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Photo fenton

María A De León, Marta Sergio, Juan Bussi, Guadalupe B Ortiz de la Plata, Orlando M Alfano
A regional raw clay was used as the starting material to prepare iron-pillared clays with different iron contents. The catalytic activity of these materials was tested in the heterogeneous photo-Fenton process, applied to the degradation of 2-chlorophenol chosen as the model pollutant. Different catalyst loads between 0.2 and 1.0 g L-1 and pH values between 3.0 and 7.0 were studied. The local volumetric rate of photon absorption (LVRPA) in the reactor was evaluated solving the radiative transfer equation applying the discrete ordinate method and using the optical properties of the catalyst suspensions...
March 16, 2019: Environmental Science and Pollution Research International
Arlen Mabel Lastre-Acosta, Rafael Vicente, Margarita Mora, Ulises Javier Jáuregui-Haza, Antonio Arques, Antonio Carlos Silva Costa Teixeira
Urban-waste bio-organic substances (UW-BOS) have been shown to be capable of extending the photo-Fenton reaction to mildly acidic conditions. In this study, the effects of pH (3-7), UW-BOS, H2 O2 and iron concentrations on the photo-Fenton process were systematically assessed using a Doehlert experimental design and response surface methodology for two UW-BOS (CVT230 and FORSUD). Solutions of the model antibiotic sulfadiazine (SDZ) were irradiated in a solar simulator equipped with a 550 W Xenon lamp. The results showed that for UW-BOS contents below 30 mg L-1 , SDZ removal proceeds at pH 5 with similar rates for both CVT230 and FORSUD, regardless of Fe(III) concentration...
March 15, 2019: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Lijing Di, Hua Yang, Tao Xian, Xueqin Liu, Xiujuan Chen
Z-scheme Ag₂S/BiFeO₃ heterojunction composites were successfully prepared through a precipitation method. The morphology and microstructure characterization demonstrate that Ag₂S nanoparticles (30⁻50 nm) are well-decorated on the surfaces of polyhedral BiFeO₃ particles (500⁻800 nm) to form Ag₂S/BiFeO₃ heterojunctions. The photocatalytic and photo-Fenton catalytic activities of the as-derived Ag₂S/BiFeO₃ heterojunction composites were evaluated by the degradation of methyl orange (MO) under visible-light irradiation...
March 9, 2019: Nanomaterials
V Godvin Sharmila, S Adish Kumar, J Rajesh Banu, Ick Tae Yeom, Ganesh Dattatraya Saratale
In this study, an attempt has been made to reduce the sludge using novel homogenizer coupled solar photo Fenton (HPF) process. At an optimum pH of 3 and Fe2+ to H2 O2 dosage of 1:6, PF process yielded 63.7% solids reduction at a time interval of 45 min. Coupling of homogenizers with photo Fenton (PF) process effectively enhanced treatment efficiency. When homogenizer (specific energy - 1150.694 kJ/kg TS) was coupled with PF, a sharp increase in solid reduction 73.5% and decrease in reaction time (20 min) were observed...
March 7, 2019: Journal of Environmental Management
L Fernández, M Gamallo, M A González-Gómez, C Vázquez-Vázquez, J Rivas, M Pintado, M T Moreira
The purpose of this research was the preparation and photocatalytic evaluation of a novel nanocomposite (NC) based on Fe3 O4 /ZnO, to eliminate four persistent antibiotics in surface waters: sulfamethoxazole, trimethoprim, erythromycin and roxithromycin. Prior to the operation of the photocatalytic reactor, the influence of pH (3-9), catalyst concentration (50-800 mg L-1) , oxidant dose (0-100 mg L- 1 ) and concentration of different targets (10-100 μg L-1 ) on the catalytic efficiency was evaluated...
February 28, 2019: Journal of Environmental Management
Efraim A Serna-Galvis, Ana María Botero-Coy, Diana Martínez-Pachón, Alejandro Moncayo-Lasso, María Ibáñez, Félix Hernández, Ricardo A Torres-Palma
The simultaneous degradation of seventeen emerging concern pollutants in effluent from the municipal wastewater treatment plant (MWTP) of Bogotá-Colombia was studied using high frequency ultrasound (375 kHz). The considered compounds in the effluent corresponded to pharmaceuticals (diclofenac, carbamazepine, venlafaxine, ciprofloxacin, norfloxacin, valsartan, losartan, irbesartan, sulfamethoxazole, clarithromycin, azithromycin, erythromycin, metronidazole, trimethoprim and clindamycin); cocaine and its major metabolite benzoylecgonine...
February 5, 2019: Water Research
Feifei Wang, Xiaolin Yu, Maofa Ge, Sujun Wu, Juan Guan, Junwang Tang, Xiao Wu, Robert O Ritchie
A novel self-assembly method was developed to prepare a γ-Fe2 O3 /graphene oxide (GO) heterogeneous catalyst that showed excellent synergy between photocatalysis and Fenton-like reactions. The γ-Fe2 O3 /GO catalyst prepared on the iron plates demonstrated efficient and reproducible catalytic activities for water treatment. It takes only 80 min to degrade 50 mg L-1 methylene (MB) completely, which is the main non-biodegradable dye in wastewater from the textile industry. The heterogeneous catalyst is stable over a wide range of pH (from 2...
