Tetracycline Degradation in the UV-heterogeneous Fenton-like System With BiFeO3 Catalyst

Abstract Surplus tetracycline (TC) in the water body causes damage to the ecology balance and human health. Therefore, an efficient strategy was proposed, namely, the UV-heterogeneous Fenton-like system with BiFeO3 (BFO) catalyst, to eliminate TC pollution. This work successfully integrated the photocatalytic oxidation system with the heterogeneous Fenton-like system, cooperating with the photolysis of H2O2. These coupled effects could boost the reduction of Fe (Ⅲ) to Fe (Ⅱ) and depress the recombination of photogenerated charges, further promoting the generation of reactive species, and ultimately facilitating the TC degradation and mineralization. The catalytic of the prepared BFO was stable with no secondary pollution, and BFO could be recovered by an extra magnet to reuse. Compared with other advanced oxidation processes, this system showed an outstanding performance in TC degradation and mineralization, and TC and TOC removal efficiencies could reach 100% and 74.92%, respectively. Moreover, the possible mechanisms for TC degradation involved that TC was degraded by oxidation species generated by the synergistic effect in this system, such as superoxide radicals (·O- 2), hydroxyl radicals (·OH), and positive holes (h+). Intermediate products in the TC degradation process mainly were products at m/z=459, m/z=445, and m/z=134.

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Degradation of the pharmaceuticals lamivudine and zidovudine using advanced oxidation processes

Ciência e Natura ◽

10.5902/2179460x40071 ◽

2020 ◽

Vol 42 ◽

pp. e9

Author(s):

Alex Leandro Andrade de Lucena ◽

Daniella Carla Napoleão ◽

Hélder Vinícius Carneiro da Silva ◽

Rayany Magali da Rocha Santana ◽

Beatriz Galdino Ribeiro ◽

...

Keyword(s):

Lactuca Sativa ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Kinetic Studies ◽

Degradation Process ◽

Oxidation Processes ◽

First Order ◽

Input Variables ◽

Pharmaceutical Degradation ◽

Uv C

The existence of pharmaceuticals in nature is a growing environmental problem, turning necessary the use of efficient treatments for the degradation of these substances, as the advanced oxidation processes (AOPs). In this work the AOPs UV/H2O2 and photo-Fenton were applied to degrade the pharmaceuticals lamivudine and zidovudine in an aqueous solution using a bench reactor, composed of three UV-C lamps. It was verified that the UV/H2O2 process presented a degradation of 97.33 ± 0.14% for lamivudine and 93.90 ± 0.33% for zidovudine, after 180 min of treatment and for an initial concentratin of each pharmaceutical of 5 mg.L-1 and [H2O2] of 600 mg.L-1. A methodology by artificial neural networks (ANNs) was used to model the photocatalytic process, with the MLP 7-23-2 ANN representing it well, and determining the relative importance (%) of each of the input variables for the pharmaceutical’s degradation process. Kinetic studies for the pharmaceutical degradation and the conversion of organic matter showed good adjustments to the pseudo first-order models with R2 raging from 0.9705 to 0.9980. Toxicity assays for the before treatment solution indicated that the seeds Lactuca sativa and Portulaca grandiflora showed growth inhibition whereas the post-treatment solution inhibited only the growth of Lactuca sativa.

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Persulfate Process Activated by Homogeneous and Heterogeneous Catalysts for Synthetic Olive Mill Wastewater Treatment

Water ◽

10.3390/w13213010 ◽

2021 ◽

Vol 13 (21) ◽

pp. 3010

Author(s):

Eva Domingues ◽

Maria João Silva ◽

Telma Vaz ◽

João Gomes ◽

Rui C. Martins

Keyword(s):

