Next Article in Journal
Efficient Utilization of Hydrocarbon Mixture to Produce Aromatics over Zn/ZSM-5 and Physically Mixed with ZSM-5
Previous Article in Journal
Establishment of Integrated Analysis Method for Probing and Reconstructing Hydrogenation Mechanism of a Model Reaction
Previous Article in Special Issue
Heteroatom (N, S) Co-Doped CNTs in the Phenol Oxidation by Catalytic Wet Air Oxidation
 
 
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:
Background:
Editorial

Novel Heterogeneous Catalysts for Advanced Oxidation Processes (AOPs)

by
Olívia Salomé G. P. Soares
1,2,*,
Carla A. Orge
1,2 and
Raquel Pinto Rocha
1,2
1
Laboratory of Separation and Reaction Engineering—Laboratory of Catalysis and Materials, (LSRE-LCM), Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
2
ALiCE—Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
*
Author to whom correspondence should be addressed.
Catalysts 2022, 12(5), 498; https://doi.org/10.3390/catal12050498
Submission received: 21 April 2022 / Revised: 26 April 2022 / Accepted: 27 April 2022 / Published: 29 April 2022
(This article belongs to the Special Issue Novel Heterogeneous Catalysts for Advanced Oxidation Processes (AOPs))
With the increasing global usage of water and the continuous addition of contaminants to water sources, new challenges associated with the abatement of organic pollutants, particularly those that are refractory to conventional water and wastewater treatment technologies, have arisen. Advanced oxidation processes (AOPs) present a competitive alternative to promote the oxidation of organic contaminants by strong oxidative radicals generated from oxygen, ozone, wet peroxide, UV radiation. In addition, the use of catalysts not only improves efficiency, but may present remarkable cost advantages for practical applications of AOPs in the abatement of several pollutants.
Rocha et al. prepared N, S-co-doping of commercial carbon nanotubes (CNTs) by a solvent-free mechanothermal approach using thiourea [1]. Although the samples revealed a similar performance for phenol degradation by catalytic wet air oxidation, a higher total organic carbon removal was observed using the sample thermally treated at 900 °C, which was attributed to the presence of N6, NQ, and thiophenic groups. Martín-Somer et al. evaluated the activity of P25 TiO2 particles, coated with SiO2, using atomic layer deposition (ALD) during methylene blue removal by photocatalysis, oxidation of methanol and inactivation of Escherichia coli bacteria in water and compared with bare P25 [2]. A significant improvement in the removal of methylene blue is achieved, due to an increase in its adsorption. Sharif and Roberts successfully synthesized and characterized electrically conducting nanocomposites, including graphene/SnO2 and graphene/Sb-SnO2 [3]. The adsorption capacity of the new composites was ≥40% higher than bare graphene and were effectively regenerated in both NaCl and Na2SO4 electrolytes, attaining high regeneration efficiencies and no loss of the nanocomposite. A detailed study about the environmental impacts associated with the production of different magnetic nanoparticles (NPs) based on magnetite (Fe3O4), with a potential use as heterogeneous Fenton or photo-Fenton catalysts in wastewater treatment applications was presented by Feijoo et al. [4]. The results suggest that magnetic nanoparticles coated with stabilizing agents as poly(acrylic acid) (PAA) and polyethylenimine (PEI) were the most suitable option for their applications in heterogeneous Fenton processes, whereas ZnO-Fe3O4 NPs provided an interesting approach in photo-Fenton. Wang et al. verified that prepared novel biochar-supported composite containing both iron sulfide and iron oxide enhanced the catalytic degradation of ciprofloxacin through Fenton-type reactions, due to increase production of ·OH radicals [5]. Santos Silva et al. using clay-based materials in the catalytic wet peroxide oxidation during paracetamol (PCM) degradation and a high stability was observed due to lower leaching verified at the end of the reaction [6]. Orge et al. studied the presence of magnetic nanoparticles (MNP) composed of iron oxide coated with carbon in the photocatalytic ozonation and verified that the carbon phase is directly related to high catalytic activity [7]. Activated carbon (AC), carbon xerogel (XG), and carbon nanotubes (CNT), with and without N-functionalities, impregnated with iron were evaluated during adsorption, catalytic wet peroxidation (CWPO), and Fenton process during p-nitrophenol (PNP) degradation by Soares et al. [8]. The presence of N-functionalities increases such removals and the removal increase with the increase in the nitrogen content. Li et al. developed high-efficiency and stable visible-light-driven (VLD) photocatalysts and verified that the introduction of CdS in Bi2MoO6 enhance the light absorption ability and dramatically boost the separation of charge carriers, leading to excellent performance during toxic antibiotics removal [9].
Summarizing, the present Special Issue reported a detailed preparation of a series of novel catalysts highly efficient in degradation of several pollutants by different AOPs (photocatalysis, catalytic wet air/peroxide oxidation, Fenton based processes, photocatalytic ozonation).