January 29, 2019: Environmental Pollution
Huasheng Lai, Guangran Ma, Wenjuan Shang, Danjiao Chen, Yuyin Yun, Xia Peng, Fugang Xu
A ternary hybrid, MNPs-MoS2 @Au, composed of gold nanoparticles (AuNPs) grown on a magnetic sphere (MNPs)-MoS2 microflower composite (MNPs-MoS2 ) was proposed for surface-enhanced Raman scattering (SERS) detection and visible-light photo-Fenton degradation of aromatic dyes. The hybrid was prepared by sequential solvothermal growth of MNPs and MoS2 , and electroless deposition of AuNPs. A comparison of results revealed that the synergy among these components endowed the hybrid with a much higher SERS enhancement ability than MNPs, or MNPs@MoS2 ...
February 14, 2019: Chemosphere
Teh Sabariah Binti Abd Manan, Taimur Khan, Subarna Sivapalan, Hisyam Jusoh, Nasiman Sapari, Ariyanti Sarwono, Raihan Mahirah Ramli, Sabtanti Harimurti, Salmia Beddu, Siti Nabihah Sadon, Nur Liyana Mohd Kamal, Amirhossein Malakahmad
Polycyclic aromatic hydrocarbons (PAHs) are carcinogenic compounds, composed of benzene rings. The objective of this research was to identify the optimum condition for the degradation of PAHs contaminated water using photo-Fenton oxidation process via response surface methodology (RSM). Aqueous solution was prepared and potable water samples were collected from water treatment plants in Perak Tengah, Perak, Malaysia in September 2016. The reaction time, pH, molarity of H2 O2 and FeSO4 were analyzed followed by RSM using aqueous solution...
February 6, 2019: Science of the Total Environment
Ana Kovačič, Celine Gys, Tina Kosjek, Adrian Covaci, Ester Heath
Bisphenols (BPs) are industrial chemicals that are used as monomers in the production of polycarbonate plastics and epoxy resins. These compounds can leach into the aqueous environment, where they can potentially have toxic effects. The aim of this study was to assess the photochemical degradation of three common bisphenols: BPF, BPS and BPZ in aqueous solution and determine their degradation kinetics and characterise their transformation products. Three independent experiments were performed based on: 1) direct photolysis using UV irradiation, 2) cyclodextrin-enhanced photolysis and 3) the photo-Fenton reaction...
February 5, 2019: Science of the Total Environment
Zhe Chen, Yuting Gao, Dongzhao Mu, Hongfei Shi, Dawei Lou, Shu-Yuan Liu
A photo-Fenton-like reaction was considered as an effective method for wastewater treatment because it could produce more oxidative species such as hydroxyl radicals (˙OH) to accelerate the reaction. In this paper, a NiFe2O4/C (abbr. as NFO/C) yolk-shell nanostructure was synthesized via one-step calcination using polyacrylic acid sodium salt (PAAS) NPs as a template. The nanocomposite was characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption, among others...
February 13, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Francesca Audino, Jorge Mario Toro Santamaria, Luis J Del Valle Mendoza, Moisès Graells, Montserrat Pérez-Moya
Fenton, photo-Fenton, and photo-induced oxidation, were investigated and compared for the treatment of 0.26 mmol L-1 of paracetamol (PCT) in a deionised water matrix, during a reaction span of 120.0 min. Low and high Fenton reagent loads were studied. Particularly, the initial concentration of Fe2+ was varied between 0.09 and 0.18 mmol L-1 while the initial concentration of H₂O₂ was varied between 2.78 and 11.12 mmol L-1 . The quantitative performance of these treatments was evaluated by: (i) measuring PCT concentration; (ii) measuring and modelling TOC conversion, as a means characterizing sample mineralization; and (iii) measuring cytotoxicity to assess the safe application of each treatment...
February 11, 2019: International Journal of Environmental Research and Public Health
Shuhui Sun, Shu Wang, Yuxuan Ye, Bingcai Pan
Considerable amount of phosphorous is present as organic phosphonates (usually in the form of metal complexes, e.g., Ca(II)-phosphonate) in domestic and industrial effluents, which cannot be effectively removed by traditional processes for phosphate. Herein, we employed a proprietary process, i.e., Fe(III) displacement/UV irradiation/co-precipitation (denoted Fe(III)/UV/NaOH), to enable an efficient removal of Ca(II)-phosphonate complexes from water. The combined process includes three basic steps, i.e., Fe(III) replacement with the complexed Ca(II) to form Fe(III)-phosphonate of high photo-reactivity, UV-mediated degradation of Fe(III)-phosphonate to form phosphate and other intermediates, and the final phosphorous removal via co-precipitation at pH = 6...
