GOx LbL Based Film Growth over Porous Alumina (PA) Followed by Diffuse Reflectance Spectroscopy

2015 ◽  
Vol 1805 ◽  
Author(s):  
Letícia M. M. Ferro ◽  
Marystela Ferreira ◽  
Francisco Trivinho-Strixino
Keyword(s):  
Electron Microscopy ◽  
Sulfonic Acid ◽  
Diffuse Reflectance ◽  
Film Growth ◽  
Diffuse Reflectance Spectroscopy ◽  
Porous Alumina ◽  
Reflectance Spectroscopy ◽  
Total Reflectance ◽  
Polyallylamine Hydrochloride ◽  
Scanning Electron

ABSTRACTIn this study, the growth of LbL film of polyallylamine hydrochloride (PAH), polyvinyl sulfonic acid (PVS) and glucose oxidase (GOx) in porous anodic alumina substrate (PAA) was accompanied by total reflectance technique. The PAA substrate was synthesized with aluminum anodisation and sample morphology was characterized by scanning electron microscopy (SEM).

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.

Photocatalytic Decolorization of Methylene Blue by Ferric Stearate, Ferrocene and NiDBC under Sunlight Irradiation

2011 ◽  
Vol 695 ◽  
pp. 133-136
Author(s):  
Zhao Zhao ◽  
Xue Gang Luo ◽  
Xiao Yan Lin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Methylene Blue ◽  
Aqueous Solutions ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Sunlight Irradiation ◽  
Photocatalytic Decolorization ◽  
Scanning Electron

In this work, ferric stearate, ferrocene and nickel N,N-dibuty dithiocarbamate (NiDBC) were utilized as photocatalyst for the decolorization of methylene blue (MB) aqueous solutions under sunlight irradiation. Pure MB solution was used as reference. Absorption intensities and surface morphology of these photocatalyst were investigated by Diffuse Reflectance Spectroscopy (DRS) and Scanning Electron Microscopy (SEM).The study indicated that ferric stearate had minimal promotion to the decolorization of MB aqueous solutions; and ferrocene exhibited better photocatalysis ability after had been irradiated 60 hours. In this study, NiDBC showed the best photocatalysis ability from the beginning. Furthermore, NiDBC enhanced the decolorization of MB after been irradiated for 31 hours. And after being irradiated 270 hours, the MB aqueous was completely decolorized by NiDBC.

scholarly journals Controllable Synthesis and Photocatalytic Activity of Nano-BiOBr Photocatalyst

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Xiaoyang Wang ◽  
Fuchun Zhang ◽  
Yanning Yang ◽  
Yu Zhang ◽  
Lili Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Deionized Water ◽  
Bandgap Energy ◽  
Controllable Synthesis ◽  
X Ray ◽  
Glycol Solution ◽  
Scanning Electron

Nano-BiOBr photocatalysts were successfully prepared by hydrothermal synthesis using the ethylene glycol solution. The nano-BiOBr photocatalysts were characterized and investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), photoluminescence (PL), and UV-vis diffuse reflectance spectroscopy (UV-Vis DRS), and the catalytic ability toward photodegradation of rhodamine B (RhB) was also explored. The results showed that the crystallinity of the nano-BiOBr photocatalyst decreased with the increase of the concentration, while it increased with the amount of the applied deionized water. The morphology of the nano-BiOBr photocatalyst changed from microspheres to cubes and then to a mixture of microspheres and flakes with the increasing of the concentration and from microspheres to flakes with the addition of the deionized water. The results indicated that the concentration and solvents have an essential influence on the bandgap energy values of the nano-BiOBr photocatalyst, and photocatalyst showed an excellent photocatalyst activity toward photodegradation of RhB. The degradation yields of photocatalyst decreased with the increase of the concentration and increased with the addition of the deionized water. PL intensity of photocatalyst increased with the increase of the concentration and weakened with the addition of the deionized water.

Sonochemical Decolourisation of Reactive Blue 21 and Acid Red 114 in the Presence of TiO2 and Rare Earths

2012 ◽  
Vol 734 ◽  
pp. 237-246 ◽  
Author(s):  
Pankaj ◽  
Shikha Goyal
Keyword(s):  
Electron Microscopy ◽  
Rare Earths ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
X Ray ◽  
Amorphous Phases ◽  
Scanning Electron

The ultrasonic decolourisation of two commonly used textile dyes, Acid Red 114 (AR 114) and Reactive Blue 21 (RB 21), with different chromophoric groups, azo and phthalocyanine respectively, has been studied using TiO2 (consisting of mixture of crystalline and amorphous phases) in the presence of rare earths ions (Pr3+, Ce4+). The characterisation of TiO2 has been done through X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, diffuse reflectance spectroscopy (DRS) and N2 adsorption techniques. The decolourisation of AR 114 was faster than for RB 21 under all the experimental conditions. Almost complete decolourisation of both dyes was achieved in 5 min in the presence of US+TiO2+Ce. Ce4+ was found to be more effective than Pr3+. The decolourisation reaction followed second order kinetics. The effects of initial dye concentration and amount of TiO2 on the decolourisation of dyes have been found to be in the order; US+TiO2+Ce > US+TiO2+Pr > US+Ce > US+Pr > US+TiO2 > TiO2 >US. The decolourisation rate increased with increase in TiO2 amount and decreased with increase in initial dye concentration.

