1
|
Zhou G, Liang Y, Zheng Z, Ju L. Application of dewatered paper sludge-derived porous solid base catalyst for biodiesel production: Physicochemical properties, reaction kinetics and thermodynamic studies. ENVIRONMENTAL TECHNOLOGY 2023; 44:3263-3280. [PMID: 35306978 DOI: 10.1080/09593330.2022.2056087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 03/10/2022] [Indexed: 06/14/2023]
Abstract
A new porous solid base catalyst was prepared using dewatered paper sludge and successfully employed to produce biodiesel from soybean oil. The as-prepared catalyst was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transforms infrared spectroscopy, X-ray photoelectron spectroscopy, thermal gravity/differential thermal gravity analysis, Brunauer-Emmet-Teller analysis, and CO2-temperature programmed analysis. The results showed that the formation of CaO and uniformly distributed porous structure should account for the high catalytic activity of the as-prepared catalyst. The optimum reaction conditions were observed at 180 ℃, 8 wt.% catalyst/oil weight ratio, 16:1 methanol/oil molar ratio, and 300 min reaction time with 91.6% biodiesel yield. After being used several times and recycled, the regenerated catalyst still exhibited effective catalytic activity without apparent deactivation. The kinetic study confirmed that the experimental data satisfied with Pseudo-first-order kinetic model controlled by reaction temperature and catalyst/oil weight ratio. The reaction activation energy was 24.98 kJ/mol. The change of enthalpy ΔH (14.98 kJ/mol), entropy ΔS (-208.57 J/mol/K), and Gibbs free energy ΔG (109.46 kJ/mol) indicated that the transesterification reaction catalyzed by the dewatered paper sludge-derived catalyst is endothermic, endergonic, and non-spontaneous. Our research finding indicated that the CaO-based catalyst derived from dewatered paper sludge was an economically promising and eco-friendly solid base catalyst for biodiesel production.
Collapse
Affiliation(s)
- Guoqiang Zhou
- Zhejiang Fashion Institute of Technology, Zhejiang, People's Republic of China
| | - YuHan Liang
- Zhejiang Fashion Institute of Technology, Zhejiang, People's Republic of China
| | - Zhirong Zheng
- Zhejiang Fashion Institute of Technology, Zhejiang, People's Republic of China
| | - Lan Ju
- Zhejiang Fashion Institute of Technology, Zhejiang, People's Republic of China
| |
Collapse
|
2
|
Enhanced Photo–Fenton Removal Efficiency with Core-Shell Magnetic Resin Catalyst for Textile Dyeing Wastewater Treatment. WATER 2021. [DOI: 10.3390/w13070968] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Heterogeneous photo–Fenton reactions have been regarded as important technologies for the treatment of textile dyeing wastewaters. In this work, an efficient core-shell magnetic anion exchange resin (MAER) was prepared through in situ polymerization and used to remove reactive brilliant red (X-3B) in a UV–Fenton system. The MAER exhibited satisfactory removal efficiency for X-3B because of its highly effective catalytic activity. More than 99% of the X-3B (50 mg/L) was removed within 20 min in the UV–Fenton reaction. This is because the uniformly dispersed core-shell magnetic microsphere resin could suppress the aggregation of Fe3O4 nanoparticles and, thus, enhance the exposure of Fe reaction sites for catalytic reaction with H2O2. The good adsorption capacity of MAER also played an important role in promoting contact between X-3B and reactive radicals during the reaction. Mechanism research showed that hydroxyl radical (•OH) was the main reactive radicals for the removal of X-3B in the MAER UV–Fenton system. The MAER can be easily separated by a magnet after catalytic reactions. Moreover, the matrix effects of different substrates (Cl−, NO3−, SO42−, and humic acid) were investigated. The results showed that SO42− could be beneficial to improve the removal of X-3B but that the others decrease the removal. The MAER UV–Fenton also removed significant amounts of total organic carbon (TOC) for the X-3B solution and an actual textile dyeing industrial wastewater. The heterogeneous oxidation system established in this work may suggest prospects for practical applications in the treatment of textile dyeing wastewater.
