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Journal articles on the topic 'DR UV-Vis'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Lutsenko, Larisa, Ludmila Oleksenko, German Telbiz, and Victoriia Gerasova. "Catalytic Activity in CO Oxidation of MnOx Supported on Oxide and Zeolite Carriers." French-Ukrainian Journal of Chemistry 3, no. 2 (2015): 54–64. http://dx.doi.org/10.17721/fujcv3i2p54-64.

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Catalytic activity in CO oxidation was investigated for MnOx-containing materials, prepared by impregnation of SiO2, Al2O3 and zeolites (ZSM-5, ERI). The catalysts were characterized by temperature-programmed reduction (TPR) by hydrogen, diffuse-reflectance UV–Vis (DR UV–Vis) and infra-red (IR) spectroscopy of adsorbed CO. Effect of the previous treatment of the MnOx-containing systems on the catalytic performance has been established. Higher catalytic activity in CO oxidation of the materials treated with air as compared with treated with hydrogen can be explained by presences of manganese io

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Bulánek, Roman, Libor Čapek, Michal Setnička, and Pavel Čičmanec. "DR UV–vis Study of the Supported Vanadium Oxide Catalysts." Journal of Physical Chemistry C 115, no. 25 (2011): 12430–38. http://dx.doi.org/10.1021/jp112206c.

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3

Andas, Jeyashelly, and Fatin Atiqah Md Alyas. "Structural Investigation of Ceria and Copper Modified Silica from Agricultural Biomass." Applied Mechanics and Materials 799-800 (October 2015): 32–36. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.32.

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Monometallic Ce, Cu and bimetallic Ce-Cu was successfully synthesized at room temperature using silica rice husk (RH) via sol-gel route and were characterized through several physicochemical techniques such as N2adsorption-desorption, XRD and DR/UV-Vis analyses. The prepared materials were designated as RH-10Cu, RH-20Ce and RH-10Cu20Ce. High mesoporosity with Type IV characteristics were evidenced for all the materials. The BET surface area registered for RH-10Cu, RH-20Ce and RH-10Cu20Ce were 396.02, 245.54 and 194.87 m2g-1respectively. Well-dispersion of metal species was clearly evidenced fr

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Tiong, Peggy, Hendrik O. Lintang, Salasiah Endud, and Leny Yuliati. "Reduced Graphene Oxide-Mesoporous Carbon Nitride as Photocatalyst for Removal of N-Nitrosopyrrolidine." Advanced Materials Research 1112 (July 2015): 184–87. http://dx.doi.org/10.4028/www.scientific.net/amr.1112.184.

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The fast electron-hole recombination in mesoporous carbon nitride (MCN) photocatalyst has spurred a great interest to improve its efficiency with addition of various modifiers. In the present study, the MCN was modified by reduced graphene oxide (rGO) that was synthesized via a novel photocatalytic reduction method with different ratios of GO to MCN to produce rGO-MCN composites. The synthesized rGO-MCN samples were characterized by X-ray diffractometer (XRD), diffuse reflectance UV-visible (DR UV-Vis), and Fourier transform infrared (FTIR) spectroscopies. It was confirmed that rGO was success

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Bielan, Zuzanna, Agnieszka Sulowska, Szymon Dudziak, Katarzyna Siuzdak, Jacek Ryl, and Anna Zielińska-Jurek. "Defective TiO2 Core-Shell Magnetic Photocatalyst Modified with Plasmonic Nanoparticles for Visible Light-Induced Photocatalytic Activity." Catalysts 10, no. 6 (2020): 672. http://dx.doi.org/10.3390/catal10060672.

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In the presented work, for the first time, the metal-modified defective titanium(IV) oxide nanoparticles with well-defined titanium vacancies, was successfully obtained. Introducing platinum and copper nanoparticles (NPs) as surface modifiers of defective d-TiO2 significantly increased the photocatalytic activity in both UV-Vis and Vis light ranges. Moreover, metal NPs deposition on the magnetic core allowed for the effective separation and reuse of the nanometer-sized photocatalyst from the suspension after the treatment process. The obtained Fe3O4@SiO2/d-TiO2-Pt/Cu photocatalysts were charac

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Mohd Anuar, Nur Izzati, and Jeyashelly Andas. "Synthesis and Characterization of Biomass Supported Ag, Co and Ag-Co Nanoparticles." Materials Science Forum 857 (May 2016): 480–84. http://dx.doi.org/10.4028/www.scientific.net/msf.857.480.

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Silica extracted from rice husk was used as a support to synthesize the monometallic Ag, Co and bimetallic Ag-Co nanoparticles. The nanoparticles were prepared via a sol-gel method by adding glucose as the reducing agent. The prepared nanoparticles were designated as Ag-NP, Co-NP and AgCo-NP. The successful incorporation of Ag/Co onto the silica surface were evidenced by TEM, FT-IR and DR/UV-Vis analysis. The TEM analysis showed the presence of small spherical shape nanoparticles with an average mean size of 3.18-3.57 nm. Through DR/UV-Vis analysis, the presence of Ag+ and cobalt in the oxidat

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Bashiri, Robabeh, Norani Muti Mohamed, Chong Fai Kait, and Suriati Sufian. "Influence of Hydrolysis Rate on Properties of Nanosized TiO₂ Synthesized via Sol-Gel Hydrothermal." Advanced Materials Research 1109 (June 2015): 286–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.286.

