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Rekik H, Arab H, Pichon L, El Khakani MA, Drogui P. Per-and polyfluoroalkyl (PFAS) eternal pollutants: Sources, environmental impacts and treatment processes. CHEMOSPHERE 2024; 358:142044. [PMID: 38648982 DOI: 10.1016/j.chemosphere.2024.142044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 04/03/2024] [Accepted: 04/04/2024] [Indexed: 04/25/2024]
Abstract
Per- and polyfluoroalkyl substances (PFAS) have become a growing environmental concern due to their tangible impacts on human health. However, due to the large number of PFAS compounds and the analytical difficulty to identify all of them, there are still some knowledge gaps not only on their impact on human health, but also on how to manage them and achieve their effective degradation. PFAS compounds originate from man-made chemicals that are resistant to degradation because of the presence of the strong carbon-fluorine bonds in their chemical structure. This review consists of two parts. In the first part, the environmental effects of fluorinated compound contamination in water are covered with the objective to highlight how their presence in the environment adversely impacts the human health. In the second part, the focus is put on the different techniques available for the degradation and/or separation of PFAS compounds in different types of waters. Examples of removal/treatment of PFAS present in either surface or ground water are presented.
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Affiliation(s)
- Hela Rekik
- Institut National de la Recherche Scientifique (INRS) - Centre Eau Terre Environnement (ETE), 490 Rue de la Couronne, Québec (QC), G1K 9A9, Canada
| | - Hamed Arab
- Institut National de la Recherche Scientifique (INRS) - Centre Eau Terre Environnement (ETE), 490 Rue de la Couronne, Québec (QC), G1K 9A9, Canada
| | - Loick Pichon
- Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650, Blvd, Lionel-Boulet, Varennes, QC, J3X-1P7, Canada
| | - My Ali El Khakani
- Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650, Blvd, Lionel-Boulet, Varennes, QC, J3X-1P7, Canada
| | - Patrick Drogui
- Institut National de la Recherche Scientifique (INRS) - Centre Eau Terre Environnement (ETE), 490 Rue de la Couronne, Québec (QC), G1K 9A9, Canada.
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2
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Reena VN, Bhagyasree GS, Shilpa T, Aswati Nair R, Nithyaja B. Multifaceted Applications of DNA-Capped Silver Nanoparticles in Photonics, Photocatalysis, Antibacterial Activity, Cytotoxicity, and Bioimaging. J Fluoresc 2024:10.1007/s10895-023-03556-x. [PMID: 38381236 DOI: 10.1007/s10895-023-03556-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 12/13/2023] [Indexed: 02/22/2024]
Abstract
Deoxyribonucleic acid (DNA) capped silver nanoparticles are exceptional nanomaterials, featuring precise size and shape control enabled by DNA as a capping agent. DNA stabilizes these nanoparticles' role leading to uniform structures for diverse applications. These nanoparticles are excellent in photonics and medical applications, enhancing fluorescence and medical imaging. In this study, we explore the multifaceted applications of DNA-capped silver nanoparticles, delving into their optical, photocatalytic, antibacterial, cytotoxic, and bioimaging properties. Employing UV-visible absorption spectroscopy and scanning electron microscopy, we provide an analysis of confirmation of silver nanoparticles. The investigation demonstrates substantial photocatalytic efficacy, photodegradation of methylene blue is higher than rhodamine 6G. The presence of silver nanoparticles enhances the fluorescence of rhodamine 6G doped sol-gel glasses. Furthermore, our findings illustrate significant antibacterial effects, encompassing both Gram-positive and Gram-negative bacteria, with DNA-capped silver nanoparticles exhibiting antibacterial activity. Cytotoxicity assessments on HeLa cells reveal concentration-dependent effects, with an LC50 value of 47 µL. Additionally, the in vitro experiments with HeLa cells suggest the promising utility of DNA-capped silver nanoparticles for bioimaging applications. This comprehensive analysis highlights the multifunctionality and potential of DNA-capped silver nanoparticles, offering promising avenues for further exploration and innovation within various scientific domains, particularly in the realm of nanomaterial research.
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Affiliation(s)
- V N Reena
- Photonic Materials Research Laboratory, Department of Physics, Government College Madappally, Vadakara, Kozhikode, 673102, India.
- University of Calicut, Kozhikode, 673635, India.
- Department of Physics, Government Arts and Science College Calicut, Kozhikode, 673018, India.
| | - G S Bhagyasree
- Photonic Materials Research Laboratory, Department of Physics, Government College Madappally, Vadakara, Kozhikode, 673102, India
- University of Calicut, Kozhikode, 673635, India
| | - T Shilpa
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Kasaragod, 671316, India
| | - R Aswati Nair
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Kasaragod, 671316, India
| | - B Nithyaja
- Photonic Materials Research Laboratory, Department of Physics, Government College Madappally, Vadakara, Kozhikode, 673102, India
- University of Calicut, Kozhikode, 673635, India
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3
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Yadav M, Osonga FJ, Sadik OA. Unveiling nano-empowered catalytic mechanisms for PFAS sensing, removal and destruction in water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169279. [PMID: 38123092 DOI: 10.1016/j.scitotenv.2023.169279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 11/14/2023] [Accepted: 12/09/2023] [Indexed: 12/23/2023]
Abstract
Per- and polyfluoroalkyl substances (PFAS) are organofluorine compounds used to manufacture various industrial and consumer goods. Due to their excellent physical and thermal stability ascribed to the strong CF bond, these are ubiquitously present globally and difficult to remediate. Extensive toxicological and epidemiological studies have confirmed these substances to cause adverse health effects. With the increasing literature on the environmental impact of PFAS, the regulations and research have also expanded. Researchers worldwide are working on the detection and remediation of PFAS. Many methods have been developed for their sensing, removal, and destruction. Amongst these methods, nanotechnology has emerged as a sustainable and affordable solution due to its tunable surface properties, high sorption capacities, and excellent reactivities. This review comprehensively discusses the recently developed nanoengineered materials used for detecting, sequestering, and destroying PFAS from aqueous matrices. Innovative designs of nanocomposites and their efficiency for the sensing, removal, and degradation of these persistent pollutants are reviewed, and key insights are analyzed. The mechanistic details and evidence available to support the cleavage of the CF bond during the treatment of PFAS in water are critically examined. Moreover, it highlights the challenges during PFAS quantification and analysis, including the analysis of intermediates in transitioning nanotechnologies from the laboratory to the field.
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Affiliation(s)
- Manavi Yadav
- Department of Chemistry and Environmental Sciences, New Jersey Institutes of Technology (NJIT), United States of America
| | - Francis J Osonga
- Department of Chemistry and Environmental Sciences, New Jersey Institutes of Technology (NJIT), United States of America
| | - Omowunmi A Sadik
- Department of Chemistry and Environmental Sciences, New Jersey Institutes of Technology (NJIT), United States of America.
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Guleria S, Chawla P, Relhan A, Kumar A, Bhasin A, Zhou JL. Antibacterial and photocatalytic potential of bioactive compounds extracted from freshwater microalgae species (Spirogyra and Ocillatoria): A comparative analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169224. [PMID: 38101639 DOI: 10.1016/j.scitotenv.2023.169224] [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: 07/31/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/17/2023]
Abstract
Water pollution by pathogenic bacteria and organic dyes poses potential health hazards for human and aquatic life. This study aims to explore the potential of bioactive compounds extracted from two microalgae species (Spirogyra and Ocillatoria) for water pollution control. The optimization of the extraction process for bioactive compounds resulted in the highest yield at 25 min for Spirogyra and 30 min for Ocillatotia species. Further, the extracted bioactive compounds were analyzed using Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectroscopy (GC-MS). The bioactive compounds exhibited significant antibacterial activity against gram-positive and gram-negative bacteria. Notably, Spirogyra species exhibited a higher zone of inhibition (19.5-20.7 mm) than Ocillatoria species (17.0-18.0 mm) against both gram-positive and gram-negative bacterial strains. Furthermore, the photocatalytic potential of these bioactive compounds was examined by assessing the photodegradation of methylene blue (MB) and crystal violet (CV) dyes under different light sources. The findings revealed that Spirogyra species exhibited better photocatalytic activity than Ocillatoria species for MB and CV. For MB, 89.75 %, 77.82 % and 63.54 % were photodegraded when exposed to UV light, sunlight and visible light using Spirogyra extract, compared to 84.90 %, 74.70 % and 58.30 % by Ocillatoria extract. Regarding CV, Spirogyra extract achieved photodegradation efficiency of 88.94 %, 76.59 % and 64.50 % under UV light, sunlight and visible light, higher than 83.60 %, 73.60 % and 57.70 % by Ocillatoria extract. Both Spirogyra and Ocillatoria species demonstrated the best performance for dye photodegradation under UV irradiation, demonstrating great potential for nature-based water treatment.
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Affiliation(s)
- Samriti Guleria
- Department of Food Technology and Nutrition, Lovely Professional University, 144411 Phagwara, India
| | - Prince Chawla
- Department of Food Technology and Nutrition, Lovely Professional University, 144411 Phagwara, India
| | - Ankush Relhan
- Department of Horticulture, Lovely Professional University, 144411 Phagwara, India
| | - Ashwani Kumar
- Department of Post Harvest Technology, College of Horticulture and Forestry, Rani Lakshmi Bai Central Agricultural University, Jhansi 284003, India
| | - Aparajita Bhasin
- Department of Food Technology and Nutrition, Lovely Professional University, 144411 Phagwara, India.
| | - John L Zhou
- School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia.
