(VI) reduction in aqueous solution. Graphical abstract.
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Affiliation(s)
- Aline M Novack
- Laboratory of Mass Transfer, Federal University of Santa Catarina (UFSC), PO Box 476, Florianópolis, SC, 88040-900, Brazil
| | - Glaydson S Dos Reis
- Graduate Program in Mine, Metallurgical, and Materials Engineering (PPGE3M), School of Engineering, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre, RS, Brazil
| | - Fabíola V Hackbarth
- Laboratory of Mass Transfer, Federal University of Santa Catarina (UFSC), PO Box 476, Florianópolis, SC, 88040-900, Brazil
| | - Belisa A Marinho
- Laboratory of Mass Transfer, Federal University of Santa Catarina (UFSC), PO Box 476, Florianópolis, SC, 88040-900, Brazil.
| | - Maja B Ðolić
- Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, 11000, Serbia
| | - José A B Valle
- Laboratory of Mass Transfer, Federal University of Santa Catarina (UFSC), PO Box 476, Florianópolis, SC, 88040-900, Brazil
| | - Carlos H Sampaio
- Departament d'Enginyeria Minera, Industrial i TIC, Prof. Serra Húnter, Universitat Politècnica de Catalunya Barcelona Tech, Manresa, Barcelona, Spain
| | - Eder C Lima
- Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Postal Box 15003, Porto Alegre, RS, 91501-970, Brazil
| | - Guillherme L Dotto
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria (UFSM), Av. Roraima 1000, Santa Maria, RS, 97105-900, Brazil
| | - Antônio Augusto Ulson de Souza
- Laboratory of Mass Transfer, Federal University of Santa Catarina (UFSC), PO Box 476, Florianópolis, SC, 88040-900, Brazil
| | - Vítor J P Vilar
- Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua do Dr. Roberto Frias, 4200-465, Porto, Portugal.
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12
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Simultaneous Removal of Al, Cu and Zn Ions from Aqueous Solutions Using Ion and Precipitate Flotation Methods. Processes (Basel) 2021. [DOI: 10.3390/pr9020301] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This paper presents the results of investigations concerning the simultaneous removal of Al(III), Cu(II), and Zn(II) from dilute aqueous solutions using ion and precipitate flotation methods. The effects of initial solution pH, surface active substance concentration, and the gas velocity on the flotations’ efficiency and course are studied. Experimental results are discussed in terms of physicochemical aspects related to aqueous solutions of metal salts. The results indicate that satisfying simultaneous flotations of aluminum, copper and zinc species are observed if the pH value ranges between 7.0 and 9.0. It was found that an increase in collector concentration results in a decrease in the flotation rate constants. An increase in the gas velocity results in an increase in the ion and precipitate flotation rates.
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13
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Ferreira-Neto EP, Ullah S, Perissinotto AP, de Vicente FS, Ribeiro SJL, Worsley MA, Rodrigues-Filho UP. Prussian blue as a co-catalyst for enhanced Cr( vi) photocatalytic reduction promoted by titania-based nanoparticles and aerogels. NEW J CHEM 2021. [DOI: 10.1039/d1nj01141c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nanostructured Prussian blue layer deposited on titania-based materials acts as an efficient electron acceptor/mediator greatly enhancing Cr(vi) photocatalytic reduction.
