Performance of commercial titanium dioxide samples in terms of dye photodegradation assessed using smartphone-based measurements

Danyliuk, Nazarii; Tatarchuk, Tetiana; Mironyuk, Ivan; Kotsyubynsky, Volodymyr; Mandzyuk, Volodymyr

doi:10.15330/pcss.23.3.582-589

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…The final concentration of the dye in the solution was determined with a Ulab 102UV spectrophotometer. A detailed description of this technique and calibration dependences are given in [21]. The percentage of dye degradation was determined by equation ( 1):…”

Section: Evaluation Of Photocatalytic Performancementioning

confidence: 99%

Structural, morphological and photocatalytic properties of nanostructured TiO2/AgI photocatalyst

Mironyuk

Danyliuk

Turovska

et al. 2023

Phys. Chem. Solid St.

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Nanostructured TiO2/AgI photocatalyst under the action of ultraviolet or visible electromagnetic radiation effectively neutralizes organic pollutants in the aqueous environment. It is a nanostructure in which micro- and small mesopores of anatase TiO2 are filled with silver iodide in the superionic state. The content of the α-AgI ion-conducting phase in the volume of ТіО2 pores can be ~20 wt %. To obtain a photocatalyst, titanium dioxide is synthesized by the sol-gel method, using a titanium aquacomplex solution [Ti(OH2)6]3+•3Cl- and a Na2CО3 modifier additive as a precursor. The modifying additive during synthesis ensures the fixation of =О2СО carbonate groups on the surface of oxide material particles. The presence of these groups leads to an increase in both the pore volume and the specific surface area of ТіО2. The specific surface area of carbonized titanium dioxide is 368 m2•g-1, the pore volume is 0.28 cm3•g-1, and their size is 0.9-4.5 nm. To fill the micro- and small mesopores of TiO2 with the superionic α-AgI phase, Ag+ cations are first adsorbed from the AgNO3 solution on the titanium dioxide surface, and then the oxide material is contacted with the KI solution. Compared to the Evonik P25-TiO2 photocatalyst, the nanostructured TiO2/AgI photocatalyst demonstrates a significantly higher efficiency of photodegradation of organic dyes Congo Red and Methyl Orange in visible and ultraviolet radiation. The most active ТіО2/40AgI sample achieved complete degradation of the CR dye in 6 minutes of UV irradiation, while the efficiency of commercial Р25-TiO2 over the same time was only 42%.

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Section: Evaluation Of Photocatalytic Performancementioning

confidence: 99%

Structural, morphological and photocatalytic properties of nanostructured TiO2/AgI photocatalyst

Mironyuk

Danyliuk

Turovska

et al. 2023

Phys. Chem. Solid St.

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“…Additionally, Keller et al [ 16 ] used a smartphone combined with a Python-written data processing program to obtain kinetic data on dye adsorption and photocatalytic degradation through changes in the digital image’s RGB intensity. Similarly, Danyliuk et al [ 17 , 18 ] used a smartphone to measure the photodegradation rate. Furthermore, Fu et al [ 19 ] used a diamond prism to achieve total reflection infrared tracking of the liquid–solid interface in photochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Automated Monitoring System for Suspended Photocatalytic Batch Reactions Based on Online Circulatory Spectrophotometry

Lei,

Huang

2024

Nanomaterials

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Employing an automated monitoring system (AMS) for data acquisition offers benefits, such as reducing the workload, in the kinetic study of suspended photocatalytic batch reactions. However, the current methods in this field tend to narrowly focus on the substrate and often overlook the optical characteristics of both the mixture and solid particles. To address this limitation, in this study, we propose a novel AMS based on online circulatory spectrophotometry (OCS) and incorporate debubbling, aeration, and segmented flow (DAS), named DAS-OCS-AMS. Initially, a debubbler is introduced to mitigate the issue of signal noise caused by bubbles (SNB). Subsequently, an aerated and segmented device is developed to address the issue of particle deposition on the inner wall of the pipeline (PDP) and on the windows of the flow cell (PDW). The proposed DAS-OCS-AMS is applied to monitor the kinetics of the photocatalytic degradation of Acid Orange Ⅱ by TiO2 (P25), and its results are compared with those obtained using the traditional OCS-AMS. The comparative analysis indicates that the proposed DAS-OCS-AMS effectively mitigates the influence of SNB, PDP, and PDW, yielding precise results both for the mixture and solid particles. The DAS-OCS-AMS provides a highly flexible universal framework for online circulatory automated monitoring and a robust hardware foundation for subsequent data processing research.

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“…Anatase modification has the maximum photocatalytic activity. Nanoscale TiO 2 with a rutile:anatase ratio of 30:70 is used as an industrial photocatalyst Degussa P25 [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Evaluation of Properties of an Additive Based on Bismuth Titanates for Cement Systems

Samchenko,

Kozlova,

Korshunov

et al. 2023

Materials

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The development of modern building materials science involves the process of designing innovative materials that exhibit unique characteristics, such as energy efficiency, environmental friendliness, self-healing ability, and photocatalytic properties. This can be achieved by modifying cement with nano- and fine-dispersed additives that can give the material new properties. Such additives include a number of compounds based on the TiO2-Bi2O3 system. These compounds have photocatalytic activity in the near-UV and visible range of the spectrum, which can serve to create photocatalytic concretes. Here, the purpose of this scientific study was to synthesize compounds based on the TiO2-Bi2O3 system using two methods in order to identify the most optimal variant for creating a composite material and determine its properties. Within the framework of this article, two methods of obtaining a photocatalytically active additive based on the TiO2-Bi2O3 system are considered: the solid-state and citrate-based methods. The photocatalytic, mechanical and structural properties of composites containing the synthesized additive are investigated. In this study, it was found that for the creation of photocatalytic concretes, it is advisable to use cement compositions with a bismuth titanate content of 3–10 wt.%. of the cement content, regardless of the method of obtaining the additive. However, the most optimal composition is one containing 5 wt.% of the synthesized additive. It is noted that compositions containing 5% by weight of bismuth titanate demonstrate photocatalytic activity and also show an increase in strength on the first day of hardening by 10% for the solid-state method and 16% for the citrate method.

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Performance of commercial titanium dioxide samples in terms of dye photodegradation assessed using smartphone-based measurements

Cited by 3 publications

References 20 publications

Structural, morphological and photocatalytic properties of nanostructured TiO2/AgI photocatalyst

Structural, morphological and photocatalytic properties of nanostructured TiO2/AgI photocatalyst

Automated Monitoring System for Suspended Photocatalytic Batch Reactions Based on Online Circulatory Spectrophotometry

Synthesis and Evaluation of Properties of an Additive Based on Bismuth Titanates for Cement Systems

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