Read by QxMD icon Read

Photo fenton

Xiangyun Han, Xi Zhang, Lei Zhang, Mei Pan, Jinlong Yan
The photodegradation of benzothiazole (BTH) in wastewater with the coexistence of iron oxides and oxalic acid under UV light irradiation was investigated. Results revealed that an effective heterogeneous photo-Fenton-like system could be set up for BTH abatement in wastewater under UV irradiation without additional H2 O2 , and 88.1% BTH was removed with the addition of 2.0 mmol l-1 oxalic acid and 0.2 g l-1 α-Fe2 O3 using a 500 W high-pressure mercury lamp (365 nm). The degradation of BTH in the photo-Fenton-like system followed the first-order kinetic model...
June 2018: Royal Society Open Science
Shaobin Sun, Hong Yao, Wanyi Fu, Likun Hua, Guangshan Zhang, Wen Zhang
To develop reactive and antifouling membrane filtration systems, a photo-Fenton ceramic membrane was prepared by coating goethite (α-FeOOH) catalysts on a zirconia/titania alumina membrane via a cross-linking method. Scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to characterize α-FeOOH catalysts and the surface coating quality. The cross linker yielded stable covalent binding between catalyst and membrane under room temperature and produced a homogeneous and smooth coating of catalyst on ceramic membranes...
August 4, 2018: Water Research
Anna Serra-Clusellas, Laura De Angelis, Chung-Ho Lin, Phuc Vo, Mohamed Bayati, Lloyd Sumner, Zhentian Lei, Nathalia B Amaral, Liliana M Bertini, Jose Mazza, Luis R Pizzio, Jorge D Stripeikis, Julián A Rengifo-Herrera, María M Fidalgo de Cortalezzi
The Photo-Fenton-like (PF-like) process with minute Fe(III) concentrations and the Hydrogen Peroxide Photolysis (HPP), using Xe-lamp or solar light as sources of irradiation, were efficiently applied to eliminate the herbicide 2,4-D from water. PF-like experiments concerning ferric and H2 O2 concentrations of 0.6 mg L-1 and 20 mg L-1 respectively, using Xenon lamps (Xe-lamps) as a source of irradiation and 2,4-D concentrations of 10 mg L-1 at pH 3.6, exhibited complete 2,4-D degradation and 77% dissolved organic carbon (DOC) removal after 30 min and 6 h of irradiation respectively whereas HPP (in absence of ferric ions) experiments showed a 2,4-D reduction and DOC removal of 90% and 7% respectively after 6 h of irradiation...
July 31, 2018: Water Research
Antonio Durán, José María Monteagudo, Israel San Martín
The removal of pharmaceuticals present in wastewater is receiving more and more attention since most of them are refractory to traditional biological treatments. Many advanced oxidation processes have been reported in literature. However, cost estimations are not available for most of them. Recently, more environment friendly processes using solar radiation are gaining importance. The solar photo-Fenton process has been used with different reactor configurations and scales and seems to be the most promising technology for reducing operation costs...
July 28, 2018: Chemosphere
Francesca Audino, Gerard Campanyà, Montserrat Pérez-Moya, Antonio Espuña, Moisès Graells
The photo-Fenton process is a photochemical process that has proved to be highly efficient in degrading new potentially harmful contaminants. Despite of this, scarce attention has been paid to the development of systematic procedures and optimisation strategies to efficiently operate such a process. The present work aims at investigating the effectiveness of a model-based approach in carrying out the dynamic optimisation of the recipe of a photo-Fenton process, performed in fed-batch mode (reactant dosage)...
July 29, 2018: Science of the Total Environment
Abdoulaye Thiam, Ignasi Sirés, Ricardo Salazar, Enric Brillas
The destruction of the herbicide chloramben in 0.050 M Na2 SO4 solutions at natural pH has been studied by photoelectro-Fenton with UVA light (PEF). The trials were carried out in a cell equipped with an air-diffusion cathode for H2 O2 generation and different electrocatalytic anodes, namely active IrO2 -based and RuO2 -based electrodes and non-active boron-doped diamond (BDD) and PbO2 ones. Similar removal rates were found regardless of the anode nature because the herbicide was mainly oxidized by OH formed from Fenton's reaction, which was enhanced by UVA-induced photo-Fenton reaction...
October 15, 2018: Journal of Environmental Management
Fuzhen Liu, Jia Ai, Hui Zhang, Yao-Hui Huang
The imidacloprid was mineralized by heterogeneous photo-Fenton process in a three-phase fluidized bed reactor using waste iron oxide as catalyst. The effects of catalyst loading, dosage of H2 O2 and pH were investigated to determine the optimal experiments conditions. The results revealed that TOC removal efficiency increases with an increase in H2 O2 dosage of up to 105.0 mM, an increase in catalyst dosage from 1.0 to 5.0 g L‒1 , and a decrease in pH from 5.0 to 3.5. Under the optimal conditions, 97.7% TOC removal was achieved in 6 h under 254-nm UV irradiation...
