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Photo fenton

Peng Zhang, Jingping Hu, Bingchuan Liu, Jiakuan Yang, Huijie Hou
Porphyrin-based chemistry has reached an unprecedented period of rapid development after decades of study. Due to attractive multifunctional properties, porphyrins and their analogues have emerged as multifunctional organometals for environmental and energy purposes. In particular, pioneer works have been conducted to explore their application in pollution abatement, energy conversion and storage and molecule recognition. This review summarizes recent advances of porphyrins chemistry, focusing on elucidating the nature of catalytic process...
December 4, 2018: Chemosphere
Lianmei Wei, Yi Zhang, Shengwen Chen, Luping Zhu, Xiaoyu Liu, Lingxue Kong, Lijun Wang
Phosphate residue is regarded as a hazardous waste, which could potentially create significant environmental and health problems if it is not properly treated and disposed of. In this study, nitrogen-doped carbon nanotubes-FePO4 (NCNTs-FePO4 ) composite was successfully synthesized from phosphate residue, and its application as an effective catalyst was explored. Firstly, an effective method was developed to recover FePO4 from phosphate residue, achieving an impressive FePO4 mass recovery rate of 98.14%. Then, the NCNTs-FePO4 catalyst was synthesized from the recovered FePO4 by two main reactions, including surface modification and chemical vapor deposition...
February 2019: Journal of Environmental Sciences (China)
Jian Zhang, Mingyu Zhan, Lulu Zheng, Chen Zhang, Guodong Liu, Jingquan Sha, Shaojie Liu, Shuo Tian
To enhance the Fenton catalytic performance in a neutral solution under indoor sunlight, a novel FeOCl/polyoxometalate (POM) (FeOCl/POM-W and FeOCl/POM-Mo) composite was successfully synthesized for the first time, which shows significantly improved Fenton catalytic activity and stability for phenol degradation compared with FeOCl. Furthermore, the degradation constants ( k) of FeOCl/POM-Mo (0.08 min-1 ) and FeOCl/POM-W (0.06 min-1 ) are a factor of 4 and 3 times greater than that of FeOCl (0.02 min-1 ), respectively...
December 11, 2018: Inorganic Chemistry
Natalia Lopez-Saavedra, Luis F Muñoz-Delgado, Jose A Lara-Ramos, Fiderman Machuca-Martinez
Emerging contaminants (EC) are an imminent risk due to potential toxicity to aquatic ecosystems and human beings. This type of contaminants is found in low concentrations and usually present incomplete or inefficient removal by conventional treatments, which entail its permanence and constant increase. Advanced Oxidation Processes (AOP) are an alternative for the elimination of dangerous and resistant substances in wastewater. So, this research evaluates the caffeine degradation in aqueous solution by AOP, such as: Fenton, Electro-Oxidation (EO) with boron doped diamond (BDD) electrodes, Electro-Fenton (EF) and Photo-Electro-Fenton (PEF)...
December 2018: Data in Brief
Fatemeh Rezaei, Davide Vione
Heterogeneous Fenton processes with solid catalysts have gained much attention for water and wastewater treatment in recent years. In the field of solid catalysts, zero valent iron (ZVI) is among the most applicable due to its stability, activity, pollutant degradation properties and environmental friendliness. The main limitation in the use of ZVI in heterogeneous Fenton systems is due to its deactivation in neutral and alkaline conditions, and Fenton-like processes have been developed to overcome this difficulty...
November 29, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Lijing Di, Hua Yang, Tao Xian, Xiujuan Chen
In this work, ternary all-solid-state Z-scheme g-C₃N₄/carbon nanotubes/Bi₂Fe₄O₉ (g-C₃N₄/CNT/BFO) composites with enhanced photocatalytic activity were prepared by a hydrothermal method. The morphology observation shows that ternary heterojunctions are formed in the g-C₃N₄/CNT/BFO composites. The photocatalytic activity of the samples for the degradation of acid orange 7 was investigated under simulated sunlight irradiation. It was found that the ternary composites exhibit remarkable enhanced photocatalytic activity when compared with bare BFO and g-C₃N₄/BFO composites...
November 22, 2018: Micromachines
Shanshan Su, Yuyang Liu, Xuemin Liu, Wei Jin, Yaping Zhao
To enhance the catalytic and separation properties of akaganéite nanoparticles, rice spike-like akaganéite impregnated graphene oxide (β-FeOOH@GO) nanocomposite was fabricated through facile hydrolysis. The apparent first-order decolorization rate of methylene blue (MB) in β-FeOOH@GO catalyzed photo Fenton-like system was 0.6322 min-1 about 3 folds that of prinstine β-FeOOH nanoparticles. The degradation intermediates of MB adsorbed on the solid surface of β-FeOOH@GO were comprehensively identified with time of flight-secondary ion mass spectroscopy (TOF-SIMS) for the first time...
