scholarly journals Influence of Calcination Temperature on Size, Morphology and Optical Properties of ZNO/C Composite Synthesized by a Colloidal Method

2021 ◽  
Vol 21 (3) ◽  
pp. 537
Author(s):  
Siham Lhimr ◽  
Saidati Bouhlassa ◽  
Bouchaib Ammary
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Calcination Temperature ◽  
Diffuse Reflectance ◽  
Fourier Transforms ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
X Ray

ZnO is one of the most studied semiconductor materials because of its interesting chemicals, and from a technological point of view, mainly as a consequence of their outstanding properties, such as wurtzite type, non-toxic nature, large band gap, low cost, and environment-friendly. In this work, the ZnO/C composite was synthesized by a simple and fast low-temperature method; the solid product was calcination temperature at 100 to 400 °C. The influence of variation in calcination temperature was studied using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and UV-visible diffuse reflectance spectroscopy. The X-ray diffraction patterns indicated a high crystallinity and a nanocrystalline size of the ZnO/C composite hexagonal structure of wurtzite. The SEM image of the samples showed that the powder has a spherical structure of flakes aggregated in the common nucleus like a grid. The sphere consists of spindle and flower-like structures. The optical properties were determined by UV-vis diffuse reflectance spectroscopy, and it was found that the band gap energy of ZnO/C composite increase from 3.210 to 3.329 eV with an increase in calcination temperature from 100 to 400 °C. FTIR spectra and EDS analysis showed that the existence of carbon in the composite.

Effect of Calcination Temperature on the Photocatalytic Activity of Spiel Zn2SnO4

2012 ◽  
Vol 476-478 ◽  
pp. 1882-1888
Author(s):  
Ke Lei Zhang ◽  
Rui Jie Zhao ◽  
Qian Kun Lei ◽  
Yan Chun Hu
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Activity Measurement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fine Adjustment ◽  
Scanning Electron

Spinel Zn2SnO4 photocatalysts have been prepared by the solid state reaction. as-prepared samples were characterized by power X-ray diffraction, scanning electron microscope, UV-vis diffuse reflectance spectroscopy and photocatalytic activity measurement. The results show that the reaction temperature have significant effects on the Zn2SnO4 photocatalytic activity . It has also been found that the distribution of the cations in Zn2SnO4 crystal lattice changes with the increase of calcination temperature, causing the local structural fine adjustment that associated with the photocatalytic properties.

scholarly journals PENGOLAHAN LIMBAH Cr(VI) DAN FENOL DENGAN FOTOKATALIS SERBUK TiO2 DAN CuO/TiO2

REAKTOR ◽  
2007 ◽  
Vol 11 (2) ◽  
pp. 78 ◽  
Author(s):  
Slamet Slamet ◽  
R. Arbianti ◽  
E. Marliana
Keyword(s):  
Band Gap ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Black Light ◽  
Degussa P25

Studi tentang pengolahan limbah Cr(VI) dan fenol secara fotokatalisis telah dilakukan dengan fotokatalis TiO2 dan CuO/TiO2. Katalis CuO/TiO2 dipreparasi dengan cara impregnasi terhadap TiO2 Degussa P25 menggunakan larutan garam tembaga yang berasal dari berbagai jenis prekursor. Komposisi Cu dalam katalis divariaskani dari 0,2% hingga 5%. Fotokatalis tersebut kemudian dikarakterisasi DRS (Diffuse Reflectance Spectroscopy) dan XRD (X-Ray Diffraction). Aktivitas fotokatalis diuji dengan menggunakan sistem reaktor slurry yang bekerja secara batch dan dilengkapi dengan 6 lampu UV black light selama 5 jam, kemudian hasilnya dianalisis dengan UV-VIS Spectrophotometer. Hasil karakterisasi DRS menunjukan bahwa penambahan CuO dari 1% hingga 5% ke dalam TiO2 dapat meningkatkan pita absorbansi katalis dari 398 hingga 413 nm dan menurunkan band gap dari 3,2 hingga 2,58 eV. Hasil karakterisasi XRD menunjukan adanya struktur kristal anatase dan rutil dalam katalis TiO2 dan CuO/TiO2, sementara struktur kristal CuO muncul pada katalis CuO/TiO2 yang dipreparasi dengan prekursor Cu-Asetat dan Cu-Nitrat. Fotokatalis 0,2% CuO/TiO2 dari prekursor Cu-Asetat memiliki aktivitas optimal yang mereduksi Cr(VI) 99,67% dan mendegradasi fenol 97,16%. Sementara jika kedua limbah tersebut diolah secara simultan, katalis TiO2 Degussa P25 memiliki aktivitas yang paling tinggi dengan meningkatkan konversi reduksi Cr(VI) menjadi 100% dan menurunkan konversi degradasi fenol menjadi 93,81% dengan waktu reaksi 5 jam.

