Quantitation of cefepime · 2HCl dihydrate in cefepime · 2HCl monohydrate by diffuse reflectance IR and powder X-ray diffraction techniques

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.

Download Full-text

Synthesis and Characterization of K-Ta Mixed Oxides for Hydrogen Generation in Photocatalysis

International Journal of Photoenergy ◽

10.1155/2012/525727 ◽

2012 ◽

Vol 2012 ◽

pp. 1-7 ◽

Cited By ~ 5

Author(s):

Beata Zielińska ◽

Ewa Mijowska ◽

Ryszard J. Kalenczuk

Keyword(s):

Diffuse Reflectance ◽

Hydrogen Generation ◽

Mixed Oxides ◽

X Ray Diffraction ◽

X Ray ◽

Raman Spectroscopic ◽

Photocatalytic Hydrogen Generation ◽

Irregular Structure ◽

Transmission Electron

K-Ta mixed oxides photocatalysts have been prepared by impregnation followed by calcination. The influence of the reaction temperature (450°C–900°C) on the phase formation, crystal morphology, and photocatalytic activity in hydrogen generation of the produced materials was investigated. The detailed analysis has revealed that all products exhibit high crystallinity and irregular structure. Moreover, two different crystal structures of potassium tantalates such as KTaO3and K2Ta4O11were obtained. It was also found that the sample composed of KTaO3and traces of unreacted Ta2O5(annealed at 600°C) exhibits the highest activity in the reaction of photocatalytic hydrogen generation. The crystallographic phases, optical and vibronic properties were examined by X-ray diffraction (XRD) and diffuse reflectance (DR) UV-vis and resonance Raman spectroscopic methods, respectively. Morphology and chemical composition of the produced samples were studied using a high-resolution transmission electron microscope (HR-TEM) and an energy dispersive X-ray spectrometer (EDX) as its mode.

Download Full-text

Preparation and Characterizations of In0.1SnxZn0.85-2xS Powder Photocatalysts for Hydrogen Production under Visible Light Irradiation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.364.238 ◽

2011 ◽

Vol 364 ◽

pp. 238-242 ◽

Cited By ~ 1

Author(s):

Kimi Melody ◽

Yuliati Leny ◽

Mustaffa Shamsuddin

Keyword(s):

Hydrogen Production ◽

Visible Light ◽

Solid Solutions ◽

Visible Light Irradiation ◽

Diffuse Reflectance ◽

Average Rate ◽

Light Irradiation ◽

X Ray Diffraction ◽

X Ray ◽

Uv Visible

A series of In0.1SnxZn0.85-2xS solid solutions was synthesized by hydrothermal method and employed as photocatalyst for photocatalytic hydrogen evolution under visible light irradiation. The structures, optical properties and morphologies of the solid solutions were studied by X-ray diffraction, diffuse reflectance UV–visible spectroscopy and field emission scanning electron microscopy. From the characterizations, it was confirmed that In0.1SnxZn0.85-2xS solid solution can be obtained and they have nanosized particles. The highest photocatalytic activity was observed on In0.1Sn0.03Zn0.79S photocatalyst, with average rate of hydrogen production 3.05 mmol/h, which was 1.2 times higher than the In0.1Zn0.85S photocatalyst.

Download Full-text

Use of Steel Industry Wastes for the Preparation of Self-Cleaning Mortars

Materials ◽

10.3390/ma12040621 ◽

2019 ◽

Vol 12 (4) ◽

pp. 621 ◽

Cited By ~ 3

Author(s):

José Balbuena ◽

Luis Sánchez ◽

Manuel Cruz-Yusta

Keyword(s):

Steel Industry ◽

Diffuse Reflectance ◽

Construction Material ◽

Added Value ◽

X Ray Diffraction ◽

X Ray ◽

Before And After ◽

New Material ◽

Lamination Process ◽

Self Cleaning

An important problem, which must be solved, is the accumulation of industrial waste in landfills. Science has an obligation to transform this waste into new products and, if possible, with high added value. In this sense, we propose the valorization of the waste which is generated in the steel lamination process (HSL) through its conversion into a new material with photocatalytic activity which is suitable for use as an additive to obtain a self-cleaning construction material. The valorization of steel husk lamination waste is achieved through a grinding process, which allows the sample to be homogenized, in size, without altering its phase composition, and a thermal treatment that turns it into iron oxide, which acts as a photocatalyst. These residues, before and after treatment, were characterized by different techniques such as PXRD (Powder X-Ray Diffraction), TGA (Thermogravimetric Analysis), SBET (Specific surface area, Brunauer-Emmett-Teller), SEM (Scanning Electron Microscopy) and Diffuse reflectance (DR). MB and RhB tests show that this material is capable of self-cleaning, both of the material itself and when it is incorporated into a construction material (mortar). In addition, the NOx gas elimination test shows that it is also capable of acting on greenhouse gases such as NOx.

