Enhancements of surface functional groups and degree of graphitization in gamma irradiated activated carbon as an electrode material

Kwamman, Tanagorn; Anantachisilp, Suranan; Limmeechokchai, Passavorn; Kanjana, Kotchaphan

doi:10.1016/j.radphyschem.2022.110062

Cited by 16 publications

(7 citation statements)

References 44 publications

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“…With further observation of the Raman spectra (800–2000 cm –1 ) in Figure S12, the peaks at 1342 and 1600 cm –1 were attributed to the D-band (A 1g mode) and G-band (E 2g mode) of AC, respectively. , The ratio of the D-band to the G-band (I D /I G ) peak area intensity was generally used to represent the degree of graphitization of carbon materials. A lower I D /I G ratio means a higher graphitization degree and better electrical conductivity . Among all the samples, 5Mn/AC-A possessed the smallest I D /I G value and lowest impedance (Figure S13).…”

Section: Resultsmentioning

confidence: 99%

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Exceptional Ozone Decomposition over δ-MnO₂/AC under an Entire Humidity Environment

Dai

Zhang

et al. 2023

Environ. Sci. Technol.

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Ozone (O3) pollution is highly detrimental to human health and the ecosystem due to it being ubiquitous in ambient air and industrial processes. Catalytic decomposition is the most efficient technology for O3 elimination, while the moisture-induced low stability represents the major challenge for its practical applications. Here, activated carbon (AC) supported δ-MnO2 (Mn/AC-A) was facilely synthesized via mild redox in an oxidizing atmosphere to obtain exceptional O3 decomposition capacity. The optimal 5Mn/AC-A achieved nearly 100% of O3 decomposition at a high space velocity (1200 L g–1 h–1) and remained extremely stable under entire humidity conditions. The functionalized AC provided well-designed protection sites to inhibit the accumulation of water on δ-MnO2. Density functional theory (DFT) calculations confirmed that the abundant oxygen vacancies and a low desorption energy of intermediate peroxide (O2 2–) can significantly boost O3 decomposition activity. Moreover, a kilo-scale 5Mn/AC-A with low cost (∼1.5 $/kg) was used for the O3 decomposition in practical applications, which could quickly decompose O3 pollution to a safety level below 100 μg m–3. This work offers a simple strategy for the development of moisture-resistant and inexpensive catalysts and greatly promotes the practical application of ambient O3 elimination.

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Section: Resultsmentioning

confidence: 99%

“…A lower I D /I G ratio means a higher graphitization degree and better electrical conductivity. 32 Among all the samples, 5Mn/AC-A possessed the smallest I D /I G value and lowest impedance (Figure S13).…”

Section: O 3 Decomposition Activitymentioning

confidence: 99%

Exceptional Ozone Decomposition over δ-MnO₂/AC under an Entire Humidity Environment

Dai

Zhang

et al. 2023

Environ. Sci. Technol.

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“…In the composite CNFs after pickling, the characteristic peaks of Co are significantly weakened, and the characteristic peaks of C are relatively stronger (Figure f). A high-angle shift of the C peak can be observed with increasing initial oxygen concentrations, which may be related to the reinforced degree of graphitization of materials by oxygen activation . The characteristic peak of the Co(111) crystal plane in the composite CNFs still exists, which may be due to the fact that partial Co particles covered by graphitic carbon cannot be removed by pickling .…”

Section: Resultsmentioning

confidence: 99%

Pd-Decorated Hierarchically Porous Carbon Nanofibers for Enhanced Selective Hydrogenation of Phenol

Mao

Zhu

et al. 2022

Ind. Eng. Chem. Res.

