Macroporous Carbon Nitride: Synthesis, Loading with Metal Nanoparticles and Catalytic Activity

Bai, Xinjiao; Cao, Tai; Cao, Chuanbao

doi:10.1166/sam.2012.1385

Cited by 4 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[17] In fact in contrast to metal derived photocatalysts, which we need more expensive metal salts for the synthesis, photocatalyst derived from P-CN can be easily synthesized in the laboratory by the thermal polycondensation of inexpensive precursors. The precursors so far explored for the synthesis of P-CN are melamine, [18] cyanamide, [19] dicyandiamide, [20] cyanuric chloride, [21] urea, [22] thiourea, [23] ethylenediamine with carbon tetrachloride, [24] and ammonium thiocyanate. [25] The P-CN derived from different precursors showed diverse morphology and even chemical structure.…”

Section: Introductionmentioning

confidence: 99%

Exploring The Effect of Precursors of Polymeric Carbon Nitride Nanosheets on their Photo and Electrocatalytic Applications

et al. 2020

View full text Add to dashboard Cite

In the present study, we have performed a case study to understand the ability of bulk polymeric carbon nitride (P‐CN) derived from various precursors such as urea, melamine, and dicyandiamide namely UCN, MCN and, DCN respectively via thermal condensation process and also their corresponding thermally exfoliated nanosheets such as TE_UCN, TE_MCN, and TE_DCN. Compared with the bulk P‐CN, all the thermally exfoliated samples retained higher surface area and shows superior photogenerated charge carrier transfer and separation. Among the thermally exfoliated P‐CN nanosheets, TE_UCN gives highly porous nanosheets with a specific surface area of 179 m2/g, and large band gap (3.01 eV). Despite its poor electronic band structure, the large surface area of TE_UCN has contributed more to the excellent photogenerated charge carrier separation, which resulted in their highest photocatalytic property against the degradation of an organic dye rhodamine B(RhB) under natural sunlight. The electrochemical experiments on all the three samples of nanosheets of P‐CN revealed that TE_UCN is the best electrode material for supercapacitors. TE_UCN displays excellent capacitance properties in 0.5 M H2SO4 electrolyte with a specific capacitance of 128.7 Fg−1. Finally, the electrocatalytic activity investigation of the samples of P‐CN nanosheets revealed that TE_DCN has more catalytic activity towards HER. This study demonstrates that texture, electrochemical capacitance, electro and photcatalytic properties of nanosheets of P‐CN can be improved by the judicial choice of the precursor molecules.

show abstract

Section: Introductionmentioning

confidence: 99%

Exploring The Effect of Precursors of Polymeric Carbon Nitride Nanosheets on their Photo and Electrocatalytic Applications

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[39,[45][46][47][48][49][50][51][52][53] The specific activity of these morphologies is typically increased by 3-10 fold compared to the bulk carbon nitride under visible light (≥ 400 nm) illumination. Of direct relevance to this work, carbon nitrides have also been integrated with oxides such as silica and titania to form photocatalytic composites for dye degradation, or to support catalytic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Pore confinement effects and stabilization of carbon nitride oligomers in macroporous silica for photocatalytic hydrogen production

Qiao

Mitchell

Coulson

et al. 2016

Carbon

View full text Add to dashboard Cite

An ordered macroporous host (mac-SiO2) has been used to prevent aggregation of layered photocatalysts based on carbon nitride. Using typical carbon nitride synthesis conditions, cyanamide was condensed at 550 o C in the presence and absence of mac-SiO2. Condensation in the absence of mac-SiO2 results in materials with structural characteristics consistent with the carbon nitride, melon, accompanied by ca. 2 wt% carbonization. For mac-SiO2 supported materials, condensation occurs with greater carbonization (ca. 6 wt%). On addition of 3wt% Pt cocatalyst photocatalytic hydrogen production under visible light is found to be up to 10 times greater for the supported composites. Time-resolved photoluminescence spectroscopy shows that excited state relaxation is more rapid for the mac-SiO2 supported materials suggesting faster electron-hole recombination and that supported carbon nitride does not exhibit improved charge separation. CO2 temperature programmed desorption indicates that enhanced photoactivity of supported carbon nitride is attributable to an increased surface area compared to bulk carbon nitride and an increase in the concentration of weakly basic catalytic sites, consistent with carbon nitride oligomers.

show abstract

“…Unlike the metal-containing photocatalysts that need expensive metal salts for preparation, g-C 3 N 4 photocatalyst can be facilely prepared by thermal polycondensation of cheap precursors [ 29 ]. These precursors generally used are the carbon- and nitrogen-rich organic compounds, such as dicyandiamide [ 30 ], melamine [ 16 , 31 ], urea [ 32 ], thiourea [ 33 ], cyanuric chloride [ 34 ], ethylenediamine with carbon tetrachloride [ 35 ], ammonium thiocyanate [ 36 ] and cyanamide [ 37 ]. For example, Dong et al employed a facile and eco-friendly approach to successfully fabricate nitrogen-rich g-C 3 N 4 layered nanostructure by directly heating thiourea in air at 550°C and found that the sulfur species in precursor could chemically control the formation of g-C 3 N 4 networks and accelerate the polymerization process of g-C 3 N 4 [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Synergic Effect between Adsorption and Photocatalysis of Metal-Free g-C3N4 Derived from Different Precursors

Zhao

et al. 2015

PLoS ONE

View full text Add to dashboard Cite

Graphitic carbon nitride (g-C3N4) used in this work was obtained by heating dicyandiamide and melamine, respectively, at different temperatures. The differences of g-C3N4 derived from different precursors in phase composition, functional group, surface morphology, microstructure, surface property, band gap and specific surface area were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-visible diffuse reflection spectroscopy and BET surface area analyzer, respectively. The photocatalytic discoloration of an active cationic dye, Methylene Blue (MB) under visible-light irradiation indicated that g-C3N4 derived from melamine at 500°C (CN-M500) had higher adsorption capacity and better photocatalytic activity than that from dicyandiamide at 500°C (CN-D500), which was attributed to the larger surface area of CN-M500. MB discoloration ratio over CN-M500 was affected by initial MB concentration and photocatalyst dosage. After 120 min reaction time, the blue color of MB solution disappeared completely. Subsequently, based on the measurement of the surface Zeta potentials of CN-M500 at different pHs, an active anionic dye, Methyl Orange (MO) was selected as the contrastive target pollutant with MB to reveal the synergic effect between adsorption and photocatalysis. Finally, the photocatalytic mechanism was discussed.

show abstract

Macroporous Carbon Nitride: Synthesis, Loading with Metal Nanoparticles and Catalytic Activity

Cited by 4 publications

References 0 publications

Exploring The Effect of Precursors of Polymeric Carbon Nitride Nanosheets on their Photo and Electrocatalytic Applications

Exploring The Effect of Precursors of Polymeric Carbon Nitride Nanosheets on their Photo and Electrocatalytic Applications

Pore confinement effects and stabilization of carbon nitride oligomers in macroporous silica for photocatalytic hydrogen production

Synergic Effect between Adsorption and Photocatalysis of Metal-Free g-C3N4 Derived from Different Precursors

Contact Info

Product

Resources

About