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Affiliation(s)
| | - Sajjad Ullah
- Institute of Chemistry
- São Paulo State University (UNESP)
- Araraquara
- Brazil
- Institute of Chemical Sciences
| | | | - Fábio S. de Vicente
- Institute of Geosciences and Exact Sciences
- Department of Physics
- São Paulo State University (UNESP)
- Rio Claro
- Brazil
| | | | - Marcus Andre Worsley
- Physical and Life Sciences Directorate
- Lawrence Livermore National Laboratory
- Livermore
- USA
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14
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Olajire A. Recent advances on the treatment technology of oil and gas produced water for sustainable energy industry-mechanistic aspects and process chemistry perspectives. CHEMICAL ENGINEERING JOURNAL ADVANCES 2020. [DOI: 10.1016/j.ceja.2020.100049] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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15
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Conventional and Current Methods of Toxic Metals Removal from Water Using g-C3N4-Based Materials. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01803-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Gopinath KP, Madhav NV, Krishnan A, Malolan R, Rangarajan G. Present applications of titanium dioxide for the photocatalytic removal of pollutants from water: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 270:110906. [PMID: 32721341 DOI: 10.1016/j.jenvman.2020.110906] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 04/26/2020] [Accepted: 06/01/2020] [Indexed: 05/20/2023]
Abstract
The evolution of modern technology and industrial processes has been accompanied by an increase in the utilization of chemicals to derive new products. Water bodies are frequently contaminated by the presence of conventional pollutants such as dyes and heavy metals, as well as microorganisms that are responsible for various diseases. A sharp rise has also been observed in the presence of new compounds heretofore excluded from the design and evaluation of wastewater treatment processes, categorized as "emerging pollutants". While some are harmless, certain emerging pollutants possess the ability to cause debilitating effects on a wide spectrum of living organisms. Photocatalytic degradation has emerged as an increasingly popular solution to the problem of water pollution due to its effectiveness and versatility. The primary objective of this study is to thoroughly scrutinize recent applications of titanium dioxide and its modified forms as photocatalytic materials in the removal and control of several classes of water pollutants as reported in literature. Different structural modifications are used to enhance the performance of the photocatalyst such as doping and formation of composites. The principles of these modifications have been scrutinized and evaluated in this review in order to present their advantages and drawbacks. The mechanisms involved in the removal of different pollutants through photocatalysis performed by TiO2 have been highlighted. The factors affecting the mechanism of photocatalysis and those affecting the performance of different TiO2-based photocatalysts have also been thoroughly discussed, thereby presenting a comprehensive view of all aspects involved in the application of TiO2 to remediate and control water pollution.
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Affiliation(s)
| | - Nagarajan Vikas Madhav
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Abhishek Krishnan
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Rajagopal Malolan
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Goutham Rangarajan
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Ontario, M5S 3E5, Canada
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17
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Treatment of Produced Water with Photocatalysis: Recent Advances, Affecting Factors and Future Research Prospects. Catalysts 2020. [DOI: 10.3390/catal10080924] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Produced water is the largest byproduct of oil and gas production. Due to the complexity of produced water, especially dissolved petroleum hydrocarbons and high salinity, efficient water treatment technologies are required prior to beneficial use of such waste streams. Photocatalysis has been demonstrated to be effective at degrading recalcitrant organic contaminants, however, there is limited understanding about its application to treating produced water that has a complex and highly variable water composition. Therefore, the determination of the appropriate photocatalysis technique and the operating parameters are critical to achieve the maximum removal of recalcitrant compounds at the lowest cost. The objective of this review is to examine the feasibility of photocatalysis-involved treatment for the removal of contaminants in produced water. Recent studies revealed that photocatalysis was effective at decomposing recalcitrant organic compounds but not for mineralization. The factors affecting decontamination and strategies to improve photocatalysis efficiency are discussed. Further, recent developments and future research prospects on photocatalysis-derived systems for produced water treatment are addressed. Photocatalysis is proposed to be combined with other treatment processes, such as biological treatments, to partially reduce total organic carbon, break down macromolecular organic compounds, increase biodegradability, and reduce the toxicity of produced water.
