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UV irradiation

Tìm thấy 10+ kết quả cho từ khóa "UV irradiation"

Influence of mn2 concentration and uv irradiation time on the luminescence properties of mn doped zns nanocrystals

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As can be seen, these curves have the tendency to saturate with increasing irradiation time. Similar behavior is obtained for the the 2.7 eV band under continuous UV irradiation. The line of 2.1 eV-6 at% Mn The line of 2.1 eV-12 at% Mn The line of 2.1 eV- 9 at% Mn. UV irradiation time (s). The dependence of the PL intensity of the 2.1 eV emission band (orange emission) on the UV irradiation time for ZnS nanocrystal samples with Mn doping concentration of 6, 9, and 12 at%..

Ultrashort-term dual ultraviolet-irradiated nickel-doped titanium dioxide nanoparticle mesh for photocatalytic disinfection with minimum exposure risk to human health

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Antibacterial activity of NieTiO 2 mesh against E. coli under dual UV irradiation: Plots of log (CFU/mL) versus NieTiO 2 mesh size at (A) 5-sec dual UV irradiation and 10- or 30- min incubation, and (B) 5- or 10-sec dual UV irradiation and 30-min incubation. The results demonstrate a highly enhanced disinfection ef fi ciency even with low-dose photocatalysts under ultrashort-term dual UV irradiation in combined photocatalytic disinfection.

Characterization of curcumin loaded starch nanoparticles from native cassava and potato starches

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The proportion of curcumin remaining in samples under treatment with UV irradiation at the wavelengths of 254 and 365 nm was recorded at and 24 h. Figures 2A and 2B show the positive protection ability of curcumin loaded starch nanoparticles from UV irradiation with a wavelength of 254 nm and 365 nm, respectively.

Synthesis and characterization of hierarchical CEO2 spherical nanoparticles for photocatalytic degradation of methylene blue

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UV-Vis spectra curves of different MB concentrations versus time under UV irradiation of CeO 2 -80 nanocatalysts: (a) 5 ppm, (b) 10 ppm, (c) 15 ppm, and (d) 20 ppm.. CeO 2 -80@ 15 ppm. CeO 2 -80@10 ppm. 0 min 3 min 6 min 9 min 12 min 15 min 18 min. CeO 2 -80@5 ppm. 0 min 3 min 6 min 9 min. Wavelength (nm) CeO 2 -80@20 ppm. To characterize the photocatalytic activity of the prepared CeO 2 nanomaterials, we used the photodegradation reaction of methylene blue (MB) under UV irradiation.

The release process of microfibers: from surgical face masks into the marine environment

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Mass analysis indicated an average mass loss of 0.19% estimated for the seven surgical masks submitted to the artificial aging procedure.. 2 shows the SEM micrographs of surgical masks before and after the exposition to the UV-A aging cycles. After application of UV irradiation, the pronounced dam- age caused to the fibers structure due to the photo and thermal degrada- tion of the material was instead clearly observable (right side of Fig.

Highly photocatalytic activity of natural halloysite - based material for the treatment of dyes in wastewater

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The results showed that after 360 minutes of UV irradiation using 0.15 g of Ag - TiO 2 /HNT, the efficiency in RR - 195 degradation was 96%. when the amount of catalyst increases, the amount of catalytic activity sites increases, causing the diffusion rate of the anions RR - 195 to the active sites on the surface, leading to an increase the number of 96% shows the almost complete decomposition of contaminants under normal conditions..

Nghiên cứu tổng hợp TiO2 và khả năng ứng dụng để xử lý Cr6+ trong nước thải = Reseach on synthesis of TiO2 and application for Cr6+ treatment in wastewater

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Concentration of Cr(VI) in reaction solution with and without Flocculation Catalyst sample IG 30 without UV solar was used to determine how much Cr(VI) absorbed onto the titanium dioxide and the activity of the catalyst without UV irradiation. It seems that there was no difference of the concentration Cr(VI) between the solution which was added K2HPO4 and Al2(SO4)3 to pretreat solution then filtered and the solution without experiencing flocculation process.

The impact of alkaline earth oxides on Bi2O3 and their catalytic activities in photodegradation of Bisphenol A

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Because of the band gap value of Bi 2 O 3 , we studied the photocatalytic degradation of Bisphenol-A under UV irradiation.. XRD patterns of Bi 2 O 3 , 5MgO-Bi 2 O 3 , 5CaO-Bi 2 O 3 , 5SrO-Bi 2 O 3 catalysts.. In the photocatalytic degradation experiments, the surface OH groups can not only embrace the photogenerated holes to form hydroxyl radical (•OH) but also serve as active sites for the adsorption of reactants [24].

Application of the Taguchi approach to optimize ZnO synthesis via hydrothermally assisted sol-gel method

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The photoactivity of the samples was measured by evaluating the degradation of methylene blue (MB) under UV irradiation

Biochemistry, 4th Edition P93

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Repair of Pyrimidine Dimers Formed by UV Light UV irradiation promotes the for- mation of covalent bonds between adjacent thymine residues in a DNA strand, creat- ing a cyclobutyl ring (Figure 28.27). FIGURE 28.27 UV irradiation causes dimerization of adja- cent thymine bases. A cyclobutyl ring is formed between carbons 5 and 6 of the pyrimidine rings.