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Reena VN, Bhagyasree GS, Shilpa T, Aswati Nair R, Misha H, Nithyaja B. Photocatalytic, Antibacterial, Cytotoxic and Bioimaging Applications of Fluorescent CdS Nanoparticles Prepared in DNA Biotemplate. J Fluoresc 2024; 34:437-448. [PMID: 37284964 DOI: 10.1007/s10895-023-03292-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 05/29/2023] [Indexed: 06/08/2023]
Abstract
Synthesizing nanoparticles in biotemplates has been cited as one of the most promising way to obtain monodispersed inorganic nanoparticles. In this method, uniform voids in porous materials serve as hosts to confine the synthesized nanoparticles. DNA template can be described as a smart glue for assembling nanoscale building blocks. Here we investigate the photocatalytic, antibacterial, cytotoxic, and bioimaging applications of DNA capped CdS. XRD, SEM, TEM, UV-visible absorption, and photoluminescence spectra were used to study structural, morphological, and optical properties of CdS nanoparticles. Prepared CdS nanoparticles exhibit visible fluorescence. The photocatalytic activity of CdS towards Rhodamine 6G and Methylene blue are 64% and 91% respectively. A disc-diffusion method is used to demonstrate antibacterial screening. It was shown that CdS nanoparticles inhibit Gram-positive bacteria and Gram-negative bacteria effectively. DNA capped CdS shows higher activity than uncapped CdS nanoparticles. MTT cell viability assays were carried out in HeLa cells to investigate the cytotoxicity for 24 h. At a concentration 2.5 µg/ml, it shows 84% cell viability and 43% viability at 12.5 µg/ml. The calculated LC50 value is equal to 8 µg/ml. These DNA capped CdS nanoparticles were taken for an in-vitro experiment with HeLa cells to exhibit the possibility of bioimaging applications. The present study suggests that the synthesized CdS nanoparticles could be a potential photocatalyst, antibacterial agent, and biocompatible nanoparticle for bioimaging applications.
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Affiliation(s)
- V N Reena
- Photonic Materials Research Laboratory, Department of Physics, Government College Madappally, Vadakara, Kozhikode, 673102, Kerala, India.
- University of Calicut, Malappuram, 673635, Kerala, India.
| | - G S Bhagyasree
- Photonic Materials Research Laboratory, Department of Physics, Government College Madappally, Vadakara, Kozhikode, 673102, Kerala, India
- University of Calicut, Malappuram, 673635, Kerala, India
| | - T Shilpa
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Kasaragod, 671316, Kerala, India
| | - R Aswati Nair
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Kasaragod, 671316, Kerala, India
| | - H Misha
- Department of Physics, Baselius College, Kottayam, 686001, India
- Mahatma Gandhi University, Kottayam, 686560, India
| | - B Nithyaja
- Photonic Materials Research Laboratory, Department of Physics, Government College Madappally, Vadakara, Kozhikode, 673102, Kerala, India
- University of Calicut, Malappuram, 673635, Kerala, India
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6
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Yueyu S. The synergistic degradation of pollutants in water by photocatalysis and PMS activation. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2023; 95:e10927. [PMID: 37723660 DOI: 10.1002/wer.10927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 09/05/2023] [Accepted: 09/15/2023] [Indexed: 09/20/2023]
Abstract
In recent years, the synergistic degradation of water pollutants through advanced oxidation technology has emerged as a prominent research area due to its integration of various advanced oxidation technologies. The combined utilization of peroxymonosulfate (PMS) activation technology and photocatalysis demonstrates mild and nontoxic characteristics, enabling the degradation of water pollutants across a wide pH range. Moreover, this approach reduces the efficiency of electron hole recombination, broadens the catalyst's light response range, facilitates electron transfer of PMS, and ultimately improves its photocatalytic performance. The paper reviews the current research status of photocatalytic technology and PMS activation technology, respectively, while highlighting the advancements achieved through the integration of photocatalytic synergetic PMS activation technology for water pollutant degradation. Furthermore, this review delves into the mechanisms involving both free radicals and nonradicals in the reaction process and presents a promising prospect for future development in water treatment technology. PRACTITIONER POINTS: Degradation of water pollutants by photocatalysis and PMS synergistic action has emerged. Synergism can enhance the generation of free radicals. This technology can provide theoretical support for actual wastewater treatment.
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Affiliation(s)
- Song Yueyu
- Department of Architecture and Environmental Engineering, Taiyuan University, Taiyuan, China
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7
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Khan MF, Paul Guin J, Thampi RK, Sullivan JA, Murphy CD. Enhanced removal of perfluorooctanoic acid with sequential photocatalysis and fungal treatment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:91478-91486. [PMID: 37474853 PMCID: PMC10439853 DOI: 10.1007/s11356-023-28588-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 06/30/2023] [Indexed: 07/22/2023]
Abstract
In this paper, we report the degradation of perfluorooctanoic acid (PFOA), which is a persistent contaminant in the environment that can severely impact human health, by exposing it to a photocatalyst, bismuth oxyiodide (BiOI), containing both Bi4O5I2 and Bi5O7I phases and a fungal biocatalyst (Cunninghamella elegans). Individually, the photocatalyst (after 3 h) and biocatalyst (after 48 h) degraded 35-40% of 100 ppm PFOA with 20-30% defluorination. There was a marked improvement in the degree of degradation (90%) and defluorination (60%) when PFOA was first photocatalytically treated, then exposed to the fungus. GC- and LC-MS analysis identified the products formed by the different treatments. Photocatalytic degradation of PFOA yielded short-chain perfluorocarboxylic acids, whereas fungal degradation yielded mainly 5:3 fluorotelomer carboxylic acid, which is a known inhibitor of cytochrome P450-catalysed degradation of PFAS in C. elegans. The combined treatment likely resulted in greater degradation because photocatalysis reduced the PFOA concentration without generating the inhibitory 5:3 fluorotelomer carboxylic acid, enabling the fungus to remove most of the remaining substrate. In addition, new fluorometabolites were identified that shed light on the initial catabolic steps involved in PFOA biodegradation.
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Affiliation(s)
- Mohd Faheem Khan
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield , Dublin 4, Ireland
| | - Jhimli Paul Guin
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Ravindranathan K Thampi
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - James A Sullivan
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Cormac D Murphy
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield , Dublin 4, Ireland.
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Cardoso IMF, Pinto da Silva L, Esteves da Silva JCG. Nanomaterial-Based Advanced Oxidation/Reduction Processes for the Degradation of PFAS. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13101668. [PMID: 37242085 DOI: 10.3390/nano13101668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 05/11/2023] [Accepted: 05/16/2023] [Indexed: 05/28/2023]
Abstract
This review focuses on a critical analysis of nanocatalysts for advanced reductive processes (ARPs) and oxidation processes (AOPs) designed for the degradation of poly/perfluoroalkyl substances (PFAS) in water. Ozone, ultraviolet and photocatalyzed ARPs and/or AOPs are the basic treatment technologies. Besides the review of the nanomaterials with greater potential as catalysts for advanced processes of PFAS in water, the perspectives for their future development, considering sustainability, are discussed. Moreover, a brief analysis of the current state of the art of ARPs and AOPs for the treatment of PFAS in water is presented.
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Affiliation(s)
- Inês M F Cardoso
- Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Department of Geosciences, Environment and Territorial Planning, Faculty of Sciences, University of Porto (FCUP), Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Luís Pinto da Silva
- Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Department of Geosciences, Environment and Territorial Planning, Faculty of Sciences, University of Porto (FCUP), Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Joaquim C G Esteves da Silva
- Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Department of Geosciences, Environment and Territorial Planning, Faculty of Sciences, University of Porto (FCUP), Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
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Bentel MJ, Mason MM, Cates EL. Synthesis of Petitjeanite Bi 3O(OH)(PO 4) 2 Photocatalytic Microparticles: Effect of Synthetic Conditions on the Crystal Structure and Activity toward Degradation of Aqueous Perfluorooctanoic Acid (PFOA). ACS APPLIED MATERIALS & INTERFACES 2023; 15:20854-20864. [PMID: 37083368 DOI: 10.1021/acsami.2c20483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The discovery of synthetic Bi3O(OH)(PO4)2 [BOHP] and its application toward photocatalytic oxidation of the water contaminant perfluorooctanoic acid (PFOA) have prompted further interest in development. Despite its high activity toward PFOA degradation, the scarce appearance in the literature and lack of research have left a knowledge gap in the understanding of BOHP synthesis, formation, and photocatalytic activity. Herein, we explore the crystallization of BOHP microparticles via hydrothermal syntheses, focusing on the influence of ions and organics present in the reaction solution when using different hydroxide amendments (NaOH, NH4OH, NMe4OH, and NEt4OH). To better understand the unique structure-activity aspects of BOHP, the related bismuth oxy phosphate (BOP) structural family was also explored, including A-BOP (A = Na+ and K+) and M-BOP derivatives (M = Ca2+, Sr2+, and Pb2+). Results from materials characterization, including X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy, indicated that the crystal structure, morphology, and atomic composition were significantly influenced by solution pH, inorganic metal cations (Na+, K+, Ca2+, Sr2+, and Pb2+), and organic amines. Experiments involving ultraviolet photocatalytic destruction of PFOA by a BOHP suspension revealed that catalytic activity was influenced by the choice of reagents and their variable effect on surface facet growth and crystal defects in the resulting microparticles. Together, this work provides a strategy for crystal facet and surface defect engineering with the potential to expand to other metal oxides within the hydrothermal system.
