UV and solar-based photocatalytic degradation of organic pollutants by nano-sized TiO2 grown on carbon nanotubes

Murgolo, Sapia; Petronella, Francesca; Ciannarella, Ruggiero; Comparelli, Roberto; Agostiano, Angela; Curri, Maria Lucia; Mascolo, G.

doi:10.1016/j.cattod.2014.04.021

Cited by 129 publications

(58 citation statements)

References 37 publications

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“…material with a strong adherence to the catalyst, a high specific surface area, inertness with respect to the photocatalyst, but with a fair adsorption affinity towards the contaminants [54]. For example, Murgolo et al show a good efficiency of nanometric TiO 2 supported on single walled carbon nanotubes during the degradation of a mixture of 22 PPCPs either in pure water or in secondary wastewater effluent [55]. Very recently, Karaolia et al have synthesized graphene-based TiO 2 composite photocatalysts to remove antibiotics and antibiotic-resistant bacteria, such as sulfamethoxazole, erythromycin and clarithromycin, in urban wastewater.…”

Section: Photocatalysis and Other Advanced Oxidation Processesmentioning

confidence: 99%

Nanomaterials for the Abatement of Pharmaceuticals and Personal Care Products from Wastewater

2018

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Abstract:In this short-review, the most common types of both pharmaceutical and personal care products (PPCP, a class of "emerging pollutants") are considered, as well as some of the most frequent methods for their removal that envisage the use of nanomaterials. The nanomaterials used in conservative methods (namely, reverse osmosis, nanofiltration and adsorption) are basically nanoporous solids. Non-conservative methods, which include photocatalysis and Fenton reaction, are currently considered more promising than conservative ones, as the former allow the (at least) partial degradation of the original molecules into more biodegradable by-products, which can be further abated by subsequent biological treatments, whereas the former are not efficient for the removal of small quantities of pollutants and have to be regenerated.

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Section: Photocatalysis and Other Advanced Oxidation Processesmentioning

confidence: 99%

Nanomaterials for the Abatement of Pharmaceuticals and Personal Care Products from Wastewater

2018

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“…They have applications in Ti-implants to avoid post-operation infections [11][12][13]. The discoloration of the textile dye methyl red under UVlight and the degradation of pollutants by Ag-TiO 2 nanotubes has been recently reported [14,15]. Ag-TiO 2 was observed to accelerate bacterial inactivation when compared with bare TiO 2 under band-gap irradiation [16,17].…”

Section: Introductionmentioning

confidence: 98%

FeOx magnetization enhancing E. coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

Mangayayam

Kiwi

Giannakis

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tDrastic bacterial enhancement was observed when the Ag(3%)-TiO 2 nanotubes were modified with FeOx (3%) magnetic oxide. On bare TiO 2 -nanotubes a reduction of 0.2log 10 CFU was observed within one hour under simulated low intensity solar light. Under similar conditions, a bacterial reduction of 2.5log 10 CFU was observed on Ag(3%)TiO 2 increasing to 6.0log 10 CFU on Ag(3%)-TiO 2 -FeOx(3%) magnetic nanotubes. The bacterial inactivation kinetics is strongly influenced by the addition of FeOx. The fast inactivation induced by the composite catalyst seems to involve an increase in the interfacial charge transfer (IFCT) compared to a 2-oxide composite photocatalyst. Stable recycling of the photocatalyst was observed leading to bacterial oxidation. The unambiguous identification of the radical intermediates: OH-radicals, O-singlet and the valence holes vb(h + ) on the Ag-TiO 2 -FeOx interface showed that the valence band holes vb(h + ) were the main oxidative intermediates leading to bacterial inactivation. Nanotubes size, crystallinity and bulk composition of magnetite 1% ( = 51.0• ), anatase 5% ( = 8.9• ), goethite 37.3% ( = 9.0 • ), silver 1% ( = 2.7• ) was obtained by the Rietveld refinement for the Ag(3%)-TiO 2 -FeOx(3%) nanotubes. The redox chemistry during bacterial inactivation was determined by X-ray photoelectron spectroscopy (XPS).

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“…The photocatalytic processes have the potential to mineralize complicated organics and reduce toxicity without the generation of sludge and by-products (Li et al 2012b;Saleh and Gupta 2012b). Titanium dioxide (TiO 2 ) is the most common and practical material as the environmental photocatalyst (Murgolo et al 2015;Barakat 2011;Saif et al 2013;ELMekkawi and Galal 2013;Saleh and Gupta 2012b;Gupta et al 2012). Different features of TiO 2 photocatalysts have an influence on the photocatalytic performance, such as particle size, crystalline structure, phase composition, BET surface area and surface hydroxyl groups (Tryba et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…For example, the UV/visible spectrophotometry was often used to follow up the color change in degraded pollutants. Further, chromatography analyses were used to investigate the disappearance of reactants and/or the formation of new products (Sabin et al 1992;Theurich et al 1996;Ryu and Choi 2008;Murgolo et al 2015). These wide variations in the used techniques lead to inaccurate assessments of different TiO 2 photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity evaluation of TiO2 nanoparticles based on COD analyses for water treatment applications: a standardization attempt

EL-Mekkawi

Galal

Wahab

et al. 2016

Int. J. Environ. Sci. Technol.

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Evaluation of the photocatalytic activities of TiO 2 nanomaterials based on the chemical oxygen demand (COD) analyses under identical experimental conditions was not previously reported. In this work, COD has been selected as an adequate industrial water quality measure toward the establishment of a representative standard test method. The initial COD values of six organic pollutants representing dye, surfactants, phenols and alcohol were set at 30 ± 2 mg/L. Ten of different commercial and synthesized TiO 2 samples representing anatase, rutile and mixed phases were used and characterized. The data of photocatalytic processes were compared to that obtained using the commonly widespread Degussa-P25 TiO 2 (TD). The COD of all pollutants was completely removed by TD at UV exposure dose B9.36 mWh/cm 2 . Consequently, the maximum irradiation dose was set at this value in all experiments. The percentages of COD removal as well as the values of the accumulated UV doses required for complete removal of pollutants were measured using the different TiO 2 samples. TiO 2 samples show different performance abilities toward the various pollutants compared to TD. Based on the obtained data, TiO 2 photocatalysts were divided into two categories according to the hydroxyl radical formation rates. Comparison with previous studies reveals that the photocatalytic efficiency evaluation depends on the method of measurement. COD is recommended to be used as an adequate technique of analysis that meets the purpose of water treatment applications.

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UV and solar-based photocatalytic degradation of organic pollutants by nano-sized TiO2 grown on carbon nanotubes

Cited by 129 publications

References 37 publications

Nanomaterials for the Abatement of Pharmaceuticals and Personal Care Products from Wastewater

Nanomaterials for the Abatement of Pharmaceuticals and Personal Care Products from Wastewater

FeOx magnetization enhancing E. coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

Photocatalytic activity evaluation of TiO2 nanoparticles based on COD analyses for water treatment applications: a standardization attempt

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