Nanoporous Carbons with Tuned Porosity

Ania, Conchi O.; Raymundo-Piñero, E.

doi:10.1007/978-981-13-3504-4_5

Cited by 4 publications

(4 citation statements)

References 200 publications

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“…Em termos de ativantes físicos, verifica-se o uso de atmosferas de CO 2 ou vapor superaquecido, preferíveis ao uso de atmosferas de O 2 devido à alta entalpia exotérmica, dificultando o controle da temperatura de reação. Contudo, aqueles requerem a injeção de calor externo, o que permite um controle mais exato das condições experimentais (ANIA; RAYMUNDO-PIÑERO, 2019).…”

Section: Processo De Ativaçãounclassified

Aplicação de biocarvões para remoção de ibuprofeno por adsorção: Tendências na produção, condições operacionais e mecanismos

Porto,

Cuba,

Teran

2023

FAAP

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The presence of drugs in the environment, such as ibuprofen, has raised concern due to their persistence and high-risk potential to local biota and health of exposed population. Thus, removal methods, such as biochars adsorption, gained notoriety for their high efficiencies and reduced production cost. Therefore, the present study developed a systematic literature review regarding the advance of low-cost adsorbents for ibuprofen removal from aqueous media. It was possible to observe certain increase in the production of studies within this subject, with preference of agricultural residues as precursor materials. Pyrolysis temperatures on literature ranged from 200 to 900 °C, depending on the process. Note that two substances (H3PO4 and NaOH) are used with more frequency, for chemical activation and superheated vapors in physical activation processes. Regarding chemical adsorption process, the pH was one of the most relevant factors for adsorption process and, also, most of the authors reported better fit to the pseudo-second order kinetic model; that is, adsorption process generally happening by chemisorption.

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Section: Processo De Ativaçãounclassified

Aplicação de biocarvões para remoção de ibuprofeno por adsorção: Tendências na produção, condições operacionais e mecanismos

Porto,

Cuba,

Teran

2023

FAAP

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“…This might be due to the typically small current densities obtained (as a result of the typically poor conductivity in microporous carbons). However, recent advances in the synthesis of carbon materials have enabled to prepare carbons with high surface areas and controlled micropores [47].…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…Another challenge is to synthesize adequate control materials to isolate the effects of porosity from those of surface chemistry. Very often the synthetic approach followed to obtain carbons with controlled pore architectures and high functionalization (e.g., soft/hard templating, sol-gel methods with adequate choice of precursor, post-synthetic functionalization) [47] cannot be used to prepare un-doped materials with similar porosity, or non-porous doped materials with identical composition. Hence, a complete physicochemical and morphological characterization of the electrocatalysts is compelling to analyze the electrocatalytic activity and discuss it considering the contributions of the different factors (Figure 3).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Nanoporous carbons for the electrochemical reduction of CO2: Challenges to discriminate the roles of nanopore confinement and functionalization

Gomis‐Berenguer

Amaterz

Torres

et al. 2023

Current Opinion in Electrochemistry

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“…For example, the textural properties of the most efficient activated carbons as MAXSORB-III [19] can provide the specific methane storage capacity of over 200 m 3 (NTP)/m 3 at the pressure of 3.4 MPa and 293 K. However, a further increase in the efficiency of carbon adsorbents is limited mainly by the standard methods of their synthesis, including carbonization and activation. It is known that an increase in the activation degree of a carbon material induces an increase both in the volume of micropores and the specific surface area [20]. However, it inevitably leads to the expansion of pores and reduces the packing density [21], which negatively affects its specific total methane capacity.…”

Section: Introductionmentioning

confidence: 99%

ZrBDC-Based Functional Adsorbents for Small-Scale Methane Storage Systems

Соловцова

Меньщиков

Школин

et al. 2022

Adsorption Science & Technology

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Metal-organic frameworks (MOF), potentially porous coordination structures, are envisioned for adsorption-based natural gas (ANG) storage, including mobile applications. The factors affecting the performance of the ANG system with a zirconium-based MOF with benzene dicarboxylic acid as a linker (ZrBDC) as an adsorbent were considered: textural properties of the adsorbent and thermal effect arising upon adsorption. The high-density ZrBDC-based pellets were prepared by mechanical compaction of the as-synthesized MOF powder at different pressures from 30 to 240 MPa at 298 K without a binder and mixed with polymer binders: polyvinyl alcohol (PVA) and carboxyl methylcellulose (CMC). The structural investigations revealed that the compaction of ZrBDC with PVA under 30 MPa was optimal to produce the ZrBDC-PVA adsorbent with more than a twofold increase in the packing density and the lowest degradation of the porous structure. The specific total and deliverable volumetric methane storage capacities of the ZrBDC-based adsorbents were evaluated from the experimental data on methane adsorption measured up to 10 MPa and within a temperature range from 253 to 333 K. It was measured experimentally that at 253 K, an 100 mL adsorption tank loaded with the ZrBDC-PVA pellets exhibited the deliverable methane storage capacity of 172 m3(NTP)/m3 when the pressure dropped from 10 to 0.1 MPa. The methane adsorption data for the ZrBDC powder and ZrBDC-PVA pellets were used to calculate the important thermodynamic characteristic of the ZrBDC/CH4 adsorption system—the differential molar isosteric heat of adsorption, which was used to evaluate the state thermodynamic functions: entropy, enthalpy, and heat capacity. The initial heats of methane adsorption in powdered ZrBDC evaluated from the experimental adsorption isosteres were found to be ~19.3 kJ/mol, and then these values in the ZrBDC/CH4 system decreased at different rates during adsorption. In contrast, the heat of methane adsorption onto the ZrBDC-PVA pellets increased from 19.4 kJ/mol to a maximum with a magnitude, width, and position depended on temperature, and then it fell. The behaviors of the thermodynamic state functions of the ZrBDC/CH4 adsorption system were interpreted as a variation in the state of adsorbed molecules determined by a ratio of CH4-CH4 and CH4-ZrBDC interactions. The heat of adsorption was used to calculate the temperature changes of the ANG systems loaded with ZrBDC powder and ZrBDC pellets during methane adsorption under adiabatic conditions; the maximum integrated heat of adsorption was found at 273 K. The maximum temperature changes of the ANG system with the ZrBDC materials during the adsorption (charging) process did not exceed 14 K that are much lower than those reported for the systems loaded with activated carbons. The results obtained are of direct relevance for designing the adsorption-based methane storage systems for the automotive industry, developing new gas-power robotics systems and uncrewed aerial vehicles.

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Nanoporous Carbons with Tuned Porosity

Cited by 4 publications

References 200 publications

Aplicação de biocarvões para remoção de ibuprofeno por adsorção: Tendências na produção, condições operacionais e mecanismos

Aplicação de biocarvões para remoção de ibuprofeno por adsorção: Tendências na produção, condições operacionais e mecanismos

Nanoporous carbons for the electrochemical reduction of CO2: Challenges to discriminate the roles of nanopore confinement and functionalization

ZrBDC-Based Functional Adsorbents for Small-Scale Methane Storage Systems

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