Author Contributions

Conceptualization, O.S.G.P.S., C.A.O., R.P.R. writing—original draft preparation, C.A.O.; writing—review and editing, O.S.G.P.S., C.A.O.; funding acquisition, O.S.G.P.S., C.A.O. All authors have read and agreed to the published version of the manuscript.

Funding

This research was financially supported by InTreat-PTDC/EAM-AMB/31337/2017-POCI-01-0145-FEDER-031337-funded by FEDER funds through COMPETE2020-Programa Operacional Competitividade e Internacionalização (POCI) and by national funds (PIDDAC) through FCT/MCTES and by NORTE-01-0247-FEDER-069836, co-financed by the European Regional Development Fund (ERDF), through the North Portugal Regional Operational Programme (NORTE2020), under the PORTUGAL 2020 Partnership Agreement; LA/P/0045/2020 (ALiCE), UIDB/50020/2020 and UIDP/50020/2020 (LSRE-LCM), funded by national funds through FCT/MCTES (PIDDAC). C.A.O. acknowledges FCT funding under DL57/2016 Transitory Norm Programme. O.S.G.P.S. acknowledges FCT funding under the Scientific Employment Stimulus-Institutional Call CEECINST/00049/2018.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Rocha, R.; Soares, O.; Órfão, J.; Pereira, M.; Figueiredo, J. Heteroatom (N, S) Co-Doped CNTs in the Phenol Oxidation by Catalytic Wet Air Oxidation. Catalysts 2021, 11, 578. [Google Scholar] [CrossRef]
  2. Martín-Sómer, M.; Benz, D.; van Ommen, J.; Marugán, J. Multitarget Evaluation of the Photocatalytic Activity of P25-SiO2 Prepared by Atomic Layer Deposition. Catalysts 2020, 10, 450. [Google Scholar] [CrossRef]
  3. Sharif, F.; Roberts, E. Electrochemical Oxidation of an Organic Dye Adsorbed on Tin Oxide and Antimony Doped Tin Oxide Graphene Composites. Catalysts 2020, 10, 263. [Google Scholar] [CrossRef] [Green Version]
  4. Feijoo, S.; González-Rodríguez, J.; Fernández, L.; Vázquez-Vázquez, C.; Feijoo, G.; Moreira, M. Fenton and Photo-Fenton Nanocatalysts Revisited from the Perspective of Life Cycle Assessment. Catalysts 2020, 10, 23. [Google Scholar] [CrossRef] [Green Version]
  5. Wang, Y.; Zhu, X.; Feng, D.; Hodge, A.; Hu, L.; Lü, J.; Li, J. Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin. Catalysts 2019, 9, 1062. [Google Scholar] [CrossRef] [Green Version]
  6. Santos Silva, A.; Seitovna Kalmakhanova, M.; Kabykenovna Massalimova, B.G.; Sgorlon, J.; Jose Luis, D.T.; Gomes, H. Wet Peroxide Oxidation of Paracetamol Using Acid Activated and Fe/Co-Pillared Clay Catalysts Prepared from Natural Clays. Catalysts 2019, 9, 705. [Google Scholar] [CrossRef] [Green Version]
  7. Orge, C.; Soares, O.; Ramalho, P.; Pereira, M.; Faria, J. Magnetic Nanoparticles for Photocatalytic Ozonation of Organic Pollutants. Catalysts 2019, 9, 703. [Google Scholar] [CrossRef] [Green Version]
  8. Soares, O.; Rodrigues, C.; Madeira, L.; Pereira, M. Heterogeneous Fenton-Like Degradation of p-Nitrophenol over Tailored Carbon-Based Materials. Catalysts 2019, 9, 258. [Google Scholar] [CrossRef] [Green Version]
  9. Li, S.; Liu, Y.; Long, Y.; Mo, L.; Zhang, H.; Liu, J. Facile Synthesis of Bi2MoO6 Microspheres Decorated by CdS Nanoparticles with Efficient Photocatalytic Removal of Levfloxacin Antibiotic. Catalysts 2018, 8, 477. [Google Scholar] [CrossRef] [Green Version]
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Soares, O.S.G.P.; Orge, C.A.; Rocha, R.P. Novel Heterogeneous Catalysts for Advanced Oxidation Processes (AOPs). Catalysts 2022, 12, 498. https://doi.org/10.3390/catal12050498

AMA Style

Soares OSGP, Orge CA, Rocha RP. Novel Heterogeneous Catalysts for Advanced Oxidation Processes (AOPs). Catalysts. 2022; 12(5):498. https://doi.org/10.3390/catal12050498

Chicago/Turabian Style

Soares, Olívia Salomé G. P., Carla A. Orge, and Raquel Pinto Rocha. 2022. "Novel Heterogeneous Catalysts for Advanced Oxidation Processes (AOPs)" Catalysts 12, no. 5: 498. https://doi.org/10.3390/catal12050498

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

Article Metrics

Back to TopTop