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18
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Kinetic and mechanistic features on the reaction of stored TiO2 electrons with Hg (II), Pb (II) and Ni (II) in aqueous suspension. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2016.08.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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19
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Kumar R, Patel M, Singh P, Bundschuh J, Pittman CU, Trakal L, Mohan D. Emerging technologies for arsenic removal from drinking water in rural and peri-urban areas: Methods, experience from, and options for Latin America. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 694:133427. [PMID: 31756815 DOI: 10.1016/j.scitotenv.2019.07.233] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 07/14/2019] [Accepted: 07/15/2019] [Indexed: 05/21/2023]
Abstract
Providing drinking water with safe arsenic levels in Latin American (LA) countries (a total of 22 countries) is a major current challenge. Arsenic's presence in water has been neglected for many decades since it was first reported ~100 years ago in Argentina. The major arsenic source in this region is geogenic. So far, arsenic has been reported in 15 LA countries. Arsenic concentrations in drinking water have been reported up to >200 fold (2000 μg/L) the WHO limit of 10 μg/L. About 14 million people in the arsenic affected LA countries depend on contaminated water characterized by >10 μg/L of arsenic. Low-cost, easy to use, efficient, and sustainable solutions are needed to supply arsenic safe water to the rural and peri-urban population in the affected areas. In the present study, >250 research articles published on various emerging technologies used for arsenic remediation in rural and peri-urban areas of LA countries are critically reviewed. Special attention has been given to arsenic adsorption methods. The manuscript focuses on providing insights into low cost emergent adsorbents with an implementation potential in Latin America. Natural, modified and synthetic adsorbents used for arsenic decontamination were reviewed and compared. Advantages and disadvantages of treatment methods are summarized. Adsorbent selection criteria are developed. Recommendations concerning emerging adsorbents for aqueous arsenic removal in LA countries have also been made.
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Affiliation(s)
- Rahul Kumar
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Manvendra Patel
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Prachi Singh
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Jochen Bundschuh
- Faculty of Health, Engineering and Sciences, The University of Southern Queensland, West Street, Toowoomba, 4350, Queensland, Australia
| | - Charles U Pittman
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA
| | - Lukáš Trakal
- Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Praha, 165 00 Suchdol , Czech Republic
| | - Dinesh Mohan
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
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20
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Li X, Deng G, Zhang Y, Wang J. Rapid removal of copper ions from aqueous media by hollow polymer nanoparticles. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.02.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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21
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Mechanisms of removal of heavy metal ions by ZnO particles. Heliyon 2019; 5:e01440. [PMID: 31008388 PMCID: PMC6454208 DOI: 10.1016/j.heliyon.2019.e01440] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 03/04/2019] [Accepted: 03/25/2019] [Indexed: 11/20/2022] Open
Abstract
Effluent discharges from industry and domestic waste containing unknown inorganic pollutants. In this work, different mechanisms of heavy metal ions removal using ZnO particles were studied. ZnO particles were synthesized using solid precipitation technique. The morphology of ZnO particles was rod-like shape. The average length and diameter of ZnO particle were 497.34 ± 15.55 and 75.78 ± 10.39nm, respectively. These particles removed effectively heavy metal ions such as Cu(II), Ag(I) and Pb(II) ions with efficiency >85% under exposure of 1 hour of UV light. However, poor removal efficiency, i.e. <15% was observed for Cr(VI), Mn(II), Cd(II) and Ni(II) ions. The removal of these heavy metal ions was in the forms of metals or metal oxide via reduction/oxidation or adsorption mechanism.
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22
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A Review on the Synthesis and Characterization of Metal Organic Frameworks for Photocatalytic Water Purification. Catalysts 2019. [DOI: 10.3390/catal9010052] [Citation(s) in RCA: 109] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
This review analyzes the preparation and characterization of metal organic frameworks (MOFs) and their application as photocatalysts for water purification. The study begins by highlighting the problem of water scarcity and the different solutions for purification, including photocatalysis with semiconductors, such as MOFs. It also describes the different methodologies that can be used for the synthesis of MOFs, paying attention to the purification and activation steps. The characterization of MOFs and the different approaches that can be followed to learn the photocatalytic processes are also detailed. Finally, the work reviews literature focused on the degradation of contaminants from water using MOF-based photocatalysts under light irradiation.
