Insight into the significant roles of microstructures and functional groups on carbonaceous surfaces for acetone adsorption

Yu, Xinjie; Liu, Shaojun; Lin, Guo‐Qiang; Zhu, Xuecheng; Zhang, Shuo; Qu, Ruiyang; Zheng, Chenghang; Gao, Xiang

doi:10.1039/c8ra03099e

Cited by 40 publications

(10 citation statements)

References 64 publications

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“…In general, high specific surface area and total pore volume produce excellent VOC adsorption capacity. There have been several literature reports of a close correlation between the microporous specific surface area/microporous pore volume of materials and the adsorption capacity of biochar with a similar specific surface area of adsorbent 38 . Wang et al 39 .…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…Given these facts, it could be said that at the beginning acetol adsorption is promoted due to its higher interaction with the activated carbon surface, but then the effect of the heterogeneous sites of adsorption decreases the initial favourable behaviour. The high interaction between acetol and activated carbon could be due to the interaction with carbonyl groups over the carbon surface, as this takes place in acetone [17]. It can be seen in Figure 3 that in the solute concentration lower than 0.5 M there are few differences between the 1,2-propanediol, glycerol and ethylene glycol data, although ethylene glycol shows the lowest values.…”

Section: Single-compound Adsorptionmentioning

confidence: 92%

“…Some authors, who studied different compounds, consider that these oxidized groups could be the sites of adsorption and that the mechanism of adsorption is based on π-π interaction, hydrogen bonding and dispersion interaction between the solute and the surface [16][17][18]. In addition, compounds with shorter length chains are expected to be less adsorbed due to their lower interaction with the surface, and it has been postulated that micropore volume provides most of the active sites [17,19,20]. Yu et al [17] proposed that micropores might be the crucial factor for acetone adsorption over activated carbons.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, compounds with shorter length chains are expected to be less adsorbed due to their lower interaction with the surface, and it has been postulated that micropore volume provides most of the active sites [17,19,20]. Yu et al [17] proposed that micropores might be the crucial factor for acetone adsorption over activated carbons. They determined high linear coefficients of both microporous surface area and micropore volume with adsorption amount.…”

Section: Introductionmentioning

confidence: 99%

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An Insight into the Separation of 1,2-Propanediol, Ethylene Glycol, Acetol and Glycerol from an Aqueous Solution by Adsorption on Activated Carbon

et al. 2021

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Glycerol conversion processes such as aqueous phase reforming and hydrogenolysis generate value-added compounds highly diluted in water. Because distillation is a high energy demand separation step, adsorption could be an attractive alternative to recover these chemicals. Adsorption isotherms of 1,2-propanediol, acetol, ethylene glycol and glycerol onto activated carbon were determined by batch adsorption experiments. These isotherms were fitted slightly better to the Freundlich equation than to the Langmuir equation. Acetol is the compound with the highest adsorption at concentrations smaller than 1 M. Properties of the adsorbate such as the −OH group number, chain length, molecular size and dipole moment, besides characteristics of the adsorbent such as the surface area, oxygen and ash content, are considered to explain the observed results. Moreover, adsorption experiments were performed with mixtures of compounds and it was determined that the molar amount adsorbed is less than predicted from the adsorption isotherms of the individual compounds treated separately. In addition, the influence of the activated carbon thermal pre-treatment temperature on the adsorption capacity has been studied, the optimum being 800 °C. An analysis of the influence of the activated carbon characteristics showed that the most important parameters are the total pore volume and the ash content.

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“…The BTC ligand with enhanced solubility in the synthesis inhibited the pores filling and concurrently increased the amount of mesopores in MIL-0.05Na [24]. The synergistic effect of hierarchical pores with molecular accessibility and abundant adsorption sites further provided the enhanced acetone adsorption capacity [29].…”

Section: Adsorption Studies Over Acetonementioning

confidence: 99%

Influence of alkalinization over MIL-100(Fe) for enhanced VOCs adsorbents

Xie¹,

Thomas²,

Chang³

et al. 2021

Preprint

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Substantial attempts have been undertaken for the improvement of the air quality over decades; and Volatile Organic Compounds (VOCs) from the chemical and textile industries are truly listed as severe issue to be controlled. To come up with modus operandi for this issue, a novel composite of metal organic frameworks (MOFs) MIL-100(Fe) with salient tuned features of natrite was designed by a green and facile method. Mineralized composite MIL-100(Fe) exhibited enhanced crystallinity than pure MIL-100(Fe) as well showcased a higher surface area of 1300 m2g− 1. Through dynamic acetone pressure swing adsorption setup, MIL-0.05Na revealed an enhanced acetone adsorption of 210 mg g− 1 at room temperature. Gas phase adsorption isotherms confirmed the mono layer adsorption behavior. The kinetics models evaluated that the external mass transfer was the rate limiting step for surface adsorption. The thermodynamic study manifested that the adsorption reaction was spontaneous and exothermic. The proposed mechanism of adsorption was the act of physisorption which enriched the adsorbents reusability. This research work provides a futuristic vista to design mineralized Fe-MOFs composites for an energy saving adsorbents for VOCs removal.

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Insight into the significant roles of microstructures and functional groups on carbonaceous surfaces for acetone adsorption

Abstract: To understand the roles of pore structures and functional groups on acetone adsorption, activated carbons (ACs) with different properties were obtained by surface modification.

Cited by 40 publications

References 64 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

An Insight into the Separation of 1,2-Propanediol, Ethylene Glycol, Acetol and Glycerol from an Aqueous Solution by Adsorption on Activated Carbon

Influence of alkalinization over MIL-100(Fe) for enhanced VOCs adsorbents

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