Ultra small gold nanoparticles–graphitic carbon nitride composite: an efficient catalyst for ultrafast reduction of 4-nitrophenol and removal of organic dyes from water

Bhowmik, Tanmay; Kundu, Manas Kumar; Barman, Sudip

doi:10.1039/c5ra04913j

Cited by 116 publications

(57 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The 0.162 mmol HAuCl 4 and 0.53 mmol NaBH 4 solutions were used for the synthesis of 88 wt% Au-aerogel-CN x whereas 0.235 mmol of HAuCl 4 and 0.79 mmol NaBH 4 solutions were used for 92 wt% Au-aerogel-CN x . The gold nanoparticles supported on CN x were produced by only ultrasonic treatment of HAuCl 4 (0.147 mmol) in presence of CN x sheets (5 mg) without any reducing agent 26 .…”

Section: Preparation Of Au-aerogel-cn X Compositementioning

confidence: 99%

“…However, when there is no NaBH 4 used reduction of HAuCl 4 due to ultrasonication, produces gold atoms slowly, and gold particles are physically adsorbed on the surface of CN x sheets leading to precipitation of AuNPs-CN x composite. On evaporation of aqueous solution of AuNPs-CN x composite on a solid substrate, first 2D sheets of CN x sheets are formed and nucleation at nitrogen atom, followed by growth occurs to form assembly of gold nanoparticles on CN x sheets 26 .…”

Section: Characterization Of Au Aerogel Compositesmentioning

confidence: 99%

See 1 more Smart Citation

Gold aerogel supported on graphitic carbon nitride: an efficient electrocatalyst for oxygen reduction reaction and hydrogen evolution reaction

2015

Self Cite

View full text Add to dashboard Cite

Fabrication of high surface area interconnected porous network of metallic nanomaterials is important for their applications in various fields such as catalysis, sensors, and electrochemistry. Here we report a facile bottom up synthesis of high surface area and porous, gold aerogel supported on carbon nitride sheets (CNx). The reduction of HAuCl4 in presence of carbon nitride nanosheets using sodium brohydride and ultrasonic treatment produces gold aerogel supported on carbon nitride (Au-aerogel-CNx). When the reduction of HAuCl4 in presence CNx nano sheets was done only with ultrasonication, highly dispersed ultra small ( ~2 nm) gold nanoparticles on CNx sheets (AuNPs-CNx) were formed. The Au aerogel supported on CNx sheets was well characterized by powder X-ray diffraction, tunneling electron microscopy, selected area electron diffraction, energy dispersive X-ray spectroscopy, scanning electron microscopy, UV-Visible and Xray photo electron spectroscopic methods. The Au-aerogel-CNx and AuNPs-CNx composites exhibited superior electro catalytic activity towards oxygen reduction reaction (ORR) in alkaline and acidic media. The Au-aerogel-CNx composite show ORR onset potentials at 0.92 V and 0.43 V (Vs RHE) in 0.5 M KOH and H2SO4 solution. The four electron oxygen reduction proceess occurs at these supported catalysts in both alkaline and acidic media. In alkaline (KOH) medium the onset potential at Au-aerogel-CNx is more positive ( ~ 30 mV) than that of commercial Pt/C catalyst. The composites display excellent methanol tolerance and comparable durability with commercial Pt/C. Furthermore, the Au-aerogel-CNx composites exhibited high catalytic activity for hydrogen reduction reaction (HER) with small onset potential of -30 mV and a Tafel slope of 53 mV dec -1 in acidic medium. At a small Au loading of 0.130 mg cm -2 , this catlyst also exhibit a current density of 10 mA cm -2 at a low overpotential of -185 mV with an excellent stability. The ORR and HER performaneces on porous, Au-aerogel-CNx composites is better than that of AuNPs-CNx catalyst and commercial flat gold electrode. The superior ORR and HER activity at Au-aerogel-CNx composite are originated from the unique synergistic effects between porous Au network and carbon nitride (CNx) support. Please do not adjust margins Please do not adjust margins approaches are available in literature for synthesis of different non metal aerogel such as carbon aerogel 11 , silica aerogel 12 , organic-inorganic hybrid 13 , metal oxide 14 , and metal chalcogenides 15 . But only few methods are available for the production of metal aerogel 8,16,17,18 . For example, Eychmüller and coworkers 8,16 have reported synthesis for monometallic, bi-metallic and composite aerogels based on controlled aggregation of metal nanoparticles using controllable destabilization and spontaneous gelation methods. Leventis and his co-workers 17,18 developed methods for synthesis of different metallic (Fe, cu, Ni, Co) aerogels by nanosmelting (sol-gel method) of hybrid polymer-metal oxide composit...