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This paper presents the effect of different H2O: TTIP (Titanium tetraisopropoxide) molar ratios of 8 to 64 during the synthesis using sol-gel associated hydrothermal method on the physical properties. Characterization of all synthesized TiO2 were accomplished by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) and total surface area measurement, transmission electron microscopy analysis (TEM) and diffuse reflectance UV–Vis spectroscopy (DR-UV-Vis). The XRD analysis showed that anatase (101) was the major phase for all photocatalysts as verified by TEM results. The growth of crystallites w

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Fan, Weiqiang, Meng Li, Jinfu Xu, Hongye Bai, Rongxian Zhang, and Chao Chen. "Synthesis and photocatalytic property of porous metal oxides nanowires based on carbon nanofiber template." Functional Materials Letters 08, no. 02 (2015): 1550018. http://dx.doi.org/10.1142/s1793604715500186.

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A series of porous metal oxides nanowires ( Fe 2 O 3, Co 3 O 4, NiO and CuO ) have been successfully synthesized, where commercial carbon nanofibers were used as the template. The obtained samples were systematically characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–Vis diffuse reflectance (UV–Vis DR) spectra and transmission electron microscope (TEM). According to the photodegradation data, the porous metal oxides nanowires exhibit significantly photocatalytic activity for degrading tetracycline (TC). Furthermore, the porous Fe 2 O 3 nanowires show the best phot

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9

Rahmawati, Fitria, Rini Wulandari, and Eti Nofaris. "Optical properties and photocatalytic activity of CdS-TiO2/graphite composite." Science and Engineering of Composite Materials 24, no. 2 (2017): 253–60. http://dx.doi.org/10.1515/secm-2015-0162.

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AbstractTiO2 film was applied to graphite substrate through chemical bath deposition (CBD) method with TiCl4 as precursor. CdS was deposited on TiO2/graphite (TiO2/G) by CBD with precursors of CdSO4. A UV-Vis diffuse reflectance (UV-Vis DR) analysis was used to analyze the optical properties and band gap energy. Meanwhile, photocatalytic activity was determined from the quantum yield (QY) value of isopropanol degradation. The X-ray diffraction pattern shows that the TiO2 film contains rutile and anatase phases. UV-Vis DR spectrum shows the photoactivity in the visible light area and provides l

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10

Guan, Hao Yuan, Xiao Cheng Yang, Sheng Ming Jin, and Min Yang. "Synthesis and Catalytic Activity of Composite Materials TiO₂/Ti-Al-MCM-41 by Chemical Vapor Deposition (CVD)." Advanced Materials Research 97-101 (March 2010): 1749–53. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1749.

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TiO2/Ti-Al-MCM-41 (TAM) with high Ti content (Si/Ti=6.2) was prepared by chemical vapor deposition (CVD) of TiCl4 on Al-MCM-41 at low reaction temperature (423 K). The sample was characterized by X-ray diffraction (XRD), N2 adsorption/desorption, high resolution transmission electron microscopy (HRTEM) and diffuse reflectance ultraviolet-visible spectroscopy (DR UV-vis). The results showed that Ti atoms were in tetrahedral coordinated in the framework of Al-MCM-41. Meanwhile, higher Ti4+ ions coordination and bulk anatase titania was observed in the DR UV-vis spectra. TAM still exhibited hexag

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11

Bochkova, Olga, Mikhail Khrizanforov, Aidar Gubaidullin, et al. "Synthetic Tuning of CoII-Doped Silica Nanoarchitecture Towards Electrochemical Sensing Ability." Nanomaterials 10, no. 7 (2020): 1338. http://dx.doi.org/10.3390/nano10071338.

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The present work introduces both synthesis of silica nanoparticles doped with CoII ions by means of differently modified microemulsion water-in-oil (w/o) and Stöber techniques and characterization of the hybrid nanoparticles (CoII@SiO2) by TEM, DLS, XRD, ICP-EOS, SAXS, UV-Vis, and UV-Vis/DR spectroscopy and electrochemical methods. The results reveal the lack of nanocrystalline dopants inside the hybrid nanoparticles, as well as no ligands, when CoII ions are added to the synthetic mixtures as CoII(bpy)3 complexes, thus pointing to coordination of CoII ions with Si-O- groups as main driving fo

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12

Bach-Toledo, Larissa, Patricio G. Peralta-Zamora, and Liziê Daniela Tentler Prola. "Ag-TiO2 Nanocomposites: Visible Or Solar Light Driven Plasmonic Photocatalysis?" Journal of Photocatalysis 2, no. 4 (2021): 306–13. http://dx.doi.org/10.2174/2665976x02666211027120324.

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Background: The demand for photocatalytic processes assisted by solar radiation has stimulated the upgrading of established systems, as the semiconductor modification with noble metals. Objective: the synthesis, characterization, and photocatalytic activity evaluation of the Ag-TiO2, against sulfamethoxazole molecule, and investigate the significance of the plasmonic phenomenon in Visible (450 - 1000nm) and UV-Vis (315-800 nm) radiation. Methods: Different nanocomposites Ag/TiO2 ratios were synthesized by the deposition of Ag nanoparticles on the TiO2 surface by in-situ photoreduction, and the

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13

Bielan, Zuzanna, Szymon Dudziak, Agnieszka Sulowska, Daniel Pelczarski, Jacek Ryl, and Anna Zielińska-Jurek. "Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation." Materials 13, no. 12 (2020): 2763. http://dx.doi.org/10.3390/ma13122763.