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Affiliation(s)
- Michael J Bentel
- Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, South Carolina 29634, United States
| | - Marc M Mason
- Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, South Carolina 29634, United States
| | - Ezra L Cates
- Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, South Carolina 29634, United States
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Li Z, Ai W, Zhang Y, Zhang J, Bacha AUR, Liu W, Zhong D, Cai Y, Jin W, Yang L. Dual step-scheme heterojunction with full-visible-light-harvesting towards synergistic persulfate activation for enhanced photodegradation. J Colloid Interface Sci 2023; 640:456-471. [PMID: 36870221 DOI: 10.1016/j.jcis.2023.02.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 01/31/2023] [Accepted: 02/19/2023] [Indexed: 02/24/2023]
Abstract
The occurrence of micropollutants in aquatic media raises great concern because of their biological toxicity and persistence. Herein, visible-light-driven photocatalyst titanium dioxide/graphitic carbon nitride/triiron tetraoxide (TiO2-x/g-C3N4/Fe3O4, TCNF) with oxygen vacancies (Ov) was prepared via a facile hydrothermal-calcination method. The complementary visible-light co-absorption among semiconductors enhances light-harvesting efficiency. The built-in electric field formed during Fermi level alignment drives photoinduced electron transfer to improve charge separation across the interfaces. The increased light-harvesting and favorable energy band bending significantly enhance the photocatalytic performance. Therefore, TCNF-5-500/persulfate system could effectively photodegrade bis-phenol A within 20 min under visible-light irradiation. Moreover, the superior durability, non-selective oxidation, adaptability, and eco-friendliness of the system were confirmed by different reaction conditions and biotoxicity assessment. Furthermore, the photodegradation reaction mechanism was presented according to the major reactive oxygen species produced in the system. Thus, this study constructed a dual step-scheme heterojunction by tuning visible-light absorption and energy band structure to increase the charge transfer efficiency and photogenerated carrier lifetime, which has great potential for environmental remediation using visible photocatalysis.
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Affiliation(s)
- Zhiyang Li
- State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China
| | - Wei Ai
- CSCEC AECOM Consultants Co., Ltd., Lanzhou 730000, China
| | - Yinghe Zhang
- Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application, School of Science, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China.
| | - Jianqiao Zhang
- Luohu District Urban Management and Comprehensive Law Enforcement Bureau, Shenzhen 518003, PR China; Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Aziz-Ur-Rahim Bacha
- State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China
| | - Wenjie Liu
- State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China
| | - Dan Zhong
- State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China
| | - Yixiao Cai
- State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China
| | - Wenbiao Jin
- State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China
| | - Lei Yang
- State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China.
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11
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Constructing thin BiOCl nanoplates for highly efficient photocatalytic peroxymonosulfate activation: In-depth understanding of the activation process. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122771] [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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12
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Pu M, Ye D, Wan J, Xu B, Sun W, Li W. Zinc-based metal–organic framework nanofibers membrane ZIF-65/PAN as efficient peroxymonosulfate activator to degrade aqueous ciprofloxacin. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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13
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Fu C, Xu X, Zheng C, Liu X, Zhao D, Qiu W. Photocatalysis of aqueous PFOA by common catalysts of In 2O 3, Ga 2O 3, TiO 2, CeO 2 and CdS: influence factors and mechanistic insights. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2022; 44:2943-2953. [PMID: 35064382 DOI: 10.1007/s10653-021-01127-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 10/09/2021] [Indexed: 06/14/2023]
Abstract
Gallium oxide (Ga2O3), titanium dioxide (TiO2), cerium dioxide (CeO2), indium oxide (In2O3) and cadmium sulfide (CdS) were commonly used under UV light as photocatalysis system for the pollutants' degradation. In this study, these five catalysts were applied for the photodegradation of perfluorooctanoic acid (PFOA), a well-known perfluoroalkyl substance (PFAS). As a result, the PFOA photodegradation performance was sequenced as: Ga2O3 > TiO2 > CeO2 > In2O3 > CdS. To further explain the photocatalysis mechanism, the effects of initial pH, photon energy and band gap were evaluated. The initial pH of 3 ± 0.2 hinders the catalytic reaction of CdS, resulting in low degradation of PFOA, while it has no significant effect on Ga2O3, TiO2, CeO2 and In2O3. In addition, quantum yield was sequenced as TiO2 > CeO2 > Ga2O3 > In2O3, which may not be the main factor determining the degradation effect. Notably, the band gap energy from large to narrow was as: Ga2O3 > TiO2 > CeO2 > In2O3 > CdS, which exactly matched their degradation performance.
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Affiliation(s)
- Caixia Fu
- School of Environment, Harbin Institute of Technology, Harbin, 150090, China
- School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xiuru Xu
- School of Agricultural and Biological Technology, Wenzhou Vocational College of Science & Technology, Zhejiang, 325006, China.
| | - Chunmiao Zheng
- School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xinjie Liu
- School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Dandan Zhao
- Department of Built Environment, Aalto University, PO Box 15200, 00076, Espoo, Finland
| | - Wenhui Qiu
- School of Public Health and Emergency Management, Southern University of Science and Technology, Shenzhen, 518055, China.
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Yoo HY, Kim MS, Shin H, Lim J. Peroxymonosulfate activation by black TiO 2 nanotube arrays under solar light: Switching the activation mechanism and enhancing catalytic activity and stability. JOURNAL OF HAZARDOUS MATERIALS 2022; 433:128796. [PMID: 35366445 DOI: 10.1016/j.jhazmat.2022.128796] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 03/14/2022] [Accepted: 03/23/2022] [Indexed: 06/14/2023]
Abstract
Black TiO2 nanotube arrays (black TNAs) suffer from the low activity and deactivation for peroxymonosulfate (PMS) activation, which limit their application in the oxidative destruction of organic pollutants in water. Here, we report an efficient, environmentally benign, and cost-effective method to enhance the catalytic activity and prevent the deactivation of black TNAs in PMS activation by utilizing solar energy. Optical absorption and electrochemical analysis and density functional theory calculations demonstrated that abundant oxygen vacancies (estimated to be 26%) on the black TNAs surface markedly improved solar light absorption and electrical conductivity and played a critical role as a catalytic active site for PMS activation. As a result, the solar light-irradiated black TNAs/PMS system exhibited the higher phenol degradation rate (k = 0.0488 min-1) and total organic carbon (TOC) removal efficiency (~70%) compared to other TNAs systems. These results were ascribed to the switching of the reaction mechanism from non-radical mechanism to radical-involved. Black TNAs oxidized organic pollutants by mediating electron transfer from organics to PMS in the dark (i.e., a non-radical pathway). On the other hand, PMS activation under solar light irradiation involved the production of highly reactive sulfate and hydroxyl radicals (i.e., radical pathway), markedly improving the degradation and mineralization of organics. Additionally, the solar light-irradiated black TNAs showed relative pH-independence for PMS activation and durable catalytic performance without the loss of activity during the repetitive reaction cycles.
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Affiliation(s)
- Han Yi Yoo
- Department of Environment and Energy Engineering, Sungshin Women's University, Seoul 01133, Republic of Korea
| | - Min Sun Kim
- Department of Environment and Energy Engineering, Sungshin Women's University, Seoul 01133, Republic of Korea
| | - Hyeyoung Shin
- Graduate School of Energy Science and Technology (GEST), Chungnam National University, Daejeon 34148, Republic of Korea.
| | - Jonghun Lim
- Department of Environment and Energy Engineering, Sungshin Women's University, Seoul 01133, Republic of Korea.
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15
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Navidpour AH, Hosseinzadeh A, Huang Z, Li D, Zhou JL. Application of machine learning algorithms in predicting the photocatalytic degradation of perfluorooctanoic acid. CATALYSIS REVIEWS 2022. [DOI: 10.1080/01614940.2022.2082650] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Amir H. Navidpour
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
| | - Ahmad Hosseinzadeh
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
| | - Zhenguo Huang
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
| | - Donghao Li
- Department of Chemistry, Yanbian University, Yanji, Jilin Province, China
| | - John L. Zhou
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
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16
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Qiu X, Wan Z, Pu M, Xu X, Ye Y, Hu C. Synthesis and Photocatalytic Activity of Pt-Deposited TiO2 Nanotubes (TNT) for Rhodamine B Degradation. Front Chem 2022; 10:922701. [PMID: 35711961 PMCID: PMC9194477 DOI: 10.3389/fchem.2022.922701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 05/02/2022] [Indexed: 02/03/2023] Open
Abstract
Dye wastewater has attracted more and more attention because of its high environmental risk. In this study, a novel TiO2 nanotube (TNT) catalyst was prepared and its morphology and structure were characterized. The synthetic catalyst was used to degrade Rhodamine B (RhB) under UV light and evaluated for the application performance. According to the characterization results and degradation properties, the optimum synthetic conditions were selected as 400°C calcination temperature and 10 wt% Pt deposition. As a result, the degradation efficacies were sequenced as TNT-400-Pt > TNT-500-Pt > TNT-400 > TNT-300-Pt. In addition, the effect of pH and initial concentration of RhB were explored, and their values were both increased with the decreased degradation efficacy. While the moderate volume of 11 mm of H2O2 addition owned better performance than that of 0, 6, and 15 mm. Scavengers such as tertbutanol (t-BuOH), disodium ethylenediaminetetraacetate (EDTA-Na2), and nitroblue tetrazolium (NBT) were added during the catalytic process and it proved that superoxide radical anions (O2–•), photogenerated hole (h+) and hydroxyl radical (OH•) were the main active species contributing for RhB removal. For the application, TNT-Pt could deal with almost 100% RhB, Orange G (OG), Methylene blue (MB), and Congo red (CR) within 70 min and still kept more than 50% RhB removal in the fifth recycling use. Therefore, TNT-Pt synthesized in this study is potential to be applied to the dye wastewater treatment.
