Simultaneous excitation of PdCl2 hybrid mesoporous g-C3N4 molecular/solid-state photocatalysts for enhancing the visible-light-induced oxidative removal of nitrogen oxides

Zhang, Zizhong; Xu, Mukun; Ho, Wingkei; Zhang, Xianwen; Yang, Zhenya; Wang, Xuxu

doi:10.1016/j.apcatb.2015.11.034

Cited by 38 publications

(12 citation statements)

References 42 publications

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“…No other impurities are found in Figure A. The XPS peaks of g-C 3 N 4 at 288.4 and 284.8 eV can be assigned to C 1s in Figure B, and they may result from the C–N structure in the g-C 3 N 4 and the C standard peak, respectively. The C 1s peaks of CG15 are fully consistent with those of g-C 3 N 4 in Figure B, indicating C 60 added to g-C 3 N 4 does not affect the C 1s electronic structure of g-C 3 N 4 because of the mechanical mixing of C 60 and g-C 3 N 4 .…”

Section: Results and Discussionmentioning

confidence: 93%

Fullerenes/Graphite Carbon Nitride with Enhanced Photocatalytic Hydrogen Evolution Ability

Song

Zhang

2016

J. Phys. Chem. C

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Graphite carbon nitride (g-C 3 N 4 ) is an excellent photocatalytic hydrogen evolution material by water splitting, but enhancing its photocatalytic activity and stability is still a big challenge. In this study, by utilizing the super ability of fullerenes (C 60 ) to attract electrons, we synthesized C 60 /g-C 3 N 4 photocatalytic composite materials with superior electronic separation efficiency. The addition of C 60 greatly improves the photocatalytic hydrogen evolution ability of g-C 3 N 4 for water splitting under visible light radiation. The highest hydrogen evolution amount reached 2268.6 μmol/g over 15 mg/L C 60 /g-C 3 N 4 after 10 h, which is 50.1× that of g-C 3 N 4 under the same water splitting condition. The hydrogen evolution amount over 15 mg/L C 60 /g-C 3 N 4 in the 0.2 mol/L K 2 HPO 4 system is 4161 μmol/g, indicating the addition of K 2 HPO 4 boosts the activity of C 60 /g-C 3 N 4 . The apparent quantum yield after 76 h was about 5.8%. The long-term photolysis water reaction for 76 h with rising photocatalytic activity exhibits that the C 60 /g-C 3 N 4 has excellent stability in water spitting. We can regulate the photocatalytic activity of C 60 /g-C 3 N 4 by changing the C 60 concentration. Photoluminescence spectrum proves the super ability of C 60 to attract electrons on the surface of C 60 /g-C 3 N 4 . Thus, C 60 promotes electron separation efficiency on the surface of g-C 3 N 4 and significantly enhances photocatalytic hydrogen evolution ability of g-C 3 N 4 .

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Section: Results and Discussionmentioning

confidence: 93%

Fullerenes/Graphite Carbon Nitride with Enhanced Photocatalytic Hydrogen Evolution Ability

Song

Zhang

2016

J. Phys. Chem. C

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“…For the XPS C 1s spectra of Pd–chitin- T shown in Figure a, three deconvolved peaks located at 284.5, 286.5, and 288.2 eV can be attributed to carbon atoms in the form of C–C, C–O/C–N, and N–CO, − which are similar to the XPS C 1s spectrum of pure chitin. The XPS N 1s spectra of Pd–chitin- T can be deconvolved into two peaks of N-(C) 3 and C–N–H located at 399.7 and 400.8 eV respectively . It can be observed that the proportion of N species belonging to C–N–H slightly increases along with the increase of reduction temperature, mainly resulting from the deacetylation of chitin at higher temperature.…”

Section: Resultsmentioning

confidence: 97%

“…8 Wang and co-workers use K + to adjust the selectivity of the Pd catalyst in the conversion of phenol to cyclohexanone. 9 Some reports also utilize a functionalized support involving Lewis base sites to improve the selectivity of active palladium nanoparticles, such as Pd/g-C 3 N 4 , 10 Pd−PANI/CNT (polyaniline-functionalized carbon-nanofiber-supported palladium) 11 and Pd/MIL-101(MIL-101 is a kind of MOF). 12 All these systems can achieve high conversion of phenol and excellent selectivity of cyclohexanone with molecular hydrogen as reducing reagent.…”

Section: ■ Introductionmentioning

confidence: 99%

Palladium Nanoparticles Anchored on Sustainable Chitin for Phenol Hydrogenation to Cyclohexanone

Zhao

Zhang

Liu

et al. 2020

ACS Sustainable Chem. Eng.

