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.

Facile synthesis of magnetic Bi25FeO40/rGO catalyst with efficient photocatalytic performance for phenolic compounds under visible light

RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 4905-4908 ◽  
Author(s):  
Yan Wu ◽  
Hanjin Luo ◽  
Xiaolu Jiang ◽  
Hou Wang ◽  
Junjie Geng
Keyword(s):  
Graphene Oxide ◽  
Phenolic Compounds ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Reduced Graphene Oxide ◽  
Photocatalytic Performance ◽  
Utilization Efficiency ◽  
Facile Synthesis ◽  
Facile Hydrothermal Method ◽  
Reduced Graphene

To improve the utilization efficiency of the Bi25FeO40 catalyst, Bi25FeO40-reduced graphene oxide (rGO) composite photo-catalysts were prepared by a facile hydrothermal method.

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 Synthesis of a Novel 1D/2D Bi2O2CO3–BiOI Heterostructure and Its Enhanced Photocatalytic Activity

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1284
Author(s):  
Yin Peng ◽  
Haozhi Qian ◽  
Nannan Zhao ◽  
Yuan Li
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Photocatalytic Performance ◽  
Raw Materials ◽  
Synergistic Effects ◽  
Two Dimensional ◽  
High Quality ◽  
Bioi Nanosheets

A novel 1D/2D Bi2O2CO3–BiOI heterojunction photocatalyst with high-quality interfaces was synthesized through a hydrothermal method by using Bi2O2CO3 nanorods and KI as raw materials. Two-dimensional (2D) BiOI nanosheets uniformly and vertically grow on the 1D porous Bi2O2CO3 rods. Bi2O2CO3–BiOI heterojunctions exhibit better photocatalytic activity than pure Bi2O2CO3 nanorods and BiOI nanosheets. Cr(VI) (30 mg/L), MO (20 mg/L) and BPA (20 mg/L) can be completely degraded in 8–15 min. The superior photocatalytic performance of 1D/2D Bi2O2CO3–BiOI heterojunction is ascribed to the synergistic effects: (a) vertical 2D on 1D multidimensional structure; (b) the formation of the Bi2O2CO3–BiOI p–n heterojunction; (c) high-quality interfaces between Bi2O2CO3 and BiOI.

Preparation and photocatalytic performance of silver-modified and nitrogen-doped TiO2 nanomaterials with oxygen vacancies

2021 ◽  
Author(s):  
Hong Zhang ◽  
Yingyu Jiang ◽  
Baiqin Zhou ◽  
Zhuo Wei ◽  
Zhenya Zhu ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrothermal Method ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Light Response ◽  
Doped Tio2 ◽  
Nitrogen Doped ◽  
Visible Light Response ◽  
Tio2 Nanomaterials ◽  
Modified Hydrothermal Method

A modified hydrothermal method for the synthesis of TiO2 material to achieve a more efficient visible light response.

Low-temperature NOx(x = 1, 2) removal with ˙OH radicals from catalytic ozonation over a RGO–CeO2nanocomposite: the highly promotional effect of oxygen vacancies

RSC Advances ◽  
2016 ◽  
Vol 6 (91) ◽  
pp. 87869-87877 ◽  
Author(s):  
Lina Guo ◽  
Qin Zhong ◽  
Jie Ding ◽  
Zijian Lv ◽  
Wenkai Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Low Temperature ◽  
Ethylene Glycol ◽  
Hydrothermal Method ◽  
Oxygen Vacancies ◽  
Catalytic Ozonation ◽  
Oh Radicals ◽  
Promotional Effect ◽  
Reduced Graphene ◽  
Effect Of Oxygen

CeO2grown on a reduced graphene oxide nanocomposite (RGO–CeO2) was successfully synthesized by a facile alkaline hydrothermal method with the addition of ethylene glycol.

An in situ solid-state heredity-restriction strategy to introduce oxygen defects into TiO2 with enhanced photocatalytic performance

CrystEngComm ◽  
2018 ◽  
Vol 20 (40) ◽  
pp. 6156-6164 ◽  
Author(s):  
Jindou Hu ◽  
Wei Jia ◽  
Jing Xie ◽  
Yali Cao ◽  
Xinhua Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Oxygen Defects ◽  
Restriction Strategy

A green, solid-state heredity-restriction strategy was constructed to create in situ oxygen vacancies in TiO2 without the aid of reductant.

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.

La-Doped ZnWO4 nanorods with enhanced photocatalytic activity for NO removal: effects of La doping and oxygen vacancies

2020 ◽  
Vol 7 (2) ◽  
pp. 356-368 ◽  
Author(s):  
Junli Nie ◽  
Qadeer-Ul Hassan ◽  
Yuefa Jia ◽  
Jianzhi Gao ◽  
Jianhong Peng ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Oxygen Vacancies ◽  
Light Irradiation ◽  
Solar Light ◽  
No Removal ◽  
La Doping ◽  
Simulated Solar Light ◽  
Solar Light Irradiation ◽  
La Doped

La3+-Doped ZnWO4 nanorods were prepared via a hydrothermal method for the photocatalytic NO removal under simulated solar light irradiation.

Sign in / Sign up

Export Citation Format

Share Document