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Affiliation(s)
- Xiaojian Qiu
- School of Resources and Environment, Nanchang University, Nanchang, China
| | - Zhenning Wan
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Mengjie Pu
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Xiuru Xu
- School of Agricultural and Biological Technology, Wenzhou Vocational College of Science and Technology, Zhejiang, China
- *Correspondence: Xiuru Xu, ; Chunhua Hu,
| | - Yuanyao Ye
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, China
| | - Chunhua Hu
- School of Resources and Environment, Nanchang University, Nanchang, China
- *Correspondence: Xiuru Xu, ; Chunhua Hu,
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17
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Translocation, bioaccumulation, and distribution of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in plants. iScience 2022; 25:104061. [PMID: 35345465 PMCID: PMC8957016 DOI: 10.1016/j.isci.2022.104061] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are persistent in the environment and have been detected in a variety of plants such as vegetables, cereals, and fruits. Increasing evidence shows that plants are at a risk of being adversely affected by PFASs. This review concludes that PFASs are predominantly absorbed by roots from sources in the soil; besides, the review also discusses several factors such as soil properties and the species of PFASs and plants. In addition, following uptake by root, long-chain PFASs (C ≥ 7 for PFCA and C ≥ 6 for PFSA) were preferentially retained within the root, whereas the short-chain PFASs were distributed across tissues above the ground — according to the studies. The bioaccumulation potential of PFASs within various plant structures are further expressed by calculating bioaccumulation factor (BAF) across various plant species. The results show that PFASs have a wide range of BAF values within root tissue, followed by straw, and then grain. Furthermore, owing to its high water solubility than other PFASs, PFOA is the predominant compound accumulated in both the soil itself and within the plant tissues. Among different plant groups, the potential BAF values rank from highest to lowest as follows: leaf vegetables > root vegetables > flower vegetables > shoot vegetables. Several PFAS groups such as PFOA, PFBA, and PFOS, may have an increased public health risk based on the daily intake rate (ID). Finally, future research is suggested on the possible PFASs degradation occurring in plant tissues and the explanations at genetic-level for the metabolite changes that occur under PFASs stress. Long-chain PFASs are preferentially retained in the roots BAF values were ranked as root > straw > grain in one plant PFOA is the main compound in soil and within plant tissues PFOA, PFBA, and PFOS have a potential risk to humans through dietary exposure
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18
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Samuel MS, Shang M, Niu J. Photocatalytic degradation of perfluoroalkyl substances in water by using a duo-functional tri-metallic-oxide hybrid catalyst. CHEMOSPHERE 2022; 293:133568. [PMID: 35031252 DOI: 10.1016/j.chemosphere.2022.133568] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/25/2021] [Accepted: 01/06/2022] [Indexed: 06/14/2023]
Abstract
The recalcitrant nature of perfluoroalkyl substances (PFASs) urges scientists to discover solutions to permanently remove PFAS contaminations from water with less energy in contrast to incineration. Herein, a duo-functional tri-metallic-oxide (f-TMO) hybrid photocatalyst was developed via a facile process, which displayed both high adsorption capacity and high defluorination rate of a series of PFASs including PFOA, PFOS, PFHpA, PFHxA and PFBA due to the generated holes/electrons (h+/e-) and multi-radicals such as O2•- and SO4•-. Particularly the Langmuir adsorption capacities up to 827.84 and 714.46 mg g-1 along with the adsorption efficiency of 99.8% and 99.4% for PFOS and PFOA were respectively achieved. A defluorination ratio of as high as 74.8% with PFOA and a ratio up to 67.6% with PFOS were respectively received. Over 98% PFOA molecules were degraded within as fast as 15 min under initial concentrations ranging from 1 ppb to 1000 ppb, which demonstrates an excellent degradation kinetics. As for the sulfonic acid of PFOS, an as high as 95.5% degradation efficiency was obtained within 300 min. The degradation rates were 4.5 mg L-1 h-1 for PFOA and 0.54 mg L-1 h-1 for PFOS, respectively. In parallel, the f-TMO photocatalyst still exhibited a >96.2% degradation efficiency after eight regeneration cycles. The high physical adsorption capacity and high defluorination rate make this f-TMO catalyst promising applications in removing various PFASs from a broad range of residential and industrial water systems.
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Affiliation(s)
- Melvin S Samuel
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
| | - Mingwei Shang
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
| | - Junjie Niu
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA.
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19
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Birch QT, Birch ME, Nadagouda MN, Dionysiou DD. Nano-enhanced treatment of per-fluorinated and poly-fluorinated alkyl substances (PFAS). Curr Opin Chem Eng 2022. [DOI: 10.1016/j.coche.2021.100779] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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20
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Xia C, Qu S, Bhattacharjee L, Lim XE, Yang H, Liu J. Degradation of perfluoroalkyl substances using UV/Fe 0 system with and without the presence of oxygen. ENVIRONMENTAL TECHNOLOGY 2022:1-12. [PMID: 35138233 DOI: 10.1080/09593330.2022.2041104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 02/03/2022] [Indexed: 06/14/2023]
Abstract
The wide presence of per- and poly-fluoroalkyl substances (PFAS) in the environment is a global concern, thus their degradation is an imminent task. In this study, oxidative and/or reductive degradation of three representative PFAS - perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), and perfluorooctane sulfonate (PFOS) was achieved using nanoscale zero-valent iron (Fe0 NPs) under ultraviolet (UV) light, both with and without the presence of oxygen. Higher degradation and defluorination rates were obtained for a longer chain PFNA compared to PFOA, and a higher removal of PFAS was achieved without the presence of O2 compared to that with O2. The degradation followed first-order reaction kinetics, and obtained the highest rates of 97.6, >99.9, and 98.5% without the presence of O2 for PFOA, PFNA, and PFOS, respectively. The degradation rates increased with an increase in the nanoparticle concentrations in the range of 1-100 mg/L. In addition to fluoride ions, shorter chain perfluorocarboxylic acids (PFCAs) were detected as the main intermediates during PFAS degradation; PFHpS and 6:2 FTS were also detected during PFOS degradation. Hydroxyl radicals (·OH) and superoxide radicals (·O2-) were not involved in the degradation of PFOA, but likely involved in the degradation of PFOS. Emerging contaminants PFAS degradation using the UV/Fe0 system is a cost-effective technology owing to the low cost and recyclability of Fe0 nanomaterials, low energy consumption in the system, and its capability to degrade PFAS both with and without the presence of oxygen. This technology can be potentially applied to treat PFAS-contaminated waters in the environment.
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Affiliation(s)
- Chunjie Xia
- School of Civil, Environmental and Infrastructure Engineering, Southern Illinois University, Carbondale, IL, USA
| | - Shuo Qu
- School of Civil, Environmental and Infrastructure Engineering, Southern Illinois University, Carbondale, IL, USA
| | - Linkon Bhattacharjee
- School of Civil, Environmental and Infrastructure Engineering, Southern Illinois University, Carbondale, IL, USA
| | - Xian E Lim
- School of Civil, Environmental and Infrastructure Engineering, Southern Illinois University, Carbondale, IL, USA
| | - Haoran Yang
- School of Civil, Environmental and Infrastructure Engineering, Southern Illinois University, Carbondale, IL, USA
| | - Jia Liu
- School of Civil, Environmental and Infrastructure Engineering, Southern Illinois University, Carbondale, IL, USA
- Materials Technology Center, Southern Illinois University, Carbondale, IL, USA
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21
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Jia J, Liu D, Wang Q, Li H, Ni J, Cui F, Tian J. Comparative study on bisphenols oxidation via TiO 2 photocatalytic activation of peroxymonosulfate: Effectiveness, mechanism and pathways. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127434. [PMID: 34879509 DOI: 10.1016/j.jhazmat.2021.127434] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 09/07/2021] [Accepted: 10/03/2021] [Indexed: 06/13/2023]
Abstract
In this work, degradation of bisphenol F (BPF), bisphenol AF (BPAF) and bisphenol S (BPS) by peroxymonosulfate (PMS) with TiO2 nano-tubes arrays (TiO2NTAs) under simulated sunlight irradiation was investigated and compared for the first time. All three bisphenols exhibited appreciable degradation following the order of BPS < BPAF < BPF, and acidic conditions were more conducive to their degradation. The SO4•-, ·OH, h+ and •O2- were all identified in three bisphenols degradation processes. Among these, SO4•- and •O2- were proven to play a dominant role in BPF oxidation process, but SO4•- and h+ were confirmed as the main reactive species for BPAF and BPS removal. Owing to the different reactive species worked in different bisphenols degradation processes, the influences of inorganic anions on three bisphenols degradation were also different. By analyzing the oxidation intermediates of the three bisphenols, it was found that there were some common degradation pathways including bond-cleavage and hydroxylation of the benzene ring shared by three bisphenols. Besides, some specific degradation pathways were also identified, for example, the self-coupling was found in BPF and BPS degradation process, while the benzene ring splitting was occurred only in BPAF transformation process.