Organic photo catalyst for controlled synthesis of poly(methyl methacrylate) using spirooxazine initiator

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The solution of PMMA-SP in THF (0.16 mM) was prepared to check the absorption of PMMA-SP after and before irradiation. Before irradiation process, the solution of PMMA-SP has a colorless. PMMA-SP solution was irradiated under 365 nm of UV light, the colorless solution immediately changes to light blue and come back the colorless if removing of UV-irradiation. The Figure 4 exhibited the color exchange of PMMA-SP under UV-irradiation.. UV-Vis of PMMA-SP under UV-irradiation.

Chế tạo nano bạc trên giá mang Montmorillonite

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. "Antibacterial effect of synthesized silver-montmorillonite nanocomposites by UV-Irradiation Method.". Research Journal of Biological Sciences . "Synthesis and antibacterial activity of silver- montmorillonite nanocomposites.". American Journal of Applied Sciences . "Synthesis and characterization of silver-clay nanocomposites by chemical reduction method.". "Synthesis and UV-VIS spectroscopic study of silver nanoparticles in aqueous SDS solution".

Investigation of the effect of PAn and PAn/ZnO photocatalysts on 100% degradation of Congo red under UV visible light irradiation and lightless environment

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The photocatalytic activities of PAn and PAn/ZnO (0.1g/100ml) on the degradation of the Congo red (CR) dye were studied under the UV visible light irradiation and the lightless environment and the efficiency of catalysts have been explained in details. Contribution of UV visible light irradiation on the 100% degradation of CR dye for the PAn and PAn/ZnO photocatalyst is determined..

Ag-grafted on ZnO nanorod arrays using UV-assisted irradiation for enhanced SERS behavior in CV detection

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The growth of ZnO NR ar- rays on ZnO seed layer using hydrothermal method and Ag NPs deposition on the surface of ZnO NRs by photoreduction method were proposed by UV- assisted irradiation. The synthesized Ag/ZnO NRS substrate shows good SERS activity at a low concen- tration of CV molecules compared to the pristine ZnO. A mechanism of SERS activity of Ag/ZnO NRs active-platform is proposed..

Excellent photocatalytic activity of ternary Ag@WO3@rGO nanocomposites under solar simulation irradiation

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S6 also shows the UV-visible absorption spectra ( l ¼ 551 nm) of RhB corresponding to its adsorption in the darkness and photo-degradation over WO 3 , Ag-1@WO 3 , Ag- 3@WO 3 , Ag-5@WO 3 , and Ag-3@WO 3 @rGO under solar simulation irradiation.. 7b, the Ag@WO 3 exhibits a remarkably higher photocatalytic activity than the Ag-free counterpart (the so-called bare WO 3. As compared to that of the bare WO 3 (17.0. the Ag- 1@WO 3 (1.0 wt.

Impact of UV-B radiation on some biochemical changes and growth parameters in Echinacea purpurea callus and suspension culture

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Growing the callus cultures under 4 lamps of UV-B for 2 h showed the maximum level of caffeic acid derivatives (0.0299 mg/g D.Wt), followed by 0.0265 mg/g D.Wt caffeic acid derivatives when growing under 2 lamps of UV-B for 2 and 6 h irradiation.

Effect of gamma irradiation on the viability and cellulase production of some filamentous fungi

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Gamma irradiation at 2 kGy of Aspergillus niger also enhances the production of carboxymethyl cellulase (CMCase) and filter paper cellulase (Fpase) (Mostafa, 2014. Shahbazi and orthers (2014) reported that Trichoderma reesei irradiated at 250 Gy of gamma ray produced a maximum amount of cellulase compared to wild type strains and UV-irradiated mutants.

The formation of ferulic acid from Gamma oryzanol hydrolysis under alkaline condition using ultrasonic irradiation

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Ferulic acid (FA) is a kind of antioxidants widely used in cosmetic industry in term of UV-protection, in food industry as additives, and deeply applied in medical field. Ferulic acid has been investigated to block the formation of nitrosamine from nitrites [1]. The stable radical of ferulic acid. Therefore, nowadays, the friendly environmental UV absorbents compounds are preferred to use such as ferulic acid..

N doping of TiO2 nanocrystal for efficient photodegradation of organic pollutants under ultraviolet and visible light irradiation

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N doping of TiO 2 nanocrystal for efficient photodegradation of organic pollutants under ultraviolet and visible light irradiation. Previous studies have shown that the performance of N-doped TiO 2 is closely related to the raw materials and synthesis methods. However, N-doped TiO 2 prepared by other methods showed the degradation of photoactivity under ultraviolet irradiation [24–26]. reported the N-doped TiO 2 via the vapor-thermal method, using urea as the N source [32].

Photoelectrical Characteristics of UV Organic Thin-film Transistor Detectors

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UV light (=365 nm) Gate electrode. Pentacene PMMA/DPA-CM. Head of UV light source (c). b, Absorbance spectra of photoactive dielectric of PMMA/DPA-CM and pentacene measured using. c, Illustration of cross-sectional structure and UV light irradiation method. The photoOTFT was fabricated by employing the previous method [14]. The fabrication process, device structure and the properties of the main materials are shown in Fig. PMMA and DPA-CM were dissolved in chloroform at.