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Aiming at the design and preparation of highefficiency catalysts for the selective hydrogenation of phenol, the hierarchically porous Pd@CNF catalysts were fabricated by oxygen-activating ZIF-67/PAN composite nanofibers with O 2 as the oxidant during high-temperature pyrolysis, followed by acid etching and Pd loading. Appropriate initial oxygen concentration and Co 2+ molar concentration are conducive to the fabrication of hierarchically porous carbon nanofibers (CNFs) with a high mesopore and macropore ratio, increased ether-type oxygen content, and good one-dimensional (1D) morphology, which enhance the dispersion and anchoring of Pd, increase the strength of basic sites and H 2 adsorption, and improve the mass transfer and dispersibility in cyclohexane.

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“…In addition to its immediate antimicrobial effects, gamma irradiation facilitates structural changes, leading to enhanced absorption efficiency [22]. Furthermore, gamma irradiation is used to modify the physiochemical and electrical properties of activated carbon, and these properties are dependent on the irradiation conditions [23].…”

Section: Introductionmentioning

confidence: 99%

Irradiated animal bedding material derived from cattail leaves and rice straw with orthophosphoric acid activation for amplified ammonia absorption

Sawangsin,

Boonsakdee,

Yoshimoto

et al. 2023

J. Phys.: Conf. Ser.

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This scientific study investigates the suitability of cattail leaves and rice straw as biomass materials for animal bedding. Cattail, an invasive plant species known for its ability to thrive in nutrient-rich environments, offers high cellulose content for absorption. In combination with rice straw, which is readily available and cost-effective, the aim is to achieve optimal carbon-to-nitrogen ratios that suppress the growth of microorganisms. To resist bacterial growth, the mixed cattail leaves and rice straw samples undergo treatment with orthophosphoric acid at concentration of 25%, 30%, and 35% v/v, followed by gamma irradiation at 25 kGy. A comprehensive evaluation of the materials, focusing on surface morphology, water absorption, ammonia absorption, and bacterial resistance was conducted. SEM images provide evidence of dramatic surface restructuring. Samples treated with 30% v/v orthophosphoric acid exhibit enhanced water absorption capacities, and can absorb water equivalent to 2.2 times their own weight. Also, samples containing a 1:1 ratio of cattail leaves and rice straw demonstrate superior ammonia absorptions as evidenced by gas chromatography (GC) measurements compared to other samples. After sample irradiation, less bacterial growth was observed by optical density measurements. These findings support the potential utilization of a 1:1 ratio of cattail leaves and rice straw, treated with orthophosphoric acid of 30% v/v and irradiated with gamma radiation, as an effective animal bedding material. This combination offers advantages in terms of waste absorption and microbial control, making it a promising option for use in animal husbandry and laboratory settings.

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Enhancements of surface functional groups and degree of graphitization in gamma irradiated activated carbon as an electrode material

Cited by 16 publications

References 44 publications

Exceptional Ozone Decomposition over δ-MnO₂/AC under an Entire Humidity Environment

Exceptional Ozone Decomposition over δ-MnO₂/AC under an Entire Humidity Environment

Pd-Decorated Hierarchically Porous Carbon Nanofibers for Enhanced Selective Hydrogenation of Phenol

Irradiated animal bedding material derived from cattail leaves and rice straw with orthophosphoric acid activation for amplified ammonia absorption

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Enhancements of surface functional groups and degree of graphitization in gamma irradiated activated carbon as an electrode material

Cited by 16 publications

References 44 publications

Exceptional Ozone Decomposition over δ-MnO2/AC under an Entire Humidity Environment

Exceptional Ozone Decomposition over δ-MnO2/AC under an Entire Humidity Environment

Pd-Decorated Hierarchically Porous Carbon Nanofibers for Enhanced Selective Hydrogenation of Phenol

Irradiated animal bedding material derived from cattail leaves and rice straw with orthophosphoric acid activation for amplified ammonia absorption

Contact Info

Product

Resources

About

Exceptional Ozone Decomposition over δ-MnO₂/AC under an Entire Humidity Environment

Exceptional Ozone Decomposition over δ-MnO₂/AC under an Entire Humidity Environment