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Affiliation(s)
- Jialin Jia
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Dongmei Liu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Qiao Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Huarui Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jiaxin Ni
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Fuyi Cui
- College of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, China
| | - Jiayu Tian
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China.
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22
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Rashid Al-Mamun M, Hossain KT, Mondal S, Afroza Khatun M, Shahinoor Islam M, Zaved Hossain Khan DM. Synthesis, characterization, and photocatalytic performance of methyl orange in aqueous TiO2 suspension under UV and solar light irradiation. SOUTH AFRICAN JOURNAL OF CHEMICAL ENGINEERING 2022. [DOI: 10.1016/j.sajce.2022.02.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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23
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Abstract
With the fast development of intensive poultry and aquaculture, the consumption of antibiotics has ever been increasing. Absorbed or metabolized antibiotics usually enter the water environment in the form of active drugs and metabolites, which can enhance the resistance of pathogenic microorganisms and even cause serious water pollution. Considering the bacteriostatic activity of antibiotics, the main biological method used to treat organic waste water has limited efficiency. Herein, we prepared Au/TiO2 for the efficient photocatalytic degradation of lomefloxacin (LOM) antibiotic wastewater. Based on the characteristics of prepared Au/TiO2, the short–wavelength light can be converted into photogenerated carriers with TiO2 support and the long–wavelength light can be converted into heat, likely due to the localized surface plasmon resonance effect of Au, synergistically promoting the LOM degradation. This study not only demonstrates that Au/TiO2 is an efficient photocatalyst for LOM degradation, but also further indicates the effectiveness of photocatalytic technology in the treatment of antibiotic wastewater.
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24
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Zhang B, Wu M, Chen Z, Dong L, Li B, Tao L, Wang H, Li D. Fabrication of novel direct Z-scheme + isotype heterojunction photocatalyst g-C 3N 4/TiO 2 with peroxymonosulfate (PMS) activation synergy and 2D/0D structure. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01387h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A novel strategy for fabricating C3N4/TiO2 Z-scheme heterojunctions based on C3N4 isotype heterojunctions is presented. This scheme exploits the structural plasticity of C3N4 to achieve a breakthrough in activity without adding new materials.
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Affiliation(s)
- Bowen Zhang
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Mingkun Wu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Zhengjun Chen
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Lihui Dong
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Bin Li
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Lin Tao
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Haonan Wang
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Danyang Li
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
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25
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Pan C, Zhu F, Wu M, Jiang L, Zhao X, Yang M. Degradation and toxicity of the antidepressant fluoxetine in an aqueous system by UV irradiation. CHEMOSPHERE 2022; 287:132434. [PMID: 34606890 DOI: 10.1016/j.chemosphere.2021.132434] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 09/05/2021] [Accepted: 09/17/2021] [Indexed: 06/13/2023]
Abstract
Fluoxetine (FLU), a selective serotonin reuptake inhibitor, is commonly found in aquatic environments. Ultraviolet (UV) photolysis is widely used to remove certain pharmaceuticals from water and wastewater. The present study aimed to investigate the toxicity of FLU and its transformed products formed during UV photolysis by using zebrafish embryos (Danio rerio) as a model. The degradation rates of FLU for five days were approximately 63.6% ± 2.14%, 84.6% ± 0.99%, and 97.5% ± 0.25% after 15, 30, and 60 min of UV irradiation, respectively. Furthermore, the degradation mechanism was explored using LC-MS measurements and density flooding theory (DFT) theoretical calculations. Comprehensive toxicity preassessment of FLU and its degradation products was carried out using the T.E.S.T. software. The effects of physiological and biochemical parameters and neuron- and apoptosis-related gene expression were examined in zebrafish embryos exposed to non-irradiated (0-min) and irradiated (15, 30- and 60-min) solutions from 4 h post-fertilization (hpf) to 120 hpf. The hatching time of zebrafish embryos exposed to the non-irradiated solution (0-min) and irradiated solution (60-min) was delayed, their heart rate at 48 and 72 hpf increased, and their body length at 120 hpf decreased. Significant differences were found between the non-irradiated (0-min) and UV-irradiated (15- or 30-min) groups. A dynamic response involving acetylcholinesterase (AChE) and superoxide dismutase (SOD) activity was also observed in the non-irradiated and UV-irradiated groups. During the UV treatment experiments, the expression levels of neuron-related and apoptosis-related genes were significantly reduced over time alongside the formation of FLU degradation products. Overall, this study provides new concepts to remove and assess the toxicity of emerging contaminants in aquatic environments and highlights the need to consider the formation and persistence of toxic transformation products.
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Affiliation(s)
- Chenyuan Pan
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
| | - Feng Zhu
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
| | - Minghong Wu
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
| | - Lihui Jiang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
| | - Xiaoyu Zhao
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
| | - Ming Yang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
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26
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Yang N, Xiao L, Deng Y, Wu Z, Yin H, Liu Y, Li M, Ye Y, Wang D, Li Q, Pan F, Xia D. Manganese oxide OMS-2 loaded on activated carbon fiber: a novel catalyst-assisted UV/PMS process for carbamazepine treatment in water. NEW J CHEM 2022. [DOI: 10.1039/d2nj02119f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel catalyst was prepared by loading OMS-2 onto activated carbon fiber (ACF) via a one-step hydrothermal method, which was further adopted for carbamazepine treatment.
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Affiliation(s)
- Ning Yang
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
| | - Lixi Xiao
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
| | - Yuwei Deng
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
| | - Zhiyu Wu
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
| | - Hang Yin
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
| | - Yang Liu
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
| | - Mengru Li
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
| | - Yuxuan Ye
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
- Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China
| | - Dandan Wang
- Analysis of Testing Center, Yancheng Institute of Technology, Yancheng 224051, China
| | - Qiang Li
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
- Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China
| | - Fei Pan
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
- Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China
| | - Dongsheng Xia
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
- Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China
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Liu R, Zhao M, Zheng X, Wang Q, Huang X, Shen Y, Chen B. Reduced graphene oxide/TiO 2(B) immobilized on nylon membrane with enhanced photocatalytic performance. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 799:149370. [PMID: 34358743 DOI: 10.1016/j.scitotenv.2021.149370] [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: 06/02/2021] [Revised: 07/24/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
Taking advantage of the unique properties of reduced graphene oxide (rGO) and monoclinic crystalline titanium dioxide (TiO2(B)) nanomaterials, a novel rGO-TiO2(B) composite membrane (MrGO-TiO2(B)) was constructed by UV-light-assisted self-assembly of rGO and TiO2 on a nylon membrane. The structure of MrGO-TiO2(B) was characterized by scanning electron microscopy, transmission electron microscopy, UV-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction analysis. Through 2D/2D self-assembly, rGO and TiO2(B) were more tightly combined, and then MrGO-TiO2(B) exhibited outstanding photocatalytic activity and an excellent methylene blue (MB) removal rate. MB was completely removed in 60 min at a constant rate of 0.042 min-1 by the MrGO-TiO2(B)/H2O2/MB system upon solar simulating Xe lamp irradiation. The synergistic effect of rGO and TiO2(B) facilitated the photocatalytic degradation of MB. TiO2(B) was excited and generated electrons and holes upon irradiation. Some electrons migrated to the surface of TiO2(B) to react with H2O2 to produce hydroxyl radicals (OH), while the other electrons migrated to the surface of rGO to react with H2O2, producing OH. In addition, a number of superoxide radicals (O2-) was detected. The holes in the valence band of TiO2(B) directly oxidized MB. The catalytic activity of MrGO-TiO2(B) toward MB degradation remained stable after four rounds of reuse. Therefore, the surface modification of a nylon membrane with TiO2(B) and rGO can serve as a promising route to fabricate photocatalytic membranes for use in the water treatment industry.
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Affiliation(s)
- Renlan Liu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China; Zhejiang Provincial Engineering Laboratory for Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China.
| | - Min Zhao
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China; Zhejiang Provincial Engineering Laboratory for Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China.
| | - Xiangyong Zheng
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China; Zhejiang Provincial Engineering Laboratory for Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China.
| | - Qi Wang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China; Zhejiang Provincial Engineering Laboratory for Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China.
| | - Xianfeng Huang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China; Zhejiang Provincial Engineering Laboratory for Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China.
| | - Yi Shen
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, China.
| | - Baoliang Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China.
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Verma S, Varma RS, Nadagouda MN. Remediation and mineralization processes for per- and polyfluoroalkyl substances (PFAS) in water: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 794:148987. [PMID: 34426018 DOI: 10.1016/j.scitotenv.2021.148987] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 06/13/2023]
Abstract
Per- and polyfluoroalkyl substances (PFAS) are synthetic organic molecules used to manufacture various consumer and industrials products. In PFAS, the CF bond is stable, which renders these compounds chemically stable and prevents their breakdown. Several PFAS treatment processes such as adsorption, photolysis and photocatalysis, bioremediation, sonolysis, electrochemical oxidation, etc., have been explored and are being developed. The present review article has critically summarized degradative technologies and provides in-depth knowledge of photodegradation, electrochemical degradation, chemical oxidation, and reduction mineralization mechanism. Also, novel non-degradative technologies, including nano-adsorbents, natural and surface-modified clay minerals/zeolites, calixarene-based polymers, and molecularly imprinted polymers and adsorbents derived from biomaterials are discussed in detail. Of these novel approaches photocatalysis combined with membrane filtration or electrochemical oxidation via a treatment train approach shows promising results in removing PFAS in natural waters. The photocatalytic mineralization mechanism of PFOA is discussed, leading to recommendations for future research on novel remediation strategies for removing PFAS from water.
