Different approaches for the solar photocatalytic removal of micro-contaminants from aqueous environment: Titania vs. hybrid magnetic iron oxides

Polliotto, Valeria; Pomilla, Francesca Rita; Maurino, Valter; Marcı̀, Giuseppe; Prevot, Alessandra Bianco; Nisticò, Roberto; Magnacca, Giuliana; Paganini, Maria Cristina; Ponce-Robles, L.; Pérez, Luis Alejandro Macclesh del Pino; Malato, S.

doi:10.1016/j.cattod.2019.01.044

Cited by 22 publications

(10 citation statements)

References 32 publications

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“…In the homogeneous phase, BBS (dissolved in water) have been proven to be efficient in the removal of naphtalensuphonates, azo-dyes and monochlorophenols, with good abatement results, as well as in terms of residual toxicity (the BBS themselves can be considered not toxic before and after irradiation) [ 60 ]. Heterogenized (supported) BBS, as the magnetic hybrids described above, have been also employed to photodegrade differently charged dyes [ 76 ], phenols [ 77 , 78 ], caffeine [ 37 , 61 ], carbamazepine [ 79 ], diclofenac [ 80 ] and other contaminants of emerging concern [ 81 ]. It is worth recalling that the heterogenization allows for the recovery and reuse of the active material, improving the sustainability of the whole process.…”

Section: Discussion: Chemical and Physical Phenomena Occurring During The Experiment: Analytical Inorganic Physical Chemistry For Dummiesmentioning

confidence: 99%

The “Lab4treat” Outreach Experience: Preparation of Sustainable Magnetic Nanomaterials for Remediation of Model Wastewater

et al. 2021

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The Lab4treat experience has been developed to demonstrate the use of magnetic materials in environmental applications. It was projected in the frame of the European project Mat4Treat, and it was tested several times in front of different audiences ranging from school students to the general public in training and/or divulgation events. The experience lends itself to discuss several aspects of actuality, physics and chemistry, which can be explained by modulating the discussion depth level, in order to meet the interests of younger or more experienced people and expand their knowledge. The topic is relevant, dealing with the recycling of urban waste and water depollution. The paper is placed within the field of water treatment for contaminant removal; therefore, a rich collection of recent (and less recent) papers dealing with magnetic materials and environmental issues is described in the Introduction section. In addition, the paper contains a detailed description of the experiment and a list of the possible topics which can be developed during the activity. The experimental approach makes the comprehension of scientific phenomena effective, and, from this perspective, the paper can be considered to be an example of interactive teaching.

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Section: Discussion: Chemical and Physical Phenomena Occurring During The Experiment: Analytical Inorganic Physical Chemistry For Dummiesmentioning

confidence: 99%

The “Lab4treat” Outreach Experience: Preparation of Sustainable Magnetic Nanomaterials for Remediation of Model Wastewater

et al. 2021

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“…We have shown that suspensions of humic acid (HA)-coated Fe 3 O 4 nanoparticles are able to generate reactive oxygen species (ROS) upon irradiation with UV-visible light, and hence these materials are potential candidates for treating contaminants susceptible to HA-photosensitized degradation [20]. On the other hand, magnetite nanoparticles coated with humic acid-like biopolymers derived from composted urban biowaste were successfully employed as iron sources in the Fenton-like and photo-Fenton-like processes for the degradation of emerging contaminants at circumneutral pH [21,22]. However, the role of the organic coating of the nanoparticles in the photo-Fenton process is still not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Carbamazepine Degradation Mediated by Light in the Presence of Humic Substances-Coated Magnetite Nanoparticles

et al. 2019

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The use of iron-based nanomaterials for environmental remediation processes has recently received considerable attention. Here, we employed core-shell magnetite-humic acids nanoparticles as a heterogeneous photosensitizer and iron source in photo-Fenton reaction for the degradation of the psychiatric drug carbamazepine (CBZ). CBZ showed low photodegradation rates in the presence of the magnetic nanoparticles, whereas the addition of hydrogen peroxide at pH = 3 to the system drastically increased the abatement of the contaminant. The measured Fe2+ and Fe3+ profiles point to the generation of Fe3+ at the surface of the nanoparticles, indicating a heterogeneous oxidation of the contaminant mediated by hydroxyl radicals. Products with a higher transformation degree were observed in the photo-Fenton procedure and support the attack of the HO• radical on the CBZ molecule. Promising results encourage the use of the nanoparticles as efficient iron sources with enhanced magnet-sensitive properties, suitable for applications in photo-Fenton treatments for the purification of wastewater.

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“…In this context, the addition of HLSs has two main advantages: (1) grafting HLSs on the surface of magnetic materials favors the heterogeneous photo-Fenton process, most probably by complexing iron or adsorbing the pollutants, and (2) they offer a protective coating preventing surface oxidation and thus the loss of magnetism . In recent years, literature is available describing the preparation and use of HLS–magnetic hybrid materials for the removal of organic pollutants. − For example, an increase in the absorption capacity of magnetite nanoparticles coated with HLSs with the increase of particle concentration and pH value was observed for crystal violet as a model compound . Among the pollutants that have been removed by an HLS–magnetite-driven heterogeneous photo-Fenton reaction can be found caffeine, , carbamazepine, 4-chlorophenol, or bisphenol A .…”

Section: Heterogeneous Hybrid Hls Materials For Pollutant Eliminationmentioning

confidence: 99%

Humic-Like Substances as Auxiliaries to Enhance Advanced Oxidation Processes

et al. 2022

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The application of humic-like substances (HLSs) in advanced oxidation processes for wastewater treatment is summarized in this work. HLSs share important characteristics with humic substances, and they can be isolated from different wastes using procedures that are related with their pH-dependent solubility. They are able to generate, upon irradiation, reactive species such as hydroxyl radicals and singlet oxygen or triplet excited states. Although photochemical removal of pollutants can be reached by HLSs, in general, irradiation times are very long. HLSs are good metal-complexing agents, and the Fe−HLS complex is able to participate in (photo)-Fenton-like processes at mild pH, preventing iron deactivation. Finally, novel hybrid materials with environmental applications have been synthesized using HLSs; in some cases, they also contain iron oxides, which allow a better separation but also the ability to drive heterogeneous (photo)-Fenton processes.

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Different approaches for the solar photocatalytic removal of micro-contaminants from aqueous environment: Titania vs. hybrid magnetic iron oxides

Cited by 22 publications

References 32 publications

The “Lab4treat” Outreach Experience: Preparation of Sustainable Magnetic Nanomaterials for Remediation of Model Wastewater

The “Lab4treat” Outreach Experience: Preparation of Sustainable Magnetic Nanomaterials for Remediation of Model Wastewater

Carbamazepine Degradation Mediated by Light in the Presence of Humic Substances-Coated Magnetite Nanoparticles

Humic-Like Substances as Auxiliaries to Enhance Advanced Oxidation Processes

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