show abstract

Section: Preparation Of Au-aerogel-cn X Compositementioning

confidence: 99%

Section: Characterization Of Au Aerogel Compositesmentioning

confidence: 99%

Gold aerogel supported on graphitic carbon nitride: an efficient electrocatalyst for oxygen reduction reaction and hydrogen evolution reaction

2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…3 However, the low photocatalytic efficiency is still one of the most important factors restricting the practical application for the g-C 3 N 4 . Various strategies have been developed to improve the photocatalytic performance for g-C 3 N 4 , such as metal doping, [4][5][6][7] non-metal doping, [8][9][10][11][12] decoration with noble metal, [13][14][15] semiconductor [16][17][18][19] or graphene, [20][21][22] low-dimension nanostructure synthesis, 23,24 etc. 25,26 Among all the strategies to enhance the activity of photocatalyst, surface/interface modulation is one of the intensive research methods.…”

Section: Introductionmentioning

confidence: 99%

In situ surface alkalinized g-C₃N₄ toward enhancement of photocatalytic H₂ evolution under visible-light irradiation

et al. 2016

View full text Add to dashboard Cite

Surface-alkalinization over g-C3N4 was realized by an in-situ synthesis approach of introducing KCl and NH4Cl during the polymerization of melamine. The characterizations of Fourier transform-infrared spectrum, X-ray photoelectron spectrum, and electron spin resonance spectrum over the sample synthesized in presence of KCl/NH4Cl and other reference samples indicated that the K ions played an essential role in breaking the periodic chemical structure of g-C3N4 and meanwhile the trace amount of H2O in melamine could supply OH ions to graft hydroxyl groups. The NH4Cl mainly contributed to exfoliation of layered g-C3N4 particles and pushing negative shift of conduction-band level based on the measurements of BET surface area and valence-band X-ray photoelectron spectrum. An optimal sample, g-C3N4-KCl/0.1gNH4Cl (CN-KCl/0.1gNH4Cl), achieved a more than 14-fold enhancement in photocatalytic H2 evolution under visible-light irradiation compared with the pristine g-C3N4. The enhanced photocatalytic efficiency could be attributed to that the surface hydroxyl groups and the more negative conduction-band level can promote separation of photocarriers and offer a stronger potential for water reduction, respectively.

show abstract

“…Hence, various scavengers were introduced to react with active species to evaluate their contributions on the photodegradation of MO by the changes of degradation efficienies. In the present study, several scavengers were used, potassium iodide (KI) were adopted as the scavengers for h + [35], iso-propanol for ·OH [36], and 1, 4-benzoquinone for ·O 2 − [37]. The above scavengers were added to the pollutant solutions together with CS1 before irradiation.…”

Section: Photocatalytic Propertiesmentioning

confidence: 99%

Facile synthesis of CdS nanorods with enhanced photocatalytic activity

Chen

Jia

Cao

et al. 2015

Ceramics International

View full text Add to dashboard Cite

Ultra small gold nanoparticles–graphitic carbon nitride composite: an efficient catalyst for ultrafast reduction of 4-nitrophenol and removal of organic dyes from water

Abstract: Synthesis of ultra-small gold particles on g-C3N4 sheets was reported. This Au–C3N4 composite exhibited superior catalytic activity toward reduction of 4-nitrophenol and adsorption, photocatalytic degradation of dyes.

Cited by 116 publications

References 70 publications

Gold aerogel supported on graphitic carbon nitride: an efficient electrocatalyst for oxygen reduction reaction and hydrogen evolution reaction

Gold aerogel supported on graphitic carbon nitride: an efficient electrocatalyst for oxygen reduction reaction and hydrogen evolution reaction

In situ surface alkalinized g-C₃N₄ toward enhancement of photocatalytic H₂ evolution under visible-light irradiation

Facile synthesis of CdS nanorods with enhanced photocatalytic activity

Contact Info

Product

Resources

About

Ultra small gold nanoparticles–graphitic carbon nitride composite: an efficient catalyst for ultrafast reduction of 4-nitrophenol and removal of organic dyes from water

Abstract: Synthesis of ultra-small gold particles on g-C3N4 sheets was reported. This Au–C3N4 composite exhibited superior catalytic activity toward reduction of 4-nitrophenol and adsorption, photocatalytic degradation of dyes.

Cited by 116 publications

References 70 publications

Gold aerogel supported on graphitic carbon nitride: an efficient electrocatalyst for oxygen reduction reaction and hydrogen evolution reaction

Gold aerogel supported on graphitic carbon nitride: an efficient electrocatalyst for oxygen reduction reaction and hydrogen evolution reaction

In situ surface alkalinized g-C3N4 toward enhancement of photocatalytic H2 evolution under visible-light irradiation

Facile synthesis of CdS nanorods with enhanced photocatalytic activity

Contact Info

Product

Resources

About

In situ surface alkalinized g-C₃N₄ toward enhancement of photocatalytic H₂ evolution under visible-light irradiation