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Affiliation(s)
- Sanny Verma
- Pegasus Technical Services, Inc., 46 E. Hollister Street, Cincinnati, OH 45219, USA
| | - Rajender S Varma
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University in Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Mallikarjuna N Nadagouda
- Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435, USA.
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29
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Navidpour AH, Hosseinzadeh A, Zhou JL, Huang Z. Progress in the application of surface engineering methods in immobilizing TiO 2 and ZnO coatings for environmental photocatalysis. CATALYSIS REVIEWS 2021. [DOI: 10.1080/01614940.2021.1983066] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Amir H. Navidpour
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
| | - Ahmad Hosseinzadeh
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
| | - John L. Zhou
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
| | - Zhenguo Huang
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, Australia
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30
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Synergistic degradation of tetracycline by BiOBr microspheres combined with peroxydisulfate under visible LED light irradiation. J CHEM SCI 2021. [DOI: 10.1007/s12039-021-01955-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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31
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Tow EW, Ersan MS, Kum S, Lee T, Speth TF, Owen C, Bellona C, Nadagouda MN, Mikelonis AM, Westerhoff P, Mysore C, Frenkel VS, deSilva V, Walker WS, Safulko AK, Ladner DA. Managing and treating per- and polyfluoroalkyl substances (PFAS) in membrane concentrates. AWWA WATER SCIENCE 2021; 3:1-23. [PMID: 34938982 PMCID: PMC8687045 DOI: 10.1002/aws2.1233] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Per- and polyfluoroalkyl substances (PFAS), which are present in many waters, have detrimental impacts on human health and the environment. Reverse osmosis (RO) and nanofiltration (NF) have shown excellent PFAS separation performance in water treatment; however, these membrane systems do not destroy PFAS but produce concentrated residual streams that need to be managed. Complete destruction of PFAS in RO and NF concentrate streams is ideal, but long-term sequestration strategies are also employed. Because no single technology is adequate for all situations, a range of processes are reviewed here that hold promise as components of treatment schemes for PFAS-laden membrane system concentrates. Attention is also given to relevant concentration processes because it is beneficial to reduce concentrate volume prior to PFAS destruction or sequestration. Given the costs and challenges of managing PFAS in membrane concentrates, it is critical to evaluate both established and emerging technologies in selecting processes for immediate use and continued research.
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Affiliation(s)
- Emily W Tow
- F. W. Olin College of Engineering, Needham, Massachusetts, USA
| | - Mahmut Selim Ersan
- School of Sustainable Engineering and the Built Environment, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Arizona State University, Tempe, Arizona, USA
| | - Soyoon Kum
- David L. Hirschfeld Department of Engineering, Angelo State University, San Angelo, Texas, USA
| | - Tae Lee
- Office of Research and Development, Center for Environmental Solutions and Emergency Response, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA
| | - Thomas F Speth
- Office of Research and Development, Center for Environmental Solutions and Emergency Response, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA
| | | | - Christopher Bellona
- Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado, USA
| | - Mallikarjuna N Nadagouda
- Office of Research and Development, Center for Environmental Solutions and Emergency Response, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA
| | - Anne M Mikelonis
- Office of Research and Development, Center for Environmental Solutions and Emergency Response, U.S. Environmental Protection Agency, Durham, North Carolina, USA
| | - Paul Westerhoff
- School of Sustainable Engineering and the Built Environment, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Arizona State University, Tempe, Arizona, USA
| | | | | | | | - W Shane Walker
- Department of Civil Engineering, Center for Inland Desalination Systems (CIDS), Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), University of Texas at El Paso, El Paso, Texas, USA
| | - Andrew K Safulko
- Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado, USA
| | - David A Ladner
- Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, South Carolina, USA
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32
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Tab A, Dahmane M, Belabed C, Bellal B, Richard C, Trari M. High efficiency photocatalytic degradation of Ambroxol over Mn doped TiO 2: Experimental designs, identification of transformation products, mineralization and mechanism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 780:146451. [PMID: 33773343 DOI: 10.1016/j.scitotenv.2021.146451] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
Ambroxol (AMB) is a drug commonly used for chronic bronchitis prevention. Once released in surface water, this recalcitrant chemical becomes a hazardous pollutant. Here, we investigated the ability of 1% Mn-doped TiO2 (Mn-TiO2) to mineralize AMB by photocatalysis. We studied the morphology, and the physical and electrochemical properties of Mn-TiO2 using X-ray diffraction, Scanning electron microscopy, Transmission electron microscopy, X-ray fluorescence, BET method, UV-visible, and electrochemical study and optimized the AMB degrading experimental conditions through response surface methodology (RSM). Mn-TiO2 at the dose of 0.625 g·L-1 allowed the complete photodegradation of AMB (30 ppm) at pH 7 under UVA light irradiation for 30 min while total mineralization in CO2 (>96%) was achieved after 24 h of irradiation. Mn-TiO2 was 1.6-time more efficient than TiO2 Degussa P25. Product studies were also carried out by liquid chromatography coupled to electrospray high resolution mass spectrometry. Twenty-one photodegradation products were detected and identified. In addition, ionic chromatography analyses revealed the release of Br-, NH4+, and NO3- at respectively 97, 63 and 35% of the total Br, and N initially present in AMB. Finally, the reusability of the photocatalyst was also tested. After four cycles, the almost complete photodegradation of AMB was achieved showing that Mn-TiO2 was highly stable. This work brings new physical characteristics on Mn-TiO2 photocatalyst. Moreover, it is the first study investigating the photocatalytic degradation of recalcitrant AMB drug.
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Affiliation(s)
- Asma Tab
- Laboratory of Chromatography, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria; Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
| | - Mohamed Dahmane
- Laboratory of Chromatography, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
| | - Chemseddin Belabed
- Laboratory of Materials Physics, Faculty of Physics, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
| | - Bachir Bellal
- Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
| | - Claire Richard
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France.
| | - Mohamed Trari
- Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
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Sahu BK, Juine RN, Sahoo M, Kumar R, Das A. Interface of GO with SnO 2 quantum dots as an efficient visible-light photocatalyst. CHEMOSPHERE 2021; 276:130142. [PMID: 33744649 DOI: 10.1016/j.chemosphere.2021.130142] [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: 01/07/2021] [Revised: 02/18/2021] [Accepted: 02/26/2021] [Indexed: 06/12/2023]
Abstract
Graphene oxide (GO) with beneficial functional groups regulates the surface chemistry for catalytic applications. However, the low electrical conductivity of GO invokes further treatments that compromise the above-valued properties. We report an interfacial engineering of GO decorated with SnO2 quantum dots (QDs) for the visible-light-driven catalysis of dye degradation. Retention of beneficial functional features of GO and QDs in the GO-SnO2 composite is established by using TEM, FTIR, and Raman spectroscopy techniques. Further, investigations with EXAFS and lifetime-measurements provide the local structure and defects distributions in QDs which are correlated with the improved conductivity. PL and electrochemical impedance spectroscopic measurements help unraveling the charge-transfer across the interface of the GO-SnO2 composite. The unique ability of ∼94% degradation of MB using only 0.5 mg of GO-SnO2 catalyst within half an hour under the visible light is demonstrated for the first time with insights on the photocatalytic mechanism.
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Affiliation(s)
- Binaya Kumar Sahu
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603102, India.
| | - Rabindra Nath Juine
- Health Physics Unit, Nuclear Recycle Board, Bhabha Atomic Research Centre Facilities, HBNI, Kalpakkam, 603102, India
| | - Madhusmita Sahoo
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603102, India
| | - Ravi Kumar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - A Das
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603102, India.
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34
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Kadam AN, Bathula C, Lee SW. In situ growth of 1D/2D CdS-Bi 2MoO 6 core shell heterostructures for synergistic enhancement of photocatalytic performance under visible light. CHEMOSPHERE 2021; 275:130086. [PMID: 33677274 DOI: 10.1016/j.chemosphere.2021.130086] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 02/01/2021] [Accepted: 02/21/2021] [Indexed: 06/12/2023]
Abstract
Stability of the photocatalyst, maximum solar energy harvesting and effective photogenerated charge carrier separation are yet demanding key features of the photocatalysis for pollutant abetment and photo-electrochemical applications. Herein, we report the in situ solvothermal synthesis of CdS-Bi2MoO6 core-shell heterostructures (CdS-Bi2MoO6 CSHs) for the photocatalytic elimination of methyl orange (MO) under visible light. The as-synthesized CdS-Bi2MoO6 CSHs exhibited highest photocatalytic performance of 98.5%, which is approximately 10 and 4 folds higher than pristine Bi2MoO6 nanosheets (NSs) and CdS nanorods (NRs), respectively. This significantly enhanced photocatalytic performance is attributed to the core-shell heterostructure that improves the visible-light harvesting ability, facilitates efficient separation and transfer of the photogenerated charge carriers, as well as synergistic band alignment of both CdS NRs and Bi2MoO6 NSs. The CdS-Bi2MoO6 CSHs also showed efficient photocatalytic performance toward methylene blue (MB) as colored dye and tetracycline hydrochloride (TCH) as a colorless emerging contaminant. Additionally, the outcomes of transient photocurrent, electrochemical impedance, and photoluminescence study further corroborate that the construction of core-shell heterostructures with tight contact, leading to effective charge carrier separation. The hole (h+) and superoxide radical anion (•O2-) were determined to be the predominant active species accountable for the MO dye degradation. Furthermore, the CdS-Bi2MoO6 CSHs exhibited a satisfactory recycling efficiency over five cycles (reduced by approximately 6%), owing to the protective Bi2MoO6 NSs shell over the CdS NRs core, demonstrating their applicability in wastewater purification and photo-electrochemical applications.