November 16, 2018: Chemosphere
Zhihong Ye, Ignasi Sirés, Hui Zhang, Yao-Hui Huang
This work reports the use of ferrioxalate complexes to assist solar photo-Fenton treatment of pentachlorophenol (PCP) in aqueous medium at mild pH, which inhibits the precipitation of iron hydroxides and allows working at a low iron dosage. The experimental parameters were optimized by assessing the effect of initial concentrations of H2 O2 (0-2.5 mM) and Fe(II) (2-10 mg/L), pH (3.0-9.0) and iron/oxalic acid molar ratios (1:0-1:13.5) on total organic carbon (TOC) removal. Ferrioxalate-assisted solar photo-Fenton achieved 97...
November 2, 2018: Chemosphere
Japhet Cheuk-Fung Law, Kelvin Sze-Yin Leung
Widely recognized as a promising approach to degrading recalcitrant pollutants, Advanced Oxidation Processes (AOPs) have drawn much attention for their effectiveness and efficiency. Among all the AOPs, the Fenton system has been widely applied for oxidation and mineralization of micropollutants due to its ease of implementation and high catalytic efficiency. However, the necessity of preceding acidification, together with rapid consumption and slow regeneration of Fe(II) resulting in deterioration of reactivity, has reduced its competitiveness as a practical option for water treatment...
November 5, 2018: Chemosphere
Eduardo Gatica, David Possetto, Agustina Reynoso, José Natera, Sandra Miskoski, Eduardo De Gerónimo, Mabel Bregliani, Adriana Pajares, Walter A Massad
The proherbicide Isoxaflutole (IXF) hydrolyzes spontaneously to diketonitrile (DKN) a phytotoxic compound with herbicidal activity. In this work, the sensitized degradation of IXF using Riboflavin (Rf), a typical environmentally friendly sensitizer, Fenton and photo-Fenton processes has been studied. The results indicate that only the photo-Fenton process produces a significant degradation of the IXF. Photolysis experiments of IXF sensitized by Riboflavin is not a meaningful process, IXF quenches the Rf excited triplet (3 Rf*) state with a quenching rate constant of 1...
November 7, 2018: Photochemistry and Photobiology
Anderson Teodoro, Amilcar Machulek Júnior, Marc Árpád Boncz, Paula Loureiro Paulo
Greywater presents great potential for reuse; if treated correctly and efficiently, it can be used for several residential uses. The objective of this work was to test advanced oxidation for greywater disinfection through UV/TiO2 , UV/TiO2 /H2 O2 , photo-Fenton, UV/H2 O2 and photolysis (UV) processes, using Pseudomonas aeruginosa as an alternative indicator. In general, the processes with hydrogen peroxide (150 mg.L-1 ) mixed in the pretreated greywater and exposed to solar radiation or artificial radiation from UV lamps were the most efficient in the disinfection experiments, with total inactivation of P...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Mohammad Malakootian, Mohammad Reza Heidari
Phenol and its derivatives are available in various industries such as refineries, coking plants, steel mills, drugs, pesticides, paints, plastics, explosives and herbicides industries. This substance is carcinogenic and highly toxic to humans. The purpose of the study was to investigate the removal of phenol from wastewater of the steel industry using the electrocoagulation-photo-Fenton (EC-PF) process. Phenol and chemical oxygen demand (COD) removal efficiency were investigated using the parameters pH, Fe2+ /H2 O2 , reaction time and current density...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Patrícia S M Santos, Helena B Cardoso, Teresa A P Rocha-Santos, Armando C Duarte
This work evaluates the degradation of benzoic acid, a tracer from biomass burning, by different oxidation agents (Fe (III); H2 O2 ; sunlight; and combinations of the previous ones) in model solutions and in real atmospheric waters. The extent of reactions was assessed by Ultraviolet-Visible and molecular fluorescence spectroscopies. The oxidation of benzoic acid occurred with the chemical oxidants Fe (III), H2 O2 , Fe (III) and H2 O2 simultaneously in the presence of sunlight, and with Fe (III) and H2 O2 simultaneously in the absence of light...