Visible-Light-Induced Photocatalytic Activity of Boron-Doped BiVO4

2014 ◽  
Vol 809-810 ◽  
pp. 890-894
Author(s):  
Dan Li ◽  
Lian Wei Shan ◽  
Gui Lin Wang ◽  
Li Min Dong ◽  
Wei Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Reflectance Spectroscopy ◽  
Scheelite Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Boron Doped

Boron-BiVO4 samples were synthesized by sol-gel method. They were characterized by UV-vis diffuse reflectance spectroscopy, X-ray diffraction. Photocatalytic activity of the obtained BiVO4 samples was investigated through degrading methylene blue (MB). The results reveal that boron-BiVO4 catalysts have monoclinic scheelite structure. The BiVO4 and Co-BiVO4 photocatalysts were responsive to visible light. Co-BiVO4 photocatalyst showed higher photocatalytic activity than pure BiVO4, resulting in the significantly improved efficiency of degradation of MB.

Synthesis and Photocatalytic Properties of Flower-Like ZnIn2S4 Microspheres by a Solvothermal Method

2014 ◽  
Vol 881-883 ◽  
pp. 1101-1104 ◽  
Author(s):  
Min Jie Zhou ◽  
Peng Cui
Keyword(s):  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Diffuse Reflectance ◽  
Solvothermal Method ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In this work, flower-like ZnIn2S4 microspheres were synthesized using a solvothermal method. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and ultraviolet-visible diffuse reflectance spectroscopy (DRS) techniques. The photocatalytic activity of the ZnIn2S4 microspheres was investigated. The ZnIn2S4 microspheres exhibit much higher photocatalytic activity than pure P25 TiO2.

scholarly journals The nature and effects of rhodium and antimony dopants on the electronic structure of TiO2: towards design of Z-scheme photocatalysts

2016 ◽  
Vol 4 (18) ◽  
pp. 6946-6954 ◽  
Author(s):  
E. N. K. Glover ◽  
S. G. Ellington ◽  
G. Sankar ◽  
R. G. Palgrave
Keyword(s):  
Fine Structure ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Edge Structure ◽  
X Ray ◽  
Antimony Doping ◽  
X Ray Absorption

The nature and effects of rhodium and antimony doping in TiO2 have been investigated using X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Extended X-ray Absorption Fine Structure (EXAFS), X-ray Absorption Near Edge Structure (XANES) and diffuse reflectance spectroscopy.

Photo Oxidative Extractive Desulfurization of Model Oil Using Fe/TiO2 Photocatalyst and Eutectic Based Ionic Liquid: Effect of Metal Loading

2016 ◽  
Vol 1133 ◽  
pp. 664-668
Author(s):  
Hayyiratul Fatimah Mohd Zaid ◽  
Chong Fai Kait ◽  
Mohamed Ibrahim Abdul Mutalib
Keyword(s):  
Diffuse Reflectance ◽  
Sulfur Compound ◽  
Diffuse Reflectance Spectroscopy ◽  
Sulfur Removal ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Loading ◽  
Iron Metal ◽  
Model Oil

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%.

scholarly journals Design of Defect and Metallic Silver in Silver Phosphate Photocatalyst Using the Hydroxyapatite and Glucose

2020 ◽  
Vol 20 (6) ◽  
pp. 1441
Author(s):  
Uyi Sulaeman ◽  
Suhendar Suhendar ◽  
Hartiwi Diastuti ◽  
Roy Andreas ◽  
Shu Yin
Keyword(s):  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Glucose Solution ◽  
Reflectance Spectroscopy ◽  
Metallic Silver ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silver Phosphate ◽  
Agno3 Aqueous Solution

