CO2 capture on KOH-activated carbons derived from yellow mombin fruit stones

Fiuza-Jr, Raildo Alves; Andrade, Robson Carlos de; Andrade, Heloysa Martins Carvalho

doi:10.1016/j.jece.2016.09.025

Cited by 49 publications

(18 citation statements)

References 32 publications

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“…Several activation temperatures were compared in his work, and the optimal activation temperature was 800°C. Fiuza-Jr et al 20 investigated the capacity of CO 2 capture of activated carbons with KOH as activator from yellow mombin fruit stones. Moreover, micropores were considered as the key factor for CO 2 capture.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

2019

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Activated carbon is a promising material that has a broad application prospect.In this work, biomass (tea seed shell) was used to prepare activated carbon with KOH activation (referred to as AC), and nitrogen was doped in activated carbon using melamine as the nitrogen source (referred to as NAC-x, where x is the mass ratio of melamine and activated carbon). The obtained activated biomass carbon (activated bio-carbon) samples were characterized by Brunauer-Emmett-Teller (BET)-specific surface area analysis, ultimate analysis, X-ray photoelectron spectroscopy (XPS) analysis, Raman spectrum analysis, and X-ray diffraction (XRD) patterns. The specific surface areas of activated bio-carbons were 1503.20 m 2 /g (AC), 1064.54 m 2 /g (NAC-1), 1187.93 m 2 /g (NAC-2), 1055.32 m 2 /g (NAC-3), and 706.22 m 2 /g (NAC-4), revealing that nitrogen-doping process leads to decrease in specific surface area. XPS analysis revealed that the main nitrogen-containing functional groups were pyrrolic-N and pyridinic-N. The capacity of CO 2 capture and electrochemical performance of activated bio-carbon samples were investigated. The CO 2 capturing capacity followed this order: AC (3.15 mmol/g) > NAC-2 (2.75 mmol/g) > NAC-1 (2.69 mmol/g) > NAC-3 (2.44 mmol/g) > NAC-4 (1.95 mmol/g) at 298 K at 1 bar, which is consistent with the order of specific surface area. The specific surface area played a dominant role in CO 2 capturing capacity. As for supercapacitor, AC-4 showed the highest specific capacitance (168 F/g) at the current density of 0.5 A/g, but NAC-2 showed the best electrochemical performance (89 F/g) at 2 A/g. Nitrogen-containing functional groups and specific surface area both had an important impact on electrochemical performance. In general, NAC-3 and NAC-2 produced excellent electrochemical performance. Compared with NAC-3, less melamine was used to prepare NAC-2; therefore, NAC-2 was considered as the best activated bio-carbon for supercapacitor for 141 F/g (at 0.5 A/g), 108 F/g (at 1 A/g), and 89 F/g (at 2 A/g) in this work.

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Section: Introductionmentioning

confidence: 99%

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

2019

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“…This effect of temperature on CC was marginal at low loading. Fiuza-Jr et al [26] also reported similar trend in their KOH modified AC derived from yellow mombins, in which the CO2 capture was carried out at temperature from 0 to 75 °C (3.2 mmol/g, 1.6 mmol/g and 0.8 mmol/g over temperature ranges (0-25), and (50-75) °C respectively). As mentioned before, 20 wt% and 30 wt% MEA loaded Starbons ® demonstrated relatively higher values of CC viz., 2.274 mmol/g and 2.54 mmol/g at 50 °C which clearly showed the positive effect of amine loading on capture capacity.…”

Section: Effect Of Temperaturementioning

confidence: 57%

Carbon capture using amine modified porous carbons derived from starch (Starbons®)

2019

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Adsorption based carbon capture to address the serious concern of global warming has been gaining worldwide attention of researchers due to its inherent advantages vis a vis other technical options like absorption, membrane and cryogenic separations, chemical looping combustion etc. Porous carbons from biomass wastes are under focus currently owing to its abundance, simple synthesis and regeneration and flexibility to achieve the desired pore structure and chemical modification. Carbon capture studies using porous carbons from starch have received little attention when compared to other biomass precursors. Hence in this work, facile synthesis of porous carbons from corn and potato starch has been employed. These were then screened w.r.t physico-chemical properties using different analytical tools like XRD, FTIR and BET surface area. Amine loading was done by wet impregnation method at different levels from 10 to 30% by wt to enhance their CC performance. Process standardization was done to maximize the CC capacity w.r.t critical process parameters like carbonation time, temperature, loading level, biomass precursor etc. A reasonably good CC of 3.4 mmol/g has been achieved at the optimal conditions. Cyclic stability and regenerability studies were also conducted to assess their stability and long term deployment potential. Amine loading was found to have a positive influence in achieving higher CC but at the cost of cyclic stability. From our studies, we could state that Starbons ® have a great potential to act as green sorbent in CC and the technology is in nascent stage, there is a huge window for innovation in synthesis, structure and chemical modification.

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“…The activated carbons were characterized as reported in previous papers [7,29] and the procedures are briefly described here.…”

Section: Characterizationmentioning

confidence: 99%

“…The Dubinin-Astakhov exponent (n) indicates the heterogeneity degree of a micropore system [39], so that the narrower the micropore size range, more homogeneous the distribution and, for carbonaceous adsorbents, n < 2 is assigned to heterogeneous micropore distributions [29,40]. The value of the DA exponent was lower for the activated carbons derived from HT250, namely, n ~ 1, therefore indicating that these samples present a heterogeneous micropore network.…”

Section: Characterization Of the Activated Carbonsmentioning

confidence: 99%

Activated carbon microspheres derived from hydrothermally treated mango seed shells for acetone vapor removal

et al. 2020

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Mango fruit seed shells were used as starting materials to produce activated carbons for the capture of acetone, a typical volatile organic compound (VOC), from gaseous streams. This fruit waste presents high volatiles and low ashes contents, as expected for the lignocelulosic materials commonly used for the preparation of activated carbons. The starting material was hydrothermally treated at 180 or 250 °C for 5 h and the obtained hydrochars were activated with KOH solutions. The carbon samples were characterized by SEM, EDX, TG/DTA, Raman spectroscopy and textural analysis by physisorption. The adsorption capacity and adsorption cycles were investigated by TG. The hydrochars presented spherical morphology and the activated carbons derived from them presented heterogeneous micropore structures allowing to high capacity of acetone vapor removal, namely 472 mg/g, at 30 °C and 363 mg/g, at 50 °C. The results indicate that the adsorption capacity of the activated carbons is directly related to their Dubinin-Astakhov micropore surface areas and microporous volumes determined by NLDFT. The adsorption of acetone vapor showed a pseudo-first order kinetics and both external and intraparticle transport contributed for the overall process. Highly efficient and stable acetone vapor removal was observed over the activated carbons after five cycles.

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CO2 capture on KOH-activated carbons derived from yellow mombin fruit stones

Cited by 49 publications

References 32 publications

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Carbon capture using amine modified porous carbons derived from starch (Starbons®)

Activated carbon microspheres derived from hydrothermally treated mango seed shells for acetone vapor removal

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CO2 capture on KOH-activated carbons derived from yellow mombin fruit stones

Cited by 49 publications

References 32 publications

Nitrogen‐doping activated biomass carbon from tea seed shell for CO 2 capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO 2 capture and supercapacitor

Carbon capture using amine modified porous carbons derived from starch (Starbons®)

Activated carbon microspheres derived from hydrothermally treated mango seed shells for acetone vapor removal

Contact Info

Product

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Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor