scholarly journals Improved adsorption and degradation performance by S-doping of (001)-TiO2

2019 ◽  
Vol 10 ◽  
pp. 2116-2127 ◽  
Author(s):  
Xiao-Yu Sun ◽  
Xiao Sun ◽  
Xian Zhang ◽  
Ni-Xian Qian ◽  
Min Wang ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Lattice Distortion ◽  
Synergistic Effects ◽  
Chemical Vapor ◽  
Surface Chemical ◽  
Ionic Radii ◽  
Thermal Chemical Vapor Deposition ◽  
Molar Ratios ◽  
Chemical States

In this work, sulfur-doped (S-doped) TiO2 with the (001) face exposed was synthesized by thermal chemical vapor deposition at 180 or 250 °C using S/Ti molar ratios R S/Ti of 0, 0.5, 1, 2, 3, 4 and 5. The S-doped samples synthesized at 250 °C exhibit a significantly improved photocatalytic performance. More precisely, S-doping has the following effects on the material: (1) S can adopt different chemical states in the samples. Specifically, it exists in the form of S2− replacing O2− at a ratio of R S/Ti = 1 and also in the form of S6+ replacing Ti4+ at R S/Ti ≥ 2. As a result, S-doping causes a lattice distortion, because the ionic radii of S2− and S6+ differ from that of the O2− and Ti4+ ions. (2) S-doping increases the adsorption coefficient A e for methylene blue (MB) from 0.9% to 68.5% due to the synergistic effects of the oxygen vacancies, increased number of surface chemical adsorption centers as a result of SO4 2− adsorption on the TiO2 surface and the larger pore size. (3) S-doping increases the MB degradation rate from 6.9 × 10−2 min−1 to 18.2 × 10−2 min−1 due to an increase in the amount of •OH and •O2− radicals.

scholarly journals Greatly improved adsorption and degradation by S-doped (001)-TiO2 via the vapour-thermal method

2019 ◽  
Author(s):  
X Y Sun ◽  
X Zhang ◽  
X Sun ◽  
N X Qian ◽  
Min Wang ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Lattice Distortion ◽  
Synergistic Effects ◽  
Molar Ratio ◽  
Thermal Method ◽  
Adsorption Coefficient ◽  
Ionic Radii ◽  
Chemical States

In this work, sulfur (S) doped (001)-face exposed TiO2 was synthesized via the vapor-thermal method at 180 °C or 250 °C, with an S/Ti molar ratio R S/Ti of 0, 0.5, 1, 2, 3, 4, and 5. The S-doped samples at 250 °C exhibited significantly improved photocatalytic performance. The effects of S doping were as follows: (1) The S element exhibits different chemical states in the samples with different R S/Ti. Specifically, it exists in the form of S2− replacing O2− at R S/Ti = 1, and S6+ replacing Ti4+ at R S/Ti ≥ 2. As a result, S doping causes a lattice distortion because the ionic radii of S2− and S6+ differ from that of the O2− and Ti4+. (2) S-doping increases the adsorption coefficient A e for methylene blue (MB) from 0.9% to 68.5% due to the synergistic effects of the oxygen vacancies, the SO4 2− adsorbed on the TiO2 surface, and the pore size. (3) S-doping increases the MB degradation rate from 6.9 × 10−2 min−1 to 18.2 × 10−2 min−1 due to an increase in the amount of •OH and •O2− radicals.

Highly efficient synthesis of carbon nanocoils on alumina spheres

RSC Advances ◽  
2016 ◽  
Vol 6 (36) ◽  
pp. 30125-30129 ◽  
Author(s):  
Ruixue Cui ◽  
Lujun Pan ◽  
He Ma ◽  
Peng Wang ◽  
Muhammad Asif
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
Efficient Synthesis ◽  
Thermal Chemical Vapor Deposition ◽  
Molar Ratios ◽  
Highly Efficient

Carbon nanocoils (CNCs) and carbon nanotubes (CNTs) can be selectively synthesized on the surfaces of alumina spheres using an Fe2(SO4)3/SnCl2 catalyst with different molar ratios of Fe to Sn by a thermal chemical vapor deposition method.

Study on Binary Mixture System of Lauroyl Sodium Glutamate Surfactant

2021 ◽  
Vol 58 (1) ◽  
pp. 20-26
Author(s):  
Binbin He ◽  
Liangliang Lin ◽  
Hujun Xu
Keyword(s):  
Aggregation Number ◽  
Synergistic Effects ◽  
Chemical Properties ◽  
Surface Chemical ◽  
Solution Theory ◽  
Sodium Glutamate ◽  
Molar Ratios ◽  
Dodecyltrimethylammonium Chloride ◽  
The Difference ◽  
Mixture System

Abstract In the present study, binary mixtures of sodium N-lauroylglutamate (SLG) and dodecyltrimethylammonium chloride (DTAC) or dodecylbetaine (BS-12) were examined for their synergistic effect. The surface chemical properties of the compound systems with different molar ratios were determined by the regular solution theory. Results indicated that both compound systems show synergistic effects of overall synergy, in which the SLG/DTAC system exhibited a better activity than the SLG/BS-12 system. The aggregation number of SLG compound systems was smaller than that of single surfactants, and the difference of the proportion of the two surfactants had little effect on the aggregation number of compound systems.

