scholarly journals Synthesis of Supported Metal Nanoparticles (Au/TiO2) by the Suspension Impregnation Method

2020 ◽  
Vol 4 (3) ◽  
pp. 89
Author(s):  
Carolina Rodríguez-Martínez ◽  
Ángel Emilio García-Domínguez ◽  
Fernando Guerrero-Robles ◽  
Rafael Omar Saavedra-Díaz ◽  
Gilberto Torres-Torres ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Nitrogen Adsorption ◽  
Emission Spectrometry ◽  
Particle Sizes ◽  
Impregnation Method ◽  
Average Pore ◽  
Reduction Potentials

This work reports a new technique called “Suspension Impregnation Method” (SiM) as an alternative to the “Incipient Impregnation Method” (IiM) for the synthesis of noble metal (Au) nanoparticles. The SiM was used to synthesize gold nanoparticles supported by titanium oxide and compared with those of IiM. The reactor for the SiM technique was based on the principles of mixing, heat, and mass transfer of the suspension reactors and the metal particle synthesis was processed in situ under the oxidation reduction potentials. Three different conditions were established to observe the effect of pH on the size of the metal particles: acid (HCl), neutral (water) and alkaline (urea). The samples were characterized by nitrogen adsorption, X-Ray Diffraction (XRD), Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), Thermogravimetric Analysis (TGA)/Differential Thermal Analysis (DTA), Transmission Electron Microscopy (TEM) and CO2 adsorption. The surface area was slightly modified, and the average pore diameter was reduced in all materials. The structure of the titanium oxide was not altered. A deposit of organic material was detected in samples synthesized in alkaline medium for both methods. The pH influenced the formation of conglomerates in IiM and resulted in large particle sizes (3–9 nm). In contrast, an in situ reduction in the species in SiM resulted in smaller particle sizes than IiM (2–3 nm).

Effect of Annealing Conditions on the Dissolution Process of Complex Carbonitrides in a V-Nb-Ti Microalloyed Steel

2018 ◽  
Vol 941 ◽  
pp. 21-26
Author(s):  
Gloria Basanta ◽  
Ana L. Rivas ◽  
Ervis Díaz ◽  
Carlos Parra
Keyword(s):  
Inductively Coupled Plasma ◽  
Microalloyed Steel ◽  
Optical Emission ◽  
Dissolution Process ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Annealing Conditions ◽  
Plasma Optical Emission Spectrometry

The present work has been undertaken to assess the evolution of dissolution process of large dendritic precipitates in a V-Nb-Ti microalloyed steel. The study was performed by reheating the samples at 1250°C, simulating the industrial reheating practices at laboratory scale and in situ, following industrial profile; afterwards the samples were quenched in 10%NaCl aqueous solution. The characterization of the material was carried out by scanning electron microscopy accompanied with dispersive energy spectrometry, and chemical analysis by inductively coupled plasma optical emission spectrometry. The results showed a partial dissolution of dendritic precipitates. This process ocurred by a progressive dissolving the Nb-rich shells formed over cuboidal particles and primary arm of well-faceted dendritic precipitates, and by fragmentation and spheroidization of secondary branches. These processes gave rise to spherical Nb rich precipitates and cuboidal particles at the reheating conditions used in this study. Both type of particles contain vanadium.

Photocatalytic Removal of 2,4-D Herbicide on Lanthanum Oxide-Modified Titanium Dioxide

2015 ◽  
Vol 1112 ◽  
pp. 168-171
Author(s):  
Wai Ruu Siah ◽  
Nur Azmina Roslan ◽  
Hendrik O. Lintang ◽  
Mustaffa Shamsuddin ◽  
Leny Yuliati
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Inductively Coupled Plasma ◽  
Lanthanum Oxide ◽  
Electrochemical Impedance ◽  
Uv Light ◽  
Photogenerated Electron ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Impregnation Method