Collapse
|
3
|
Hou H, Liu Z, Zhang J, Zhou J, Qian G. A review on fabricating functional materials by heavy metal-containing sludges. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:133-155. [PMID: 33063214 DOI: 10.1007/s11356-020-10990-y] [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: 06/10/2020] [Accepted: 09/25/2020] [Indexed: 06/11/2023]
Abstract
With the development of industry, sustainable use of natural resources has become a worldwide hot topic. Heavy metal-containing sludge (HMS) is a hazardous waste after wastewater treatment. At present, HMS is still treated by landfill or landfill after incineration. Considering the components, HMS usually contains various heavy metals and organic compounds, which is potentially used as a raw resource for catalyst production. This review thus concludes recent reports and developments in this field. First, basic technologies are summarized as component regulation, precursor formation, and structure transformations. Second, prepared materials are applied in various catalytic fields, such as gas purification, photocatalysis, electrocatalysis, and Fenton catalysis. During these processes, key factors are multi-metallic components, metal doping, temperature, and pH. They not only influence the formation of HMS-derived catalyst but also the catalytic activity. Furthermore, catalytic activities of HMS-derived catalysts are compared with those synthesized by pure reagents. An assessment and accounting are also supplied if raw resources are substituted by HMS. Finally, in order to apply HMS in a real application, more works must be devoted to the influence of trace metal doping on catalytic activities and stabilities. Besides, more pilot experiments are urgently necessary.
Collapse
Affiliation(s)
- Hao Hou
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, People's Republic of China
| | - Zixing Liu
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, People's Republic of China
| | - Jia Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, People's Republic of China.
- MGI, Shanghai University, Xiapu Town, Xiangdong District, Pingxiang, 337022, Jiangxi, People's Republic of China.
| | - Jizhi Zhou
- School of Economics, Shanghai University, No. 333 Nanchen Road, Shanghai, 200444, People's Republic of China
| | - Guangren Qian
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, People's Republic of China.
- MGI, Shanghai University, Xiapu Town, Xiangdong District, Pingxiang, 337022, Jiangxi, People's Republic of China.
| |
Collapse
|
4
|
Jambhulkar DK, Ugwekar RP, Bhanvase BA, Barai DP. A review on solid base heterogeneous catalysts: preparation, characterization and applications. CHEM ENG COMMUN 2020. [DOI: 10.1080/00986445.2020.1864623] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Diksha K. Jambhulkar
- Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur, Maharashtra, India
| | - Rajendra P. Ugwekar
- Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur, Maharashtra, India
| | - Bharat A. Bhanvase
- Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur, Maharashtra, India
| | - Divya P. Barai
- Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur, Maharashtra, India
| |
Collapse
|
5
|
COD/DOC balanced models for the oxidation process of organic compounds. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2020. [DOI: 10.1007/s43153-020-00008-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
6
|
Xiao C, Li S, Yi F, Zhang B, Chen D, Zhang Y, Chen H, Huang Y. Enhancement of photo-Fenton catalytic activity with the assistance of oxalic acid on the kaolin–FeOOH system for the degradation of organic dyes. RSC Adv 2020; 10:18704-18714. [PMID: 35518336 PMCID: PMC9053902 DOI: 10.1039/d0ra03361h] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 04/26/2020] [Indexed: 11/21/2022] Open
Abstract
The Fenton reaction, as an important member of the advanced oxidation processes (AOPs), has gained extensive attention in recent years. However, the practical applications of the traditional Fenton process have been restricted by the poor degradation efficiency and the rigid pH range. In this study, we report a new strategy regarding the photo-Fenton oxidation of Rhodamine B (RhB) by kaolin–FeOOH (K–Fe) catalysts with the assistance of oxalic acid. It was found that the iron–oxalate complex was formed as oxalic acid was introduced into the K–Fe catalyst system by the chelation ability of oxalate. Benefiting from the high photosensitivity of the iron–oxalate complexes, the K–Fe/oxalic acid/H2O2/visible light system exhibited excellent catalytic activity towards the degradation of RhB under the optimized reaction conditions [(K–Fe) dosage = 1.0 g L−1, initial pH = 7.2, (oxalic acid) = 1.0 mM, (H2O2) = 0.5 mM], and its reaction rate constant for the degradation of RhB was 27.7 times greater than that of the K–Fe/H2O2/visible light system. More importantly, the K–Fe/oxalic acid/H2O2/visible system showed remarkable degradation efficiency over a wide pH range (3.3–10.8), which was superior to that of the traditional Fenton system. In addition, the degradation efficiency of RhB was found to remain at 94.7% after five cycles. This work is expected to provide an important approach for the application of the Fenton system. Degradation mechanism of the K–Fe/oxalic acid/H2O2/visible light system.![]()
