Dynamic adsorption behavior of benzene, toluene, and xylene VOCs in single- and multi-component systems by activated carbon derived from defatted black cumin (Nigella sativa L.) biowaste

Batur, Ebru; Kutluay, Sinan

doi:10.1016/j.jece.2022.107565

Cited by 48 publications

(9 citation statements)

References 68 publications

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“…This indicated that sample CC‐3‐700 had a higher adsorption selectivity for toluene over benzene, so that benzene was susceptible to adsorption interference by toluene. Under the same conditions, sample CC‐3‐700 adsorption capacity for benzene was significantly lower than that for toluene, indicating the selective affinity of CC‐3‐700 for toluene over benzene, which agrees with the reports in the literature 45‐47 . This result is probably attributable to the different physical parameters of these two molecules, including their dipole moments (toluene 1.23, benzene 0), molecular weights (toluene 92, benzene 78), boiling points (toluene > benzene), adsorption binding energies (toluene > benzene) and relative partial pressures (toluene 5.4 × 10 −3 , benzene 1.6 × 10 −3 ).…”

Section: Resultssupporting

confidence: 90%

Synthesis of corncob biochar with high surface area by KOH activation for VOC adsorption: effect of KOH addition method

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND: Carbon materials have been regarded as valuable adsorbents for removal of volatile organic compounds (VOCs) owing to their high specific surface area and abundant pore structure. However, the complexity and high cost of the process used to treat the feedstock to produce commercial activated carbon has limited its application. In this reported study, a series of biochar materials was prepared using the KOH modification method employing corn cob as the raw material. The effects of different potassium hydroxide dosages, various activation temperatures and the activator addition method on the structure, physicochemical properties and VOC adsorption performance of the resulting biochars and their structure-activity relationship were systematically studied.RESULTS: Adsorption performance tests and a series of characterization results showed that the CC-3-700 (corn cob/KOH = 1:3, T = 700 °C, two-step dry mixing pyrolysis method) sample had highest toluene dynamic adsorption capacity (up to 573.5 mg g −1 ) compared to the other prepared samples. This result was attributed to the maximum specific surface area (2349 m 2 g −1 ) and pore volume (1.22 cm 3 g −1 ) of this sample. Moreover, the result suggested that the high specific surface area, abundant pore structure and highly disordered non-graphitizable carbon in sample CC-3-700 were the major reasons for its excellent adsorption performance. The results of a multi-component adsorption performance test showed that corn cob biochar had a strong adsorption capacity for toluene when simultaneously exposed to benzene and toluene. CONCLUSION:The results of this study revealed that the corn cob biochar prepared using a two-step roasting method offers good potential prospects for application in the field of VOC pollution control.

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Section: Resultssupporting

confidence: 90%

Synthesis of corncob biochar with high surface area by KOH activation for VOC adsorption: effect of KOH addition method

et al. 2023

J of Chemical Tech & Biotech

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“…The peak at 3440 cm –1 was ascribed to the −OH stretching vibration, while the peaks at 2930 and 2855 cm –1 were attributed to the antisymmetric and symmetric stretching vibrations of C–H . The peaks at 1628, 1210, and 650 cm –1 were regarded as the stretching vibration of CO, , the stretching vibration band of C–O–C, and the vibration of aromatic C–H, respectively. , When CSs were assembled inside HCS, oxygen-containing functional groups in CS were introduced into HCS, and the intensities of CO and C–O–C peaks in C 0.1 @HCS were obviously promoted.…”

Section: Resultsmentioning

confidence: 99%

“…37 The peaks at 1628, 1210, and 650 cm −1 were regarded as the stretching vibration of C�O, 5,38 the stretching vibration band of C−O−C, and the vibration of aromatic C−H, respectively. 39,40 When CSs were assembled inside HCS, oxygen-containing functional groups in CS were introduced into HCS, and the intensities of C�O and C−O− C peaks in C 0.1 @HCS were obviously promoted.…”

Section: Morphology and Structure Characterizationmentioning

confidence: 99%

New Porous Carbon Material Derived from Carbon Microspheres Assembled in Hollow Carbon Spheres and Its Application to Toluene Adsorption

