Novel P O codoped g-C3N4 with large specific surface area: Hydrothermal synthesis assisted by dissolution–precipitation process and their visible light activity under anoxic conditions

2015 ◽  
Vol 357 ◽  
pp. 131-138 ◽  
Author(s):  
Huiqiang Ma ◽  
Yang Li ◽  
Shuang Li ◽  
Na Liu
Keyword(s):  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Precipitation Process ◽  
Large Specific Surface Area ◽  
Anoxic Conditions ◽  
Light Activity

Preparation of Nitrogen-Deficient Graphitic Carbon Nitride with a Large Specific Surface Area by Melt Pretreatment and Its Photocatalytic Performance

NANO ◽  
2020 ◽  
Vol 15 (06) ◽  
pp. 2050079
Author(s):  
Xuelei Li ◽  
Jinfeng Bai ◽  
Jiaqi Li ◽  
Chao Li ◽  
Junru Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Nitride ◽  
Mesoporous Structure ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Large Specific Surface Area ◽  
X Ray

In this study, nitrogen-deficient graphitic carbon nitride (M-LS-g-C3N4) with a mesoporous structure and a large specific surface area was obtained by calcination after melt pretreatment using urea as a precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption, X-ray photoelectron spectroscopy (XPS), UV-Vis, ESR and photoluminescence (PL) were used to characterize the structure, morphology and optical performance of the samples. The TEM results showed the formation of a mesoporous structure on the 0.1[Formula: see text]M-LS-g-C3N4 surface. The porous structure led to an increase in the specific surface area from 41.5[Formula: see text]m2/g to 124.3[Formula: see text]m2/g. The UV-Vis results showed that nitrogen vacancies generated during the modification process reduced the band gap of g-C3N4 and improved the visible light absorption. The PL spectra showed that the nitrogen defects promoted the separation of photogenerated electron–hole pairs. In the visible light degradation of methyl orange (MO), the reaction rate constant of 0.1[Formula: see text]M-LS-g-C3N4 reached 0.0086[Formula: see text][Formula: see text], which was 5.05 times that of pure g-C3N4. Superoxide radicals and photogenerated holes were found to be the main active species in the reaction system. This study provides an efficient, green and convenient means of preparing graphitic carbon nitride with a large specific surface area.

Enhanced photocatalytic activity of a hollow TiO2–Au–TiO2 sandwich structured nanocomposite

RSC Advances ◽  
2016 ◽  
Vol 6 (23) ◽  
pp. 18958-18964 ◽  
Author(s):  
Qianqian Ding ◽  
Yunxia Zhang ◽  
Guozhong Wang ◽  
Hongjian Zhou ◽  
Haimin Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Large Specific Surface Area

The hollow mesoporous TiO2–Au–TiO2 nanospheres with stability, large specific surface area can enhance visible-light-induced photocatalytic activity.

scholarly journals Hydrothermal Synthesis of 1T-MoS2/Pelagic Clay Composite and Its Application in the Catalytic Reduction of 4-Nitrophenol

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7020
Author(s):  
Nan Li ◽  
Qiwei Sun ◽  
Peiping Zhang ◽  
Shubo Jing
Keyword(s):  
Hydrothermal Synthesis ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Fine Particles ◽  
Catalytic Reduction ◽  
Large Specific Surface Area ◽  
Mos2 Nanosheets ◽  
Pelagic Clay

Pelagic clay is an emerging marine resource with strong hydrophilicity, fine particles and a large specific surface area. In this work, a 1T-MoS2/pelagic clay composite was fabricated by hydrothermal synthesis. In the composite, 1T-MoS2 nanosheets are evenly dispersed on the surface of the clay minerals, significantly reducing the agglomeration of MoS2. Compared with pure 1T-MoS2, the 1T-MoS2 nanosheets generated on the surface of pelagic clay have significantly smaller lateral dimensions and thicknesses. Moreover, the specific surface area is much larger than that of the pure 1T-MoS2 nanosheets fabricated by the same method, indicating that the active sites of the MoS2 sheets are fully exposed. In addition, the composite exhibited excellent hydrophilicity, leading to a high dispersibility in aqueous solutions. In this work, the composite was used as a catalyst in the reduction of 4-nitrophenol (4-NP), and the conversion of 4-NP reached up to 96.7%. This result shows that the 1T-MoS2/pelagic clay composite is a promising catalyst in a variety of reactions.

Influence of Pressure to Morphology of TiO2 Nanofibers Prepared by Microwave-Assisted Synthesis Method

2019 ◽  
Vol 800 ◽  
pp. 132-137
Author(s):  
Reinis Drunka ◽  
Jānis Grabis ◽  
Aija Krumina
Keyword(s):  
Hydrothermal Synthesis ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Synthesis Method ◽  
Microwave Assisted Synthesis ◽  
Large Specific Surface Area ◽  
High Quality ◽  
Microwave Assisted ◽  
Temperature And Pressure

Microwave-assisted hydrothermal synthesis of TiO2 nanofibers under various temperature and pressure conditions were done in this research. High quality TiO2 nanofiber coatings where obtained when temperature was in range 240 – 245 °C and pressure was 27.3 – 29.1 bar. Obtained TiO2 nanofiber coatings are with a specific surface area of ​​151.5 to 158.9 m2· g-1 before calcination. Comparing with nanopowder photocatalysts nanofiber coatings photocatalysts can be much easier removed from solution after the photocatalysis process. Such coatings with relative large specific surface area are with higher potential application in industry.

Preparation and Visible Light Activity of Co-Doped Mesoporous TiO2 Photocatalyst

2013 ◽  
Vol 664 ◽  
pp. 690-695 ◽  
Author(s):  
Yi Dan Han ◽  
Lan Bo Di ◽  
Kai Wang ◽  
Xiu Ling Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Doping Amount ◽  
Xps Spectra ◽  
Bet Analysis ◽  
Light Activity ◽  
Co Doped

Co-doped mesoporous TiO2photocatalyst was successfully prepared by an ionic liquid modified sol-gel method from TBOT and Co(NO3)2·6H2O. The Co-doped mesoporous TiO2samples were characterized by TG-DSC, XRD, XPS, BET, UV-Vis and TEM, respectively. TG-DSC and XRD results showed that the mesoporous TiO2samples exhibited high thermal stability, and the samples calcined at 650 oC indicated well-crystallized anatase structure. XPS spectra proved the Co3O4structure of Co in Co-doped mesoporous samples. Large specific surface area was shown from the BET analysis, and the largest specific surface area was obtained when the Co-doping amount was 0.3%. UV-Vis DRS spectra showed that all of the samples exhibited obvious absorption in the visible light range. Photocatalytic activity of the samples was evaluated by photodegradation of MB under visible light (λ>420 nm). Co-doped mesoporous TiO2exhibited high photocatalytic activity for MB oxidation, and the 0.3% Co/TiO2sample showed the highest visible light activity.

scholarly journals Construction of SnO2/graphene-like g-C3N4 with enhanced visible light photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 36101-36111 ◽  
Author(s):  
Haiyan Ji ◽  
Yamin Fan ◽  
Jia Yan ◽  
Yuanguo Xu ◽  
Xiaojie She ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Hydrothermal Method ◽  
Surface Area ◽  
Specific Surface Area ◽  
Photocatalytic Performance ◽  
Large Specific Surface Area ◽  
Environmental Friendly ◽  
Visible Light Photocatalytic

2D/2D SnO2/GL-C3N4 photocatalysts with large specific surface area and high coupling heterointerface extent were synthesized by an environmental friendly hydrothermal method, showing excellent photocatalytic performance on RhB degradation.

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