Phenolic Compounds ◽

Red Mud ◽

Advanced Oxidation Processes ◽

Heterogeneous Catalysts ◽

Advanced Oxidation ◽

Iron Sulfate ◽

Toxicity Tests ◽

Oxidation Processes ◽

Toc Removal ◽

Olive Mill

Wastewaters from the olive oil industry are a regional environmental problem. Their phenolic content provides inherent toxicity, which reduces the treatment potential of conventional biological systems. In this study, Sulfate Radical based Advanced Oxidation Processes (SRbAOPs) are compared with advanced oxidation processes (namely Fenton’s peroxidation) as a depuration alternative. Synthetic olive mill wastewaters were submitted to homogeneous and heterogeneous SRbAOPs using iron sulfate and solid catalysts (red mud and Fe-Ce-O) as the source of iron (II). The homogenous process was optimized by testing different pH values, as well as iron and persulfate loads. At the best conditions (pH 5, 300 mg/L of iron and 600 mg/L of persulfate), it was possible to achieve 39%, 63% and 37% COD, phenolic compounds and TOC removal, respectively. The catalytic potential of a waste (red mud) and a laboratory material (Fe-Ce-O) was tested using heterogenous SRbAOPs. The best performance was achieved by Fe-Ce-O, with an optimal load of 1600 mg/L. At these conditions, 27%, 55% and 5% COD, phenolic compounds and TOC removal were obtained, respectively. Toxicity tests on A. fischeri and L. sativum showed no improvements in toxicity from the treated solutions when compared with the original one. Thus, SRbAOPs use a suitable technology for synthetic OMW.

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Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes

Water ◽

10.3390/w12102811 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2811

Author(s):

Dheaya Alrousan ◽

Arsalan Afkhami ◽

Khalid Bani-Melhem ◽

Patrick Dunlop

Keyword(s):

Advanced Oxidation Processes ◽

Low Cost ◽

Advanced Oxidation ◽

Molar Ratio ◽

Organic Fraction ◽

Viable Option ◽

Oxidation Processes ◽

Toc Removal ◽

Uva Irradiation ◽

Efficiency Parameter

In keeping with the circular economy approach, reclaiming greywater (GW) is considered a sustainable approach to local reuse of wastewater and a viable option to reduce household demand for freshwater. This study investigated the mineralization of total organic carbon (TOC) in GW using TiO2-based advanced oxidation processes (AOPs) in a custom-built stirred tank reactor. The combinations of H2O2, O3, and immobilized TiO2 under either dark or UVA irradiation conditions were systematically evaluated—namely TiO2/dark, O3/dark (ozonation), H2O2/dark (peroxidation), TiO2/UVA (photocatalysis), O3/UVA (Ozone photolysis), H2O2/UVA (photo-peroxidation), O3/TiO2/dark (catalytic ozonation), O3/TiO2/UVA (photocatalytic ozonation), H2O2/TiO2/dark, H2O2/TiO2/UVA, H2O2/O3/dark (peroxonation), H2O2/O3/UVA (photo-peroxonation), H2O2/O3/TiO2/dark (catalytic peroxonation), and H2O2/O3/TiO2/UVA (photocatalytic peroxonation). It was found that combining different treatment methods with UVA irradiation dramatically enhanced the organic mineralization efficiency. The optimum TiO2 loading in this study was observed to be 0.96 mg/cm2 with the highest TOC removal (54%) achieved using photocatalytic peroxonation under optimal conditions (0.96 mg TiO2/cm2, 25 mg O3/min, and 0.7 H2O2/O3 molar ratio). In peroxonation and photo-peroxonation, the optimal H2O2/O3 molar ratio was identified to be a critical efficiency parameter maximizing the production of reactive radical species. Increasing ozone flow rate or H2O2 dosage was observed to cause an efficiency inhibition effect. This lab-based study demonstrates the potential for combined TiO2-AOP treatments to significantly reduce the organic fraction of real GW, offering potential for the development of low-cost systems permitting safe GW reuse.

