Role of chemical activation in the development of carbon porosity

Molina‐Sabio, M.; Rodríguez‐Reinoso, F.

doi:10.1016/j.colsurfa.2004.04.007

Cited by 559 publications

(261 citation statements)

References 37 publications

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“…The activation using KOH (sample OG8-KO-P) resulted in a high development of the microporosity-mainly narrow micropores of small sizes (Fig. 2), in agreement with the numerous works in the literature reporting the chemical activation of various precursors (Lillo-Ródenas et al 2004;Lozano-Castelló et al 2001;Molina-Sabio et al 2004;Marsh and Rodriguez-Reinoso 2006 and references therein). In contrast, the mesoporosity of the organic resin disappeared, as inferred from the almost negligible hysteresis loop in the desorption branch of the N 2 adsorption isotherm.…”

Section: Physical Vs Chemical Activationsupporting

confidence: 73%

Designing micro- and mesoporous carbon networks by chemical activation of organic resins

et al. 2016

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Section: Physical Vs Chemical Activationsupporting

confidence: 73%

Designing micro- and mesoporous carbon networks by chemical activation of organic resins

et al. 2016

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“…It displays the similar results and also shows the collapsed morphology structure [18,26]. With excessive impregnation with H 3 PO 4 , it might form an insulating layer which inhibits the activation process [27]. Besides, it was found that washing process played a crucial role for the development of pore in activated carbon.…”

Section: Moisture Contentsupporting

confidence: 62%

Preparation and characterization of activated carbon from Typha orientalis leaves

et al. 2014

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Background In this study, activated carbon (AC) was prepared from Typha orientalis or commonly known as cattail leaves using physical and chemical activation phosphoric acid (H 3 PO 4 ), as dehydrating agent. A twostage process was used, i.e., semi-carbonization stage at 200°C for 15 min as first stage followed by second stage activation, at 500°C for 45 min. The precursor material with the impregnated agent was exposed straight away to semi-carbonization and activation temperature using a laboratory scale muffle furnace (Carbolite RHF 1500, England) under static condition in a self-generated atmosphere.Results The best condition in AC production was based on chemical activation which is AC2 with 2 M of H 3 PO 4 . AC2 has the highest removal efficiency, 97.4 % in 4 ppm concentration of Pb(II) and percentage yield of 62.73 % could be reached. The pH of the AC was controlled in the range 5-6. From Fourier transform infrared spectroscopy, functional groups such as hydroxyl group, lactone group, and carboxyl group were obtained. These were clearly illustrated by scanning electron microscopy micrographs that porous structure was progressively developed with sponge-like structure. Conclusions The Pb(II) adsorption results were best fitted in the Langmuir isotherm for equilibrium data while the adsorption kinetic fitted to the pseudo-second order model. The maximum Brunauer, Emmett and Teller surface area of the best produced AC was found to be around 1,238 m 2 / g. The maximum adsorption capacity was found to be 7.95 mg/g.

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“…It also inhibit the formation of tar and other liquid that might fill the pores during activation process. The use of phosporic acid as an activating agent promotes depolymerization, dehydartion and redistribution of contituent biopolymer thus increases the yield of activated carbon [17,18,19]. The increase of carbon yield is related to the microporosity development.…”

Section: Resultsmentioning

confidence: 99%