Advanced removal of crystal violet dye from aqueous solutions by photocatalysis using commercial products containing titanium dioxide

Creţescu, Igor; Lutic, Doina

doi:10.5802/crchim.150

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…All current applications of photocatalysis use TiO 2 as a semiconductor for several reasons [66]. Titanium dioxide, in its current commercial forms, is not toxic (apart from recent reservations about the use of reservations regarding the use of nanoparticles) and, due to its photostability in air and water, does not release toxic elements [67]. As titanium is a relatively abundant element, the cost of TiO2 is not too high, at least for some applications.…”

Section: Photocatalytic Applicationsmentioning

confidence: 99%

Nanostructured Titanium Dioxide (NS-TiO₂)

Bejaoui,

Bouchmila,

Nefzi

et al. 2023

Updates on Titanium Dioxide

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During the past decade, research in the area of synthesis and applications of nanostructured titanium dioxide (NS TiO2) has become tremendous. NS TiO2 materials have shown great potential and a wide range of applications. The decrease in the particle size and the increase of the surface/volume ratio lead to the increase of the specific surface and the modification of the physicochemical properties and the appearance of new interesting properties (photocatalytic, optical, magnetic, electronic...). Their new morphology even allows the appearance of new biological properties. NS TiO2 can thus be used for the same applications as those known for their precursors before transformation and their nanostructures are accompanied by new properties allowing applications. This chapter briefly describes the synthesis process of the different NS TiO2, their chemical and surface modifications, and their application. The preparation of NS TiO2, including nanoparticles, nanorods, nanowires, nanosheets, nanofibers, and nanotubes is described. This chapter discusses the effects of precursor properties and synthesis conditions on the structure, crystallinity, surface specificity, and morphology of titanium dioxide nanoparticles. Recent advances in NS TiO2 in nano-biosensing, medical implants, drug delivery, and antibacterial fields, pharmaceutical applications, as well as their toxicity and biocompatibility, were presented.

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Section: Photocatalytic Applicationsmentioning

confidence: 99%

Nanostructured Titanium Dioxide (NS-TiO₂)

Bejaoui,

Bouchmila,

Nefzi

et al. 2023

Updates on Titanium Dioxide

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“…However, the main species strongly involved in this process were hydroxyl and superoxide radical [10,[30][31][32]. The performance of the UV/TiO 2 system on the degradation of CVD is known in the literature [33]. It should be noted that the added TiO 2 diffuses Reactive Oxygen Species into the solution.…”

Section: Coupled Adsorption-photocatalytic Experimentsmentioning

confidence: 99%

Sorbent and Photocatalytic Potentials of Local Clays for the Removal of Organic Xenobiotic: Case of Crystal Violet

et al. 2022

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Natural materials are widely used in the field of environmental remediation and are appreciated for their surface physical and chemical properties. Clay constitutes a typical example. In this work, we report the evaluation of sorbent and photocatalytic potentials of local clay of two irrigated rice field waters in the degradation of crystal violet. The structural, textural and compositional properties of the local clay were investigated by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD) and X-ray Fluorescence (XRF) analysis. The analysis results showed that these materials were composed mainly of quartz and kaolinite. The efficiency of these adsorbents (Y. Clay and L. Clay) to eliminate crystal violet dye from aqueous medium was examined at different initial concentrations, pH, contact time, adsorbent dose and the possible interference of inorganic salts from fertilizers. Kinetic studies showed that the adsorption process was well described by the pseudo-second order model and the equilibrium modelling results fitted adequately to the Freundlich model. The maximum amount of uptake capacity achieved at pH 2.0 was 18.40 (mg·g−1) and 20.40 (mg·g−1), respectively, for Y. Clay and L. Clay. The evaluation of the photocatalytic potential showed that the raw clay samples do not show photocatalytic activities during the 30 min of exposure to UV light. On the other hand, their photocatalytic potential is manifested when loaded with titanium dioxide (TiO2). Clays coupled with TiO2 under UV light showed an improvement in the degradation of the crystal violet dye by 15%. The synergistic effects between the high photocatalytic activity of TiO2 and the strong adsorption capacity of clays can be one promising technique for in situ remediation of contaminated soaked rice field.

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“…Extensive research has been conducted aiming at the development of optimized homogeneous and heterogeneous photocatalytic approaches for the decomposition and detoxification of hazardous organic substances in aqueous solutions, such as antibiotics [ 13 , 15 , 16 , 17 ], pesticides [ 18 , 19 , 20 ] and dyes [ 21 , 22 , 23 , 24 ]. Similar studies have been conducted for the evaluation of the photocatalytic inactivation of microorganisms in suspension [ 25 ], focusing on endospores, considered to be one of the most resistant targets [ 12 , 26 , 27 ], viruses [ 28 , 29 , 30 ], fungi [ 14 ], Gram-positive and Gram-negative bacteria [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Photo-Fenton and TiO2 Photocatalytic Inactivation of Model Microorganisms under UV-A; Comparative Efficacy and Optimization

et al. 2023

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Photocatalytic inactivation of pathogens in aqueous waste is gaining increasing attention. Several homogeneous and heterogeneous photocatalytic protocols exist using the Fenton’s reagent and TiO2, respectively. A comprehensive study of homogeneous and heterogeneous photocatalysis on a range of microorganisms will significantly establish the most efficient method. Here, we report a comparative study of TiO2- and Fe+3-based photocatalytic inactivation under UV-A of diverse microorganisms, including Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, bacterial spores (Bacillus stearothermophilus spores) and viruses (MS2). We also present data on the optimization of TiO2 photocatalysis, including optimal catalyst concentration and H2O2 supplementation. Our results indicate that both photo-Fenton and TiO2 could be successfully applied for the management of microbial loads in liquids. Efficient microorganism inactivation is achieved with homogeneous photocatalysis (7 mg/L Fe+3, 100 mg/L H2O2, UV-A) in a shorter processing time compared to heterogeneous photocatalysis (0.5 g/L TiO2, UV-A), whereas similar or shorter processing is required when heterogenous photocatalysis is performed using microorganism-specific optimized TiO2 concentrations and H2O2 supplementation (100 mg/L); higher H2O2 concentrations further enhance the heterogenous photocatalytic inactivation efficiency. Our study provides a template protocol for the design and further application for large-scale photocatalytic approaches to inactivate pathogens in liquid biomedical waste.

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Advanced removal of crystal violet dye from aqueous solutions by photocatalysis using commercial products containing titanium dioxide

Cited by 6 publications

References 34 publications

Nanostructured Titanium Dioxide (NS-TiO₂)

Nanostructured Titanium Dioxide (NS-TiO₂)

Sorbent and Photocatalytic Potentials of Local Clays for the Removal of Organic Xenobiotic: Case of Crystal Violet

Photo-Fenton and TiO2 Photocatalytic Inactivation of Model Microorganisms under UV-A; Comparative Efficacy and Optimization

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Advanced removal of crystal violet dye from aqueous solutions by photocatalysis using commercial products containing titanium dioxide

Cited by 6 publications

References 34 publications

Nanostructured Titanium Dioxide (NS-TiO2)

Nanostructured Titanium Dioxide (NS-TiO2)

Sorbent and Photocatalytic Potentials of Local Clays for the Removal of Organic Xenobiotic: Case of Crystal Violet

Photo-Fenton and TiO2 Photocatalytic Inactivation of Model Microorganisms under UV-A; Comparative Efficacy and Optimization

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Product

Resources

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Nanostructured Titanium Dioxide (NS-TiO₂)

Nanostructured Titanium Dioxide (NS-TiO₂)