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Among various methods of improving visible light activity of titanium(IV) oxide, the formation of defects and vacancies (both oxygen and titanium) in the crystal structure of TiO2 is an easy and relatively cheap alternative to improve the photocatalytic activity. In the presented work, visible light active defective TiO2 was obtained by the hydrothermal reaction in the presence of three different oxidizing agents: HIO3, H2O2, and HNO3. Further study on the effect of used oxidant and calcination temperature on the physicochemical and photocatalytic properties of defective TiO2 was performed. Ob

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14

Du, Pham Dinh, Nguyen Trung Hieu, and Tran Vinh Thien. "Ultrasound-Assisted Rapid ZIF-8 Synthesis, Porous ZnO Preparation by Heating ZIF-8, and Their Photocatalytic Activity." Journal of Nanomaterials 2021 (July 1, 2021): 1–12. http://dx.doi.org/10.1155/2021/9988998.

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Zeolitic imidazolate framework-8 (ZIF-8) is synthesized quickly at room temperature in methanol with the support of ultrasound. Porous ZnO is also prepared via the thermal treatment of ZIF-8. The photocatalytic activities of the obtained materials are demonstrated via methylene blue (MB) decomposition under UV radiation. The obtained materials are characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherms, UV-Vis diffuse reflectance spectra (DR-UV-Vis), and photoluminescence sp

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15

Dosa, Melodj, Marco Piumetti, Samir Bensaid, et al. "Photocatalytic Abatement of Volatile Organic Compounds by TiO2 Nanoparticles Doped with Either Phosphorous or Zirconium." Materials 12, no. 13 (2019): 2121. http://dx.doi.org/10.3390/ma12132121.

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The aim of this work is to study the activity of novel TiO2-based photocatalysts doped with either phosphorus or zirconium under a UV-Vis source. A set of mesoporous catalysts was prepared by the direct synthesis: TiO2_A and TiO2_B (titanium oxide synthesized by two different procedures), P-TiO2 and Zr-TiO2 (binary oxides with either nonmetal or metal into the TiO2 framework). Complementary characterizations (N2 physisorption at 77 K, X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) analysis, X-ray Photoelectron Spectroscopy (XP

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16

Kowalkińska, Marta, Jakub Karczewski, and Anna Zielińska-Jurek. "The Effect of Titanium Oxyfluoride Morphology on Photocatalytic Activity of Fluorine-Doped Titanium(IV) Oxide." Crystals 13, no. 2 (2023): 356. http://dx.doi.org/10.3390/cryst13020356.

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Titanium oxyfluoride (TiOF2) is a metastable product that can be obtained in a fluorine-rich environment. This material can also be a valuable precursor in the synthesis of titanium(IV) oxide (TiO2). However, the effect of TiOF2 morphology on the physicochemical properties of TiO2 has not been studied so far. In this work, single-phase TiOF2 was prepared by a solvothermal method. The as-synthesized samples exhibited a variety of morphologies, including different shapes and crystallite sizes. These materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) combi

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17

Moussa, N., and A. Ghorbel. "UV–vis–DR study of VOx/SiO2 catalysts prepared by sol–gel method." Applied Surface Science 255, no. 5 (2008): 2270–75. http://dx.doi.org/10.1016/j.apsusc.2008.07.104.

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18

Saxena, Chitrlekha, and Gajendragadkar M. P. "Comparative Study and Quantitative Analysis of Stachydrine in Alfalfa Mother Tincture Prepared from Different Homoeopathic Pharmaceutical Companies." International Journal of Membrane Science and Technology 10, no. 1 (2023): 517–23. http://dx.doi.org/10.15379/ijmst.v10i1.2615.

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Background: Stachydrine has been identified as the major alkaloid in alfalfa and it is positively correlated with protein contents. More stachydrine was present in leaves than in the stems of plants. Alkaloid was ascertained by using Mayer’s reagent and Isatin reagent. Uv-vis spectrophotometer is an apparatus used to encounter specific absorbance such Alkaloids, Phenols, etc. in the given samples quartz cuvette is utilized for the sample scrutiny. Aim: To compare Stachydrine content in Alfalfa mother tincture prepared from different Homoeopathic Pharmaceutical Companies. Methods: 1ml of Alfalf

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19

Boonprakob, Natkritta, Natda Wetchakun, Sukon Phanichphant, Jun Chen, and Burapat Inceesungvorn. "N-Loaded TiO₂ for Photocatalytic Degradation of Methyl Orange under Visible Light Irradiation." Advanced Materials Research 622-623 (December 2012): 883–88. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.883.

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Nitrogen-loaded TiO2(N-loaded TiO2), a visible-light driven catalyst, was successfully synthesized by the modified sol-gel method. Physical characterizations of the as-prepared catalysts have been performed by using X-ray diffraction (XRD), Diffuse reflectance UVvisspectroscopy(DRUVvis), Raman spectroscopyand BETspecific surface areain order to obtain structure-activity relationship. Results from Raman spectroscopy clearly suggested that N atoms were incorporated into the TiO2crystal lattice as evidenced by the vibrational peak of TiN in TiO2-xNx.DR UVvis results also suggested that the ni

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Bowornhathai, Thipchanok, Potjanart Suwanruji, Jantip Setthayanond, Sutasinee Kityakarn, and Supakit Achiwawanich. "Synthesis of Three-Dimensionally Ordered Macroporous (3DOM) TiO₂: Photodegradation Catalyst." Key Engineering Materials 735 (May 2017): 132–35. http://dx.doi.org/10.4028/www.scientific.net/kem.735.132.

