scholarly journals Application of Magnetic Composites in Removal of Tetracycline through Adsorption and Advanced Oxidation Processes (AOPs): A Review

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1644
Author(s):  
Beibei Fan ◽  
Yi Tan ◽  
Jingxin Wang ◽  
Bangxi Zhang ◽  
Yutao Peng ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Catalytic Performance ◽  
Superior Performance ◽  
Synthesis Methods ◽  
Environmental Persistence ◽  
Magnetic Composites ◽  
Potential Harm ◽  
Oxidation Processes ◽  
Alternative Sources

Water pollution induced by the tetracycline (TC) has caused global increasing attention owing to its extensive use, environmental persistence, and potential harm for human health. Adsorption and advanced oxidation processes (AOPs) have been promising techniques for TC removal due to ideal effectiveness and efficiency. Magnetic composites (MCs) which exploit the combined advantages of nano scale, alternative sources, easy preparation, and separation from wastewater are widely used for catalysis and adsorption. Herein, we intensively reviewed the available literature in order to provide comprehensive insight into the applications and mechanisms of MCs for removal of TC by adsorption and AOPs. The synthesis methods of MCs, the TC adsorption, and removal mechanisms are fully discussed. MCs serve as efficient adsorbents and photocatalysts with superior performance of photocatalytic performance in TC degradation. In addition, the TC can be effectively decomposed by the Fenton-based and SO4•− mediated oxidation under catalysis of the reported MCs with excellent catalytic performance. Based on the existing literature, we further discuss the challenge and future perspectives in MCs-based adsorption and AOPs in removing TC.

scholarly journals The Influence of Photoactive Heterostructures on the Photocatalytic Removal of Dyes and Pharmaceutical Active Compounds: A Mini-Review

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1766
Author(s):  
Alexandru Enesca ◽  
Luminita Andronic
Keyword(s):  
Organic Pollutants ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Pollutant Concentration ◽  
Synthesis Methods ◽  
Promising Candidate ◽  
Traditional Treatment ◽  
Active Compounds ◽  
Oxidation Processes ◽  
Photocatalytic Removal

The diversification of pollutants type and concentration in wastewater has underlined the importance of finding new alternatives to traditional treatment methods. Advanced oxidation processes (AOPs), among others, are considered as promising candidate to efficiently remove organic pollutants such as dyes or pharmaceutical active compounds (PhACs). The present minireview resumes several recent achievements on the implementation and optimization of photoactive heterostructures used as photocatalysts for dyes and PhACs removal. The paper is focused on various methods of enhancing the heterostructure photocatalytic properties by optimizing parameters such as synthesis methods, composition, crystallinity, morphology, pollutant concentration and light irradiation.

scholarly journals Catalytic performance of heteroatom-modified carbon nanotubes in advanced oxidation processes

2014 ◽  
Vol 35 (6) ◽  
pp. 896-905 ◽  
Author(s):  
João Restivo ◽  
Raquel P. Rocha ◽  
Adrián M.T. Silva ◽  
José J.M. Órfão ◽  
Manuel F.R. Pereira ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Catalytic Performance ◽  
Oxidation Processes ◽  
Modified Carbon Nanotubes

FOTODEGRADATION OF LOW MASS MOLECULE PAHS IN FENTON PROCESS

2017 ◽  
Vol 168 (48) ◽  
pp. 25-34 ◽  
Author(s):  
Jolanta Kozak ◽  
Maria Włodarczyk-Makuła
Keyword(s):  
Hydroxyl Radicals ◽  
Advanced Oxidation Processes ◽  
Uv Light ◽  
Advanced Oxidation ◽  
Alternative Source ◽  
Calcium Peroxide ◽  
Oxidation Processes ◽  
Low Mass ◽  
Alternative Sources ◽  
Oxidation Efficiency

Nowadays, the attention of many researchers and scientists is focused on wastewater treatment technologies which are designed to remove toxic and/or persistant compounds. PAHs belong to this type of compounds. Studies have shown that advanced oxidation processes (AOP-advanced oxidation processes) can be used for PAHs degradation. One of the AOP methods is oxidation using Fenton's reagent (Fe2 + / H2O2). The aim of this modification is a search for alternative sources of hydroxyl radicals than H2O2 and support that processes by UV light.. The aim of the study was to determine the efficiency of photocatalysis of low molecular weight PAHs in pretreated coking wastewater under Fenton reaction conditions. The source of hydroxyl radicals was calcium peroxide and the process was supported by UV radiation. The oxidation efficiency was assessed on the basis of PAH analyzes in the pre-and post-oxidation samples. Qualitative and quantitative identification of PAHs was carried out using gas chromatography in combination with GC-MS mass spectrometry. The decrease in the concentration of the analyzed carbohydrates was in the range of 17 to 96%. Studies have shown that calcium peroxide can be an alternative source of hydroxyl radicals for the PAH degradation present in coke wastwater.

Photocatalysis of γ–cyclodextrin-functionalised Fe3O4 nanoparticles for degrading Bisphenol A in polluted waters

2019 ◽  
Vol 16 (2) ◽  
pp. 125 ◽  
Author(s):  
Mariana Neamţu ◽  
Claudia Nădejde ◽  
Vasile-Dan Hodoroabă ◽  
Rudolf J. Schneider ◽  
Gabriel Ababei ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Fe3o4 Nanoparticles ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Superior Performance ◽  
Ultrapure Water ◽  
Wastewater Remediation ◽  
Oxidation Processes ◽  
Real Wastewater ◽  
Bpa Removal

Environmental contextEfficiently removing persistent organic pollutants, such as Bisphenol A, from wastewaters is essential for maintaining environmental quality. The present work applies advanced oxidation processes and the enhanced photocatalytic activity of cyclodextrin-immobilised magnetic nanoparticles for the removal of Bisphenol A under mild conditions. The study highlights the need to consider eco-friendly, safe and cost-effective approaches for the removal of persistent hazardous pollutants from wastewaters. AbstractThe efficiency, relatively low cost and eco-friendly nature of hydrogen peroxide-assisted photocatalysis treatment procedures are significant advantages over conventional techniques for wastewater remediation. Herein, we evaluate the behaviour of γ-cyclodextrin (γ-CD) immobilised on either bare or chitosan (CS)–functionalised Fe3O4 nanoparticles, for photodegrading Bisphenol A (BPA) in ultrapure water and in real wastewater samples. The BPA removal efficiencies with Fe3O4/γ-CD and Fe3O4/CS/γ-CD were compared with those of Fe3O4/β-CD, and were monitored under UVA irradiation at near-neutral pH. The addition of H2O2 at low concentrations (15mmolL−1) significantly increased BPA photodegradation in the presence of each nanocomposite. The highest catalytic activity was shown by both Fe3O4/γ-CD and Fe3O4/CS/γ-CD nanocomposites (~60 and 27% BPA removal in ultrapure water and real wastewater effluent, respectively). Our findings reveal the superior performance of γ-CD-functionalised Fe3O4 relative to that of Fe3O4/β-CD. The use of CD-based nanocomposites as photocatalytic materials could be an attractive option in the pre- or post-treatment stage of wastewaters by advanced oxidation processes before or after biological treatment.

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