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23
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Feng J, Yang Z, He S, Niu X, Zhang T, Ding A, Liang H, Feng X. Photocatalytic reduction of Uranium(VI) under visible light with Sn-doped In 2S 3 microspheres. CHEMOSPHERE 2018; 212:114-123. [PMID: 30144672 DOI: 10.1016/j.chemosphere.2018.08.070] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 08/02/2018] [Accepted: 08/14/2018] [Indexed: 06/08/2023]
Abstract
Visible light-driven conversion of soluble U(VI) to slightly soluble U(IV) has been regarded as a efficient and environmentally friendly technology to deal with uranium containing wastewater. In this paper, we attempted to use photocatalytic technology to reduction U(VI) from aqueous solution by constructing a highly efficient photocatalysts. The novel Sn-doped In2S3 microspheres photocatalyst were synthesized for the first time by a simple hydrothermal method, and characterized with various analytical and spectroscopic techniques to determine their structural, morphological, compositional, optical and photocatalytic properties. In determination of photocatalytic activity, the results showed that all Sn-doped In2S3 samples exhibited greater photocatalytic performance in reduction of U(VI) under visible light than the pure In2S3. The optimum SnIn2S3 photocatalyst with Sn:In molar ratio of 1:4.8 (SnIn2S3) had the highest photocatalytic performance (95% reduction efficiency within 40 min irradiation time), which was approximately 15.60 times faster than that of pure In2S3. The enhanced photocatalytic activity of the optimum SnIn2S3 was largely ascribed to the higher specific surface area, red-shift in the absorption band, the efficient separation of photogenerated electron-hole pairs (e-/h+) and the narrowed band gap with an up shifting of valence band, conduction band potentials. In addition the optimum SnIn2S3 photocatalyst exhibited a good recyclability and stability during the repetitive experiments. Finally, the possible active species and the possible mechanism on basis of the experimental results were discussed in detail.
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Affiliation(s)
- Jinna Feng
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Zhiquan Yang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; State Key Laboratory of Urban Water Resources & Environment, Harbin Institute of Technology, Harbin 150001, PR China.
| | - Shan He
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Xiaojun Niu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Taiping Zhang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - An Ding
- State Key Laboratory of Urban Water Resources & Environment, Harbin Institute of Technology, Harbin 150001, PR China
| | - Heng Liang
- State Key Laboratory of Urban Water Resources & Environment, Harbin Institute of Technology, Harbin 150001, PR China
| | - Xiaochi Feng
- State Key Laboratory of Urban Water Resources & Environment, Harbin Institute of Technology, Harbin 150001, PR China
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24
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Meichtry JM, Slodowicz M, Cancelada L, Destaillats H, Litter MI. Sonochemical reduction of Cr(VI) in air in the presence of organic additives: What are the involved mechanistic pathways? ULTRASONICS SONOCHEMISTRY 2018; 48:110-117. [PMID: 30080533 DOI: 10.1016/j.ultsonch.2018.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 04/11/2018] [Accepted: 05/15/2018] [Indexed: 05/14/2023]
Abstract
The sonochemical (850 kHz) reduction of Cr(VI) (0.3 mM, pH 2, reactor open to air) was analyzed in the presence of different additives. The effects on Cr(VI) reduction efficiency of added formic acid (FA, 10 mM), citric acid (Cit, 2 mM), ethylenediaminetetraacetic acid (EDTA, 1 mM), methanol (MeOH, 0.1 M), ethanol (EtOH, 0.1 M), 2-propanol (2-PrOH, 0.1 M), tert-butanol (t-BuOH, 0.1 M), phenol (PhOH, 2 mM) and sodium lauryl sulfate (SLS, 1 mM) have been evaluated in comparison with the system in the absence of additives. Complete Cr(VI) reduction was obtained only when using EDTA (at 120 min) and Cit (at 180 min). Cr(III) complexes with these compounds or with their degradation products were detected as final products. For EDTA, Cit, t-BuOH, FA and SLS, the Cr(VI) decay could be adjusted to a zero-order kinetics; in the cases of MeOH, EtOH and 2-PrOH, there was a deviation from the zero-order kinetics. The Cr(VI) conversion increased in the order SLS (very low) < no additive ≅ MeOH ≅ EtOH ≅ 2-PrOH < FA < t-BuOH < PhOH < Cit < EDTA. The role of EDTA and Cit in stabilizing intermediate Cr(V) peroxo compounds and enhancing their direct transformation into different Cr(III) species is considered a major factor in the acceleration of Cr(VI) reduction processes. Mechanistic pathways are proposed.
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Affiliation(s)
- Jorge M Meichtry
- Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina
| | - Mariel Slodowicz
- Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina
| | - Lucía Cancelada
- Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina
| | - Hugo Destaillats
- Indoor Environment Group, Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Marta I Litter
- Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina; Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de General San Martín, Campus Miguelete, Av. 25 de Mayo y Francia, 1650 San Martín, Prov. de Buenos Aires, Argentina.