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Three-dimensionally ordered macroporous (3DOM) TiO2 were successfully synthesized by incorporating colloidal crystal template and sol-gel method using titanium isopropoxide and ethanol as precursors. After calcination at 450°C, the synthesized photocatalyst was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and diffuse reflectance UV-VIS spectroscopy (DR/UV-VIS). XRD results indicated that only anatase was presented. SEM images illustrated highly ordered macroporous structure which was a characteristic for 3DOM materials. The band gap energy of 3DOM TiO2 and nanop

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Pham DInh, Du, and Nghi Nguyen Huu. "Preparation and photocatalytic activities for decomposition of methylene blue of zeolitic imidazolate framework-8." Vietnam Journal of Catalysis and Adsorption 9, no. 2 (2020): 94–99. http://dx.doi.org/10.51316/jca.2020.035.

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In the present study, zeolitic imidazolate framework-8 (ZIF-8) is synthesized quickly in methanol solvent with the support of ultrasound, and application of photocatalyst for methylene blue (MB) decomposition reaction under UV radiation. The obtained ZIF-8 was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and UV-Vis diffuse reflectance spectra (DR-UV-Vis). The influence pH and kinetics of photocatalytic MB decomposition and reusability of ZIF-8, were also investigated. The results indicated that ZIF-8 could work effectively in the wide pH range f

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22

Dinh Du, Pham, Huynh Thanh Danh, Pham Ngoc Hoai, Nguyen Mau Thanh, Vo Thang Nguyen, and Dinh Quang Khieu. "Heterogeneous UV/Fenton-Like Degradation of Methyl Orange Using Iron Terephthalate MIL-53 Catalyst." Journal of Chemistry 2020 (June 12, 2020): 1–13. http://dx.doi.org/10.1155/2020/1474357.

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The synthesis and degradation of methyl orange (MO) in an ultraviolet-assisted heterogeneous Fenton-like process via the iron terephthalate (MIL-53) catalyst are demonstrated. MIL-53 material was characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectra (DR-UV-Vis), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms. It was found that the obtained material shares an identical pattern of the MIL-53 structure with high crystallinity and also demonstra

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23

Hermawan, Prasetyo, Harno Dwi Pranowo, and Indriana Kartini. "PHYSICAL CHARACTERIZATION OF Ni(II) DOPED TiO₂ NANOCRYSTAL BY SOL-GEL PROCESS." Indonesian Journal of Chemistry 11, no. 2 (2011): 135–39. http://dx.doi.org/10.22146/ijc.21400.

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Ni(II) doped titanium dioxide has been prepared by using sol-gel process. Ni(II) ion was incorporated into titanium dioxide by reacting Ni(II) chloride with titanium tetraisopropoxide (TTiP)-acetyl acetone mixture in isopropanol solvent. The effects of transition metal ion doping on the physical properties have been investigated. UV/Vis spectrophotometer, TGA-DTA, X-ray diffraction (XRD) and DR-UV/Vis were used to investigate the spectra absorption of nanosol, nanoparticle thermal transition, structure of crystal and band edge absorption, respectively. The results at addition of 5% Ni/Ti revea

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Guerra-Que, Zenaida, Jorge Cortez-Elizalde, Hermicenda Pérez-Vidal та ін. "Bimetallic M–Cu (M = Ag, Au, Ni) Nanoparticles Supported on γAl2O3-CeO2 Synthesized by a Redox Method Applied in Wet Oxidation of Phenol in Aqueous Solution and Petroleum Refinery Wastewater". Nanomaterials 11, № 10 (2021): 2570. http://dx.doi.org/10.3390/nano11102570.

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Three bimetallic catalysts of the type M–Cu with M = Ag, Au and Ni supports were successfully prepared by a two-step synthesized method using Cu/Al2O3-CeO2 as the base monometallic catalyst. The nanocatalysts were characterized using X-ray diffraction (XRD), temperature-programmed reduction of H2 (H2-TPR), N2 adsorption-desorption, scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and ultraviolet–visible spectroscopy with diffuse reflectance (DR-UV-Vis) techniques. This synthesized methodology allowed a close interaction

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Elamathi, P., Murali Krishna Kolli, and G. Chandrasekar. "Catalytic Oxidation of Vanillyl Alcohol Using FeMCM-41 Nanoporous Tubular Reactor." International Journal of Nanoscience 17, no. 01n02 (2017): 1760010. http://dx.doi.org/10.1142/s0219581x17600109.