Collapse
Affiliation(s)
- Chun Xiao
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| | - Su Li
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| | - Fuhao Yi
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| | - Bo Zhang
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| | - Dan Chen
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| | - Yang Zhang
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| | - Hongxin Chen
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| | - Yueli Huang
- College of Environmental and Chemical Engineering
- Zhaoqing University
- Zhaoqing
- China
| |
Collapse
|
7
|
Jipeng Qi, Wang C, Sun J, Li S. TiO2 Assisted Photocatalytic Decomposition of 2-Chloronaphthalene on Iron Nanoparticles in Aqueous Systems: Synergistic Effect and Intermediate Products. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2019. [DOI: 10.1134/s0036024419080119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
8
|
Degradation of Reactive Dye in Aqueous Solution by Fenton, Photo-Fenton Process and Combination Process with Activated Charcoal and TiO2. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES 2019. [DOI: 10.1007/s40010-019-00618-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
9
|
Morales Urrea DA, Haure PM, Contreras EM. Monitoring the Enzymatic Oxidation of Xenobiotics by Hydrogen Peroxide through Oxidation–Reduction Potential Measurements. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b04616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. A. Morales Urrea
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CCT - Mar del Plata CONICET, Av Juan B. Justo 4302, 7600 Mar del Plata, Argentina
| | - P. M. Haure
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CCT - Mar del Plata CONICET, Av Juan B. Justo 4302, 7600 Mar del Plata, Argentina
- Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad Nacional de Mar del Plata (UNMdP). Av Juan B. Justo 4302, 7600 Mar del Plata, Argentina
| | - E. M. Contreras
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CCT - Mar del Plata CONICET, Av Juan B. Justo 4302, 7600 Mar del Plata, Argentina
| |
Collapse
|
10
|
Chang F, Wu F, Zheng J, Cheng W, Yan W, Deng B, Hu X. In-situ establishment of binary composites α-Fe 2O 3/Bi 12O 17Cl 2 with both photocatalytic and photo-Fenton features. CHEMOSPHERE 2018; 210:257-266. [PMID: 30005347 DOI: 10.1016/j.chemosphere.2018.07.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 06/09/2018] [Accepted: 07/02/2018] [Indexed: 06/08/2023]
Abstract
A set of binary composites α-Fe2O3/Bi12O17Cl2 were established through an in-situ deposition route and these samples were systematically characterized by a collection of analytical techniques. Scanning electron microscopy, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy proved the coexistence of expected two components. High resolution transmission electron microscopy and selected-area electron diffraction indicated the formation of heterojunction domains with the intimate contact of both semiconductors. The degradation behavior of as-synthesized samples was evaluated under visible-light irradiation and the enhanced outcome was observed over dye methyl orange (MO) and colorless 2,4-dichlorophenol (2,4-DCP), mainly attributing to favorable optical and morphological merits, and a suitable well-aligned band structure in these binary composites with a suitable phase composition as well. In addition, these composites showed an obvious photo-Fenton feature that significantly improved the catalytic degradation efficiency over 2,4-DCP when the reagent H2O2 was introduced, indicating the destruction efficiency was controlled by a synergtic effect from both photocatalytic and photo-Fenton degradation routes. Based upon the detection of reactive radical species, a primary synergistic mechanism was eventually speculated.
Collapse
Affiliation(s)
- Fei Chang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China.
| | - Feiyan Wu
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China
| | - JiaoJiao Zheng
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China
| | - Wenbo Cheng
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China
| | - Wenjing Yan
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China
| | - Baoqing Deng
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China
| | - Xuefeng Hu
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, PR China.
