Role of surface phosphorus complexes on the oxidation of porous carbons

Valero-Romero, María José; García-Mateos, Francisco J.; Rodríguez‐Mirasol, J.; Cordero, Tomás

doi:10.1016/j.fuproc.2016.11.014

Cited by 108 publications

(92 citation statements)

References 49 publications

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“…The thermal treatment of AC delivers an increase in P content, Table 2, confirming that phosphorus is not lost from the surface of the activated carbon during thermal annealing, and only a minor increase in the presence of C-P-O bonds. Similar outcomes (i.e., reduced impact of thermal treatment in inert atmosphere) after thermal treatment of P-containing carbons can be found in our previous studies (Rosas et al, 2012;Berenguer et al, 2015;García-Mateos et al, 2015;Valero-Romero et al, 2017). Bulk P contents are in agreement with XPS determinations for AC and AC-G, while P seems to be more concentrated on the surface of AC-T (P XPS > P bulk ).…”

Section: Physicochemical Parameters Of Activated Carbonssupporting

confidence: 89%

“…In the case of AC, additional release of small quantities of CO at temperatures from 500 to 750 • C can be assigned to the presence of anhydrides (confirmed by the evolution of CO 2 in a temperature range of 450-650 • C, Figure 4B) and phenols/quinones (that decomposes in the form of CO at temperatures between 650 and 750 • C) (Román-Martínez et al, 1993;Figueiredo et al, 1999;Boehm, 2002). Water evolution during TPD from 650 up to 900 • C is also detected (H 2 O profiles not included for the sake of brevity), what has been proposed to be produced by the condensation of P-OH and saturated C atoms, forming C-P bonds (Valero-Romero et al, 2017). After the thermal treatment at 900 • C under inert atmosphere, anhydrides and phenols/quinones are no longer observed, and most of the CO evolution found in sample AC-T is related to the presence of C-O-P species.…”

Section: Physicochemical Parameters Of Activated Carbonsmentioning

confidence: 92%

“…In the CO profile, the main feature is the presence of a well-defined peak centered at temperatures around 850 • C, Figure 4A. This CO evolution has been identified as the thermal decomposition of C-O-P groups, which releases CO Valero-Romero et al, 2017). The maximum of the peak is centered ca.…”

Section: Physicochemical Parameters Of Activated Carbonsmentioning

confidence: 97%

“…After the thermal treatment at 900 • C under inert atmosphere, anhydrides and phenols/quinones are no longer observed, and most of the CO evolution found in sample AC-T is related to the presence of C-O-P species. We have already reported that the C-P bonds formed during the thermal treatment of P-containing activated carbons are prone to reoxidize at fast rate when they are again contacted with air, even at room temperature (Valero-Romero et al, 2017), what explains why the CO evolution related to the presence of C-O-P decomposition is seen in AC-T.…”

Section: Physicochemical Parameters Of Activated Carbonsmentioning

confidence: 99%

“…It is worth noting that the presence of stable phosphorous groups introduced during activation also confers to these carbonaceous solids high surface acidity (Bedia et al, 2010b) and oxidation resistance (Rosas et al, 2012), increasing the possibilities of these materials for applications in catalysis (Bedia et al, 2010a;Hita et al, 2016). The relevance of phosphorous groups on carbon reactivity has been demonstrated for the oxygen-carbon reaction (Valero-Romero et al, 2017) reported that the oxidation of P-containing carbons renders the preferential formation of oxygen-containing P surface groups through the oxidation of C-P to C-O-P bonds. Since C-O-P bonds are thermally stable up to 700 • C, the carbon-oxygen reaction is inhibited at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

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About the Role of Porosity and Surface Chemistry of Phosphorus-Containing Activated Carbons in the Removal of Micropollutants