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A kind of natural, sustainable, and abundant biomass, chitin, is used as support to load palladium nanoparticles catalyst (Pd−chitin) for the transfer hydrogenation of phenolic compounds to ketones in HCOONa solution. The appropriate reduction temperature in hydrogen atmosphere is a key factor to improve the coordination between oxygen-containing groups and palladium nanoparticle, which prevents palladium nanoparticles leaching during the reaction so that Pd−chitin-150 exhibits good recycling stability. More importantly, Pd−chitin-150 can be fabricated into a PTFE tube with 2 mm inner diameters as a kind of monolithic catalyst, achieving the continuous production of cyclohexanone by feeding the mixture of phenol and HCOONa solution. The functions of sodium introduced during the preparation of catalyst are researched by H 2 -TPR, CO−DRIFT, and DFT calculations, which facilitate the reduction of palladium and increase the catalytic activity for phenol hydrogenation and selectivity to cyclohexanone.

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“…1). On the surface pre-treated with ultra-pure water the expected Pd (3d) doublet is present with the 3d 5/2 peak at 338 eV approximately 0.2 eV higher than is typical of PdCl 2 (Figure S1 and References [16][17][18]). There is also a single chlorine state present with the Cl(2p 3/2 ) peak at 198.4 eV corresponding to a metal coordinated chloride and this is the first clue that palladium chloride behaves differently to gold.…”

Section: Nucleation and Deposition Of Palladium From Palladium Chloridementioning

confidence: 96%

Investigating the Effects of Surface Adsorbates on Gold and Palladium Deposition on Carbon

et al. 2021

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Surface functional groups have a strong influence on the deposition and final state of nanoparticles adsorbed on to the surface, a role discussed by Professor Spencer in his work. This tribute to Spencer explores the formation of hydroxyls, thiosulfates, sulfites and sulfur atoms on carbon (HOPG) surfaces and their effect on the deposition of gold and palladium from aqueous solutions. Hydroxyls formed from ammonium hydroxide treatment have identical behaviour to those formed by acid treatment, and gold adsorption from Au3+ solutions gives Au0 initially, with Au3+ formed at higher concentrations on these surfaces. In contrast, palladium adsorption is hindered by the presence of the hydroxyls and there is no indication of any reduction to the metallic state. Ammonium thiosulfate adsorbs dissociatively from aqueous solutions on HOPG if the surface is pre-activated by the presence of surface hydroxyls. At low concentrations of ammonium thiosulfate, adsorbed sulfite and sulfur are formed in equimolar concentrations whereas adsorption of high concentrations of ammonium thiosulfate gives some degree of molecular adsorption, with evidence in XP spectra for an ammonium ion and a sulfur 2p peak at 282.9 eV attributed to the undissociated thiosulfate ion. Both sulfur and the sulfite are stable at the surface in neutral solutions but the sulfite desorbs when treated with acidified solutions (~ pH ≤ 6). These two groups are also stable at 373 K but begin to desorb by 473 K. Exposure to a weak chloroauric acid solution causes the desorption of the sulfite and formation of a gold species with an XP binding energy of 84.6 eV; we cannot determine from the present data whether this peak is due to a Au(I) state or very small nanoparticles of Au(0). Graphic Abstract

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Simultaneous excitation of PdCl2 hybrid mesoporous g-C3N4 molecular/solid-state photocatalysts for enhancing the visible-light-induced oxidative removal of nitrogen oxides

Cited by 38 publications

References 42 publications

Fullerenes/Graphite Carbon Nitride with Enhanced Photocatalytic Hydrogen Evolution Ability

Fullerenes/Graphite Carbon Nitride with Enhanced Photocatalytic Hydrogen Evolution Ability

Palladium Nanoparticles Anchored on Sustainable Chitin for Phenol Hydrogenation to Cyclohexanone

Investigating the Effects of Surface Adsorbates on Gold and Palladium Deposition on Carbon

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