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Iron containing nanoporous MCM-41 (FeMCM-41) with different Si/Fe ratios of 50, 100 and 150 was synthesized by hydrothermal synthesis process. The materials obtained from hydrothermal synthesis were characterized by various physico chemical techniques such as XRD, N2 adsorption, DR UV-vis, EPR and FTIR spectroscopy. XRD analyses of FeMCM-41 materials confirmed the presence of well-ordered crystalline structure. N2 isotherm of FeMCM-41 materials showed type IV adsorption isotherm. EPR and DR UV-vis analysis of FeMCM-41 samples indicates the presence of high tetrahedral coordination at the Si/Fe

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Mohd Zaid, Hayyiratul Fatimah, Chong Fai Kait, and Mohamed Ibrahim Abdul Mutalib. "Photo Oxidative Extractive Desulfurization of Model Oil Using Fe/TiO₂ Photocatalyst and Eutectic Based Ionic Liquid: Effect of Metal Loading." Advanced Materials Research 1133 (January 2016): 664–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.664.

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Titanium dioxide (TiO2) photocatalyts doped with iron metal at different metal loadings were successfully prepared and characterized. The doped photocatalyst were characterized using diffuse reflectance spectroscopy (DR-UV-Vis), X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM).Photooxidative extractive desulfurization of model oil containing dibenzothiophene as the sulfur compound (100ppm) was investigated using the prepared photocatalyst. The photocatalyst with 0.20 wt% Fe metal loading showed the best sulfur removal at 61.13%.

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Bulánek, Roman, Pavel Čičmanec, and Michal Setnička. "Possibility of VOx/SiO2 Complexes Speciation: Comparative Multi-wavelength Raman and DR UV-vis Study." Physics Procedia 44 (2013): 195–205. http://dx.doi.org/10.1016/j.phpro.2013.04.024.

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Tavella, Francesco, Claudio Ampelli, Salvatore Leonardi, and Giovanni Neri. "Photo-Electrochemical Sensing of Dopamine by a Novel Porous TiO2 Array-Modified Screen-Printed Ti Electrode." Sensors 18, no. 10 (2018): 3566. http://dx.doi.org/10.3390/s18103566.

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In this paper, the development of a nanoporous TiO2 array-modified Ti electrode for photo-electrochemical (PEC) sensing of dopamine (DA) is reported. A porous TiO2 array-modified electrode was fabricated from the controlled anodic oxidation of a Ti working electrode of commercial screen-printed electrodes (SPE). The anodization process and the related morphological and microstructural transformation of the bare Ti electrode into a TiO2/Ti electrode was followed by scanning electron microscopy (SEM) and UV-visible reflectance spectroscopy (DR-UV-Vis). The modified electrode was irradiated with

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Dulian, Piotr, Marlena Buras, and Witold Żukowski. "Modyfication of photocatalytic properties of titanium dioxide by mechanochemical method." Polish Journal of Chemical Technology 18, no. 3 (2016): 68–71. http://dx.doi.org/10.1515/pjct-2016-0061.

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Abstract The paper presents a simple way to improve the photocatalytic properties of titanium dioxide using mechanochemical method. The TiO2 (Anatase) powders was subjected to high-energy ball milling in dry environment and in methanol. It has been shown that it is possible to induce the phase transformation from Anatase to Rutile and produce a material with a higher photocatalytic activity in the UV light. Physicochemical characteristics of the products were based on the following methods and techniques: X-ray powder diffraction (XRD), IR and UV-Vis (DR) spectroscopy, measurements of specific

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Yang, Bo, Yue Xiang Li, and Jiao Song. "Indirect anodic oxidation applied for treatment of simulated wastewater containing Cationic Red X-GRL and Disperse Red 3B." Journal of Water Reuse and Desalination 7, no. 2 (2016): 197–204. http://dx.doi.org/10.2166/wrd.2016.213.

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The treatment of simulated wastewater containing Cationic Red X-GRL (X-GRL) or Disperse Red 3B (DR-3B) dye was carried out by indirect anodic oxidation, using Ti/SnO2 electrodes as the anode. The influences of pH value, voltage, electrolysis time and sodium chloride dosage on the degradation performance were studied by single factor experiment. Furthermore the nitrogen states and UV-Vis spectra in dyes degradation were analyzed. The results showed that under the optimum condition (pH = 3, voltage = 20 V, NaCl = 2.5 g/L), the decolorization and chemical oxygen demand removal of X-GRL were 98% a

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Bertone, E., A. Venturello, R. Leardi, and F. Geobaldo. "Prediction of the optimum harvest time of ‘Scarlet’ apples using DR-UV–Vis and NIR spectroscopy." Postharvest Biology and Technology 69 (July 2012): 15–23. http://dx.doi.org/10.1016/j.postharvbio.2012.02.009.

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Rohayati, Zaina, Eko Sri Kunarti, and Bambang Rusdiarso. "Synthesis of Magnetically Separable Fe<sub>3</sub>O<sub>4</sub>/TiO<sub>2</sub>-Ag with Enhanced Photocatalytic Performance under Visible Light for Degradation of Metanil Yellow." Key Engineering Materials 949 (July 26, 2023): 131–42. http://dx.doi.org/10.4028/p-awq1lx.