Qin

Asamoah

et al. 2023

Langmuir

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In this paper, a new porous carbon material adsorbent was prepared using carbon microspheres assembled in hollow carbon spheres (HCS) with a hydrothermal method. Transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy were used to characterize the adsorbents. It was found that the diameter of carbon microspheres derived from 0.1 mol/L glucose was about 130 nm, which could be inserted inside HCS (pore size was 370−450 nm). The increase in glucose concentration would promote the diameter of carbon microspheres (CSs), and coarse CSs could not be loaded in the mesopores or macropores of HCS. Thus, the C 0.1 @HCS adsorbent had the highest Brunauer−Emmett−Teller surface area (1945 m 2 /g) and total pore volume (1.627 cm 3 /g). At the same time, C 0.1 @HCS posed a suitable ratio of micropores and mesopores, which could provide adsorption sites and volatile organic compound diffusion channels. Moreover, oxygen-containing functional groups −OH and C�O in CSs were also introduced into HCS, and the adsorption capacity and regenerability performance of the adsorbents were improved. The dynamic adsorption capacity of C 0.1 @HCS for toluene reached 813 mg/g, and the Bangham model was more suitable for describing the toluene adsorption process. The adsorption capacity was stably kept above 770 mg/g after eight adsorption−desorption cycles.

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“…In Batur's study, activated carbon was produced from defatted black cumin biowaste with ZnCl2 activation through the response surface methodology. When the VOCs inlet concentration was 20 mg•L -1 , the adsorption capacity of activated carbon with the specific surface area of 1213 m 2 •g -1 for benzene, toluene, and xylene was 495 mg•g -1 , 580 mg•g -1 , and 674 mg•g -1 , respectively (Batur and Kutluay 2022). Li et al prepared straw-based activated carbon with a toluene adsorption capacity of 322 mg•g -1 and an ethyl acetate adsorption capacity of 240 mg•g -1 by optimizing the process (Li et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Preparation of high-performance activated carbons from hemicellulose pre-extracted residues of poplar and their application in VOCs removal

Zhao²,

Zhou³

et al. 2023

BioRes

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Hemicellulose was pre-extracted from poplar by the KOH extraction method. A series of activated carbons with high VOCs adsorption capacity were prepared using hemicellulose pre-extraction residue (HPR) as carbon precursor and KOH as the activator. The results showed that the pre-extraction using organic solvent (benzene-ethanol mixture) had no significant effect on the hemicellulose removal efficiency and the microporous structure of activated carbons. After the selective pre-extraction of 38.2 to 65.7 wt% hemicellulose from poplar, the final yield of activated carbons only decreased by 1.1 to 2.0%, but the pore structure of activated carbons was greatly improved. A total of 40.7 wt% hemicellulose in poplar was removed under 4 wt% alkali concentration and 3 h KOH treatment. The activated carbons prepared from HPR of poplar gave the highest BET surface area (3066 m2·g-1) and pore volume (1.32 cm3·g-1). The pore structures of activated carbons can be controlled to some extent by changing the removal degree of hemicellulose. The activated carbon obtained under the optimized conditions showed excellent adsorption capacity for toluene (733 mg·g-1) and dichloromethane (184 mg·g-1). The correlation between adsorption properties and pore structure shows that the adsorption capacities of toluene and dichloromethane were closely related to micropores (＜ 2 nm) and ultramicropores (＜ 0.6 nm) of activated carbon, respectively. The pre-extraction of hemicellulose greatly improved the volatile organic compound (VOC) adsorption capacity of activated carbons by increasing the percentage of micropores.

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Dynamic adsorption behavior of benzene, toluene, and xylene VOCs in single- and multi-component systems by activated carbon derived from defatted black cumin (Nigella sativa L.) biowaste

Cited by 48 publications

References 68 publications

Synthesis of corncob biochar with high surface area by KOH activation for VOC adsorption: effect of KOH addition method

Synthesis of corncob biochar with high surface area by KOH activation for VOC adsorption: effect of KOH addition method

New Porous Carbon Material Derived from Carbon Microspheres Assembled in Hollow Carbon Spheres and Its Application to Toluene Adsorption

Preparation of high-performance activated carbons from hemicellulose pre-extracted residues of poplar and their application in VOCs removal

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