Graphene oxide mediated co-generation of C-doping and oxygen defects in Bi2WO6 nanosheets: a combined DRIFTS and DFT investigation

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20562-20570 ◽  
Author(s):  
Minglu Sun ◽  
Xing'an Dong ◽  
Ben Lei ◽  
Jieyuan Li ◽  
Peng Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Method ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Synergistic Effects ◽  
No Removal ◽  
Oxygen Defects ◽  
C Doping

The co-generation of C-doping and oxygen vacancies (OVs) in Bi2WO6 nanosheets was achieved by a graphene oxide-mediated hydrothermal method. The photocatalytic performance was highly promoted in NO removal with the synergistic effects of C-doping and OVs.

scholarly journals SURFACE CHEMICAL STATES OF HETEROEPITAXIAL NITRIDE FILMS ON SAPPHIRE BY METALORGANIC CHEMICAL VAPOR DEPOSITION

2004 ◽  
Vol 03 (04n05) ◽  
pp. 655-661 ◽  
Author(s):  
K. LI ◽  
Z. C. FENG ◽  
C.-C. YANG ◽  
J. LIN
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Surface Segregation ◽  
Chemical Vapor ◽  
Aluminum Surface ◽  
Surface Chemical ◽  
Mg Doping ◽  
Chemical States ◽  
Metalorganic Chemical

Surface chemical states of GaN , AlGaN and InGaN by metalorganic chemical vapor deposition, and the influence of different dopants are studied with X-ray Photoelectron Spectroscopy (XPS). The results show that for most of the samples the N 1s peak can be fitted with a dominant GaN peak and a small N – H peak, while Ga 3d can be deconvoluted into three peaks from elemental Ga , GaN and Ga 2 O 3. Si -doping appears to have small influence on the surface chemical states of GaN while the influence of Mg -doping appears larger. In addition to a change in the component intensities, Mg -doping also causes the N 1s and Ga 3d peaks to broaden. The ternary AlGaN sample shows aluminum surface segregation, while the undoped InGaN shows indium surface deficiency.

scholarly journals Ce/Mo metal oxides synthesized with DBD plasma as efficient photocatalysts: Effect of Ce/Mo molar ratios

2021 ◽  
Vol 261 ◽  
pp. 02038
Author(s):  
Kangkang Zheng ◽  
Xumei Tao
Keyword(s):  
Metal Oxides ◽  
Photocatalytic Performance ◽  
Barrier Discharge ◽  
Uv Light ◽  
Molar Ratio ◽  
Dye Wastewater ◽  
Surface Chemical ◽  
Dbd Plasma ◽  
Molar Ratios ◽  
First Time

Ce/Mo metal oxides with different Ce/Mo molar ratios were synthesized via dielectric barrier discharge (DBD) method for the first time and applied as efficient photocatalysts. The morphology and physicochemical properties of the synthesized samples were characterized by XRD, SEM, BET and XPS. Ce/Mo metal oxides synthesized with Ce(NO3)3·6H2O and (NH4)6Mo7O24·4H2O molar ratio of 4:1 exhibited more surface chemical adsorption of oxygen, which were beneficial to the photocatalytic performance. The degradation rate of 1000 mL (50 mg/L) methyl orange could reach 80% within 18 min under UV-light radiation. Ce/Mo metal oxides exhibited excellent photocatalytic performance and had potential application prospect in dye wastewater treatment.

The role of surface chemical states on the photocatalytic behavior of all-inorganic mixed halide perovskite nanocrystals

2019 ◽  
Author(s):  
Andrés Fabián Gualdrón-Reyes ◽  
Iván Mora-Seró ◽  
Eliseo Amado-González ◽  
Jorge-Enrique Rueda-P ◽  
Rogelio Ospina ◽  
...  
Keyword(s):  
Surface Chemical ◽  
Perovskite Nanocrystals ◽  
Chemical States ◽  
Halide Perovskite

scholarly journals Chlorine-Resistant Hollow Nanosphere-Like VOx/CeO2 Catalysts for Highly Selective and Stable Destruction of 1,2-Dichloroethane: Byproduct Inhibition and Reaction Mechanism

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 119
Author(s):  
Yu Huang ◽  
Shiyue Fang ◽  
Mingjiao Tian ◽  
Zeyu Jiang ◽  
Yani Wu ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Acid Sites ◽  
Strong Interactions ◽  
Hollow Nanosphere ◽  
Efficient Removal ◽  
Chlorinated Volatile Organic Compounds ◽  
Molar Ratios ◽  
Volatile Organic ◽  
Redox Ability ◽  
Species Mobility

Developing economical and robust catalysts for the highly selective and stable destruction of chlorinated volatile organic compounds (CVOCs) is a great challenge. Here, hollow nanosphere-like VOx/CeO2 catalysts with different V/Ce molar ratios were fabricated and adopted for the destruction of1,2–dichloroethane (1,2–DCE). The V0.05Ce catalyst possessed superior catalytic activity, reaction selectivity, and chlorine resistance owing to a large number of oxygen vacancies, excellent low-temperature redox ability, and chemically adsorbed oxygen (O− and O2−) species mobility. Typical chlorinated byproducts (CHCl3, CCl4, C2HCl3, and C2H3Cl3) derived from the cleavage of C–Cl and C–C bonds of 1,2–DCE were detected, which could be effectively inhibited by the abundant acid sites and the strong interactions of VOx species with CeO2. The presence of water vapor benefited the activation and deep destruction of 1,2–DCE over V0.05Ce owing to the efficient removal of Cl species from the catalyst surface.

Sign in / Sign up

Export Citation Format

Share Document