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Synthesis of magnetic photocatalyst, Fe3O4/TiO2-Ag, with characterization and photoactivity examination have been investigated. The synthesis was initiated by preparation of Fe3O4 particles using coprecipitation method. The Fe3O4 particles were then coated with TiO2-Ag, weight ratios of concentrations Silver dopant were varied from 1 to 3, 5 and 7 wt%. The Fe3O4/TiO2-Ag was characterized by FTIR, XRD, TEM, SEM-EDX, DR UV-visible and VSM methods. The degradation of metanil yellow solution was performed under exposure to UV, visible light and dark condition at optimum condition. The Fe3O4 and an

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Situmeang, Rudy, Romiyati Romiyati, Suripto Dwi Yuwono, Posman Manurung, Iqbal Firdaus, and Simon Sembiring. "The effect of vanadium addition in Ni_1-xV_xFe₂O₄ nano photocatalysts on remazol golden yellow degradation under visible light irradiation." Advances in Natural Sciences: Nanoscience and Nanotechnology 13, no. 3 (2022): 035014. http://dx.doi.org/10.1088/2043-6262/ac8d8f.

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Abstract Photocatalysis is a promising solution for the degradation of dyes since this substance harms the environment. In addition, this process is environmentally friendly, especially while using low energy through visible light irradiation. In this study, Ni1-xVxFe2O4 nano-photocatalyst has been prepared using the sol-gel method. After freeze-drying and calcination processes, the sample was characterised using the techniques of x-ray diffraction (XRD), FTIR, UV–vis DR spectroscopy, TEM, and Particle Size Analyser (PSA). The XRD results indicated that a majority of the crystalline phase in t

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Stanciulescu, Dorina, Gabriela Carja, and Doina Lutic. "Fabrication of Zinc-Iron-Aluminum Layered Double Hydroxides with Controlled Micromorphology in a Tailored Aqueous - Organic Synthesis Medium." Revista de Chimie 71, no. 7 (2020): 137–44. http://dx.doi.org/10.37358/rc.20.7.8231.

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Micromorphology characteristics of layered double hydroxides are important to establish their performances to act as adsorbents and catalysts/photocatalysts. Herein, we report the fabrication of ZnFeAl layered double hydroxides (LDHs) (defined by a molar ratios Zn/Fe/Al 2/0.5/0.5), in a tailored aqueous-organic synthesis medium, by using the coprecipitation method. The nature of the organic solvent (e.g.: ethanol, ethyl acetate, glycerol and toluene) was used as a controlled variable for obtaining specific morphology characteristics of ZnFeAl. XRD, FTIR, UV-Vis-DR spectroscopy and SEM microsco

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Rollando, Rollando, та Muhammad Hilmi Afthoni. "METODE ISOLASI YANG MUDAH DALAM ISOLASI SENYAWA β-KAROTEN DARI LABU KUNING (Cucurbita moschata Duch ex Poiret)". JIFFK : Jurnal Ilmu Farmasi dan Farmasi Klinik 16, № 01 (2019): 15. http://dx.doi.org/10.31942/jiffk.v16i01.2924.

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ABSTRACTPumpkin (Cucurbita moschata Duch ex Poiret), a fruit that contains several compounds, has activities to protect the human body from free radicals. Provitamin A is recognized as an antioxidant compound. Antioxidants can protect the body’s damage caused by free radicals. The purpose of this study was to isolate beta carotene compounds and test the purity of beta carotene isolates obtained using DR-UV and infrared spectrophotometry. Pumpkin is extracted using acetone: petroleum ether with a ratio (1: 1). Identification of beta carotene from extracts was carried out using TLC with the mobi

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Vu, Anh-Tuan, Thi Anh Tuyet Pham, Xuan Truong Do, et al. "Preparation of Hierarchical Structure Au/ZnO Composite for Enhanced Photocatalytic Performance: Characterization, Effects of Reaction Parameters, and Oxidizing Agent Investigations." Adsorption Science & Technology 2021 (November 18, 2021): 1–19. http://dx.doi.org/10.1155/2021/5201497.

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Zinc oxide (ZnO) has been shown as a potential photocatalyst under ultraviolet (UV) light but its catalytic activity has a limitation under visible (Vis) light due to the wide bandgap energy and the rapid recombination of electrons and holes. Thus, hierarchical structure Au/ZnO composites were fabricated by the hydrothermal method and chemical reduction method for enhanced photocatalytic performance under visible light. As-prepared composites were characterized by UV-vis diffuse reflectance spectra (DR/UV-Vis), field emission scanning electron microscope (FESEM), energy-dispersive X-ray spectr

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Coelho, Ana C., P. Brandão, António M. dos Santos, João Rocha, and Isabel S. Gonçalves. "Immobilisation of Ferricinium Cation into ETS-10 by Ion Exchange under Microwave Irradiation." Materials Science Forum 587-588 (June 2008): 453–57. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.453.

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The microporous titanosilicate ETS-10 was subjected to three cycles of ferricinium ion ([(η5-C5H5)2Fe]+, Fc+) exchange by using aqueous solutions of ferricinium hexafluorophosphate and microwave-assisted heating. The resultant hybrid inorganic-organometallic (ETS-10/Fc+) materials were characterised by elemental analysis, ICP-AES, FTIR and Raman spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance (DR) UV-Vis, 29Si and 23Na solid-state NMR. The results support the successful inclusion of Fc+ in the pores of the inorganic host by ion exchange of

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Lu, Ying, Chang Lu Shao, Peng Zhang, et al. "Characterizations and Crystal Structure of Metallic Ion Doped Titania Nanofiber by Sol-Gel Method." Advanced Materials Research 306-307 (August 2011): 1330–33. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1330.

