Comparison of by-product gas composition by activations of activated carbon

Lee, Gi Bbum; Park, Jung Eun; Hwang, Sohyun; Kim, Ji Hyun; Kim, Seokhwi; Kim, Ho; Hong, Bum Ui

doi:10.1007/s42823-019-00030-2

Cited by 13 publications

(18 citation statements)

References 28 publications

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“…• C overnight prior to use. First, the dried S-AC were thermally regenerated at 850 • C for 3 h [19,20].…”

Section: Preparation Of Regenerated Acsmentioning

confidence: 99%

Regeneration of Activated Carbons Spent by Waste Water Treatment Using KOH Chemical Activation

Park¹,

Lee²,

Hong³

et al. 2019

Applied Sciences

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In this study, spent activated carbons (ACs) were collected from a waste water treatment plant (WWTP) in Incheon, South Korea, and regenerated by heat treatment and KOH chemical activation. The specific surface area of spent AC was 680 m2/g, and increased up to 710 m2/g through heat treatment. When the spent AC was activated by the chemical agent potassium hydroxide (KOH), the surface area increased to 1380 m2/g. The chemically activated ACs were also washed with acetic acid (CH3COOH) to compare the effect of ash removal during KOH activation. The low temperature N2 adsorption was utilized to measure the specific surface areas and pore size distributions of regenerated ACs by heat treatment and chemical activation. The functional groups and adsorbed materials on ACs were also analyzed by X-ray photoelectron spectroscopy and X-ray fluorescence. The generated ash was confirmed by proximate analysis and elementary analysis. The regenerated ACs were tested for toluene adsorption, and their capacities were compared with commercial ACs. The toluene adsorption capacity of regenerated ACs was higher than commercial ACs. Therefore, it is a research to create high value-added products using the waste.

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“…• C overnight prior to use. First, the dried S-AC were thermally regenerated at 850 • C for 3 h [19,20].…”

Section: Preparation Of Regenerated Acsmentioning

confidence: 99%

Regeneration of Activated Carbons Spent by Waste Water Treatment Using KOH Chemical Activation

Park¹,

Lee²,

Hong³

et al. 2019

Applied Sciences

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“…For Case 1, the treatment method was a one-step chemical activation. The solid phase of the SAC was mixed with a solid phase of potassium hydroxide (KOH, Samchun Chemical, Seoul, South Korea), at a SAC/KOH weight ratio of 0.5 [ 19 , 20 , 21 ]. The samples were gradually heated at 5 °C/min until 750 °C, at which the temperature was maintained for 1 h. Subsequently, the samples were heated to 850 °C at a rate of 5 °C/min, and then held for 3 h. After chemical activation, the samples were washed with water three times and then neutralized.…”

Section: Methodsmentioning

confidence: 99%

“…An elemental analysis (EA) was conducted by following procedures described elsewhere using an elemental analyzer (Flash EA 1112, Thermo Scientific, Milan, Italy). The elemental contents of C, H, O, N, and S were determined [ 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

Pre-Treatment Methods for Regeneration of Spent Activated Carbon

et al. 2020

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Spent activated carbon (SAC) usually exhibits a low specific surface area due to its high ash contents. In this study, pre-treatments, such as heat and acid treatments, were optimized to improve this feature. The heat pre-treatment did not reduce the ash content, nor did it increase the surface area. Because metallic ions adsorbed in SACs turn into ash upon the heat treatment. In the acid pre-treatment, the volatiles and fixed carbon were increased with decreasing ash contents. In this study, it was found that the surface area increase was correlated with the ratio between fixed carbon and ash. Among the pre-treatment methods, the combined heat and acid pre-treatment method highly increased the ratio, and therefore led to the surface area increase. Additionally, the acid pre-treatment was carried out using different types of acid (organic and inorganic acids) solutions to further improve the surface areas. The organic acid treatment caused a significant structural collapse compared to the inorganic acid treatment, decreasing the surface area. In particular, H3PO4 effectively removed ashes adsorbed on the activated carbon surface and regenerated the exhausted activated carbon. Both the heat and acid pre-treatments before chemical activation resulted in the positive effects such as strong desorption of pollutants and ashes within the internal structure of the activated carbon. Therefore, the regeneration introduced in this study is methodically the best method to regenerate SAC and maintain a stable structure.

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“…In the chemical activation method, 1.0 g of the commercial ACs and 2.0 g of KOH were mixed together, and the mixture was placed into a furnace as shown in Figure S1b. The sample was heated to 850°C and maintained at this temperature for 4 hours 16 . After the activation process, the sample was cooled to room temperature and washed and neutralized using water and sulfuric acid, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The sample was heated to 850 C and maintained at this temperature for 4 hours. 16 After the activation process, the sample was cooled to room temperature and washed and neutralized using water and sulfuric acid, respectively. The sample was then dried in an oven prior to use.…”

Section: Preparation Of Active Materialsmentioning

confidence: 99%

Stable fast‐charging electrodes derived from hierarchical porous carbon for lithium‐ion batteries

Hwang

Lee

et al. 2020

Int J Energy Res

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Summary Lithium‐ion batteries (LIBs) have been widely used for powering electric vehicles (EVs), however, the charging time of LIBs is considerably higher than the refueling time of petrol‐fueled vehicles, which limits the applications of LIBs. Materials that can overcome this limitation should be developed, and these materials should be inexpensive to commercialize. In this study, activated carbon (AC) was used as an anode material in LIB to satisfy both the requirements. The surface and pore structure of commercial AC was suitably modified for fast charging using physical and chemical activation methods, that is, P‐AC and C‐AC, respectively. We focused on the stability of various kinds of electrode materials, such as AC, C‐AC, P‐AC, commercial graphite, and graphene, under fast‐charging conditions. Among these methods, P‐AC exhibited the most stable and highest capacity during 500 cycles at the 5C rate, although the initial capacity (<50 cycles) of P‐AC was given the second priority. We believe that the suitable mixture of meso‐ and micropores in P‐ACs increases the diffusivity and insertion rate of the Li‐ion (solvation) at fast‐charging condition, thereby leading to higher long‐term stability.

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Comparison of by-product gas composition by activations of activated carbon

Cited by 13 publications

References 28 publications

Regeneration of Activated Carbons Spent by Waste Water Treatment Using KOH Chemical Activation

Regeneration of Activated Carbons Spent by Waste Water Treatment Using KOH Chemical Activation

Pre-Treatment Methods for Regeneration of Spent Activated Carbon

Stable fast‐charging electrodes derived from hierarchical porous carbon for lithium‐ion batteries

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