| |
Collapse
|
11
|
Ren B, Wang T, Qu G, Deng F, Liang D, Yang W, Liu M. In situ synthesis of g-C 3N 4/TiO 2 heterojunction nanocomposites as a highly active photocatalyst for the degradation of Orange II under visible light irradiation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:19122-19133. [PMID: 29725923 DOI: 10.1007/s11356-018-2114-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 04/23/2018] [Indexed: 06/08/2023]
Abstract
As a highly active photocatalyst, g-C3N4/TiO2 heterojunction nanocomposites were in situ synthesized by simple ultrasonic mixing and calcination by using TiO2 and melamine as precursors. The morphology and structure of the prepared photocatalysts were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activities of g-C3N4/TiO2 nanocomposites to degrade Orange II (AO7) under visible light irradiation were evaluated. Results showed that the photocatalytic rate of the prepared g-C3N4/TiO2 photocatalyst to degrade AO7 was about three times than that of pristine TiO2 and g-C3N4. The g-C3N4/TiO2 composite with a ratio of 1:4 had the highest degradation efficiency for AO7 solution. Its degradation efficiency under acidic conditions was significantly higher than that under alkaline conditions. The enhancement of photocatalytic activity can be attributed to the formation of heterojunctions between g-C3N4 and TiO2, which leads to rapid charge transfer and the efficient separation of photogenerated electron-hole pairs. The recycling experiment indicated that the photocatalyst of g-C3N4/TiO2 nanocomposites still maintained good photochemical stability and recyclability after five cycles; this finding was important for its practical applications. A series of free radical trapping experiments showed that •O2- played a crucial role in the degradation of AO7. Graphical Abstract ᅟ.
Collapse
Affiliation(s)
- Bin Ren
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China
| | - Tiecheng Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
| | - Guangzhou Qu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China.
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China.
| | - Fang Deng
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, 330063, Jiangxi, People's Republic of China
| | - Dongli Liang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
| | - Wenli Yang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China
| | - Meishan Liu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China
| |
Collapse
|
12
|
Morales Urrea DA, Haure PM, García Einschlag FS, Contreras EM. Horseradish peroxidase-mediated decolourization of Orange II: modelling hydrogen peroxide utilization efficiency at different pH values. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:19989-20002. [PMID: 29744778 DOI: 10.1007/s11356-018-2134-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 04/25/2018] [Indexed: 06/08/2023]
Abstract
Enzymatic decolourization of azo-dyes could be a cost-competitive alternative compared to physicochemical or microbiological methods. Stoichiometric and kinetic features of peroxidase-mediated decolourization of azo-dyes by hydrogen peroxide (P) are central for designing purposes. In this work, a modified version of the Dunford mechanism of peroxidases was developed. The proposed model takes into account the inhibition of peroxidases by high concentrations of P, the substrate-dependant catalatic activity of peroxidases (e.g. the decomposition of P to water and oxygen), the generation of oxidation products (OP) and the effect of pH on the decolourization kinetics of the azo-dye Orange II (OII). To obtain the parameters of the proposed model, two series of experiments were performed. In the first set, the effects of initial P concentration (0.01-0.12 mM) and pH (5-10) on the decolourization degree were studied at a constant initial OII concentration (0.045 mM). Obtained results showed that at pH 9-10 and low initial P concentrations, the consumption of P was mainly to oxidize OII. From the proposed model, an expression for the decolourization degree was obtained. In the second set of experiments, the effect of the initial concentrations of OII (0.023-0.090 mM), P (0.02-4.7 mM), HRP (34-136 mg/L) and pH (5-10) on the initial specific decolourization rate (q0) was studied. As a general rule, a noticeable increase in q0 was observed for pHs higher than 7. For a given pH, q0 increased as a function of the initial OII concentration. Besides, there was an inhibitory effect of high P concentrations on q0. To asses the possibility of reusing the enzyme, repeated additions of OII and P were performed. Results showed that the enzyme remained active after six reuse cycles. A satisfactory accordance between the change of the absorbance during these experiments and absorbances calculated using the proposed model was obtained. Considering that this set of data was not used during the fitting procedure of the model, the agreement between predicted and experimental absorbances provides a powerful validation of the model developed in the present work.
Collapse
Affiliation(s)
- Diego Alberto Morales Urrea
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CCT - Mar del Plata CONICET, Av. Juan B. Justo 4302 (7600), Mar del Plata, Argentina
| | - Patricia Mónica Haure
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CCT - Mar del Plata CONICET, Av. Juan B. Justo 4302 (7600), Mar del Plata, Argentina
- Facultad de Ingeniería, Universidad Nacional de Mar del Plata (UNMdP), Av. Juan B. Justo 4302 (7600), Mar del Plata, Argentina
| | - Fernando Sebastián García Einschlag
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT - La Plata - CONICET, Diag 113 y 64 (1900), La Plata, Argentina
- Facultad de Ingeniería, Universidad Nacional de La Plata (UNLP), Av. 1 #750 (1900), La Plata, Argentina
| | - Edgardo Martín Contreras
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CCT - Mar del Plata CONICET, Av. Juan B. Justo 4302 (7600), Mar del Plata, Argentina.