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A simple and novel method to synthesize metallic ion doped titania was investigated. In this work, undoped titania, stannum/titania, vanadium/titania and strontium/titania nanofibers have been fabricated by a sol-gel method with electrospinning techniques. The as-prepared composite nanofibers were incinerated at 500 °C respectively. The nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-vis diffuse reflectance (DR) spectroscopy. The results suggest that crystal structures of stannum/titania, vanadium/titania and strontium/titania composite nano

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Anjani, Marshela, Fendi Yoga Wardana, Nanang Ardianto, and Maria Istiqomah. "UJI AKTIVITAS ANTIOKSIDAN DAN PENENTUAN NILAI SUN PROTECTION FACTOR (SPF) DARI FRAKSI DAUN VIOLET (Viola odorata L.)." JURNAL RISET KESEHATAN POLTEKKES DEPKES BANDUNG 16, no. 2 (2024): 485–95. http://dx.doi.org/10.34011/juriskesbdg.v16i2.2494.

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Paparan radiasi sinar UV dalam waktu lama dapat memicu efek berbahaya pada kulit manusia, seperti kerutan dan kanker kulit. Dampak buruk tersebut dapat diminimalisir dengan penggunaan tabir surya sebagai pelindung sinar UV. Daun violet (Viola odorata L.) mempunyai kandungan senyawa flavonoid yang berpotensi sebagai antioksidan sekaligus zat aktif tabir surya. Tujuan penelitian ini adalah untuk mengetahui aktivitas antioksidan dan mengukur nilai Sun Protection Factor (SPF) pada fraksi daun violet (Viola odorata L.). Penelitian ini dilakukan di Laboratorium Farmakognosi dan Kimia ITSK RS dr. Soe

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Li, Xue Feng, and Shao Xian Peng. "Poly(Acrylic Acid)-Ferric Hydroxide Photosensitive Self-Assembly Film." Materials Science Forum 663-665 (November 2010): 252–55. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.252.

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A stable and high lubricant ultrathin film was fabricated by self-assembled procedure at room temperature. Thickness of the films was regularly increased with the layer-by-layer self-assembly process in which poly (acrylic acid)-ferric hydroxide (PAA-Fe(OH)3) sol as anion polyelectrolyte and photosensitive diazoresin (DR) as cationic polyelectrolyte. And the process which based on electrostatic attraction was verified by UV-vis measurement. Furthermore, the ionic bonds in the films converted to covalent bonds under UV irradiation. Finally, the surface morphology and microtribology of the films

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Jabłońska, Magdalena, Kinga Góra-Marek, Miha Grilc, et al. "Effect of Textural Properties and Presence of Co-Cation on NH3-SCR Activity of Cu-Exchanged ZSM-5." Catalysts 11, no. 7 (2021): 843. http://dx.doi.org/10.3390/catal11070843.

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Comparative studies over micro-/mesoporous Cu-containing zeolites ZSM-5 prepared by top-down treatment involving NaOH, TPAOH or mixture of NaOH/TPAOH (tetrapropylammonium hydroxide) were conducted. The results of the catalytic data revealed the highest activity of the Cu-ZSM-5 catalyst both in the absence and presence of water vapor. The physico-chemical characterization (diffuse reflectance UV-Vis (DR UV-Vis), Fourier transform infrared (FT-IR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, temperature-programmed desorption of NOx (TPD-NOx), and microkinetic modeling) resul

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Alnassar, Muhmmed Ali, Abdulmohsen Alshehri, and Katabathini Narasimharao. "Visible Light Active Magnesium Silicate–Graphitic Carbon Nitride Nanocomposites for Methylene Blue Degradation and Pb2+ Adsorption." Catalysts 12, no. 10 (2022): 1256. http://dx.doi.org/10.3390/catal12101256.

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Magnesium silicate nanosheets (MgSiNS) and graphitic carbon nitride (g-C3N4) nanocomposites were produced by varying different weight percentages of g-C3N4. The obtained nanocomposites were characterized by various techniques such as X-Ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), diffuse reflectance UV–vis spectroscopy (DR UV–vis), N2-physisorption, transmission electron microscopy (TEM), and X-ray photon spectroscopy (XPS). The photocatalytic activities of the nanocomposites were measured using visible light irradiation to degrade methylene blue (MB) and Pb2+ adso

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Matmin, Juan, Mohamad Azani Jalani, Hazwanee Osman, et al. "Photochemical Synthesis of Nanosheet Tin Di/Sulfide with Sunlight Response on Water Pollutant Degradation." Nanomaterials 9, no. 2 (2019): 264. http://dx.doi.org/10.3390/nano9020264.

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The photochemical synthesis of two-dimensional (2D) nanostructured from semiconductor materials is unique and challenging. We report, for the first time, the photochemical synthesis of 2D tin di/sulfide (PS-SnS2-x, x = 0 or 1) from thioacetamide (TAA) and tin (IV) chloride in an aqueous system. The synthesized PS-SnS2-x were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), a particle size distribution analyzer, X-ray photoelectron spectroscopy (XPS), Fourier-transfo

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Mancuso, Antonietta, Nicola Blangetti, Olga Sacco, et al. "Photocatalytic Degradation of Crystal Violet dye under Visible Light by Fe-Doped TiO2 Prepared by Reverse-Micelle Sol–Gel Method." Nanomaterials 13, no. 2 (2023): 270. http://dx.doi.org/10.3390/nano13020270.