Download Full-text

Photocatalytic properties of p-n heterojunction Ag2CO3/Ag3PO4/Ni thin films under visible light

Functional Materials Letters ◽

10.1142/s1793604719500851 ◽

2019 ◽

Vol 12 (06) ◽

pp. 1950085 ◽

Cited By ~ 1

Author(s):

Di Zhao ◽

Xuezheng An ◽

Yaxian Sun ◽

Guihua Li ◽

Hongyan Liu ◽

...

Keyword(s):

Thin Film ◽

Thin Films ◽

Visible Light ◽

Visible Light Irradiation ◽

Diffuse Reflectance ◽

Diffuse Reflectance Spectroscopy ◽

Light Irradiation ◽

X Ray Diffraction ◽

X Ray ◽

Photodegradation Efficiency

p-n heterojunction Ag2CO3/Ag3PO4/Ni thin films were prepared by electrochemical co-deposition. The surface morphology and structural properties of the thin films were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalytic (PC) properties of the Ag2CO3/Ag3PO4/Ni composite thin films were investigated by their ability to degrade rhodamine B (RhB) and Congo red (CR) under visible light irradiation. The results showed that the photodegradation efficiency of RhB by an Ag2CO3/Ag3PO4/Ni thin film under visible-light irradiation for 30[Formula: see text]min (98.84%) was 2.64 times higher than that of an Ag3PO4/Ni thin film and 3.44 times higher than of an Ag2CO3/Ni thin film. The presence of a [Formula: see text]-[Formula: see text] heterojunction greatly increased the charge conductivity of the film and its ability to photocatalytically reduce dissolved oxygen, which are the main reasons for the improved PC performance of the Ag2CO3/Ag3PO4/Ni films.

Download Full-text

Clay intercalated Cu(II) amino acid complexes: synthesis, spectroscopy and catalysis

Clay Minerals ◽

10.1180/claymin.1996.031.4.06 ◽

1996 ◽

Vol 31 (4) ◽

pp. 491-500 ◽

Cited By ~ 19

Author(s):

L. Fu ◽

B. M. Weckhuysen ◽

A. A. Verberckmoes ◽

R. A. Schoonheydt

Keyword(s):

Amino Acid ◽

Diffuse Reflectance ◽

Diffuse Reflectance Spectroscopy ◽

The Novel ◽

Oxidation Reactions ◽

Axially Symmetric ◽

X Ray Diffraction ◽

X Ray ◽

Spin Resonance ◽

Synthesized Materials

AbstractComplexes of Cu(lysine)2+2 and Cu(histidine)2+2 have been intercalated between the layers of saponite clays by a simple cation exchange procedure from aqueous solutions of preformed Cu(amino acid)2-complexes. Successful immobilization was obtained with an amino acid: Cu2+ ratio of 5, and a pH of 10 and 7.3 for lysine and histidine, respectively. The synthesized materials were investigated as powders and as thin films by electron spin resonance (ESR), diffuse reflectance spectroscopy (DRS) and X-ray diffraction (XRD). The light blue clays are characterized by an axially symmetric ESR spectrum with A//= 192 G, g//= 2.23 and g⊥ = 2.07, and a d-d absorption band around 600 nm, due to the intercalated planar Cu2+-complexes. Ammonia interacts reversibly with these intercalated complexes, suggesting the presence of a free coordination site. The novel synthesized materials are active in various oxidation reactions with t-butyl hydroperoxide as oxidant.

Download Full-text

Functionalization of hydroxyapatite derived from cockle (Anadara granosa) shells into hydroxyapatite–nano TiO2 for photocatalytic degradation of methyl violet

Sustainable Environment Research ◽

10.1186/s42834-019-0034-3 ◽

2019 ◽

Vol 29 (1) ◽

Author(s):

Is Fatimah ◽

Della Fahrani ◽

Tia Harmawantika ◽

Imam Sahroni ◽

Azlan Kamari ◽

...

