Immobilized rGO/TiO2 Photocatalyst for Decontamination of Water

Žouželka, Radek; Remzova, Monika; Plšek, Jan; Brabec, Libor; Rathouský, Jiřı́

doi:10.3390/catal9090708

Cited by 34 publications

(23 citation statements)

References 44 publications

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“…Recently, innovative systems based on carbon nanotubes, nanofibers, graphene, and graphene oxide have been proposed in the scientific literature, aiming to improve the purification ability with reduced amount of sorbent material [9][10][11]. Although the effectiveness of such novel carbon-based materials is well-known and demonstrated, their use still presents open problems.…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

et al. 2020

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This work focuses on the investigation of the capability of reduced graphene oxide (rGO) filters to remove metals from various wastewater. The process to produce rGO membranes is reported and discussed, as well as their ability to capture ions in complex solutions, such as tap or industrial wastewater. Multi-ion solutions, containing Cu2+, Fe3+, Ni2+, and Mn2+ to simulate mine wastewater, or Ca2+ and Mg2+ to mimic drinkable water, were used as models. In mono-ionic solutions, the best capture efficiency values were proved for Ca2+, Fe3+, and Ni2+ ions, while a matrix effect was found for multi-ion solutions. However, interesting capture efficiencies were measured in the range of 30–90%, depending on the specific ion, for both single and multi-ion solutions. An attempt is proposed to correlate ions capture efficiency with ions characteristics, such as ionic radius or charge. Combining a satisfactory capture efficiency with low costs and ease of treatment unit operations, the approach here proposed is considered promising to replace other more complex and expensive filtration techniques.

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Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

et al. 2020

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“…where fn is TKN/VSS (total Kjeldahl nitrogen/volatile suspended solids) ratio of the activated sludge (mg N/mg VSS), fEH is the unbiodegradable fraction of heterotrophic microorganisms in endogenous To further highlight the impact of the studied chlorophenols and the intermediates formed during photocatalytic degradation on the activated sludge used in this work, the determination of the maximum specific heterotrophic growth rate (μ m ) was carried out from oxygen uptake rate (OUR) measurements in batch experiments. Its value was calculated according to the model proposed by Ekama et al [35].μ m = K ms Y H (10) where K ms is the maximum readily biodegradable substrate uptake rate (mg COD/mg AVSS/d), and Y H is the yield coefficient for heterotrophs (mg VSS/mg COD). AVSS (active volatile suspended solids), VSS (volatile suspended solids).…”

Section: Biodegradability Of Photocatalyzed Chlorophenolsmentioning

confidence: 99%

“…Due to their specific characteristics, which place them in the category of toxic organic compounds, they have a negative effect on the aquatic ecosystem, and also on human health [3]. For this reason, a wide range of methods for removing them from aqueous solutions have been developed over time, the most known being adsorption on various adsorbents [4], and advanced oxidation processes [5,6] of which photocatalytic oxidation has received special attention lately [7][8][9][10][11]. Although many of these methods have been shown to be effective in removing chlorophenols from many aqueous systems, their large-scale application is often difficult both technically and economically.…”

Section: Introductionmentioning

confidence: 99%

Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

Bobiricǎ

Orbeci

2020

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Given the known adverse effect of chlorophenols for the aquatic environments which they can reach, the development of efficient methods both technically and economically to remove them has gained increasing attention over time. The combination of photocatalytic oxidation with biological treatment can lead to high removal efficiencies of chlorophenols, while reducing the costs associated with the need to treat large volumes of aqueous solutions. Therefore, the present paper had as its main objective the identification of the minimum photocatalytic oxidation period during which the aqueous solutions of 4-chlorophenol and 2,4-dichlorophenol can be considered as readily biodegradable. Thus, the results of photocatalytic oxidation and biodegradability tests showed that, regardless of the concentration of chlorophenol and its type, the working solutions become readily biodegradable after up to 120 min of irradiation in ultraviolet light. At this irradiation time, the maximum organic content of the aqueous solution is less than 40%, and the biochemical oxygen demand and chemical oxygen demand (BOD/COD) ratio is much higher than 0.4. The maximum specific heterotrophic growth rate of activated sludge has an average value of 4.221 d−1 for 4-chlorophenol, and 3.126 d−1 for 2,4-dichlorophenol. This irradiation period represents at most half of the total irradiation period necessary for the complete mineralization of the working solutions. The results obtained were correlated with the intermediates identified during the photocatalytic oxidation. It seems that, working solutions initially containing 4-chlorophenol can more easily form readily biodegradable intermediates.

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“…Application of inorganic semiconductors as heterogeneous photocatalysts, and in particular the role of TiO 2 in environmental and biomedical sciences and technologies, has already been extensively investigated. The most efficient methods in this respect are advanced oxidation processes (AOPs) including environmental [1][2][3][4] and biomedical photocatalysis [5][6][7][8][9]. Semiconductor-based photocatalysts are routinely used in the degradation of dyes present in waste-water for the following reasons: (i) they are inexpensive and can be obtained easily in a large-scale preparation; (ii) they are non-toxic; (iii) they exhibit tunable properties that can be modified by the size of the particles, doping, and/or sensitization; (iv) they facilitate electron transfer processes; and (v) they are capable of extending their use without substantial loss in the photocatalytic activity [10].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Nanocrystalline TiO2 Materials with Sulfonated Porphyrins for Visible Light Antimicrobial Therapy

et al. 2019

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Highly-active, surface-modified anatase TiO2 nanoparticles were successfully synthesized and characterized. The morphological and optical properties of the obtained (metallo)porphyrin@qTiO2 materials were evaluated using absorption and fluorescence spectroscopy, scanning electron microscopy (SEM) imaging, and dynamic light scattering (DLS). These hybrid nanoparticles efficiently generated reactive oxygen species (ROS) under blue-light irradiation (420 ± 20 nm) and possessed a unimodal size distribution of 20–70 nm in diameter. The antimicrobial performance of the synthetized agents was examined against Gram-negative and Gram-positive bacteria. After a short-term incubation of microorganisms with nanomaterials (at 1 g/L) and irradiation with blue-light at a dose of 10 J/cm2, 2–3 logs of Escherichia coli, and 3–4 logs of Staphylococcus aureus were inactivated. A further decrease in bacteria viability was observed after potentiation photodynamic inactivation (PDI), either by H2O2 or KI, resulting in complete microorganism eradication even when using low material concentration (from 0.1 g/L). SEM analysis of bacteria morphology after each mode of PDI suggested different mechanisms of cellular disruption depending on the type of generated oxygen and/or iodide species. These data suggest that TiO2-based materials modified with sulfonated porphyrins are efficient photocatalysts that could be successfully used in biomedical strategies, most notably, photodynamic inactivation of microorganisms.

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Immobilized rGO/TiO2 Photocatalyst for Decontamination of Water

Cited by 34 publications

References 44 publications

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

Surface Modification of Nanocrystalline TiO2 Materials with Sulfonated Porphyrins for Visible Light Antimicrobial Therapy

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