Enhanced removal efficiency of toluene over activated carbon under visible light

Saqlain, Shahid; Zhao, Shufang; Kim, Soong Yeon; Kim, Young Dok

doi:10.1016/j.jhazmat.2021.126317

Cited by 9 publications

(3 citation statements)

References 55 publications

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“…Activated carbon (AC) is widely used as an adsorbent for the removal of pollutants due to its large specific surface area and abundant surface functional groups (Isinkaralar et al, 2022). It has obvious advantages in the treatment of gaseous pollutants, such as benzene, toluene, formaldehyde, etc (Saqlain et al, 2021). However, the extensive use of traditional activated carbon raw materials, such as coal and wood, will cause large consumption of fossil fuels and huge losses of forest resources, and significantly reduce the environmental friendliness of AC.…”

Section: Introductionmentioning

confidence: 99%

Performance optimization and kinetic analysis of HNO3 coupled with microwave rapidly modified coconut shell activated carbon for VOCs adsorption

et al. 2023

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As a typical carbon-based material, activated carbon (AC) has satisfied adsorption performance and is of great significance in the field of volatile organic compounds (VOCs) pollutants removal. In order to further reveal the optimization mechanism of AC adsorption performance, coconut shell-based AC was selected as the research object, and different concentrations of HNO3 coupled with microwave were used for rapid modification and activation. The characteristic changes of pore structure and surface chemical of AC before and after rapid modification were analyzed, and the performance changes of VOCs absorption were discussed from the perspective of reaction kinetics. The pore structure and surface chemical properties of before and after modification were analyzed by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmeta-Teller (BET) analysis, Fourier Transform Infrared Spectroscopy (FTIR), and Boehm titration. The results showed that HNO3 coupled with microwave could significantly eliminate impurities in the pores of AC. After impregnation in HNO3 at a concentration of 1.5 mol L−1 and under microwave irradiation of 900 W, the number of micropore on the surface of samples increased slightly. When the impregnation concentration of HNO3 continued to increase, the two adjacent pore structures of the samples merged, which lead to a large decrease in the number of micropore and a corresponding increase in the proportion of mesoporous. Meanwhile, the specific surface area SBET of the modified NAC-6 sample increased to 1,140.40 m2 g−1, and the total acidic oxygen-containing functional groups on the surface increased by 0.459 mmol g−1 compared to that of the unmodified raw carbon. Furthermore, by analyzing the experimental results of formaldehyde adsorption on AC samples, it was concluded that the saturated adsorption capacity of the modified NAC-6 sample was 43% higher than that of the raw carbon. This study provides a more convenient and faster modification method for AC in the field of gas phase pollutants purification, which is helpful to realize the practical engineering application of AC with high efficiency, energy saving and sustainable.

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Section: Introductionmentioning

confidence: 99%

Performance optimization and kinetic analysis of HNO3 coupled with microwave rapidly modified coconut shell activated carbon for VOCs adsorption

et al. 2023

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“…Adsorption is low in cost and can be easily applied to operation . Activated carbon has been widely used as an adsorbent for removing pollutants due to its large specific surface area, well-developed pore structure, abundant functional groups, and reusability. , Activated carbon has significant advantages in the treatment of gaseous pollutants, such as formaldehyde, toluene, benzene, etc . Furthermore, activated carbon is relatively cheaper than other adsorbates and low investment is required .…”

Section: Introductionmentioning

confidence: 99%

“… 4 , 5 Activated carbon has significant advantages in the treatment of gaseous pollutants, such as formaldehyde, toluene, benzene, etc. 6 Furthermore, activated carbon is relatively cheaper than other adsorbates and low investment is required. 7 The surface functional groups and pore structures of activated carbon are the key factors to impact its adsorption performance to formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Combustion Characteristics of Activated Carbon Modified via Liquid Phase Impregnation during Drying

Li,

Zhang,

Lyu

et al. 2023

ACS Omega

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Spontaneous combustion characteristics are important issues for the safe operation of the wet-modified activated carbon drying process. The spontaneous combustion characteristics of activated carbon modified via liquid phase impregnation were fully investigated in this study. The modified activated carbon was prepared using columnar activated carbon and 4-amino-1,2-butanediol solution. Physical properties and surface functional group analyses were performed for activated carbon before and after modification. The ignition temperature of activated carbon before and after modification was then characterized using the methods of GB/T20450–2006, thermogravimetry–derivative thermogravimetry (TG-DTG), and TG–mass spectrometry (TG-MS). At the same time, the activation energy of activated carbon before and after modification was calculated by using thermodynamic analysis. Furthermore, a new self-designed test platform was introduced to investigate the spontaneous combustion characteristics of wet-modified activated carbon under the drying temperatures of 150, 175, 180, and 210 °C. The results show that the specific surface area of Brunauer, Emmett, and Teller (BET) is decreased by 368 m 2 ·g –1 , the total volume of pore size is decreased by 0.17 cm 3 ·g –1 , and the content of oxygen-containing functional groups is decreased by 0.071 mmol/g compared with row activated carbon. The ignition temperatures of the sample before modification characterized by the three methods are 483, 596, and 599 °C, respectively. The ignition temperatures of the sample after modification are 489, 607, and 611 °C, respectively. The activation energy of the modified activated carbon is increased by 35 kJ/mol compared to the original activated carbon. It is concluded that the temperature that triggers the modified activated carbon combustion during the drying process is between 175 and 180 °C, and the heat is mainly gathered at the longitudinal center of the combustion chamber through the investigation of spontaneous combustion experiments. The results in this study can contribute to safe production to prevent combustion in the process of modifying activated carbon during the drying process.

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Efficacious removal of benzene and ammonia gases over visible light irradiated activated carbon

Jeong

Zhao

et al. 2023

Applied Surface Science

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Enhanced removal efficiency of toluene over activated carbon under visible light

Cited by 9 publications

References 55 publications

Performance optimization and kinetic analysis of HNO3 coupled with microwave rapidly modified coconut shell activated carbon for VOCs adsorption

Performance optimization and kinetic analysis of HNO3 coupled with microwave rapidly modified coconut shell activated carbon for VOCs adsorption

Spontaneous Combustion Characteristics of Activated Carbon Modified via Liquid Phase Impregnation during Drying

Efficacious removal of benzene and ammonia gases over visible light irradiated activated carbon

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