et al. 2019

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The preparation of phosphorus-containing activated carbons and the effect of their surface chemistry and porosity on the performance as adsorbents of paracetamol are herein reported. A parent activated carbon is prepared by chemical activation of olive stones with phosphoric acid at 500 • C and impregnation weight ratio of 3:1. This carbon is thermal treated under inert atmosphere at 900 • C, producing porosity shrinkage, loss of 20% of surface area and less oxidized phosphorus groups. In addition, our knowledge about the redox behavior of P-containing groups has allowed the controlled gasification of the parent activated carbon in diluted air atmosphere, developing wide micropores and mesopores, increasing 40% the specific surface area and producing more oxidized phosphorus groups. Adsorption of a model micropollutant, paracetamol, has been conducted over these activated carbons by using diluted aqueous solutions (<10 mg L −1 ). Batch and small-scale column experiments confirmed that the presence of narrow microporosity and surface chemistry compatible with paracetamol improves the adsorption capacity, at the point of overcoming the potential effect of additional microporosity development. Moreover, the presence of a well-developed micro-and mesoporisity combined with a low surface acidity (that increases the affinity of the activated carbon surface and paracetamol) enhances the mass transfer rate of the adsorbent, improving the small-scale column performance parameters. To sum up, this study emphasizes the key role played by surface chemistry on the applicability of P-containing activated carbon as adsorbents. These results also confirm that controlled gasification at high temperatures of P-containing activated carbons is a useful method for improving their behavior in micropollutant abatement.

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Section: Physicochemical Parameters Of Activated Carbonssupporting

confidence: 89%

Section: Physicochemical Parameters Of Activated Carbonsmentioning

confidence: 92%

Section: Physicochemical Parameters Of Activated Carbonsmentioning

confidence: 97%

Section: Physicochemical Parameters Of Activated Carbonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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About the Role of Porosity and Surface Chemistry of Phosphorus-Containing Activated Carbons in the Removal of Micropollutants

et al. 2019

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Surface Chemistry Determined Electrochemical Sensing Performance of Red Phosphorus and Single Walled Carbon Nanotube Composites

Liu

Ling

Zeng

et al. 2022

Adv Funct Materials

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Red phosphorus (RP) is a promising electrochemical sensing material owing to its abundant surface groups and reactive sites. In this study, a sodium dodecyl sulfate-assisted phosphorus-amine approach is employed to tune surface chemistry of RP nanoparticles. During the transition of the polyphosphorusamine anion to RP, the cleavage of POP bond and the formation of POC bond are monitored by in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy. The formed POC bonds that are originated from the PO reactive sites are theoretically revealed with the density functional theory calculations, charge density difference, and X-ray photoelectron spectroscopy. The energies of optimized aromatic and aliphatic POC bonds are −2.51 and −2.65 eV, respectively. To explore electrochemical sensing applications, RP nanoparticles are in situ grown on single-walled carbon nanotube (SWCNT). Such a stable RP/SWCNT suspension is applied to fabricate the RP/SWCNT integrated arrays via a template-filtration method. Such an array is efficient for sensitive and selective monitoring of p-phenylenediamine on hair dyes. This study provides insights into surface chemistry of RP, its roles in electrochemical sensing applications, and an approach to produce high-performance RP sensors at large scales.

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High‐Loading, Well‐Dispersed Phosphorus Confined on Nanoporous Carbon Surfaces with Enhanced Catalytic Activity and Cyclic Stability

et al. 2021

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Phosphorus‐doped carbon materials are promising alternatives to noble metal‐based catalysts for the highly selective oxidation of benzyl alcohol to benzaldehyde, but it is challenging to achieve high loadings of high‐activity P dopants in metal‐free catalysts. Here, the preparation of high‐loading and well‐dispersed P atoms confined to the surfaces of cellulose‐derived carbon via a dissolving‐doping strategy is reported. In this method, cellulose is dissolved in phosphoric acid to generate a cellulose‐phosphoric supramolecular collosol, which is then directly carbonized. The as‐prepared carbon possesses a high specific surface area of 1491 cm3 g−1 and a high P content of 8.8 wt%. The P‐doped nanoporous carbon shows a superior catalytic activity and cyclic stability toward benzyl alcohol oxidation, with a high turnover frequency of 3.5 × 10−3 mol g−1 h−1 and a low activation energy of 35.6 kJ mol−1. Experimental results and theoretical calculations demonstrate that the graphitic C3PO species is the leading catalytic active center in this material. This study provides a novel strategy to prepare P dopants in nanoporous carbon materials with excellent catalytic performance.

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Role of surface phosphorus complexes on the oxidation of porous carbons

Cited by 108 publications

References 49 publications

About the Role of Porosity and Surface Chemistry of Phosphorus-Containing Activated Carbons in the Removal of Micropollutants

About the Role of Porosity and Surface Chemistry of Phosphorus-Containing Activated Carbons in the Removal of Micropollutants

Surface Chemistry Determined Electrochemical Sensing Performance of Red Phosphorus and Single Walled Carbon Nanotube Composites

High‐Loading, Well‐Dispersed Phosphorus Confined on Nanoporous Carbon Surfaces with Enhanced Catalytic Activity and Cyclic Stability

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