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25
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Kukovecz Á, Kordás K, Kiss J, Kónya Z. Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires. SURFACE SCIENCE REPORTS 2016. [DOI: 10.1016/j.surfrep.2016.06.001] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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26
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Meichtry JM, Levy IK, Mohamed HH, Dillert R, Bahnemann DW, Litter MI. Mechanistic Features of the TiO2Heterogeneous Photocatalysis of Arsenic and Uranyl Nitrate in Aqueous Suspensions Studied by the Stopped-Flow Technique. Chemphyschem 2016; 17:885-92. [DOI: 10.1002/cphc.201500949] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Jorge M. Meichtry
- Gerencia Química; Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499 1650 San Martín Prov. de Buenos Aires Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Av. Rivadavia 1917 1033 Ciudad Autónoma de Buenos Aires Argentina
| | - Ivana K. Levy
- Gerencia Química; Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499 1650 San Martín Prov. de Buenos Aires Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Av. Rivadavia 1917 1033 Ciudad Autónoma de Buenos Aires Argentina
| | - Hanan H. Mohamed
- Chemistry Department; Faculty of Science; Helwan University; Ain Helwan Cairo Egypt
| | - Ralf Dillert
- Institut für Technische Chemie; Leibniz Universität Hannover; Callinstrasse 3 30167 Hannover Germany
| | - Detlef W. Bahnemann
- Institut für Technische Chemie; Leibniz Universität Hannover; Callinstrasse 3 30167 Hannover Germany
- Laboratory for Nanocomposite Materials; Department of Photonics; Faculty of Physics; Saint-Petersburg State University; Ulianovskaia str. 3, Peterhof Saint-Petersburg 198504 Russia
| | - Marta I. Litter
- Gerencia Química; Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499 1650 San Martín Prov. de Buenos Aires Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Av. Rivadavia 1917 1033 Ciudad Autónoma de Buenos Aires Argentina
- Instituto de Investigación e Ingeniería Ambiental; Universidad Nacional de General San Martín, Campus Miguelete; Av. 25 de Mayo y Francia 1650 San Martín Prov. de Buenos Aires Argentina
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27
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Montesinos VN, Salou C, Meichtry JM, Colbeau-Justin C, Litter MI. Role of Cr(iii) deposition during the photocatalytic transformation of hexavalent chromium and citric acid over commercial TiO2 samples. Photochem Photobiol Sci 2016; 15:228-34. [DOI: 10.1039/c5pp00420a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A larger specific area makes UV100 more efficient than P25 for Cr(vi) and citric acid removal. Citric and 3-oxoglutaric acids prevent surface deposition of Cr(iii) recombining centers.
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Affiliation(s)
- V. N. Montesinos
- Gerencia Química
- Centro Atómico Constituyentes
- CNEA
- 1650 San Martín
- Argentina
| | - C. Salou
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- 91405 Orsay Cedex
- France
| | - J. M. Meichtry
- Gerencia Química
- Centro Atómico Constituyentes
- CNEA
- 1650 San Martín
- Argentina
| | | | - M. I. Litter
- Gerencia Química
- Centro Atómico Constituyentes
- CNEA
- 1650 San Martín
- Argentina
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28
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Hojman JY, Meichtry JM, Litter MI, Pérez Coll CS. Abatement of toxicity of effluents containing Cr(VI) by heterogeneous photocatalysis. Toxicity assessment by AMPHITOX assay. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 122:545-550. [PMID: 26432027 DOI: 10.1016/j.ecoenv.2015.09.036] [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: 05/29/2015] [Revised: 09/21/2015] [Accepted: 09/22/2015] [Indexed: 06/05/2023]
Abstract
Toxicity of a Cr(VI) solution before and after treatment by TiO2 heterogeneous photocatalysis (HP) was performed with AMPHITOX bioassay. Changes in toxicity on Rhinella arenarum larvae for 10-d were monitored after exposure to an untreated Cr(VI) solution and to the same solution after HP treatment. The HP treatment of a 41.60 mg L(-1) Cr(VI) solution reduced to 37.5% the concentration of the metal ion. A 10-fold reduction in toxicity at acute exposure (72 h) and 150-fold reduction in toxicity after 240 h was found. Further, the LOEC value increased from 0.001% for the untreated solution to 0.153% after HP treatment. Moreover, the safe concentration in untreated solution corresponded to 0.0001% sample, and it was 0.01% after the treatment, i.e., 100 times higher. A saving of water of about 100,000 L per L of effluent would be possible through dilution to allow safer concentrations for discharge; the saving would reach the highest value (1,000,000 L per L) at 240 h. Sub-lethal effects were completely absent in larvae exposed to the treated solution. The AMPHITOX test allowed to detect chronic effects at low Cr concentrations, i.e. at environmentally relevant levels.