Titanium dioxide (TiO2) has been recognized as an active photocatalyst for degradation of various organic pollutants. In this study, in order to improve the photocatalytic activity of TiO2, the effect of lanthanum oxide modification was investigated by using commercial P25 as the benchmark. Lanthanum oxide/P25 TiO2 composites with 0.1, 0.5, 1 and 5 mol% of La loadings were prepared via an impregnation method. The resultant composites were characterized by X-ray diffraction (XRD), UV-Vis absorption spectroscopy, transmission electron microscopy (TEM), inductively coupled plasma optical emission spectrometry (ICP-OES) and electrochemical impedance spectroscopy (EIS). It was confirmed that the addition of lanthanum oxide did not much affect the crystallinity, crystal structure and the morphology of P25 TiO2. The catalytic activities of the lanthanum oxide/P25 TiO2 catalysts were tested by using 2,4-dichlorophenoxyacetic acid (2,4-D) as the test pollutant and UV light as the irradiation source. The reaction was caried out for 1 hour at room temperature and the percentage removal was determined using a UV spectrophotometer. The results showed that La loading was an important factor that influenced the photocatalytic activity of the composites. After 1 hour reaction, the best catalyst with 0.1 mol% of La loading showed 24% higher photocatalytic activity than the unmodified P25 TiO2 catalyst. It is shown by EIS that the enhanced photocatalytic activity of the composites was due to the ability of lanthanum oxide in improving the charge separation of the photogenerated electron-hole pairs in TiO2.

Nanosecond laser ablation tandem inductively coupled plasma mass and optical emission spectrometry for micro-chemical elemental analysis

2017 ◽  
Vol 32 (11) ◽  
pp. 2246-2253 ◽  
Author(s):  
Gelian Gong ◽  
Saijun Sun ◽  
Jibin Zhou ◽  
Congyin Li ◽  
Xu Liang ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Nanosecond Laser ◽  
Icp Oes ◽  
Inductively Coupled ◽  
Concentration Determination ◽  
Nanosecond Laser Ablation ◽  
Icp Ms

Simultaneous in situ concentration determination by LA-ICP-MS and LA-ICP-OES.

Silver Ion Modified Anionic Surfactant Templated Mesoporous Silica Adsorption Materials for the Removal of Dimethyl Sulfide at Ambient Temperature

2012 ◽  
Vol 512-515 ◽  
pp. 2412-2418
Author(s):  
Xiao Dan Zhang ◽  
Zhui Hui Hu ◽  
Dong Hui Zhang
Keyword(s):  
Mesoporous Silica ◽  
Inductively Coupled Plasma ◽  
Dimethyl Sulfide ◽  
Optical Emission ◽  
Nitrogen Adsorption ◽  
Silver Ion ◽  
Emission Spectrometry ◽  
Ambient Temperatures ◽  
Inductively Coupled ◽  
Adsorption Desorption

Silver ion modified mesoporous silica (Ag-AMS-2) was prepared by using N-lauroyl-L-glutamic acid as structure directing agents and applied to dimethly sulfide (DMS) removal at ambient temperatures. The silver ion interacted with the amino group through coordination bonds and then the silver ion were as the adsorptive sites of the DMS. These Ag-AMS-2 materials were characterized by X-ray diffraction (XRD), nitrogen adsorption desorption, high-resolution transmission electron microscopy (HRTEM), thermal analysis and inductively coupled plasma optical emission spectrometry (ICP-OES). The performance of these Ag-AMS-2 materials as DMS adsorbents was tested using a dynamic breakthrough test. And these samples showed high removal efficiency and high saturation adsorption capacity of DMS.

Friedel-Crafts alkylation of benzene with benzyl alcohol over H-MCM-22

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Deniz Karabulut ◽  
Sema Akyalcin
Keyword(s):  
Benzyl Alcohol ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Hydrothermal Condition ◽  
Nitrogen Adsorption ◽  
Product Distribution ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Alkylation Of Benzene ◽  
Temperature Programmed

