Structuring efficient photocatalysts into bespoke fiber shaped systems for applied water treatment

Theodorakopoulos, George; Romanos, George E.; Katsaros, Fotios K.; Papageorgiou, Sergios K.; Kontos, Athanassios G.; Spyrou, Konstantinos; Beazi-Katsioti, Margarita; Falaras, Polycarpos

doi:10.1016/j.chemosphere.2021.130253

Cited by 5 publications

(9 citation statements)

References 48 publications

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“…In B1_600 and B2_600 samples, average copper content reached ~3.0% (mean value from 10 different areas). This value was expected based on the alginates’ sorption capacity documented in the literature [ 26 ], and previously reported in prepared ceramics in the form of fibers [ 36 ].…”

Section: Resultssupporting

confidence: 80%

“…Adsorption and photocatalysis quite commonly exhibit synergistic effects especially when high efficiency adsorbents (e.g., activated carbon) reside in the structured photocatalyst’s pores [ 36 ]. In that regard, both photocatalysis and adsorption were investigated in order to obtain an estimation of the beads’ overall performance.…”

Section: Resultsmentioning

confidence: 99%

“…Obviously, higher BET surface area and pore volume significantly contribute to enhanced MO adsorption capacity of these carbon containing samples, since the MO adsorption capacity converges with their TPV and BET ranking. However, differences related to the residual carbon’s oxygenated groups speciation and percentage [ 36 ] can result in different MO adsorptivity between B1_600 and B2_600 beads. Hence, pore properties and NPs content may not be the sole factors contributing to the higher MO adsorptivity of B2_600 compared to B1_600 samples [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…The dope solution for the preparation of the ceramic TiO 2 beads (150 mL) was prepared according to the procedure described in our previous work [ 36 ]. The TiO 2 /alginate ratio was defined after repeated trials aiming to optimize the material’s mechanical stability.…”

Section: Methodsmentioning

confidence: 99%

“…Evaluation of the photocatalytic efficiency of the prepared ceramic beads was performed via batch experiments. The experimental conditions applied and the photocatalytic reactor used are described in more detail in a previous work [ 36 ]. In typical photocatalytic experiments, MO adsorption capacity (dark), photocatalytic oxidation efficiency, and UV irradiation reaction kinetics were determined using 30 mL of a 12 ppm MO solution and 75 mg of ceramic beads in a borosilicate glass cell.…”

Section: Methodsmentioning

confidence: 99%

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Engineering Commercial TiO2 Powder into Tailored Beads for Efficient Water Purification

et al. 2022

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In this study, efficient commercial photocatalyst (Degussa P25) nanoparticles were effectively dispersed and stabilized in alginate, a metal binding biopolymer. Taking advantage of alginate’s superior metal chelating properties, copper nanoparticle-decorated photocatalysts were developed after a pyrolytic or calcination-sintering procedure, yielding ceramic beads with enhanced photocatalytic and mechanical properties, excellent resistance to attrition, and optimized handling compared to powdered photocatalysts. The morphological and structural characteristics were studied using LN2 porosimetry, SEM, and XRD. The abatement of an organic pollutant (Methyl Orange, MO) was explored in the dark and under UV irradiation via batch experiments. The final properties of the photocatalytic beads were defined by both the synthesis procedure and the heat treatment conditions, allowing for their further optimization. It was found that the pyrolytic carbon residuals enabled the adhesion of the TiO2 nanoparticles, acting as binder, and increased the MO adsorption capacity, leading to increased local concentration in the photocatalyst vicinity. Well dispersed Cu nanoparticles were also found to enhance photocatalytic activity. The prepared photocatalysts exhibited increased MO adsorption capacity (up to 3.0 mg/g) and also high photocatalytic efficiency of about 50% MO removal from water solutions, reaching an overall MO rejection of about 80%, at short contact times (3 h). Finally, the prepared photocatalysts kept their efficiency for at least four successive photocatalytic cycles.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Engineering Commercial TiO2 Powder into Tailored Beads for Efficient Water Purification

et al. 2022

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A critical review of sodium alginate-based composites in water treatment

Zheng,

Wang,

Bai

2024

Carbohydrate Polymers

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Kinetics study of the MO adsorption and photocatalytic degradation using an effectively engineered HF photocatalyst

Theodorakopoulos¹,

Katsaros²,

Papageorgiou³

et al.

Global NEST International Conference on Environmental Science &Amp; Technology

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In this study, copper decorated photocatalysts (Degussa P25), were shaped in the form of ceramic hollow fibers (HFs) and their photocatalytic properties were investigated using Methyl Orange (MO), a prototype anionic pollutant. The abatement of the dye was tested in dark and under UV irradiation by means of batch experiments and a possible mechanism was proposed for the MO photodegradation. The photocatalysts were subjected to a series of MO adsorption experiments at variable initial concentrations, while the adsorption data were interpreted using different models. In general, the data analysis implied favorable MO physisorption on photocatalyst under the conditions used in this work. Furthermore, the adsorption kinetics of the photocatalysts was studied using pseudo-first and pseudo-second order kinetic equations, as well as Bangham, Elovich and Weber-Morris kinetic models. For further elucidation of the photocatalytic mechanism, experiments were performed with either O2 or inert gas sparged MO solutions. It was concluded that the MO degradation rate followed the Langmuir-Hinshelwood (L-H) model. In order to explore the stability of the derived ceramic HFs, their photocatalytic efficiency was investigated in successive cycles of batch photocatalytic experiments. Finally, a simple regeneration process revealed that the efficient photocatalysts could be reused without severe deactivation of their performance.

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Structuring efficient photocatalysts into bespoke fiber shaped systems for applied water treatment

Cited by 5 publications

References 48 publications

Engineering Commercial TiO2 Powder into Tailored Beads for Efficient Water Purification

Engineering Commercial TiO2 Powder into Tailored Beads for Efficient Water Purification

A critical review of sodium alginate-based composites in water treatment

Kinetics study of the MO adsorption and photocatalytic degradation using an effectively engineered HF photocatalyst

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