Mercury vapor adsorption and sustainable recovery using novel electrothermal swing system with gold-electrodeposited activated carbon fiber cloth

Liao, Hua-Yung; Pan, Shu-Yuan; You, Shu-Wen; Hou, Chia‐Hung; Wang, Can; Deng, Jiguang; Hsi, Hsing‐Cheng

doi:10.1016/j.jhazmat.2020.124586

Cited by 12 publications

(3 citation statements)

References 33 publications

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“…These experimental results indicate that the carbon content decreased, while the oxygen content increased with an increase in desorption temperature. The decrease in carbon content is mainly due to hotspot formation caused by uneven electrothermal heating [28][29][30], which causes the materials instantaneously heat up in limited regions, causing the vaporization of hydrocarbon species. For MEK-KBAC, however, the increase in oxygen content after electrothermal regeneration may also be attributed to the reaction of MEK with the carbon surface of KBAC.…”

Section: Chemical and Physical Properties Of Virgin And Electrotherma...mentioning

confidence: 99%

“…Our earlier works [23,24] have shown that microwave regeneration is effective and feasible in regenerating BAC samples within a short period. Additionally, an electrothermal swing system (ETS) has also been shown to successfully overcome the abovementioned defects of conventional hot steam regeneration [25][26][27][28][29][30][31]; the ETS has been applied for continuous adsorption and desorption of gaseous pollutants such as CO 2 , VOCs, and even elemental mercury.…”

Section: Introductionmentioning

confidence: 99%

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Regeneration of beaded activated carbon saturated with volatile organic compounds by a novel electrothermal swing adsorption system

You

Wang

et al. 2022

Sustain Environ Res

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A commercially available beaded activated carbon (KBAC) was selected for combination with a novel electrothermal swing system in examining the Joule heating effects on the physical and chemical properties of activated carbon and its adsorption regenerability at various regeneration temperatures (120, 140, and 160 °C) after saturation by toluene (TOL) and methylethylketone (MEK). The specific surface area (1278 m2 g− 1) and micropore volume (0.48 cm3 g− 1) for KBAC after one adsorption/desorption cycle were slightly reduced, while KBAC micropore surface area (1158 m2 g− 1) and micropore volume decreased significantly after six adsorption/desorption cycles. It can be inferred that the pores of KBAC, especially micropores, are blocked by heel buildup caused mainly by formation of cracked TOL and MEK coke generated by cyclic Joule heating. The desorption efficiencies of TOL-KBAC and MEK-KBAC (KBAC saturated with TOL and MEK, respectively) evaluated per the gravimetric method ranged from 55 to 80 and 85–90%, respectively, and both showed great correlation between regeneration temperature and desorption efficiency. Notably, the desorption efficiencies calculated from the integral method based on breakthrough curves were 8 and 16% lower than those directly obtained by the gravitational method for TOL-KBAC and MEK-KBAC, respectively. The larger difference in desorption efficiency evaluated by the two methods for MEK-KBAC is likely caused by the decomposition of MEK into CO or CO2, which was less prominent in TOL-KBAC. In the cyclic adsorption/desorption tests, the adsorption capacities of both TOL-KBAC and MEK-KBAC decreased after the 6-cycle electrothermal swing regeneration, such that TOL-KBAC adsorption capacity significantly reduced to around 50%, while that of MEK-KBAC retained around 70% of their respective original adsorption capacities. As aforementioned, heel buildup blocks the pores and leads to decreasing adsorption, especially for TOL.

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Section: Chemical and Physical Properties Of Virgin And Electrotherma...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regeneration of beaded activated carbon saturated with volatile organic compounds by a novel electrothermal swing adsorption system

You

Wang

et al. 2022

Sustain Environ Res

Self Cite

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“…We demonstrate that compared to the traditional Dorris–Gray or Schultz method, this is a relatively simple and yet accurate method to determine surface energy profiles of highly porous carbonaceous materials. To demonstrate our approach, we have selected ACFs as exemplars since they are widely used in the fields involving rapid adsorption and low-pressure loss, including air purification, water treatment, and biomedical or electrochemical applications [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. For instance, ACFs have been utilized as adsorbents for volatile organic compounds (VOCs) due to their extended surface area, fast adsorption–desorption rate, and high hydrophobic or non-polar adsorption capacity [ 18 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Determination of Hydrophobic Dispersive Surface Free Energy of Activated Carbon Fibers Measured by Inverse Gas Chromatographic Technique

et al. 2023

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Activated carbon fibers (ACFs) as one of the most important porous carbon materials are widely used in many applications that involve rapid adsorption and low-pressure loss, including air purification, water treatment, and electrochemical applications. For designing such fibers for the adsorption bed in gas and aqueous phases, in-depth comprehension of the surface components is crucial. However, achieving reliable values remains a major challenge due to the high adsorption affinity of ACFs. To overcome this problem, we propose a novel approach to determine London dispersive components (γSL) of the surface free energy of ACFs by inverse gas chromatography (IGC) technique at an infinite dilution. Our data reveal the γSL values at 298 K for bare carbon fibers (CFs) and the ACFs to be 97 and 260–285 mJ·m−2, respectively, which lie in the regime of secondary bonding of physical adsorption. Our analysis indicates that these are impacted by micropores and defects on the carbon surfaces. Comparing the γSL obtained by the traditional Gray’s method, our method is concluded as the most accurate and reliable value for the hydrophobic dispersive surface component of porous carbonaceous materials. As such, it could serve as a valuable tool in designing interface engineering in adsorption-related applications.

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Experimental evaluation of a hybrid solar dryer with flexible open sorption thermal energy storage unit on demand for burdock root drying

Zhu

et al. 2023

Environ Sci Pollut Res

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Mercury vapor adsorption and sustainable recovery using novel electrothermal swing system with gold-electrodeposited activated carbon fiber cloth

Cited by 12 publications

References 33 publications

Regeneration of beaded activated carbon saturated with volatile organic compounds by a novel electrothermal swing adsorption system

Regeneration of beaded activated carbon saturated with volatile organic compounds by a novel electrothermal swing adsorption system

Determination of Hydrophobic Dispersive Surface Free Energy of Activated Carbon Fibers Measured by Inverse Gas Chromatographic Technique

Experimental evaluation of a hybrid solar dryer with flexible open sorption thermal energy storage unit on demand for burdock root drying

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