Preparation and photocatalytic ability of highly defective carbon nanotubes

Luo, Yong; Yao-fu, Heng; Dai, Xiaojun; Chen, Wenquan; Li, Jialin

doi:10.1016/j.jssc.2009.07.010

Cited by 47 publications

(23 citation statements)

References 41 publications

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“…7. It was found that the pore volume of all of the activated MWNTs increased after the CO 2 activation process, as expected [33]. Moreover it was observed that the micropore size distribution in both the Pt-Acti-10 and Pt-Acti-20 samples shifted to the left side.…”

Section: Intensitysupporting

confidence: 80%

Influence of CO2 activation on hydrogen storage behaviors of platinum-loaded activated carbon nanotubes

Lee

Park

2010

Journal of Solid State Chemistry

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Section: Intensitysupporting

confidence: 80%

Influence of CO2 activation on hydrogen storage behaviors of platinum-loaded activated carbon nanotubes

Lee

Park

2010

Journal of Solid State Chemistry

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“…In CNTs, the G band indicates the presence of crystalline graphitic carbon and it is related to the GRA tangential E 2 g Raman active mode, due to two atoms in the GE unit cell vibrating tangentially one against the other (Su et al, 2008;Luo et al, 2009). The D band is usually attributed to the presence of amorphous or disordered carbon in the CNT samples (Datsyuk et al, 2008), and is related to the phonon region close to the k-point GRA Brillouin zone.…”

Section: Resultsmentioning

confidence: 99%

Comparison as Effective Photocatalyst or Adsorbent of Carbon Materials of One, Two, and Three Dimensions for the Removal of Reactive Red 2 in Water

Pérez-RamírezEduardo

Rosa-ÁlvarezGuadalupe

Salas

et al. 2015

Environmental Engineering Science

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Photocatalytic degradation and removal by adsorption of the Reactive Red 2 (RR2) dye in the presence of different pristine and functionalized one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) carbon structures were investigated and compared, considering also the loading of catalyst/adsorbent. Previous to photocatalytic and adsorption evaluation, all carbon materials were characterized to verify functionalization, structural changes, and surface properties useful in the removal of this pollutant in water. Materials were analyzed by Raman and infrared spectroscopies, transmission electron microscopy, and besides, the pH of the point of zero charge (pH pzc ) was determined by potentiometric titrations, and band gap by ultraviolet-visible spectroscopy through Tauc plot. Removal of RR2 increases with the load of carbon materials. One-dimensional materials showed better performance in the decolorization of RR2 dye, removing the whole color of the solution. RR2 removal values obtained by the photocatalytic and adsorption processes are very similar. Thus, the adsorption process predominates over the photocatalytic activity, only the samples of graphene and graphene oxide present slight photocatalytic activity. The adsorption process was strongly influenced by the carbon material dimension. However, other factors like surface oxygenated groups, surface area, and the shape of the carbon structures, as well as the structure and nature of the dye also play an important role in this process. Experimental adsorption data of all carbon materials were best fitted to pseudo second-order kinetic model, and, it is concluded that physisorption with strong interaction is the process by which carbon materials adsorb to the dye. Thus, the mechanism of RR2 adsorption on carbon materials is by the aromatic rings of the RR2 and p delocalized electrons on carbon materials.

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“…Such atomic vacancies are either already present on the graphite surfaces or can be created during the heat treatment step [81,83]. During heat treatment under inert atmosphere, carbothermic reaction causes desorption of oxygen functional groups along with creation of vacancy defects [83]. It has also been observed earlier that heattreated Fe-N x catalysts showed higher activity when supported on carbon that was previously treated in concentrated inorganic acids [52].…”

Section: Delta-mu (δμ) Studiesmentioning

confidence: 88%

“…This is schematically depicted in Figure 9(c) [79,80]. Atomic defects such as monovacancy and divacancy on microporous carbon and carbon nanotubes are known to thermodynamically exist or can be induced via various chemical or physical processes [81][82][83][84][85]. The presence of a monovacancy in carbon atom creates three dangling bonds whereas divacancies create four dangling bonds.…”

Section: Delta-mu (δμ) Studiesmentioning

confidence: 99%

“…Consequently, these nitrogen-doped sites constitute defective pockets for metal coordination. Such atomic vacancies are either already present on the graphite surfaces or can be created during the heat treatment step [81,83]. During heat treatment under inert atmosphere, carbothermic reaction causes desorption of oxygen functional groups along with creation of vacancy defects [83].…”

Section: Delta-mu (δμ) Studiesmentioning

confidence: 99%

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Fundamental Mechanistic Understanding of Electrocatalysis of Oxygen Reduction on Pt and Non-Pt Surfaces: Acid versus Alkaline Media

Ramaswamy

Mukerjee

2012

Advances in Physical Chemistry

333

255

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Complex electrochemical reactions such as Oxygen Reduction Reaction (ORR) involving multi-electron transfer is an electrocatalytic inner-sphere electron transfer process that exhibit strong dependence on the nature of the electrode surface. This criterion (along with required stability in acidic electrolytes) has largely limited ORR catalysts to the platinum-based surfaces. New evidence in alkaline media, discussed here, throws light on the involvement of surface-independent outer-sphere electron transfer component in the overall electrocatalytic process. This surface non-specificity gives rise to the possibility of using a wide-range of non-noble metal surfaces as electrode materials for ORR in alkaline media. However, this outer-sphere process predominantly leads only to peroxide intermediate as the final product. The importance of promoting the electrocatalytic inner-sphere electron transfer by facilitation of direct adsorption of molecular oxygen on the active site is emphasized by using pyrolyzed metal porphyrins as electrocatalysts. A comparison of ORR reaction mechanisms between acidic and alkaline conditions is elucidated here. The primary advantage of performing ORR in alkaline media is found to be the enhanced activation of the peroxide intermediate on the active site that enables the complete four-electron transfer. ORR reaction schemes involving both outer-and inner-sphere electron transfer mechanisms are proposed.

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Preparation and photocatalytic ability of highly defective carbon nanotubes

Cited by 47 publications

References 41 publications

Influence of CO2 activation on hydrogen storage behaviors of platinum-loaded activated carbon nanotubes

Influence of CO2 activation on hydrogen storage behaviors of platinum-loaded activated carbon nanotubes

Comparison as Effective Photocatalyst or Adsorbent of Carbon Materials of One, Two, and Three Dimensions for the Removal of Reactive Red 2 in Water

Fundamental Mechanistic Understanding of Electrocatalysis of Oxygen Reduction on Pt and Non-Pt Surfaces: Acid versus Alkaline Media

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