tio2 powder
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Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1492
Author(s):  
Karna Wijaya ◽  
Alya Rahmadhani Putri ◽  
Sri Sudiono ◽  
Sri Mulijani ◽  
Aep Patah ◽  
...  

This SO4/TiO2 catalyst as a heterogeneous acidic catalyst was synthesized in various concentrations of H2SO4. The activity and selectivity of the SO4/TiO2 catalyst on the dehydration reaction of ethanol to diethyl ether were studied as well. The SO4/TiO2 was prepared from TiO2 powder by wet impregnation method with a various aqueous solution of H2SO4 (1; 2; 3 M H2SO4) and calcination temperature (400, 500, and 600 °C) to obtain a catalyst with optimum acidity. The catalysts were characterized using FTIR, XRD, SEM-EDX, SAA, TGA/DSC, and acidity test gravimetrically with ammonia. The liquid product of DEE was analyzed by gas chromatography (GC) to analyze the selectivity of the catalyst. The catalyst TS-3-400 had the highest activity and selectivity in the dehydration reaction of ethanol to diethyl ether at a temperature of 225 °C, with a conversion of 51.83% and a DEE selectivity of 1.72%.


Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1511
Author(s):  
Martina Novotná ◽  
Petr Knotek ◽  
Tomáš Hanzlíček ◽  
Petr Kutálek ◽  
Ivana Perná ◽  
...  

This article studies the photocatalytic activity of three types of industrially produced TiO2 powder (P25, CG100 and CG300) incorporated into a parent geopolymer matrix, and their pure counterparts, based on the decomposition of Rhodamine B dye. Rhodamine B dye is applied as a model substance because it is frequently used in the textile industry and thus may be present in the wastewater. The average particle size, specific surface area and mineralogical composition of TiO2 powders have been determined. The geopolymer matrix works well as a supporting material for the CG100 and P25 pure types of TiO2 powder as these input materials have better properties such as a higher average particle size, lower specific surface area, mineralogicalcomposition, etc., than the CG300 TiO2 powder. These properties (or their combination) affect the photocatalytic activity of the resulting materials, which may thus become advanced composites with an additional purifying ability, e.g., materials that can be used for wastewater treatment or air purification.


Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1432
Author(s):  
Sandra Sakalauskaite ◽  
Deimante Vasiliauske ◽  
Emilija Demikyte ◽  
Rimantas Daugelavicius ◽  
Martynas Lelis

The beneficial photocatalytic properties of UV light activated TiO2 powder are well-known and have been demonstrated with various pollutants and pathogens. However, traditionally observed photocatalytic activity of visible light activated pristine TiO2 is insignificant but there are a few studies which have reported that under some specific conditions commercially available TiO2 powder could at least partially disinfect microorganisms even under visible light. To better understand this phenomenon, in the current study we focused on bacteria response to the treatment by visible light and P25 TiO2 powder. More specifically, we analyzed the relationship between the bacteria viability, outer membrane permeability, metabolism, and its capacity to generate intracellular reactive oxygen species. During the study we assayed the viability of treated bacteria by the spread plate technique and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) reduction method. Changes in bacterial outer membrane permeability were determined by measuring the fluorescence of N-phenyl-1-naphthylamine (NPN). To detect intracellular reactive oxygen species formation, the fluorescence of dichlorodihydrofluorescein diacetate (DCFH-DA) was assayed. Results of our study indicated that TiO2 and wide spectrum visible light irradiation damaged the integrity of the outer membrane and caused oxidative stress in the metabolizing bacteria. When favorable conditions were created, these effects added up and unexpectedly high bacterial inactivation was achieved.


2021 ◽  
Vol 1047 ◽  
pp. 103-110
Author(s):  
Nuchanaporn Pijarn ◽  
Wisallaya Jankasemsook ◽  
Supanida Suwantha ◽  
Janpen Intaraprasert

The objective of this research was to prepare ready-to-use TiO2 and ZnO in slurry form for ready-to-use in facial foundation sunscreen. Two types of TiO2 sources were prepared as TiO2 slurry namely commercial TiO2 powder and synthesized TiO2 powder. Preparation of formula 1, 35 g solution PEG-10 dimethicone, and added 20 g solution cyclomethicone after that 45 g TiO2 powder was added slowly to the prepared substance, stirring and heated to 60-70 °C, and stir until the substance mix well. Formula 2, 46 g solution cyclomethicone added 2.5 g stearic acid and 2 g aluminum hydroxide after that stirring and heated to 60-70 °C until the substance mixed well, and TiO2 powder 49.5 g was added slowly to the continuous stirred and heated. On the other hand, ZnO slurry was prepared in the same steps. The results show that formula 1was the best formulation. Due to it was not precipitation and good compatibility with an emulsifier, therefore, formula 1was chosen to study in various volumes. The texture and stability of the prepared slurry were similar to the commercial slurry. Two sunscreen formulas were differently formulated by containing prepared and commercial slurry and evaluated. There were no significant differences in results between prepared slurry and commercial slurry. To investigate the satisfaction of products, 30 volunteers were asked to use products for one week and answer the questionnaires. The product containing prepared slurry was satisfied by 93.33% of volunteers, whereas the product containing commercial slurry was satisfied by 76.66% of volunteers.


Author(s):  
Nesrine Jaouabi ◽  
Wala Medfai ◽  
Marouan Khalifa ◽  
Rabia Zaghouani ◽  
Hatem Ezzaouia

The titanium dioxide (TiO2) purity is very important for the TiO2-based applications making essential the impurities density reduction. In this study, we propose an efficient purification process of TiO2 powder in order to reduce impurities. The low-cost proposed approach is based on an iterative gettering (IG) process combining three main steps: (1) a porous TiO2 sacrificial layer formation (p-TiO2), (2) a rapid thermal annealing (RTA) of p-TiO2 powder in an infrared oven at 950°C under air permitting the residual impurities diffusion to the porous layer surface and (3) etching in acid solution to remove the porous layer. Effect of the proposed gettering process on purification efficiency was evaluated by different characterization techniques such as the transmission electron microscopy (TEM), the energy dispersive x-ray spectroscopy (EDX), the UV–Visible-NIR spectroscopy, the X-ray diffraction (XRD) and atomic absorption spectroscopy (AAS). The obtained results showed the efficient removal of metal impurities, such as Cu, Al, P, and Fe confirming the efficiency of the process improving the purity from 89% to 99.96%.


Author(s):  
Ying Zhang ◽  
Zhigang Zak Fang ◽  
Pei Sun ◽  
Zhe Huang ◽  
Shili Zheng
Keyword(s):  

ACS Catalysis ◽  
2021 ◽  
pp. 8226-8238
Author(s):  
Tina Jingyan Miao ◽  
Chao Wang ◽  
Lunqiao Xiong ◽  
Xiyi Li ◽  
Jijia Xie ◽  
...  

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