Abstract MCM-22 was synthesized by using silicic acid powder as a silica source under the static hydrothermal condition and characterized by X-ray diffraction, nitrogen adsorption-desorption isotherms, scanning electron microscopy, inductively coupled plasma optical emission spectrometry, and temperature-programmed desorption of ammonia. The liquid phase benzylation of benzene with benzyl alcohol to diphenylmethane was investigated over H-MCM-22. The effects of reaction parameters on the conversion of benzyl alcohol and product distribution were determined. Under optimal reaction conditions, diphenylmethane yield of 92.1% was achieved for 99.3% conversion of benzyl alcohol in 3 h of reaction period. The reusability of the catalyst was also investigated after calcination of the catalyst in stagnant air at 500 °C for 4 h. The results show that the organic species produced during the reaction deposited in the catalyst lead to the deactivation of the catalyst and the calcination of the deactivated catalyst causes catalyst dealumination.

scholarly journals The Development of Metal-Carbon Catalysts for Oxidative Desulfurization of Diesel Fractions

2020 ◽  
Vol 22 (2) ◽  
pp. 81
Author(s):  
Z.R. Ismagilov ◽  
E.V. Matus ◽  
O.S. Efimova ◽  
L.M. Khitsova ◽  
A.N. Popova ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Inductively Coupled Plasma ◽  
Oxidative Desulfurization ◽  
Optical Emission ◽  
Nitrogen Adsorption ◽  
Physicochemical Characteristics ◽  
Emission Spectrometry ◽  
Incipient Wetness Impregnation ◽  
Inductively Coupled ◽  
Carbon Catalysts

Metal-carbon materials M/CNTs (M = Ce, Сu, Mo) were synthesized by incipient wetness impregnation and their physicochemical characteristics were studied using various methods (inductively coupled plasma optical emission spectrometry, thermal analysis coupled with mass spectrometry, low-temperature nitrogen adsorption, X-ray diffraction and structural analysis, scanning electron microscopy, and Raman spectroscopy). It was found that M/CNTs (M = Ce, Сu, Mo) are the mesoporous materials consisting of carbon nanotubes with deposited СeO2, Сu2O/Cu or МоО3/MoO2 particles, respectively. The dispersion of supported species and their deposition uniformity improve in the series Сu < Се < Мо. The type of metal was shown to affect thermal stability as well as the textural and structural properties of the samples. The thermal stability of materials increases in the series Ce < Cu ≈ Mo, which is caused by different redox properties of the metals and also by the composition of products of the metal precursor decomposition. It is promising to use the developed materials as the catalysts for deep purification of diesel fraction components from sulfur compounds.

scholarly journals Verifying the feasibility of using Hand-Held X-ray fluorescence spectrometer to analyze Linqing brick: evaluation of the influencing factors and assessing reliability

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Zexuan Chen ◽  
Long Zhang ◽  
Feng Hou ◽  
Jialiang Xie
Keyword(s):  
Influencing Factors ◽  
Inductively Coupled Plasma ◽  
Cross Validation ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Chinese History ◽  
X Ray ◽  
Inductively Coupled ◽  
Fluorescence Spectrometer

Abstract Linqing brick is quite popular in Chinese history. Currently, identifying the origin of Linqing brick is an important issue to be studied in the field of archeology and architectural history in China. Hand-Held X-ray fluorescence (HH-XRF) spectrometry enables the in situ determination of the main elements in Linqing brick in a rapid non-destructive manner. HH-XRF is important in identifying the origin of Linqing brick. However, HH-XRF could be influenced by certain factors and may be capable of measuring only the element contents of the surface for the bricks in situ. The present study aimed to verify the reliability of HH-XRF and to systematically evaluate the different factors influencing measurement precision and accuracy so that scientific advice could be provided regarding the usage of HH-XRF for this application. Four experiments were performed to determine the influencing factors and assess the reliability through cross-validation using inductively coupled plasma optical emission spectrometry (ICP-OES). Finally, the influence of the different studied factors was studied, and the reliability of HH-XRF was ensured. The facts to consider about the measurement time, cross validation, criteria to select points, treat surface and getting final data and how to avoid the effect of rain, while using this method, are provided.

scholarly journals Verifying the feasibility of using Hand-Held X-ray fluorescence spectrometer to analyze Linqing brick: evaluation of the influencing factors and assessing reliability

2020 ◽  
Author(s):  
Zexuan Chen ◽  
Long Zhang ◽  
Feng Hou ◽  
Jialiang Xie
Keyword(s):  
Influencing Factors ◽  
Inductively Coupled Plasma ◽  
Cross Validation ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Chinese History ◽  
X Ray ◽  
Inductively Coupled ◽  
Fluorescence Spectrometer