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Discoloration and mineralization of a textile azo dye using a hybrid UV/O3/SBR process

Applied Water Science ◽

10.1007/s13201-021-01479-1 ◽

2021 ◽

Vol 11 (10) ◽

Author(s):

Hakimeh Mahdizadeh ◽

Yousef Dadban Shahamat ◽

Susana Rodríguez-Couto

Keyword(s):

Textile Industry ◽

Advanced Oxidation Processes ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Synthetic Dyes ◽

Oxidation Processes ◽

Toc Removal ◽

Reactive Red 198 ◽

Water And Wastewater ◽

Ozonation Process

AbstractMost synthetic dyes are toxic and hardly biodegradable compounds that enter the environment mainly through the discharged of non-treated textile industry effluents. The present study investigated the removal of the textile monoazo dye Reactive Red 198 (RR-198) from aqueous solutions using the ultraviolet light and ozonation alone and in combination (i.e., UV/O3) followed by a Sequencing Batch Reactor (SBR). The pH (5 ≤ pH ≤ 9) and dye initial concentration (50–300 mg/L) parameters were optimized in the ozonation process at reaction time of 0–60 min. Then, TOC removal and dye discoloration percentage was compared with the O3, UV and O3/UV processes. In order to compare the performance of the SBR in dye discoloration of RR-198 and TOC removal, four types of effluent, including Raw dye, O3-pretreated dye, UV-treated dye and UV/O3-pretreated dye were separately treated in the SBR system. In the ozonation process, by increasing the pH and reducing the initial dye concentration increased the discoloration percentage. The highest dye discoloration percentage and TOC removal obtained in the hybrid UV/O3/SBR process. Combining biological systems and Advanced Oxidation Processes is an appropriate option for the decomposition of resistant pollutants and increasing the biodegradability of these compounds and is applicable in the water and wastewater industry.

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Removal of Emerging Contaminants in Wastewater by Sonolysis, Photocatalysis and Ozonation

Global NEST Journal ◽

10.30955/gnj.002625 ◽

2018 ◽

Vol 21 (2) ◽

pp. 98-105 ◽

Cited By ~ 1

Keyword(s):

Rate Constants ◽

Photocatalytic Oxidation ◽

Advanced Oxidation Processes ◽

Emerging Contaminants ◽

Removal Rate ◽

Experimental Conditions ◽

Oxidation Processes ◽

First Order ◽

Performance Variation ◽

Pseudo First Order

<p>Three different advanced oxidation processes (AOPs) were applied to investigate the removal of emerging contaminants (ECs) i.e. sulfamethoxazole (SMX), diclofenac (DCF) and carbamazepine (CBZ) in synthetically prepared solutions. The degradation of these substances was carried out by ozonation, sonolysis and photocatalytic oxidation, as well as by different combinations of these processes. The objectives of this work were to evaluate the removal efficiency in each AOP and to assess the performance variation of sonolysis in combination with other AOPs. The best performances were achieved by sonocatalysis, which resulted in the removal of the selected pharmaceuticals in the range between 37% and 47%. Under similar experimental conditions, the removal of the selected ECs by single compounds by ozonation was slightly lower than the removal of respective compounds in the mixture. Moreover, pseudo first-order removal rate constants of photocatalytic mineralization were determined as 9.33×10-2, 4.90×10-3, 1.06×10-2 min-1 for SMX, DCF and CBZ, respectively.</p>

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Degradation of PVA (polyvinyl alcohol) in wastewater by advanced oxidation processes

Journal of Advanced Oxidation Technologies ◽

10.1515/jaots-2017-0018 ◽

2017 ◽

Vol 20 (2) ◽

Cited By ~ 1

Author(s):

Weihua Sun ◽

Lujun Chen ◽

Jianlong Wang

Keyword(s):