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A reverse-micelle sol–gel method was chosen for the preparation of Fe-doped TiO2 samples that were employed in the photodegradation of the crystal violet dye under visible light irradiation in a batch reactor. The dopant amount was varied to assess the optimal photocatalyst composition towards the target dye degradation. The photocatalysts were characterized through a multi-technique approach, envisaging XRPD and QPA as obtained by Rietveld refinement, FE-SEM analysis, DR UV−vis spectroscopy, N2 adsorption/desorption isotherms measurement at −196 °C, ζ-potential measurement, and XPS analysis.

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Gianotti, Enrica, Valeria Dellarocca, Leonardo Marchese, Gianmario Martra, Salvatore Coluccia, and Thomas Maschmeyer. "NH3adsorption on MCM-41 and Ti-grafted MCM-41. FTIR, DR UV–Vis–NIR and photoluminescence studies." Phys. Chem. Chem. Phys. 4, no. 24 (2002): 6109–15. http://dx.doi.org/10.1039/b207231a.

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Dzwigaj, Stanislaw, Yannick Millot, Christophe Méthivier, and Michel Che. "Incorporation of Nb(V) into BEA zeolite investigated by XRD, NMR, IR, DR UV–vis, and XPS." Microporous and Mesoporous Materials 130, no. 1-3 (2010): 162–66. http://dx.doi.org/10.1016/j.micromeso.2009.10.027.

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Andas, Jeyashelly, and Nor Wahida Subri. "Silica Rice Husk Supported Ag/ZnO Nanoparticles for an Improved Visible-Light Photocatalytic of Methylene Blue." Applied Mechanics and Materials 835 (May 2016): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.835.3.

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Nanostructure ZnO and Ag/ZnO were successfully synthesized from rice husk via an eco-friendly sol-gel method. Structural investigations by FT-IR and DR/UV-Vis analyses confirmed the successful inclusion of metal species into the silica framework. XRD and TEM studies evidenced the well-dispersion of silver and zinc onto the silica support. Modification of ZnO with Ag resulted in the maximum photocatalytic activity (90.5 %) of methylene blue, (40 mgL-1) under compact fluorescent lamp irradiation. Minimal agglomeration, high dispersion and narrow band gap energy of Ag/ZnO was suggested to contrib

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Muttaqin, Afdhal. "PENENTUAN KADAR GULA DARAH PADA PENDERITA DIABETES MELLITUS (DM) MELALUI UJI SPEKTROSKOPI ASETON DALAM AIR LIUR." JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS 4, no. 1 (2012): 8–13. http://dx.doi.org/10.25077/jif.4.1.8-13.2012.

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Telah dilakukan penelitian untuk menetukan hubungan antara kadar aseton dalam air liur dengan kadar gula darah pada penderita diabetes mellitus (DM). Sampel terdiri dari dua kelompok, lima orang tanpa keluhan DM dan lima orang pasien DM dari RSUP Dr. M. Djamil Padang. Pengambilan air liur dan pengukuran gula darah dilakukan bersamaan pada dua waktu, dua jam setelah makan dan setelah berpuasa selama dua belas jam. Semua sampel air liur dispektroskopi dengan spektrofotometer UV-Vis menggunakan lampu xenon sebagai sumber cahaya. Hasil penelitian menunjukkan bahwa terdapat korelasi tinggi antara k

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Cicogna, Francesca, Guido Giachi, Luca Rosi, et al. "Macromolecular Dyes by Chromophore-Initiated Ring Opening Polymerization of L-Lactide." Polymers 12, no. 9 (2020): 1979. http://dx.doi.org/10.3390/polym12091979.

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End functionalized polylactides are prepared by ring opening polymerization of L-lactide in the presence of stannous octoate (Sn(Oct)2). Three chromophores, 9H-carbazol-ethanol (CA), 9-fluorenyl-methanol (FM), and 2-(4-(2-chloro-4-nitrophenylazo)-N-ethylphenylamino)ethanol (Disperse Red 13, DR), are for the first time used as co-initiators in the polymerization process. The polymerization reaction is initiated by conventional thermal treatment, but in the case of FM, microwave-assisted polymerization is also carried out. CA and FM absorb and emit in the UV portion of the electromagnetic spectr

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Setyawati, Dessy Ayu, and Abdul Haris. "Sintesis ZnO-SiO2 serta Aplikasinya pada Degradasi Limbah Organik Fenol dan Fotoreduksi Pb(II) secara Simultan." Jurnal Kimia Sains dan Aplikasi 18, no. 3 (2015): 96–100. http://dx.doi.org/10.14710/jksa.18.3.96-100.

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Telah berhasil disintesis ZnO-SiO2 dengan metode sol-gel sebagai fotokatalisis pada degradasi limbah organik fenol dan fotoreduksi kadar Pb(II) secara simultan. Tujuan penelitian ini adalah untuk mensintesis dan mengkarakterisasi fotokatalis ZnO-SiO2 serta uji aktivitasnya dalam proses degradasi larutan campuran fenol dan reduksi Pb(II). Tahapan penelitian meliputi sintesis ZnO-SiO2, karakterisasi ZnO-SiO2 dan uji aktivitas. Hasil karakterisasi ZnO-SiO2 dengan XRD menunjukkan bahwa ZnO yang digunakan memiliki struktur kristal wurtzite dengan ukuran kristal 25,99 nm sedangkan untuk hasil karakt

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