Visible light responsive mesoporous graphene–Eu2O3/TiO2 nanocomposites for the efficient photocatalytic degradation of 4-chlorophenol

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 35024-35035 ◽  
Author(s):  
Mallanaicker Myilsamy ◽  
Mani Mahalakshmi ◽  
Nallasivam Subha ◽  
Ariyamuthu Rajabhuvaneswari ◽  
Velayutham Murugesan
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Specific Surface ◽  
Photocatalytic Degradation ◽  
Surface Area ◽  
Specific Surface Area ◽  
Red Shift ◽  
Transfer Efficiency ◽  
Co Doped

Graphene and europium co-doped on TiO2 nanocomposites synergistically enhanced the photocatalytic degradation of 4-chlorophenol under visible light due to the enhanced specific surface area with red shift and improved charge transfer efficiency.

Amine coupled ordered mesoporous (Co–N) co-doped TiO2: a green photocatalyst for the selective aerobic oxidation of thioether

2017 ◽  
Vol 7 (18) ◽  
pp. 4182-4192 ◽  
Author(s):  
Mingming Zou ◽  
Lu Feng ◽  
Tiju Thomas ◽  
Minghui Yang
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Aerobic Oxidation ◽  
Doped Tio2 ◽  
Ordered Mesoporous ◽  
Selective Aerobic Oxidation ◽  
Co Doped

Selective aerobic oxidation (conversion ∼76.4%) of thioether to sulfoxide is achieved using triethylamine-coupled mesoporous Co–N–TiO2 (specific surface area: 124 m2 g−1) visible-light photocatalysts.

One-Pot Fabrication of K-Doped g-C3N4/SiO2Composite with Enhanced Photocatalytic Activity for Degradation of Tetracycline

2021 ◽  
Vol 43 (2) ◽  
pp. 124-124
Author(s):  
Min keng He Min keng He ◽  
Jin Zhang Jin Zhang ◽  
Fang yan Chen Fang yan Chen ◽  
Ke keShu Ke keShu ◽  
Yu bin Tang Yu bin Tang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Photocatalytic Degradation ◽  
Surface Area ◽  
Specific Surface Area ◽  
Organic Contaminants ◽  
Raw Materials ◽  
Thermal Polymerization ◽  
One Pot

K-doped g-C3N4/SiO2composite (SiO2/K-CN) was synthesized by a facile thermal polymerization with potassium chloride, melamine and nano-silica as raw materials. The as-prepared SiO2/K-CN was characterized by various measures. The photocatalytic activity of SiO2/K-CN was tested via the photocatalytic degradation of tetracycline under visible-light irradiation. The results showed that the specific surface area of SiO2/K-CN catalyst was 28.16m2/g, which is larger than that of pristine K-doped g-C3N4. Both K-doping and silica-combination can reduce the recombination rate of photo-generated electrons-holes pairs and broaden the region of visible light-harvesting. Compared with the pristine K-doped g-C3N4 and composite SiO2/g-C3N4, SiO2/K-CN exhibits distinctly higher photocatalytic activity for degradation of tetracycline. The enhanced photocatalytic performance of SiO2/K-CN is attributed to the increased specific surface area and the synergistic effect of K-doping and silica-combination in both accelerating separation of charged carries and improving visible light-absorption. During photocatalytic degradation of tetracycline, superoxide radicals play the most important role, followed by holes.SiO2/K-CN complex has excellent stability and shows promising application in photocatalytic degradation of organic contaminants in water.

Preparation and Photocatalytic Properties of Nanosized La3+ and Co2+ Co-Doped TiO2 by Microemulsions

2007 ◽  
Vol 336-338 ◽  
pp. 1943-1945
Author(s):  
Wei Liang Liu ◽  
Dan Li Lu ◽  
Chang Chun Ge ◽  
Jian Hua Chen ◽  
Zhi Ping He
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Uv Light ◽  
Pure Tio2 ◽  
Doped Tio2 ◽  
Co Doped

La3+ and Co2+ co-doped titania nanoparticles were prepared from reacting TiOSO4, La(NO3)3 and Co(NO3)2 with NH4OH in water/Triton X-100/n-hexanol/cyclohexane microemulsions. The structure, surface morphology and the specific surface area of the samples were characterized. The photocatalytic efficiency of as-prepared TiO2 was tested by photodegrading methyl orange. The results showed that doping with La3+ and Co2+ could suppress the growth of TiO2 grains and increase the specific surface area; When the calcination temperature increased from 300°C to 900°C, the average crystallite size of the particles increased from 7.3nm to 35.6 nm andthe specific surface area of the particles decreased rapidly from 205.5m2/g to 41.2m2/g. The synthesized amorphous particles wer transformed into anatase phase at 300°C, and further into rutile phase at 900°C. UV-Vis diffuse reflectance spectrum revealed that La3+ and Co2+ co-doped TiO2 absorbed UV light and visible light, while pure TiO2 could only absorb UV light. In the experiments of photodegrading methyl orange, it was proved that La3+ and Co2+ co-doped TiO2 had high photocatalytic activity under UV light and visible light, while pure TiO2 showed photocatalytic activity just under UV light.

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.

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.

Preparation, Characterization and Visible-Light Photocatalytic Properties of BiOCl/BiOI Nanocomposites

2012 ◽  
Vol 586 ◽  
pp. 10-17 ◽  
Author(s):  
Kai Jin Huang ◽  
Hou Guang Liu ◽  
Fang Li Yuan ◽  
Chang Sheng Xie
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Quantum Efficiency ◽  
Specific Surface Area ◽  
Light Absorption ◽  
Critical Factor ◽  
Photocatalytic Properties ◽  
Impregnation Method ◽  
Visible Light Photocatalytic

BiOCl/BiOI nanocomposites were synthesized using a thermal impregnation method for the first time. The intense visible-light absorption and large specific surface area gave 4wt.％BiOCl/BiOI nanocomposites the best visible-light photocatalytic properties among all the catalysts for the photodegradation of methyl orange,about 78％ after 2 h. But decreased activities were obtained with the increase of BiOCl content in the nanocomposites. Considering the light absorption,specific surface area and the quantum efficiency, the high recombination of the photoinduced electron-hole pairs of the catalysts that lowed the quantum efficiency was believed to be the critical factor for their decreased photocatalytic activities.

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