Polyvinyl Alcohol ◽

Photocatalytic Oxidation ◽

Advanced Oxidation Processes ◽

Organic Pollutant ◽

Advanced Oxidation ◽

Air Oxidation ◽

Paper Mills ◽

Persulfate Oxidation ◽

Oxidation Processes ◽

Biological Methods

AbstractAdvanced oxidation processes (AOPs) constitute a promising technology to treat wastewater containing organic pollutants that are not easily biodegradable. They have received increasing attention in the research and development of wastewater treatment technologies in recent decades for their removal or degradation of recalcitrant pollutants or as pretreatments to convert pollutants into smaller compounds, which can be treated using conventional biological methods. Polyvinyl alcohol (PVA) is a typical refractory organic pollutant. It has received special attention due to its low biodegradability and the large amount of PVA-containing wastewater discharged from textile and paper mills. This review focuses on PVA removal and PVA wastewater pretreatment by AOPs, which include ozonation, Fenton oxidation, persulfate oxidation, ultrasound cavitation, ionizing radiation, photocatalytic oxidation, wet air oxidation and electrochemical oxidation. The mechanistic degradation pathways of PVA by AOPs are also discussed. In addition, a new classification of AOPs is applied for PVA treatment.

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Efficiency of advanced oxidation processes in lowering bisphenol A toxicity and oestrogenic activity in aqueous samples

Archives of Industrial Hygiene and Toxicology ◽

10.2478/10004-1254-65-2014-2415 ◽

2014 ◽

Vol 65 (1) ◽

pp. 77-87 ◽

Cited By ~ 7

Author(s):

Maja Plahuta ◽

Tatjana Tišler ◽

Mihael Jožef Toman ◽

Albin Pintar

Keyword(s):

Chemical Analysis ◽

Bisphenol A ◽

Photocatalytic Oxidation ◽

Advanced Oxidation Processes ◽

Vibrio Fischeri ◽

Advanced Oxidation ◽

Aqueous Samples ◽

Yeast Saccharomyces Cerevisiae ◽

Oxidation Processes ◽

Set Up

Summary Bisphenol A (BPA) is a well-known endocrine disruptor with adverse oestrogen-like effects eliciting adverse effects in humans and wildlife. For this reason it is necessary to set up an efficient removal of BPA from wastewaters, before they are discharged into surface waters. The aim of this study was to compare the efficiency of BPA removal from aqueous samples with photolytic, photocatalytic, and UV/H2O2 oxidation. BPA solutions were illuminated with different bulbs (halogen; 17 W UV, 254 nm; and 150 W UV, 365 nm) with or without the TiO2 P-25 catalyst or H2O2 (to accelerate degradation). Acute toxicity and oestrogenic activity of treated samples were determined using luminescent bacteria (Vibrio fischeri), water fleas (Daphnia magna), zebrafish embryos (Danio rerio), and Yeast Estrogen Screen (YES) assay with genetically modified yeast Saccharomyces cerevisiae. The results confirmed that BPA is toxic and oestrogenically active. Chemical analysis showed a reduction of BPA levels after photolytic treatment and 100 % conversion of BPA by photocatalytic and UV/H2O2 oxidation. The toxicity and oestrogenic activity of BPA were largely reduced in photolytically treated samples. Photocatalytic oxidation, however, either did not reduce BPA toxic and oestrogenic effects or even increased them in comparison with the baseline, untreated BPA solution. Our findings suggest that chemical analysis is not sufficient to determine the efficiency of advanced oxidation processes in removing pollutants from water and needs to be complemented with biological tests.

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Photocatalysis for the Degradation of Ionic Surfactants in Water: The Case of DPC

MRS Proceedings ◽

10.1557/proc-1171-s07-19 ◽

2009 ◽

Vol 1171 ◽

Cited By ~ 1

Author(s):

Alberto Naldoni ◽

Claudia Bianchi ◽

Silvia Ardizzone ◽

Giuseppe Cappelletti ◽

Luca Ciceri ◽

...