Synthesis of Eu-Doped Bi2O3/CeO2 Composite with Enhanced Photocatalytic Activity by a Facile Sol–Gel–Calcination Route

2015 ◽  
Vol 68 (10) ◽  
pp. 1562 ◽  
Author(s):  
Fengjun Zhang ◽  
Guosheng Xiao ◽  
Wei Lu ◽  
Tianye Wang ◽  
Limin Xuan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible ◽  
Scanning Electron

Eu-Doped Bi2O3/CeO2 composites were successfully synthesized by a facile sol–gel–calcination route. The as-prepared composites were prepared with different molar ratios of Bi/Ce/Eu by the sol–gel route, and then calcined at 500°C for 2 h. The photocatalytic efficiencies of all composites were tested by degradation of methyl orange (MO) under visible light irradiation. The result suggested that the best composite is the one that was prepared with a Bi/Ce/Eu mole ratio of 8 : 8 : 1, and achieved a MO degradation rate of nearly 98.5 % within 2 h of irradiation. The as-prepared composites were characterized by X-ray diffraction, scanning electron microscopy, inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, UV-visible diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The X-ray diffraction and scanning electron microscopy results suggested that Eu doping may have led to some lattice distortion and particle aggregation that enhanced the photocatalytic activity of the photocatalyst. The UV-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy results showed that Eu-doped Bi2O3/CeO2 exhibited higher visible light response properties and enhanced separation of the photogenerated electron–hole pairs, which is the main reason for the higher photocatalytic activity. In general, this study could provide a facile route to synthesize Eu-doped Bi2O3/CeO2 composites with enhanced photocatalytic activity by a sol–gel–calcination route for environmental purification.

scholarly journals The Effect of the Metal Type on Luminescence and Photocatalytic Properties of Lanthanide–Organic Frameworks–Modified Titania

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 11
Author(s):  
Patrycja Parnicka ◽  
Adriana Zaleska-Medynska
Keyword(s):  
Electron Microscopy ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Degradation Mechanism ◽  
Reflectance Spectroscopy ◽  
Photocatalytic Properties ◽  
Tio2 Photocatalysts ◽  
Metal Type ◽  
Insight Into ◽  
Scanning Electron

A series of lanthanide–naphthalenedicarboxylates–modified TiO2 (Ln(NDC)-TiO2) photocatalysts were prepared via simple hydrothermal method using Tm, Er, Nd, Ho, Eu, Tb, Yb, or La as metal and 2,6-naphthenedicarboxylic acid as ligand. The photocatalysts were characterized by diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and scanning electron microscopy (SEM). The photocatalytic properties were investigated by employing the photodegradation of phenol in the aqueous phase as a model pollutant. To provide insight into the reactive individuals participating in the degradation mechanism, a test with scavengers was also performed.

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.

Cu-Fe/TiO2 Photocatalyst for Deep Desulfurization Process

2014 ◽  
Vol 875-877 ◽  
pp. 34-38 ◽  
Author(s):  
Chong Fai Kait ◽  
B. Abu Kassim Mohd Eqram ◽  
Bt. Mohd Zaid Hayyiratul Fatimah
Keyword(s):  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Sulfur Removal ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deep Desulfurization ◽  
Desulfurization Process ◽  
Model Oil ◽  
Scanning Electron

A series of Cu-Fe/TiO2photocatalysts were prepared and calcined at 400°C and 500°C for 1 h. The photocatalysts were characterized using diffuse reflectance spectroscopy (DR-UV-Vis), X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The performance for sulfur removal was carried out using model oil containing 100 ppm S (from dibenzothiophene). The highly dispersed Cu-Fe/TiO2photocatalyst displayed mainly spherical shaped particles. The best performing photocatalyst was 0.8wt% Cu-Fe loading and calcined at 400°C (0.8wt400) giving 18% sulfur removal. The band gap for 0.8wt400 was lowered to 2.96 eV compared to 3.21 eV for TiO2.

Influence of EVA Content on the Properties of Extrusion Molding WPCS

2012 ◽  
Vol 557-559 ◽  
pp. 1378-1382
Author(s):  
Xiao Hong Hu ◽  
Dong Fang Li ◽  
Ji Hang Hu ◽  
Li Li
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Wood Flour ◽  
Wood Fiber ◽  
Reflectance Spectroscopy ◽  
Surface Groups ◽  
Comprehensive Performance ◽  
Scanning Electron

EVA was tried to improve the compatibility between wood flour and plastics substrate as a new kind of coupling agent. Infrared diffuse reflectance spectroscopy was applied to examine the changes in surface groups. The influence of the EVA content on the mechanical properties of WPCs was investigated and the morphologies of fractured surfaces were examined using a scanning electron microscope (SEM). Infrared diffuse reflectance spectroscopy shows that the EVA reduced the polarity of the wood flour. When the content of EVA is increased the mechanical properties of WPCs also increased. The SEM showed that EVA can help improve the interface compatibility between the fiber and plastic by aiding in the bonding of more plastic to the wood fiber. The comprehensive performance of the WPCs reached its maximum potential when the EVA level was at 15%.

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