January 16, 2019: Water Research
Αnastasia Koltsakidou, Maria Antonopoulou, Εleni Εvgenidou, Ioannis Konstantinou, Dimitra Lambropoulou
Cytarabine (CY) is an anticancer drug which has been identified in wastewater influents, effluents, and surface waters. In the present study, the degradation of CY under simulated solar light (SSL), by photo-Fenton (Fe3+ /H2 O2 /SSL) and photo-Fenton-like processes (Fe3+ /S2 O8 2- /SSL and [Fe(C2 O4 )3 ]3- /H2 O2 /SSL), was investigated. The major parameters affecting the applied treatments (e.g., concentration of CY, Fe3+ , H2 O2 , and S2 O8 2- ) were optimized and CY's complete removal was achieved within 45 min for all techniques used...
January 23, 2019: Environmental Science and Pollution Research International
Md Manik Mian, Guijian Liu, Balal Yousaf, Biao Fu, Rafay Ahmed, Qumber Abbas, Mehr Ahmed Mujtaba Munir, Liu Ruijia
A series of new biochar-supported composite based on the combination of biochar and metallic nanoparticles (NPs) were produced through single-step pyrolysis of FeCl3 -Ti(OBu)4 laden agar biomass under NH3 environment. The physiochemical properties of composites were characterized thoroughly. It has found that heating temperature and N-doping through NH3 -ambiance pyrolysis significantly influence the visible-light sensitivity and bandgap energy of composites. The catalytic activities of composites were measured by degradation of Methylene Blue (MB) in the presence or absence of H2 O2 and visible-light irradiation...
April 2019: Journal of Environmental Sciences (China)
Biao-Jun Zhang, Yao-Yun-Chuan Zhao, Qi Fang, Feng-Li Shi, Yue-Chao Zhang, Qun Zhao, Sen-Lin Tian, Ying-Jie Li
Antibiotics are acknowledged micropollutants in wastewaters and surface waters. They are of particular concern because they can trigger an increase in resistant bacteria. Therefore, novel and efficient technology for the removal of antibiotics is urgently needed. In this study, heterogeneous Fenton-like reaction based on ferrocene (Fc) had been constructed, sulfamethazine (SMZ) was selected as target compound due to its abundance in water. The degradation kinetics, transformation pathway, and degradation products of SMZ in this system were investigated...
November 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
Elisabeth Cuervo Lumbaque, Raquel Wielens Becker, Débora Salmoria Araújo, Alexsandro Dallegrave, Tiago Ost Fracari, Vladimir Lavayen, Carla Sirtori
A solar homo/heterogeneous photo-Fenton process using five materials (Fe(II), Fe(III), mining waste, Fe(II)/mining waste, and Fe(III)/mining waste) supported on sodium alginate was used as a strategy to iron dosage for the degradation of eight pharmaceuticals in three different water matrices (distilled water, simulated wastewater, and hospital wastewater). Experiments were carried out in a photoreactor with a capacity of 1 L, using 3 g of iron-alginate spheres and an initial hydrogen peroxide concentration of 25 mg L-1 , at pH 5...
January 9, 2019: Environmental Science and Pollution Research International
Ching-Fang Liu, C P Huang, Chi-Chang Hu, Chihpin Huang
A dual-anode consists of stainless steel and TiO2 /Ti electrodes is used to study the kinetics of the degradation of hazardous chemicals exemplified by azo dye orange G (OG) using a coupling photoelectrochemical catalytic and photoelectro-Fenton (PEC/PEF) system. Concurrent generation of hydroxyl radicals on the TiO2 /Ti photocatalyst and in-situ generation of Fenton reagents on the stainless steel electrode greatly enhances the performance of the PEC/PEF electrodes over that of the PEC and the PEF alone process...
December 20, 2018: Science of the Total Environment
Thi To Nga Phan, Aleksandar N Nikoloski, Parisa Arabzadeh Bahri, Dan Li
LaFeO3 (LFO)-doped acid-modified natural zeolites were prepared by an impregnation-calcination method for the first time. Their effectiveness as photo-Fenton catalysts was evaluated using decolorization of Rhodamine B (RhB) as an organic model. The sample 1HNZ-30LFO was synthesized by using the support of 1HNZ, which was produced via the acid (1 N HCl) treatment of natural zeolite (NZ) at 80 °C for 3 h. It was consisting of approximately 30 wt% LFO and exhibited a higher removal rate of RhB, especially photocatalytic performance, than the pure LFO and parent 1HNZ...
December 25, 2018: Journal of Environmental Management
Andréia Colombo, Aparecido N Módenes, Daniela E G Trigueros, Bruna L de Medeiros, Pricila Marin, Silvia P D Monte Blanco, Camila L Hinterholz
The objective of this study was the toxicity evaluation of landfill leachate samples both raw and after treatment by photo-Fenton (PF), biological (Bio) and photo-Fenton followed by biological (PF-Bio) processes. The organisms Artemia salina and Lactuca sativa were exposed to the leachate in different dilution. In the phytotoxicity evaluation, the inhibition of root (RGI) and radicle (RAGI) growth, and the number of germinated seeds (GR) were evaluated. In the ecotoxicity analysis, the 50% lethal dose (LD50 ) for each type of treatment was evaluated...
December 27, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
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