July 27, 2018: Environmental Technology
Irene García-Fernández, Sara Miralles-Cuevas, Isabel Oller, Sixto Malato, Pilar Fernández-Ibáñez, María Inmaculada Polo-López
Photo-Fenton is a solar disinfection technology widely demonstrated to be effective to inactivate microorganisms in water by the combined effect of photoactivated iron species and the direct action of solar photons. Nevertheless, the precipitation of iron as ferric hydroxide at basic pH is the main disadvantage of this process. Thus, challenge in photo-Fenton is looking for alternatives to iron salts. Polycarboxylic acids, such as Ethylendiamine-N',N'-disuccinic acid (EDDS), can form strong complex with Fe3+ and enhance the dissolution of iron in natural water through photochemical process...
July 10, 2018: Journal of Hazardous Materials
Hongxia Lin, Yuxi Liu, Jiguang Deng, Kunfeng Zhang, Xing Zhang, Shaohua Xie, Xingtian Zhao, Jun Yang, Zhuo Han, Hongxing Dai
Three-dimensionally ordered mesoporous Fe2 O3 (meso-Fe2 O3 ) and its supported Au, Pd, and Au-Pd alloy (xAuPdy /meso-Fe2 O3 ; x=0.08-0.72wt.%; Pd/Au molar ratio (y)=1.48-1.85) photocatalysts have been prepared via the KIT-6-templating and polyvinyl alcohol-protected reduction routes, respectively. Physical properties of the samples were characterized, and their photocatalytic activities were evaluated for the photocatalytic oxidation of acetone in the presence of a small amount of H2 O2 under visible-light illumination...
August 2018: Journal of Environmental Sciences (China)
Graziele Elisandra do Nascimento, Daniella Carla Napoleão, Rayany Magali da Rocha Santana, Lívia Vieira Carlini Charamba, Julierme Gomes Correia de Oliveira, Maiara Celine de Moura, Luana Cassandra Breitenbach Barroso Coelho, Marta Maria Menezes Bezerra Duarte
In this work, the degradation of Remazol Yellow Gold RNL-150% and Reactive Turquoise Q-G125 were investigated using AOP: photolysis, UV/H2 O2 , Fenton and photo-Fenton. It was found that the photo-Fenton process employing sunlight radiation was the most efficient, obtaining percentages of degradation above 87%. The ideal conditions for the degradation of the dyes were determined from a factorial design 23 and study of the [H2 O2 ] ([H2 O2 ] equal to 100 mg·L-1 ); [Fe] equal to 1 mg·L-1 and pH between 3 and 4...
July 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Hélcio José Izário Filho, Adriano Francisco Siqueira, Marco Aurélio Kondracki de Alcântara, Leandro Gonçalves Aguiar, Alessandro Sampaio Cavalcanti
Natural effluents with marked variation in their chemical composition over decomposition time in the matrix from which they are generated have a complex composition and are not totally known in most cases. Landfill leachate can be considered an effluent with complex composition, requiring imminent and more comprehensive studies on organic load degradation. Such complexity of numerous organic compounds (most of them recalcitrant humic and fulvic substances) demands a large number of kinetic equations to satisfactorily describe the temporal evolution of such conversion...
July 26, 2018: Environmental Technology
Kamel Shoueir, Hamdy El-Sheshtawy, Mohammed Misbah, Hamza El-Hosainy, Ibrahim El-Mehasseb, Maged El-Kemary
High efficient 3,5-Dinitrosalicylic acid/Chitosan/MnFe2 O4 (DNSA@CS@MnFe2 O4 ) nano photocatalyst was prepared to enrich both adsorption and photodecomposition under visible light. This paper focused on the importance of DNSA@CS as an excellent connector between methylene blue (MB) and MnFe2 O4 for accelerating photodegradation with the encouragement of photo-Fenton catalytic reagent hydrogen peroxide (H2 O2 ). The optimum conditions were: contact time, 30 min, H2 O2 concentration, 0.16 M, pH factor 9 and dosage 0...
October 1, 2018: Carbohydrate Polymers
Fei Chang, Feiyan Wu, JiaoJiao Zheng, Wenbo Cheng, Wenjing Yan, Baoqing Deng, Xuefeng Hu
A set of binary composites α-Fe2 O3 /Bi12 O17 Cl2 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...
July 3, 2018: Chemosphere
Luciano de Oliveira Gonçalves, Maria Clara V M Starling, Cintia Dutra Leal, Daniel V M Oliveira, Juliana Calábria Araújo, Mônica Maria D Leão, Camila C Amorim
In the present study, a multistage route is proposed for the treatment of biodiesel industry wastewater (BWW) containing around 1000 mg L-1 of total organic carbon (TOC), 3500 mg L-1 of chemical oxygen demand (COD), and 1325 mg L-1 of oil and grease. Initially, BWW aerobic biodegradability was assessed via Zhan-Wellens biodegradability test to confirm the appropriate treatment route. Then, a hybrid moving bed bioreactor (MBBR) system was chosen as the first treatment stage. The hybrid MBBR achieved 69 and 68% removal of COD and TOC removals, respectively, and provided great conditions for biomass growth...