Abstract Linqing brick is quite popular in Chinese history. Currently, identifying the origin of Linqing brick is an important issue to be studied in the field of archeology and architectural history in China. Hand-Held X-ray fluorescence (HH-XRF) spectrometry enables the in-situ determination of the main elements in Linqing brick in a rapid non-destructive manner. HH-XRF is important in identifying the origin of Linqing brick. However, HH-XRF could be influenced by certain factors and may be capable of measuring only the element contents of the surface for the bricks in situ. The present study aimed to verify the reliability of HH-XRF and to systematically evaluate the different factors influencing measurement precision and accuracy so that scientific advice could be provided regarding the usage of HH-XRF for this application. Four experiments were performed to determine the influencing factors and assess the reliability through cross-validation using inductively coupled plasma optical emission spectrometry (ICP-OES). Finally, the influence of the different studied factors was studied, and the reliability of HH-XRF was ensured. The facts to consider about the measurement time, cross validation, criteria to select points, treat surface and getting final data and how to avoid the effect of rain, while using this method, are provided.

Effect of process variations of polycaprolactone modification on wood durability, dimensional stability and boron leaching

Holzforschung ◽  
2019 ◽  
Vol 73 (9) ◽  
pp. 847-858 ◽  
Author(s):  
Mahmut Ali Ermeydan ◽  
Zeynep Nur Kartal ◽  
Eylem D. Tomak
Keyword(s):  
Dimensional Stability ◽  
Cell Walls ◽  
Inductively Coupled Plasma ◽  
Graft Polymerization ◽  
Optical Emission ◽  
Process Variations ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Biological Durability

AbstractIn this study,in situgraft polymerization of ε-caprolactone (CL) was studied for its potential to limit boric acid (BA) leaching from wood, and to increase the dimensional stability and biological durability of wood againstConiophora puteanaandTrametes versicolorfungi. For this purpose, CL monomer with/without BA was impregnated into wood, and the monomer was polymerized in wood cell walls using various methods and combinations of reactants. It was found that biodegradable polycaprolactone (PCL) grafting at high monomer concentrations could inhibit fungal degradation of wood cell walls, as well as improve the dimensional stability of wood up to 55% and reduce water uptake (WU) by about 50%. However, inductively coupled plasma-optical emission spectrometry (ICP-OES) analysis revealed thatin situgraft polymerization of CL is not an effective method to prevent BA leaching from wood.

scholarly journals Verifying the feasibility of using Hand-Held X-ray fluorescence spectrometer to analyze Linqing brick: evaluation of the influencing factors, assessing reliability, and providing scientific advice

2020 ◽  
Author(s):  
Zexuan Chen ◽  
Long Zhang ◽  
Feng Hou ◽  
Jialiang Xie
Keyword(s):  
Influencing Factors ◽  
Inductively Coupled Plasma ◽  
Cross Validation ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Chinese History ◽  
Scientific Advice ◽  
X Ray ◽  
Inductively Coupled

Abstract Linqing brick is quite popular in Chinese history. Currently, identifying the origin of Linqing brick is an important issue to be studied in the field of archeology and architectural history in China. Hand-Held X-ray fluorescence (HH-XRF) spectrometry enables the in-situ determination of the main elements in Linqing brick in a rapid non-destructive manner. HH-XRF is important in identifying the origin of Linqing brick. However, HH-XRF could be influenced by certain factors and may be capable of measuring only the element contents of the surface for the bricks in situ. The present study aimed to verify the reliability of HH-XRF and to systematically evaluate the different factors influencing measurement precision and accuracy so that scientific advice could be provided regarding the usage of HH-XRF for this application. Four experiments were performed to determine the influencing factors and assess the reliability through cross-validation using inductively coupled plasma optical emission spectrometry (ICP-OES). Finally, the influence of the different studied factors was studied, and the reliability of HH-XRF was ensured. The facts to consider about the measurement time, cross validation, criteria to select points, treat surface and getting final data and how to avoid the effect of rain, while using this method, are provided.

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