January 2019: Environmental Pollution
Vu Khac Hoang Bui, Tuyet Nhung Pham, Young-Chul Lee
Fe₃O₄ nanoparticles (NPs) have been widely used in photo-Fenton catalysis applications for water/waste water treatment. Their drawbacks, however, continue to limit their potential. In the present study, we synthesized magnesium aminoclay-iron oxide [MgAC-Fe₃O₄] nanocomposites in DI water solution by treated them under 4% H2/Ar for 3 hours in a 500 °C furnace. Obtained X-ray diffraction (XRD) patterns confirmed that the growth of the Fe₃O₄ NPs in the amorphous MgAC; also, scanning electron microscopy (SEM) images indicated that the MgAC-Fe₃O₄ nanocomposites were in an aggregated form of 170±117 nm average-diameter...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Xiaohua Pan, Yan Zhang, Xiaobo Sun, Wei Pan, Jinping Wang
Since different quenching mechanisms can endow carbon dots (CDs) with diverse responsive manners, multi-mode sensing can in principle be achieved by a single carbon-dot-based sensor. In this work, green emissive CDs were prepared by simple hydrothermal pyrolysis of phenolphthalein and ethylenediamine at 180 °C for 5 h, with a quantum yield of 17%. The as-prepared CDs can be selectively quenched by Hg2+ due to their specific binding affinity causing photo-induced electron transfer (PET). Due to the inner filter effect (IFE), the CDs also showed intensive fluorescent response to lemon yellow dye...
November 19, 2018: Analyst
Mehdi Ghanbarzadeh Lak, Mohammad Reza Sabour, Elnaz Ghafari, Allahyar Amiri
The main objective of this study is to investigate the application of Photo-Fenton process to treat landfill leachate with minimum energy consumption and maximum COD removal efficiencies, simultaneously. Accordingly, an operational assessment of Photo-Fenton process was conducted in terms of variables, namely oxidation pH, [H2 O2 ]/[Fe2+ ] molar ratio, and Fe2+ dosage. The Central Composite Design (CCD) based on Response Surface Methodology (RSM) was applied for statistical analysis and optimization of target parameters...
September 2018: Waste Management
Afshin Davarpanah
Water reuse is considered one of the most efficient and optimum ways in petroleum industries to address the water scarcity problem. The effluents which are made by the petroleum operations are supposed to be one of the hazardous materials when they are discharged to the environment. The objective of this study is to measure the volume of the required water for the operational performances of the studied oil field. To do this, the necessary water and the volume of provided treated water for the waterflooding, tertiary flooding, and hydraulic fracturing procedures are appropriately measured and by the utilization of photo-Fenton/flotation are administered to remove the oil droplets...
October 20, 2018: Environmental Science and Pollution Research International
Diego R V Guelfi, Enric Brillas, Fábio Gozzi, Amílcar Machulek, Silvio C de Oliveira, Ignasi Sirés
The main objective of this work is to demonstrate the viability of solar photoelectro-Fenton (SPEF) process to degrade pesticides in urban wastewater matrix, selecting the herbicide bentazon as a model molecule. In order to provide a correct assessment of the role of the different oxidants and catalysts involved, bentazon was comparatively treated by anodic oxidation with electrogenerated H2 O2 (AO-H2 O2 ), electro-Fenton (EF) and UVA-assisted EF (i.e., PEF) processes as well, either in sulfate or chloride media...
October 17, 2018: Journal of Environmental Management
Yongchun Ye, Hua Yang, Haimin Zhang, Jinling Jiang
Ag2 CrO4 nanoparticles (10‒35 nm) were assembled onto LaFeO3 nanoparticles (20‒60 nm) via a facile chemical precipitation method to form novel Ag2 CrO4 -LaFeO3 heterojunction composite photocatalysts. The prepared Ag2 CrO4 -LaFeO3 composites were characterized by XRD, SEM, TEM, XPS, BET, UV-vis DRS, PL spectroscopy and EIS and photocurrent response. The TEM result clearly shows that Ag2 CrO4 particles are decorated onto LaFeO3 particles to form Ag2 CrO4 -LaFeO3 heterojunction. Compared to bare LaFeO3 , the 10%Ag2 CrO4 -LaFeO3 composite exhibits slightly increased BET specific surface area, increased photocurrent density, decreased charge-transfer resistance and decreased PL emission peaks...
October 19, 2018: Environmental Technology
Palak Bansal, Anoop Verma, Charu Mehta, Vikas Kumar Sangal
In this study, degradation of a pharmaceutical drug, Phenazone (PNZ) has been carried out via heterogeneous photocatalysis, photo-Fenton and in-situ dual process (photocatalysis + photo-Fenton) in suspension and fixed-mode under artificial UV-A as well as under natural solar radiations. Waste material such as foundry sand (FS) was exploited as a supplement for iron in case of photo-Fenton reaction. The distinct processes including photocatalysis and photo-Fenton were found to be competent for the degradation of PNZ as both processes revealed an almost 90-95% removal of PNZ after 180 min of UV irradiations...
October 8, 2018: Journal of Environmental Management
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