The defect and metallic silver (Ag) in silver phosphate (Ag3PO4) photocatalyst were successfully generated using hydroxyapatite (HA) and glucose. Two steps of synthesis were done in these experiments. Firstly, the Ag/HA powder was prepared by reacting AgNO3 and HA, followed by the addition of a glucose solution. Secondly, the suspension of Ag/HA was reacted with AgNO3 aqueous solution. The yellow product of Ag/Ag3PO4 photocatalyst was produced. The products were characterized using X-Ray Diffraction (XRD), Diffuse Reflectance Spectroscopy (DRS), Scanning Electron Microscope (SEM), Brunauer–Emmett–Teller (BET) and X-ray Photoelectron Spectroscopy (XPS). The decreased ratio of O/Ag and metallic Ag formation observed by the XPS was detected as the possible defect and Ag-doping in the photocatalyst. The enhanced photocatalytic activity might be caused by the oxygen vacancy and metallic Ag in Ag3PO4 that enables the separation of photo-generated electrons and holes.

scholarly journals Synthesis and photocatalytic activity of ZnO/CuO composite for the degradation of methyl blue under vilsible light iradiation

2020 ◽  
Vol 9 (3) ◽  
pp. 94-100
Author(s):  
Kim Nguyen Van ◽  
Nga Nguyen Thi Viet ◽  
Tuyen Vo Thi Thanh ◽  
Vien Vo
Keyword(s):  
Photocatalytic Activity ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Photogenerated Electron ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Microwave System ◽  
Direct Formation

Composite ZnO/CuO was prepared by direct formation of ZnO from Zn(OOCCH3)2 precursor in the presence of CuO with the assistant of the microwave system. The obtained composite was characterized by X-Ray Diffraction (XRD) and Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV-vis DRS), which shows that the composite with a bandgap of 3.27 eV contains two components, ZnO and CuO. The photocatalytic activity of ZnO/CuO was assessed by the degradation of methylene blue (MB) in water under visible light, shows that the photocatalytic activity for the ZnO/CuO composite was remarkably improved compared to single ZnO and CuO. This result is attributed to the reduced recombination rate of photogenerated electron-hole pairs by the presence of CuO in the composite, therefore photocatalysis activity increases.

scholarly journals Preparation, Characterization, and Activity of Y2O3-ZnO Complex Oxides for the Photodegradation of 2,4-Dinitrophenol

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Tong-ming Su ◽  
Zu-zeng Qin ◽  
Hong-bing Ji ◽  
Yue-xiu Jiang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Complex Oxides ◽  
Reflectance Spectroscopy ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Adsorption Selectivity ◽  
X Ray ◽  
Strong Adsorption

With strong adsorption selectivity and thermal stability, Y2O3was added to ZnO to obtain Y2O3-ZnO complex oxides by a precipitation method. The Y2O3-ZnO complex oxides were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, physisorption analyzer, and terephthalic acid photoluminescence probing techniques and were used for the degradation of 2,4-dinitrophenol. More hydroxyl radicals were generated on the surface of the ZnO after adding moderate Y2O3. The Y2O3-ZnO complex oxides which contained 0.50% Y2O3were proved to be the optimal photocatalyst and achieved a degradation of 81.2% of 2,4-dinitrophenol solution, compared to 57.6% achieved under the same photocatalytic conditions with ZnO alone.

Synthesis and photocatalytic performance of Bi2S3/SnS2 heterojunction

2017 ◽  
Vol 10 (02) ◽  
pp. 1750004 ◽  
Author(s):  
LiZhen Ren ◽  
DongEn Zhang ◽  
Xiao Yun Hao ◽  
Xin Xiao ◽  
Jun Yan Gong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Simulated Sunlight ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Bi2S3/SnS2 heterostructured photocatalysts were synthesized from BiOI, SnCl[Formula: see text]5H2O and NH2CSNH2 using an economic and simple hydrothermal method. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscopy and ultraviolet-visible diffuse reflectance spectroscopy. The photodegradation activities of the Bi2S3/SnS2 heterostructured photocatalysts were estimated by degrading rhodamine B under simulated sunlight supplied by irradiating with a 350[Formula: see text]W Xe lamp. Bi2S3/SnS2 photocatalysts were prepared using varying percentages of Bi2S3. The sample containing 13% Bi2S3 had the most efficient photocatalyst performance among the tested samples. The photocatalytic mechanism involves heterojunctions formed in the Bi2S3/SnS2, which promoted effective separation of photoinduced electrons and holes.

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