| |
Collapse
|
13
|
Matafonova G, Batoev V. Recent advances in application of UV light-emitting diodes for degrading organic pollutants in water through advanced oxidation processes: A review. WATER RESEARCH 2018; 132:177-189. [PMID: 29331640 DOI: 10.1016/j.watres.2017.12.079] [Citation(s) in RCA: 176] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 12/04/2017] [Accepted: 12/29/2017] [Indexed: 05/29/2023]
Abstract
Over the last decade, ultraviolet light-emitting diodes (UV LEDs) have attracted considerable attention as alternative mercury-free UV sources for water treatment purposes. This review is a comprehensive analysis of data reported in recent years (mostly, post 2014) on the application of UV LED-induced advanced oxidation processes (AOPs) to degrade organic pollutants, primarily dyes, phenols, pharmaceuticals, insecticides, estrogens and cyanotoxins, in aqueous media. Heterogeneous TiO2-based photocatalysis in lab grade water using UVA LEDs is the most frequently applied method for treating organic contaminants. The effects of controlled periodic illumination, different TiO2-based nanostructures and reactor types on degradation kinetics and mineralization are discussed. UVB and UVC LEDs have been used for photo-Fenton, photo-Fenton-like and UV/H2O2 treatment of pollutants, primarily, in model aqueous solutions. Notably, UV LED-activated persulfate/peroxymonosulfate processes were capable of providing degradation in DOC-containing waters. Wall-plug efficiency, energy-efficiency of UV LEDs and the energy requirements in terms of Electrical Energy per Order (EEO) are discussed and compared. Despite the overall high degradation efficiency of the UV LED-based AOPs, practical implementation is still limited and at lab scale. More research on real water matrices at more environmentally relevant concentrations, as well as an estimation of energy requirements providing fluence-based kinetic data are required.
Collapse
Affiliation(s)
- Galina Matafonova
- Laboratory of Engineering Ecology, Baikal Institute of Nature Management SB RAS, Sakhyanovoy St. 6, Ulan-Ude 670047, Russia.
| | - Valeriy Batoev
- Laboratory of Engineering Ecology, Baikal Institute of Nature Management SB RAS, Sakhyanovoy St. 6, Ulan-Ude 670047, Russia
| |
Collapse
|
14
|
Fabrication of carbon fiber supported zirconium–titanium nanocomposites for efficient photocatalytic decolorization of Orange II dye under visible light irradiation. REACTION KINETICS MECHANISMS AND CATALYSIS 2017. [DOI: 10.1007/s11144-017-1320-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
15
|
Li T, Wang T, Qu G, Liang D, Hu S. Synthesis and photocatalytic performance of reduced graphene oxide-TiO 2 nanocomposites for orange II degradation under UV light irradiation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:12416-12425. [PMID: 28361396 DOI: 10.1007/s11356-017-8927-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 03/23/2017] [Indexed: 06/07/2023]
Abstract
To enhance the photocatalytic activity of TiO2, reduced graphene oxide-TiO2 (RGO-TiO2) composites with sandwich-like structure were synthesized using a simple solvothermal method. The morphology, crystalline information, and structural property of the photocatalyst were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transmission infrared spectroscopy. The photocatalytic performances of the RGO-TiO2 composites were evaluated by the degradation of orange II (AO7) in water under UV light irradiation. The results showed that the RGO-TiO2 composites exhibited much higher photocatalytic activity than TiO2 and that the removal efficiency of AO7 could reach above 95% only after 20 min of UV light irradiation under the optimum condition. The improved photocatalytic activity might be attributed to the improved charge transfer and significant separation of the photoinduced electrons and holes in the presence of a two-dimensional graphene network. The results of recycling experiments show that RGO-TiO2 composites have a high photostability, which is expected in the practical application. Radical trapping experiments indicated that ·OH plays a crucial role in the process of AO7 degradation.
Collapse
Affiliation(s)
- Tengfei Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Tiecheng Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China
| | - Guangzhou Qu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China.
| | - Dongli Liang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China
| | - Shibin Hu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China
| |
Collapse
|