Aminated N-doped graphene hydrogel for long-term catalytic oxidation in strong acidic environment

Xu, Yongsheng; Li, Xintong; He, Hong; Song, Yuexiao; Xia, Qing; Peng, Wenchao

doi:10.1016/j.jhazmat.2020.123742

Cited by 12 publications

(10 citation statements)

References 40 publications

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“…GO was prepared by the modified Hummer’s method. , The detailed preparation process is described in the Supporting Information. First, 200 mL of GO suspension (1 mg/mL), 2.4 mL of EDA, and 0.6 mL of ammonia solution were mixed in a three-necked flask under vigorous stirring for 0.5 h at room temperature, followed by reflux for 6 h at 95 °C.…”

Section: Methodsmentioning

confidence: 99%

“…Carbon materials have a lower work function (∼5.30 eV) compared with platinum (∼5.65 eV) to be more suitable as supports of Pt. , Graphene, as a unique two-dimensional carbon material, can eliminate internal diffusion and provide a large surface area to disperse active sites. − Meanwhile, benefited by the amine-functionalized support to disperse and anchor Pt nanoparticles, herein, two-dimensional aminated graphene (NH 2 -GR) was prepared with graphene oxide (GO) and ethanediamine (EDA). Then, the hydrophilic groups of amino and residual oxygen-containing functional groups were shielded by hydrophobic trimethoxyoctylsilane to obtain the dual-modified graphene( x -S-NH 2 -GR).…”

Section: Introductionmentioning

confidence: 99%

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Liquid-Phase Catalytic Exchange of Hydrogen Isotopes over Platinum on Dual-Modified Graphene

Feng

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Although liquid-phase catalytic exchange is an environmentally friendly treatment of hydrogen isotopes in recycled water of a nuclear power station, the successive development of hydrophobic catalysts is still needed to meet much higher catalytic exchange efficiency and stability. Herein, a dual-modified graphene with Pt loading was designed by amination and silanization to anchor Pt nanoparticles uniformly, as well as obtain higher hydrophobicity. After coating the reactor walls with poly(dimethylsiloxane), the catalytic exchange efficiency of the dual-modified graphene with lower Pt loadings (Pt/200-S-NH2-GR) improved up to 91% at 80 °C, which was higher than 80% of only animated graphene (Pt/NH2-GR) at the same condition. Furthermore, the Pt/200-S-NH2-GR maintained high stability for at least 10 h in the temperature range of 40–80 °C, while the Pt/NH2-GR decreased 17% of catalytic exchange efficiency at 80 °C within 10 h. Using the dual-modified strategy for graphene support, high efficiency and stability was achieved for heavy water dedeuteration.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid-Phase Catalytic Exchange of Hydrogen Isotopes over Platinum on Dual-Modified Graphene

Feng

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Even though the benefits of AOPs are widely recognized for their ability to mineralize organic pollutants to carbon dioxide (CO 2 ) and water (H 2 O) [30,31], the application of AOPs has significant limitations. Among the main barriers detected, the scarce implementation of these advanced processes at a full scale in comparison to the available research and laboratory-scale tests is highlighted [7].…”

Section: Barriers and Limitations Acribed To Sr-aops Implementationmentioning

confidence: 99%

“…AOPs are considered as promising and environmentally friendly oxidation technologies [30,31] that are based on the generation of powerful radicals, such as hydroxyl radicals (HO•) [26,32] and sulfate radicals (SO 4 • − ). These radicals can oxidize toxic organic components and pathogens contained in WW [5,12,33] that cannot be degraded in conventional WWTPs [6,26].…”

Section: Introductionmentioning

confidence: 99%

Advanced Oxidation Processes Based on Sulfate Radicals for Wastewater Treatment: Research Trends

Urán-Duque

Saldarriaga-Molina

Rubio-Clemente

2021

Water

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In this work, the recent trends in the application of the sulfate radical-based advanced oxidation processes (SR-AOPs) for the treatment of wastewater polluted with emerging contaminants (ECs) and pathogenic load were systematically studied due to the high oxidizing power ascribed to these technologies. Additionally, because of the economic benefits and the synergies presented in terms of efficiency in ECs degradation and pathogen inactivation, the combination of the referred to AOPs and conventional treatments, including biological processes, was covered. Finally, the barriers and limitations related to the implementation of SR-AOPs were described, highlighting the still scarce full-scale implementation and the high operating-costs associated, especially when solar energy cannot be used in the oxidation systems.

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“…Therefore, the PMS anions can adsorb and be activated easily by stretching the peroxy O-O band to produce nonradical reactive oxygen species (ROS) for direct oxidation. However, ROS in nonradical systems normally exhibit a mild oxidation potential (<1.1 V), leading to insufficient mineralization of total organic carbons (TOC). ,− Furthermore, the nonradical oxidation typically occurs on the surface regime of the catalysts, which may cause the oxidation of dopants and carbon frameworks and lead to catalyst deactivation (Table S1).…”

Section: Introductionmentioning

confidence: 99%

Fine-Tuning Radical/Nonradical Pathways on Graphene by Porous Engineering and Doping Strategies

Wang

Duan

et al. 2021

ACS Catal.

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Nitrogen and sulfur co-doped graphene (N,S-G) is activated using ZnCl2, KOH, and CO2 to develop different defects and functionalities. The modified carbo-catalysts are used to activate peroxymonosulfate (PMS) for phenol degradation. Compared with nitrogen-doped graphene (N-G), N,S-G exhibits better catalytic activity, and KOH activation further enhances the oxidation efficiency. Radical quenching experiments, electrochemical characterization, and electron paramagnetic resonance characterization reveal that N-G activates PMS via a nonradical pathway. The involvement of a secondary sulfur dopant will transform the reaction pathway into radical-dominated oxidation (SO4 •–and •OH). KOH activation further promotes the generation of the two radical species and further involves superoxide ion radicals (O2 •–), thus achieving deeper mineralization of the organic pollutants. Different from the nonradical species confined on the catalyst surface, radical oxidation (including the singlet oxygen (1O2) transformed from O2 •–) occurs in bulk solution and protects the carbo-catalyst from corrosion, herein securing better structural integrity and stability of carbo-catalysts. Based on the structure–activity features, we designed a high-performance scalable carbo-catalyst of KOH-activated and N,S-codoped graphene (N,S-G-rGO-KOH) using a facile strategy, which is promising for practical applications.

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Aminated N-doped graphene hydrogel for long-term catalytic oxidation in strong acidic environment

Cited by 12 publications

References 40 publications

Liquid-Phase Catalytic Exchange of Hydrogen Isotopes over Platinum on Dual-Modified Graphene

Liquid-Phase Catalytic Exchange of Hydrogen Isotopes over Platinum on Dual-Modified Graphene

Advanced Oxidation Processes Based on Sulfate Radicals for Wastewater Treatment: Research Trends

Fine-Tuning Radical/Nonradical Pathways on Graphene by Porous Engineering and Doping Strategies

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