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Affiliation(s)
- Abhijit N Kadam
- Department of Chemical and Biological Engineering, Gachon University, Seongnam-Daero, 1342, Seongnam-Si, Republic of Korea.
| | - Chinna Bathula
- Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul, 04620, Republic of Korea
| | - Sang-Wha Lee
- Department of Chemical and Biological Engineering, Gachon University, Seongnam-Daero, 1342, Seongnam-Si, Republic of Korea.
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Keerthana S, Yuvakkumar R, Kumar PS, Ravi G, Velauthapillai D, Vo DVN. Investigation of EG-Bi 2S 3 nanorods photocatalytic activity under visible light for dye degradation from aquatic system. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 30:10.1007/s11356-021-14933-z. [PMID: 34156624 DOI: 10.1007/s11356-021-14933-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 06/11/2021] [Indexed: 06/13/2023]
Abstract
Bi2S3, 5 ml EG-Bi2S3, and 10 ml EG-Bi2S3 were synthesized by employing solvothermal route. X-ray diffraction, UV-vis absorption, photoluminescence, Raman, scanning electron microscopic studies confirmed the structural, optical, morphological behaviors. The XRD pattern of Bi2S3, 5 ml EG-Bi2S3, and 10 ml EG-Bi2S3 was correlated well with JCPDS # 65-2435. The crystallite size was found to be 57, 49, and 40 nm. The photoluminescence spectra showed semiconducting property of prepared Bi2S3, 5 ml EG-Bi2S3, and 10 ml EG-Bi2S3. The absorption spectra of Bi2S3, 5 ml EG-Bi2S3, and 10 ml EG-Bi2S3 nanorods were well matched with the spectra of a previous report. The bandgap values of Bi2S3, 5 ml EG-Bi2S3, and 10 ml EG-Bi2S3 were calculated to be 1.56, 1.45, and 1.3 eV in reducing order. The morphology of Bi2S3, 5 ml EG-Bi2S3, and 10 ml EG-Bi2S3 samples showed the development of nanorods. The 10 ml EG-Bi2S3 sample showed better development of nanorods with the addition of ethylene glycol. The agglomeration was considerably reduced with the mixing of solvent. Bi2S3, 5 ml EG-Bi2S3, and 10 ml EG-Bi2S3 catalysts were added to the methylene blue dye solution and its photocatalytic properties were investigated by reducing toxic pollutants under light. The 10 ml EG-Bi2S3 sample with neutral pH and 0.1 g of catalyst was added and investigated which showed 86% of efficiency towards dye degradation. The narrow bandgap, defined morphology of 10 ml EG-Bi2S3, made a positive result towards efficient photocatalytic activity.
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Affiliation(s)
| | - Rathinam Yuvakkumar
- Department of Physics, Alagappa University, Karaikudi, Tamil Nadu, 630 003, India.
| | - Ponnnusamy Senthil Kumar
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, India.
- Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, India.
| | - Ganesan Ravi
- Department of Physics, Alagappa University, Karaikudi, Tamil Nadu, 630 003, India
| | - Dhayalan Velauthapillai
- Faculty of Engineering and Science, Western Norway University of Applied Sciences, 5063, Bergen, Norway
| | - Dai-Viet Nguyen Vo
- Institute of Environmental Sciences, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
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36
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Xu B, Liu S, Zhou JL, Zheng C, Weifeng J, Chen B, Zhang T, Qiu W. PFAS and their substitutes in groundwater: Occurrence, transformation and remediation. JOURNAL OF HAZARDOUS MATERIALS 2021; 412:125159. [PMID: 33951855 DOI: 10.1016/j.jhazmat.2021.125159] [Citation(s) in RCA: 92] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/29/2020] [Accepted: 01/13/2021] [Indexed: 05/27/2023]
Abstract
Poly- and perfluoroalkyl substances (PFAS) are increasingly investigated due to their global occurrence and potential human health risk. The ban on PFOA and PFOS has led to the use of novel substitutes such as GenX, F-53B and OBS. This paper reviews the studies on the occurrence, transformation and remediation of major PFAS i.e. PFOA, PFNA, PFBA, PFOS, PFHxS, PFBS and the three substitutes in groundwater. The data indicated that PFOA, PFBA, PFOS and PFBS were present at high concentrations up to 21,200 ng L-1 while GenX and F-53B were found up to 30,000 ng L-1 and 0.18-0.59 ng L-1, respectively. PFAS in groundwater are from direct sources e.g. surface water and soil. PFAS remediation methods based on membrane, redox, sorption, electrochemical and photocatalysis are analyzed. Overall, photocatalysis is considered to be an ideal technology with low cost and high degradation efficacy for PFAS removal. Photocatalysis could be combined with electrochemical or membrane filtration to become more advantageous. GenX, F-53B and OBS in groundwater treatment by UV/sulfite system and electrochemical oxidation proved effective. The review identified gaps such as the immobilization and recycling of materials in groundwater treatment, and recommended visible light photocatalysis for future studies.
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Affiliation(s)
- Bentuo Xu
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, School of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Shuai Liu
- Research Institute of Poyang Lake, Jiangxi Academy of Sciences, Nanchang 330012, China
| | - John L Zhou
- Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, NSW 2007, Australia
| | - Chunmiao Zheng
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jin Weifeng
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, School of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Bei Chen
- Fisheries Research Institute of Fujian, Xiamen 361013, China
| | - Ting Zhang
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Wenhui Qiu
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
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37
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El Mragui A, Zegaoui O, Esteves da Silva JCG. Elucidation of the photocatalytic degradation mechanism of an azo dye under visible light in the presence of cobalt doped TiO 2 nanomaterials. CHEMOSPHERE 2021; 266:128931. [PMID: 33243579 DOI: 10.1016/j.chemosphere.2020.128931] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/27/2020] [Accepted: 11/08/2020] [Indexed: 06/11/2023]
Abstract
In this study, Co-TiO2 nanoparticles were successfully synthesized using sol-gel and precipitation methods. The effect of Co amount on the physicochemical properties of these nanomaterials was investigated using various techniques. The obtained results showed that the structural and optical properties of the synthesized Co-TiO2 nanomaterials depended closely on the weight percent of Co added to TiO2. It was found that, for 1%Co-TiO2, a substitution of Ti4+ and Co2+/Co3+ within the lattice of TiO2 was happened. The results of the photocatalytic degradation of methyl orange (MO) experiments carried out in the presence of the as prepared nanomaterials showed that under visible light, the sample 1%Co-TiO2 exhibited the best MO conversion. The enhanced photocatalytic activity has been attributed to the efficient charge separation of electrons and holes. The mechanistic studies revealed that O2-, h+ and OH are the major active species, and a possible mechanism degradation pathway of MO dye is proposed.
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Affiliation(s)
- Abderrahim El Mragui
- Research Team "Materials and Applied Catalysis: MCA", CBAE Laboratory, Moulay Ismail University, Faculty of Sciences, BP.11201 Zitoune, Meknès, Morocco
| | - Omar Zegaoui
- Research Team "Materials and Applied Catalysis: MCA", CBAE Laboratory, Moulay Ismail University, Faculty of Sciences, BP.11201 Zitoune, Meknès, Morocco.
| | - Joaquim C G Esteves da Silva
- CIQ(UP) - Research Center in Chemistry, DGAOT, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007, Porto, Portugal
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38
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Wang K, Huang D, Wang W, Li Y, Xu L, Li J, Zhu Y, Niu J. Enhanced decomposition of long-chain perfluorocarboxylic acids (C9-C10) by electrochemical activation of peroxymonosulfate in aqueous solution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 758:143666. [PMID: 33257073 DOI: 10.1016/j.scitotenv.2020.143666] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 11/09/2020] [Accepted: 11/09/2020] [Indexed: 06/12/2023]
Abstract
The decomposition of long-chain perfluorocarboxylic acids (PFCAs), including perfluorononanoic acid (PFNA) and perfluorodecanoic acid (PFDA), were investigated by electrochemical activation of peroxymonosulfate (PMS) on porous Ti/SnO2-Sb membrane anode. The results indicated that PMS activation could efficiently promote PFNA/PFDA decomposition, with pseudo-first-order rate constants about 3.12/2.06 times as compared with that of direct electro-oxidations. The energy consumptions of PFNA and PFDA decomposition were 36.31 and 37.46 kWh·m-3·order-1, respectively. The quantitative detection results of •OH with electron paramagnetic resonance (EPR) demonstrated that PMS activation promoted •OH formation. The inhibited performance in radical scavengers indicated both •OH and SO4•- might be mainly involved in PFNA decomposition, while SO4•- might be mainly involved in PFDA decomposition during PMS activation process. The mineralization mechanism for long-chain PFCAs decomposition which was mainly by repeating CF2-unzipping cycle via radical reaction based on the intermediates verification and mass balance of C and F, was proposed. These results suggested that electrochemical activation of PMS on porous Ti/SnO2-Sb membrane anode exhibited high efficiency in mineralizing PFNA and PFDA under mild conditions. This work might provide an efficient way for persistent organic pollutants, including, but not limited to long-chain PFCAs elimination from wastewater.
