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Photo fenton

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
Alejandro Gallego-Schmid, Raphael Ricardo Zepon Tarpani, Sara Miralles-Cuevas, Alejandro Cabrera-Reina, Sixto Malato, Adisa Azapagic
Scarcity of water and concerns about the ecotoxicity of micro-contaminants are driving an interest in the use of advanced tertiary processes in wastewater treatment plants. However, the life cycle environmental implications of these treatments remain uncertain. To address this knowledge gap, this study evaluates through life cycle assessment the following four advanced process options for removal of micro-contaminants from real effluents: i) solar photo-Fenton (SPF) operating at acidic pH; ii) acidic SPF coupled with nanofiltration (NF); iii) SPF operating at neutral pH; and iv) neutral SPF coupled with NF...
October 1, 2018: Science of the Total Environment
Antonino Fiorentino, Raffaele Cucciniello, Andrea Di Cesare, Diego Fontaneto, Prisco Prete, Luigi Rizzo, Gianluca Corno, Antonio Proto
Photo-Fenton process is among the most effective advanced oxidation processes (AOPs) in urban wastewater treatment and disinfection, but its application as tertiary treatment at full scale has not been a feasible/attractive option so far because optimum conditions are typically achieved under acidic pH. In this work a new photo Fenton like process (UV-C/H2 O2 /IDS-Cu) using iminodisuccinic acid (IDS)-Cu complex as catalyst, was compared to other processes (UV-C/H2 O2 /Cu, UV-C/H2 O2 /Fe, H2 O2 and UV-C) in urban wastewater disinfection...
August 13, 2018: Water Research
Xiaomei Cheng, Lianhai Zu, Yue Jiang, Donglu Shi, Xiaoming Cai, Yonghong Ni, Sijie Lin, Yao Qin
mp-MXene/TiO2-x nanodots (NDs) structurally composed of microporous MXene monolayers embedded with Ti3+-doped TiO2 nanodots were developed for the first time. The drastically enhanced catalytic efficiency (as much as 13 times higher than that of P25) in degrading dye molecules over mp-MXene/TiO2-x NDs is due to a synergistic effect of the pseudo-Fenton reaction and photocatalysis.
October 11, 2018: Chemical Communications: Chem Comm
Edison GilPavas, Izabela Dobrosz-Gómez, Miguel-Ángel Gómez-García
In this study, the potential application of sequential Electrocoagulation + Fenton (F) or Photo-Fenton (PF) + Active carbon adsorption (EC + F/PF + AC) processes were analyzed as alternatives for the treatment of an industrial textile wastewater resulting from an industrial facility located in Medellín (Colombia). In order to maximize the organic matter degradation, each step of the treatment was optimized using the Response Surface Methodology. At first, the optimal performance of EC was achieved with Fe electrodes operating at pH = 7, jEC  = 10 mA/cm2 and 60 rpm, during 10 min of electrolysis...
September 11, 2018: Science of the Total Environment
Gülen Tekin, Gülin Ersöz, Süheyda Atalay
This research focused on the abatement of the model food dye, tartrazine, using visible light photo-Fenton oxidation with novel bismuth oxyhalide catalysts. Bismuth-oxyhalide and metal doped bismuth oxyhalide catalysts (BiOCl, Cu-BiOCl, and Fe-BiOCl) were synthesized via the facile co-precipitation method. The catalysts were characterized by SEM-EDX, XRD, BET, and DRS analyses and the results showed that Cu-BiOCl possess a unique flower-like nanostructure with narrow band gap (2.53 eV) which enhanced its visible light photocatalytic activity remarkably which was proven by catalyst screening experiments...
September 19, 2018: Journal of Environmental Management
Tongjie Yao, Wenjie Jia, Yan Feng, Junshuai Zhang, Yongfu Lian, Jie Wu, Xiao Zhang
In this manuscript, a novel reduced graphene oxide nanosheet/Fex Oy /nitrogen-doped carbon layer (rGS/Fex Oy /NCL) aerogel with Fex Oy NPs sandwiched between rGS and NCL was prepared via a two-step method. Their catalytic performance was evaluated in a photo-Fenton degradation of rhodamine B. It was found that rGS/Fex Oy /NCL aerogel represented higher degradation activity than the sum of rGS/NCL support and Fex Oy NPs, suggesting synergistic effect was established between support and reactive species. The degradation activity was investigated on the basis of aerogel usage, Fex Oy loading, H2 O2 dosage, pH value and RhB concentration...