Keyword(s):

Photocatalytic Activity ◽

Diffuse Reflectance ◽

Methyl Violet ◽

Gas Sorption ◽

X Ray Diffraction ◽

Positive Role ◽

X Ray ◽

Prepared Material ◽

Photooxidation Mechanism ◽

Anadara Granosa

AbstractPhotocatalyst of hydroxyapatite–nano TiO2 (HAp-nTiO2) was prepared from phosphatation of calcined cockle (Anadara granosa) shells followed by dispersion of nano TiO2 powder into HAp precipitate and calcination at 400 °C for 2 h. The prepared material was characterized using X-ray diffraction, scanning electron microscope–energy dispersive X-ray spectrophotometry, gas sorption analysis, and UV-Vis diffuse reflectance spectrophotometry. The photocatalytic activity of the material was evaluated for methyl violet degradation over photocatalysis and photooxidation mechanism. The results showed that the homogeneous dispersion of TiO2 in the HAp-nTiO2 composite was achieved, as seen in the X-ray diffraction analysis, diffuse reflectance UV-Vis, and gas sorption analyses. The physicochemical and photocatalytic character of the composite exhibited the positive role of HAp as TiO2 support in enhancing the photocatalytic activity with a higher turnover number and reusability property than that of pure TiO2. It was also noted that the HAp-nTiO2 composite demonstrated rapid methyl violet degradation over photooxidation rather than by photocatalytic mechanism.

Download Full-text

Sensing Nanoparticulate ZnO with Benzimidazole Derivative by Fluorescence

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.543.63 ◽

2013 ◽

Vol 543 ◽

pp. 63-67

Author(s):

Jayabharathi Jayaraman ◽

Jayamoorthy Karunamoorthy

Keyword(s):

Diffuse Reflectance ◽

Electrochemical Impedance ◽

Fluorescent Sensor ◽

Sol Gel ◽

Benzimidazole Derivative ◽

X Ray Diffraction ◽

X Ray ◽

Uv Visible ◽

Doped Zno ◽

Scanning Electron

A sensitive benzimidazole derivative fluorescent sensor for nanoparticulate ZnO has been designed and synthesized. The nanocrystalline ZnO, Ag doped ZnO and Cu doped ZnO have been synthesised by sol-gel method and characterized by powder X-ray diffraction, scanning electron microscopy (SEM) and UV-visible diffuse reflectance, photoluminescence and electrochemical impedance spectroscopies. The synthesized sensor emits fluorescence at 360 nm and this fluorescence is selectively enhanced by nanocrystalline ZnO. This technique is sensitive to detect and estimate ZnO at micro molar level. Impurities such as Ag and Cu do not hamper the sensitivity of this technique significantly. Keywords: Sensor, SEM, EDX, Impedance, Fluorescence

Download Full-text

Preparation of Nanosized TiO2 Synthesized by Sol-Gel Pathway Using Ionic Liquid as Assistant and its Photocatalytic Activities

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.535-537.2240 ◽

2012 ◽

Vol 535-537 ◽

pp. 2240-2244

Author(s):

Wei Wei ◽

Chang Shun Yu ◽

Shao Jun Wang ◽

Qing Da An

Keyword(s):

Ionic Liquid ◽

Diffuse Reflectance ◽

Sol Gel ◽

Rutile Phase ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Photocatalytic Activities ◽

Average Size ◽

Nanosized Tio2

Nanosized TiO2 particles were synthesized by sol-gel method using ionic liquid as assistant. The samples were characterized by UV-vis diffuse reflectance spectra, X-ray diffraction (XRD), transmission electron microscopy (TEM). It was shown that the phase detectable was mainly rutile phase with uniform sphericity and the average size was 10nm. Along with the rise of sintering temperature, grain diameter became bigger. The photocatalytic activities of nanosized TiO2 were evaluated by the reduction yield in the presence of CO2 and water. The result showed that TiO2 catalysts has efficient photocatalytic activities, of which made with [OMIM]BF4 displayed the highest photocatalytic active in the experiment.

Download Full-text

Synthesis and Characterization of Lead Sulfide Nanostructures with Different Morphologies via Simple Hydrothermal Method

High Temperature Materials and Processes ◽

10.1515/htmp-2015-0010 ◽

2016 ◽

Vol 35 (6) ◽

pp. 559-566 ◽

Cited By ~ 1

Author(s):

Elaheh Esmaeili ◽

Mohammad Sabet ◽

Masoud Salavati-Niasari ◽

Kamal Saberyan

Keyword(s):

Electron Microscopy ◽

Diffuse Reflectance ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

Product Size ◽

X Ray ◽

Transmission Electron ◽

Hydrothermal Approach ◽

Size And Morphology

AbstractPbS nanostructures were synthesized successfully via hydrothermal approach with a new precursor. The products were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–Vis diffuse reflectance spectroscopy (DRS). The effect of different sulfur sources were investigated on product size and morphology.

Download Full-text