July 11, 2018: Environmental Science and Pollution Research International
Stefanos Giannakis, Truong-Thien Melvin Le, Jose Manuel Entenza, Cesar Pulgarin
The emergence of antibiotic resistance represents a major threat to human health. In this work we investigated the elimination of antibiotic resistant bacteria (ARB) by solar light and solar photo-Fenton processes. As such, we have designed an experimental plan in which several bacterial strains (Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae) possessing different drug-susceptible and -resistant patterns and structures (Gram-positive and Gram-negative) were subjected to solar light and the photo-Fenton oxidative treatment in water...
June 26, 2018: Water Research
Matthew J MacDonald, Dong-Wan Cho, Iris K M Yu, Daniel C W Tsang, Alex C K Yip
A new and environmentally benign photocatalyst is introduced in this study, which was synthesized via incipient wetness impregnation onto MIL-47(V) using an ethanolic Fe(III) chloride solution. The resultant materials were characterized by XRD, FE-SEM, and HR-TEM analyses. The photocatalytic capability of Fe/MIL-47 towards removal of methylene blue (MB) was evaluated in comparison to MIL-53(Al), Cu/MIL-47, and Fe/zeolite-Y. The unmodified MIL-47 achieved 55% MB removal after 20-min exposure to UV/H2 O2 , through photodegradation as the dominant mechanism...
July 5, 2018: Science of the Total Environment
Da Zhang, Hao Xu, Xiaolong Zhang, Yubin Liu, Ming Wu, Juan Li, Huanghao Yang, Gang Liu, Xiaolong Liu, Jingfeng Liu, Zhen Yuan
The nanosized metal-organic particles (NMOPs) recently have attracted tremendous attentions in biomedical applications. However, few studies have developed metal-organic nanoparticles (NMOPs) as near-infrared (NIR) II phototherapeutic agents and as Fenton-like agents for cancer theranostics. Herein, directly using organic dye and Cu(II)-ion complexes to construct NMOPs, as dual-mode therapeutic agent for PA imaging-guided photochemotherapy in NIR II window, is reported. The NMOPs are simply an assembly of Cu(II) ion and tetrahydroxyanthraquinone (THQ) complexes [Cu(II)-THQ] n through the coordination effect, van der Waals force, and π-π interactions...
August 1, 2018: ACS Applied Materials & Interfaces
Diana Martínez-Pachón, Paula Espinosa-Barrera, Javier Rincón-Ortíz, Alejandro Moncayo-Lasso
In this work photo-electro-Fenton (PEF) processes using a dimensionally stable anode-gas diffusion electrode (DSA-GDE) system under light emission diodes (LED)-type radiation were used in the degradation of the angiotensin-II-receptor antagonists (ARA II), valsartan (VAL), and losartan (LOS), which are used in the treatment of hypertension diseases, and are considered among the emerging contaminants (ECs). Organic acids as citric, tartaric, and oxalic acids were used as complexing agents of iron ions in order to maintain the performance of the Fenton reaction at near-neutral pH value...
July 4, 2018: Environmental Science and Pollution Research International
Xiao-Zeng Miao, Hui-Wang Dai, Jian-Xin Chen, Bo-Quan Jiang, Xian Gong
α -FeOOH was prepared by a symmetrical precipitation method and characterized by XRD, FT-IR, SEM, BET, and EDS techniques. The oxalate enhanced experiment for the catalytic activity of α -FeOOH during the degradation of Orange Ⅱ by the heterogeneous UV-Fenton process was evaluated. The results showed that the rate of Orange Ⅱ degradation in this heterogeneous UV-Fenton system could increase significantly with oxalate as an enhancing reagent, with the peak values of enhanced efficiency reaching 116.9% when the concentration of additional oxalate was 0...
March 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Qiao Wang, Peng Xu, Guangshan Zhang, Wen Zhang, Limin Hu, Peng Wang
A series of Fe-doped ZnS (Fex-ZnS) photocatalysts were synthesized using a one-pot hydrothermal method. The physicochemical properties of the as-prepared Fex-ZnS microspheres were characterized by different microscopic and spectroscopic techniques. Fe doping did not obviously change the morphology and crystallinity of ZnS, but effectively broadened the light response range into the visible-light region. Degradation of p-nitrophenol (PNP) was used to evaluate the photocatalytic performance of the Fex-ZnS catalysts under visible light irradiation with the addition of H2O2 to facilitate photo-Fenton-like reactions...
July 11, 2018: Physical Chemistry Chemical Physics: PCCP
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"