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Affiliation(s)
- Kaixuan Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, PR China; State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Dahong Huang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, PR China
| | - Weilai Wang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Yang Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Lei Xu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, PR China
| | - Jiayin Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Yunqing Zhu
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, PR China
| | - Junfeng Niu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, PR China.
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39
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Photocatalytic properties of SnO2/MoO3 mixed oxides and their relation to the electronic properties and surface acidity. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2020.113035] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Lyu S, Hao H, Li X, Lang X. Cooperative TiO 2 photocatalysis with TEMPO and N-hydroxysuccinimide for blue light-driven selective aerobic oxidation of amines. CHEMOSPHERE 2021; 262:127873. [PMID: 33182137 DOI: 10.1016/j.chemosphere.2020.127873] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 07/27/2020] [Accepted: 07/28/2020] [Indexed: 06/11/2023]
Abstract
TiO2 has been the focus of attention in semiconductor photocatalysis for several decades because it can potentially settle the grand energy and environmental issues with earth-abundant elements of Ti and O. However, because of its wide band gap, TiO2 can only collect UV light, hindering its practical applications under the illumination of sunlight. In view of this, an interesting phenomenon of light-driven adsorption of amines onto TiO2 to form a visible light-absorbing complex was adapted to assemble smart photocatalysis. The endurance of this complex was eminently refurbished by blue light-driven continuous adsorption of amines. This in turn promoted a vital selective chemical transformation, blue light-driven selective oxidation of amines into imines with atmospheric dioxygen (O2). More importantly, the inclusion of TEMPO and N-hydroxysuccinimide (NHS) into the smart photocatalytic system could cooperatively expedite the blue light-driven selective aerobic oxidation of amines into imines through dual independent reaction channels, resembling that of enzymatic catalysis. This work underscores the importance of manoeuvring multiple reaction channels by cooperative photocatalysis during selective chemical transformations.
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Affiliation(s)
- Shaoshuai Lyu
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Huimin Hao
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xia Li
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xianjun Lang
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
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Tang Q, Chen W, Dai X, Liu Y, Liu H, Fan L, Luo H, Ji L, Zhang K. Exploring the perspective of nano-TiO 2 in hydrophobic modified cationic flocculant preparation: Reaction kinetics and emulsified oil removal performance. CHEMOSPHERE 2021; 263:128066. [PMID: 33297071 DOI: 10.1016/j.chemosphere.2020.128066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 08/16/2020] [Accepted: 08/18/2020] [Indexed: 06/12/2023]
Abstract
To reduce the polymerization difficulty of hydrophobic modified copolymers, a hydrophobic modified cationic flocculant was fabricated using nano-TiO2 as initiator with acrylamide (AM) and methyl acryloxyethyl dimethyl benzyl ammonium chloride (DML) as monomers, and named it PAD. The copolymers were characterized by scanning electron microscopy (SEM), nuclear magnetic resonance (1H NMR), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TG). Results verified that PAD was synthesized successfully and nano-TiO2 was more conducive to DML grafting than traditional photo-initiators. Reaction kinetics demonstrated that the polymerization process was a typical precipitation polymerization initiated by free radicals. Flocculation performance of flocculant on simulated emulsified oil was evaluated and optimized. The simulation results indicated that the flocculation performance of PAD was superior to traditional flocculant, which was attributed to the higher content of DML in PAD. The maximum removal rate of emulsified oil could reach 92.10%, and the corresponding turbidity removal rate was 93.54%. Further, the mechanism studies suggested that the removal of emulsified oil was realized by the synergistic effects of electric neutralization, demulsification, hydrophobic association and adsorption bridging. The findings of this study showed that nano-TiO2 exhibited a promising prospect in the field of polymer-initiated polymerization.
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Affiliation(s)
- Qian Tang
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Wei Chen
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Department of Municipal Engineering, Chengdu, 611830, China.
| | - Xinning Dai
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Yuchen Liu
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Hong Liu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China
| | - Liangqian Fan
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Department of Municipal Engineering, Chengdu, 611830, China
| | - Hongbing Luo
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Department of Municipal Engineering, Chengdu, 611830, China
| | - Lin Ji
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Department of Municipal Engineering, Chengdu, 611830, China
| | - Ke Zhang
- College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Department of Municipal Engineering, Chengdu, 611830, China
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Jia J, Liu D, Wang S, Li H, Ni J, Li X, Tian J, Wang Q. Visible-light-induced activation of peroxymonosulfate by TiO2 nano-tubes arrays for enhanced degradation of bisphenol A. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117510] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Influence of Metal Oxide Particles on Bandgap of 1D Photocatalysts Based on SrTiO 3/PAN Fibers. NANOMATERIALS 2020; 10:nano10091734. [PMID: 32882871 PMCID: PMC7559362 DOI: 10.3390/nano10091734] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/25/2020] [Accepted: 08/26/2020] [Indexed: 11/17/2022]
Abstract
This paper deals with the study of the optical properties of one-dimensional SrTiO3/PAN-based photocatalysts with the addition of metal oxide particles and the determination of their bandgaps. One-dimensional photocatalysts were obtained by the electrospinning method. Particles of metals such as iron, chromium, and copper were used as additives that are capable of improving the fibers' photocatalytic properties based on SrTiO3/PAN. The optimal ratios of the solutions for the electrospinning of fibers based on SrTiO3/PAN with the addition of metal oxide particles were determined. The transmission and reflection of composite photocatalysts with metal oxide particles were measured in a wide range of spectra, from the ultraviolet region (185 nm) to near-infrared radiation (3600 nm), to determine the values of their bandgaps. Thus, the introduction of metal oxide particles resulted in a decrease in the bandgaps of the obtained composite photocatalysts compared to the initial SrTiO3/PAN (3.57 eV), with the following values: -3.11 eV for SrTiO3/PAN/Fe2O3, -2.84 eV for SrTiO3/PAN/CuO, and -2.89 eV for SrTiO3/PAN/Cr2O3. The obtained composite photocatalysts were tested for the production of hydrogen by the splitting of water-methanol mixtures under UV irradiation, and the following rates of hydrogen evolution were determined: 344.67 µmol h-1 g-1 for SrTiO3/PAN/Fe2O3, 398.93 µmol h-1 g-1 for SrTiO3/PAN/Cr2O3, and 420.82 µmol h-1 g-1 for SrTiO3/PAN/CuO.
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A facile synthesis of bismuth oxychloride-graphene oxide composite for visible light photocatalysis of aqueous diclofenac sodium. Sci Rep 2020; 10:14191. [PMID: 32843698 PMCID: PMC7447784 DOI: 10.1038/s41598-020-71139-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/31/2020] [Indexed: 12/20/2022] Open
Abstract
In this study, bismuth oxychloride/graphene oxide (BiOCl-GO) composite was fabricated by facile one pot hydrothermal method. The pure BiOCl and BiOCl-GO composite was characterized by X-ray diffraction, Transmission electron microscopy X-ray photoelectron spectroscopy and UV-Vis diffuse reflectance spectroscopy. The synthesized composite was then assessed for photocatalytic degradation of diclofenac sodium (DCF) in visible as well as direct solar light and UV irradiation. Results indicated that the photocatalytic removal efficiency of DCF was significantly affected by dose of catalysts, pH value and source of light. The results reveled that degradation efficiency of BiOCl-GO for DCF reduced from 100 to 34.4% with the increases in DCF initial concentration from 5 mg L-1 to 25 mg L-1. The solar light degradation of DCF using BiOCl-GO was achieved with apparent rate constant 0.0037 min-1. The effect of scavengers study revealed that superoxide ions and holes were mainly responsible for DCF degradation. The regeneration study indicates that BiOCl-GO composite can be successfully recycled up to the five cycles. The study revealed the effectiveness of one pot hydrothermal method for the fabrication of BiOCl-GO composite.
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UV Light-Irradiated Photocatalytic Degradation of Coffee Processing Wastewater Using TiO2 as a Catalyst. ENVIRONMENTS 2020. [DOI: 10.3390/environments7060047] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The coffee industry generates a significant amount of wastewater that is rich in organic loads and is highly acidic. The present study investigates the potential of the heterogeneous photocatalytic oxidation process to reduce the pollutant load in coffee processing wastewater. The experimental runs were conducted to evaluate the effect of operative parameters such as pH, catalyst dosage, intensity of UV light irradiation, and addition of oxidant on Chemical Oxygen Demand (COD) and colour reduction. Significant results for COD and colour removal, 67%, and 70% respectively, were achieved at a pH of 4 with titanium dioxide (TiO2), and a catalyst dosage of 500 mg/L, using four ultraviolet-C (UV-C) lamps of 16 W each. With the addition of hydrogen peroxide (H2O2) as an oxidant, the removal efficiency increased to 84% and 75% for COD and colour, respectively. Finally, the best results obtained by photocatalytic degradation using UV light were compared to those using solar light. Based on the investigation, it was inferred that the pollutant removal efficiency in coffee pulping wastewater was also considerably high under sunlight. These findings may have relevance in terms of application in countries where coffee processing is carried out and where sunlight irradiance is usually strong: the technique could be exploited to decrease the pollutant content of this wastewater sustainably.
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