January 15, 2019: Journal of Hazardous Materials
Francesca Audino, Leandro Oscar Conte, Agustina Violeta Schenone, Montserrat Pérez-Moya, Moisès Graells, Orlando Mario Alfano
A kinetic model describing Fenton and photo-Fenton degradation of paracetamol (PCT) and consumption of hydrogen peroxide (H2 O2 ) was proposed. A set of Fenton and photo-Fenton experiments (18 runs in total) was performed by fixing the initial concentration of PCT to 40 mg L-1 and varying the initial concentrations of H2 O2 and ferrous ion, Fe2+ . The experimental set-up was a well-stirred annular photoreactor equipped with an actinic BL TL-DK 36 W/10 1SL lamp. Experimental results highlighted that PCT is no more detected by HPLC analysis within a minimum reaction time of 2...
September 18, 2018: Environmental Science and Pollution Research International
Swati Singh, Anurag Garg
In a pulp and paper mill, chlorine bleaching of pulp generates toxic aqueous stream containing various chlorophenols (CPs) which are not removed easily by biological process. The objective of the study was to optimize photo-catalytic oxidation reaction for synthetic wastewater containing mixture of mono-, di-, tri- and penta-CPs (i.e., 4-CP; 2,4-DCP; 2,4,6-TCP, and PCP) and evaluate its performance for simulated bleaching effluents produced during pulp bleaching stages. The experimental runs were performed in a glass reactor (capacity = 500 ml) with UV lamp (200-390 nm)...
January 5, 2019: Journal of Hazardous Materials
Palak Bansal, Anoop Verma
Novel FeNAgTiO2 composite beads possessing unusual characteristics of modified in-situ dual process (modified photocatalysis and photo-Fenton) resulted in reduction in treatment time of Cephalexin (CEX). These composite beads were prepared using NAgTiO2 and waste foundry sand (FS) and fly-ash (FA) as alternative source of iron. The modified TiO2 was characterized through SEM/EDS, DRS, XRD, TGA, FTIR, XPS and Raman spectroscopy to affirm the distribution of Ag and N on TiO2 surface. The modified in-situ dual process using FeNAgTiO2 composite beads yielded 77% degradation of CEX after 60 min of solar irradiations with overall synergy of 24% over individual processes...
December 2018: Chemosphere
Lijing Di, Hua Yang, Tao Xian, Xiujuan Chen
In this work, Ag3 PO4 microparticles were decorated onto the surface of BiFeO3 microcuboids through a precipitation method to obtain p-Ag3 PO4 /n-BiFeO3 heterojunction composites. The composites were employed for the degradation of acid orange 7 (AO7) under visible-light irradiation. It is found that the composites exhibit much higher photocatalytic efficiency than bare BiFeO3 . Meanwhile, the intrinsical visible-light-driven photocatalytic activity of Ag3 PO4 /BiFeO3 composites was further confirmed by the degradation of phenol...
August 29, 2018: Nanoscale Research Letters
Ziyuan Xiu, Yan Cao, Zipeng Xing, Tianyu Zhao, Zhenzi Li, Wei Zhou
3D hierarchical Fe3 O4 /Ag/Bi2 MoO6 magnetic microspheres are fabricated through hydrothermal-photoreduction strategy, which fabricate an advanced photocatalytic-Fenton coupling system. The H2 O2 produced by photocatalysis could form the photo-Fenton system when combined with Fe3 O4 under light illumination. The introduction of Ag nanoparticles could induce the localized surface plasmon resonance (LSPR), which provides "hot electrons" for promoting photocatalysis. The addition of Fe3 O4 achieve the successful coupling of photocatalysis-Fenton, and enhanced the broad spectrum response of the final composite sample...
January 1, 2019: Journal of Colloid and Interface Science
Isabelli N Dias, João Paulo Bassin, Márcia Dezotti, Vítor J P Vilar
Polycyclic aromatic hydrocarbons (PAHs) are on the list of priority pollutants to be eliminated from the environment due to their carcinogenic and mutagenic action, chemical stability, and resistance to biodegradation. The aim of this study was to evaluate the degradation of fluorene, a well-known PAH, in aqueous solutions (0.03 and 0.08 mg L-1 ), by means of a solar-driven conventional (PF) and modified photo-Fenton mediated by ferrioxalate complexes (PFF). Photolysis was also employed for comparison purposes...
October 2018: Environmental Science and Pollution Research International
A Cabrera-Reina, S Miralles-Cuevas, G Rivas, J A Sánchez Pérez
This paper represents a first approach in the study of photoreactor selection to treat industrial wastewater using solar photo-Fenton. In this context, simulated textile industry effluent containing a mixture of four dyes at different initial dissolved organic carbon (DOC) concentrations (45, 90, 180 and 270 mg/L) was treated by using three different solar reactor geometries: (i) tubular (5 cm diameter) provided with compound parabolic collector (ii) tubular (5 cm diameter) provided with flat collector and (iii) open channels forming raceway ponds with two liquid depths (5 and 15 cm)...
January 15, 2019: Science of the Total Environment
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...
November 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)...
January 1, 2019: 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
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