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Affiliation(s)
- Jonatan Y Hojman
- Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de Gral. San Martín, Campus Miguelete, Av. 25 de Mayo y Martín de Irigoyen, 1650 San Martín, Prov. de Buenos Aires, Argentina
| | - J Martín Meichtry
- Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina
| | - Marta I Litter
- Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de Gral. San Martín, Campus Miguelete, Av. 25 de Mayo y Martín de Irigoyen, 1650 San Martín, Prov. de Buenos Aires, Argentina; Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina
| | - Cristina S Pérez Coll
- Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de Gral. San Martín, Campus Miguelete, Av. 25 de Mayo y Martín de Irigoyen, 1650 San Martín, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina
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29
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Meichtry JM, Dillert R, Bahnemann DW, Litter MI. Application of the Stopped Flow Technique to the TiO₂-Heterogeneous Photocatalysis of Hexavalent Chromium in Aqueous Suspensions: Comparison with O₂ and H₂O₂ as Electron Acceptors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6229-6236. [PMID: 25974749 DOI: 10.1021/acs.langmuir.5b00574] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The dynamics of the transfer of electrons stored in TiO2 nanoparticles to Cr(VI) in aqueous solution have been investigated using the stopped flow technique. TiO2 nanoparticles were previously irradiated under UV light in the presence of formic acid, and trapped electrons (e(trap)(-)) were made to react with Cr(VI) as acceptor species; other common acceptor species such as O2 and H2O2 were also tested. The temporal evolution of the number of trapped electrons was followed by the decrease in the absorbance at 600 nm, and the kinetics of the electron-transfer reaction was modeled. Additionally, the rate of formation of the surface complex between Cr(VI) and TiO2 was determined with the stopped flow technique by following the evolution of the absorbance at 400 nm of suspensions of nonirradiated TiO2 nanoparticles and Cr(VI) at different concentrations. An approximately quadratic relationship was observed between the maximum absorbance of the surface complex and the concentration of Cr(VI), suggesting that Cr(VI) adsorbs onto the TiO2 surface as dichromate. The kinetic analyses indicate that the electron transfer from TiO2 to Cr(VI) does not require the previous formation of the Cr(VI)-TiO2 surface complex, at least the complex detected here through the stopped flow experiments. When previously irradiated TiO2 was used to follow the evolution of the Cr(VI)-TiO2 complex, an inhibition of the formation of the complex was observed, which can be related to the TiO2 deactivation caused by Cr(III) deposition.
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Affiliation(s)
- Jorge M Meichtry
- †Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina
- ‡Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina
| | - Ralf Dillert
- §Institut für Technische Chemie, Leibniz Universität Hannover, Callinstrasse 3, D-30167 Hannover, Germany
| | - Detlef W Bahnemann
- §Institut für Technische Chemie, Leibniz Universität Hannover, Callinstrasse 3, D-30167 Hannover, Germany
- ⊥Laboratory for Nanocomposite Materials, Department of Photonics, Faculty of Physics, Saint-Petersburg State University, Ulianovskaia str. 3, Peterhof, Saint-Petersburg, 198504, Russia
| | - Marta I Litter
- †Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina
- ‡Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina
- ∥Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de General San Martín, Campus Miguelete, Av. 25 de Mayo y Francia, 1650 San Martín, Prov. de Buenos Aires, Argentina
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