Keyword(s):

Wastewater Treatment ◽

Biological Activity ◽

Advanced Oxidation Processes ◽

Degradation Process ◽

Aluminum Surface ◽

Ionic Surfactants ◽

Oxidation Processes ◽

Carbon Adsorption ◽

Dodecylpyridinium Chloride ◽

Alternative Processes

AbstractTraditional techniques to remove contaminants (carbon adsorption, incineration, biological activity and chemical treatment) have a lot of disadvantages. Advanced Oxidation Processes (AOP’s) are used as alternative processes in the degradation of surfactants and in general for wastewater treatment. They are based on the generation of OH•, one of the most powerful oxidant known (E° = 2.73 V) and capable to react non-selectively with any organic compound. In the present work, the degradation of a cationic surfactant (dodecylpyridinium chloride (DPC)) was performed. The photodegradation reaction was investigated both in a slurry reactor and in a vessel where the photocatalyst (P25 by Degussa) was anchored onto an aluminum surface to avoid the final filtration of the powder at the end of the reaction. Moreover a new photoreactor was built on purpose to investigate the influence of the pressure on the degradation process.

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Kinetics and Mechanistic Studies of Photochemical and Oxidative Stability of Galaxolide

Water ◽

10.3390/w13131813 ◽

2021 ◽

Vol 13 (13) ◽

pp. 1813

Author(s):

Aneta Sokol ◽

Artur Ratkiewicz ◽

Iwona Tomaszewska ◽

Joanna Karpinska

Keyword(s):

Advanced Oxidation Processes ◽

Degradation Products ◽

Advanced Oxidation ◽

Degradation Process ◽

Oh Radicals ◽

Direct Photolysis ◽

Oxidation Processes ◽

First Order Kinetics ◽

Kinetics Of ◽

Oxidative Agents

Studies on kinetics of galaxolide (HHCB) degradation under influence of UV, simulated sunlight and some advanced oxidation processes (H2O2, UV/H2O2, and Vis/H2O2) were conducted. Galaxolide appeared to be a photolabile compound. The first-order kinetics model was assumed for all studied processes. It was observed that basic pH favored HHCB degradation. The influence of natural matrices (river water and artificial sweat) on direct photolysis of HHCB was examined. It was stated that the process of the photodegradation proceeded slower at the presence of each matrix. HHCB lactone was identified using the GC-MS technique. The recorded chromatograms showed that apart from the lactone, other degradation products were formed that we could not identify. In order to deeper understand the HHCB degradation process, DFT calculations were performed. The results pointed out that OH radicals play a key role in HHCB decomposition, which mainly proceeds via H abstractions as well as OH additions. It follows from the calculations that the visible light is sufficient to initiate the advanced oxidation processes (AOPs) under the oxidative conditions, whereas UV irradiation is needed to start decay with no oxidative agents.

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Perovskites as Catalysts in Advanced Oxidation Processes for Wastewater Treatment

Catalysts ◽

10.3390/catal9030230 ◽

2019 ◽

Vol 9 (3) ◽

pp. 230 ◽

Cited By ~ 10

Author(s):

María Rojas-Cervantes ◽

Eva Castillejos

Keyword(s):

Organic Contaminants ◽

Photocatalytic Oxidation ◽

Advanced Oxidation Processes ◽

High Mobility ◽

Advanced Oxidation ◽

Oxidation States ◽

Effluent Water ◽

Oxidation Processes ◽

Reactive Radicals ◽

Perovskite Type

Advanced oxidation processes (AOPs), based on the formation of highly reactive radicals are able to degrade many organic contaminants present in effluent water. In the heterogeneous AOPS the presence of a solid which acts as catalyst in combination with other systems (O3, H2O2, light) is required. Among the different materials that can catalyse these processes, perovskites are found to be very promising, because they are highly stable and exhibit a high mobility of network oxygen with the possibility of forming vacancies and to stabilize unusual oxidation states of metals. In this review, we show the fundaments of different kinds of AOPs and the application of perovskite type oxides in them, classified attending to the oxidant used, ozone, H2O2 or peroxymonosulfate, alone or in combination with other systems. The photocatalytic oxidation, consisting in the activation of the perovskite by irradiation with ultraviolet or visible light is also revised.

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