Indispensable role of inherent calcite in coal on activated carbon (AC)’s preparation and applications

Zhang, Huirong; Niu, Jian; Guo, Yanxia; Cheng, Fangqin

doi:10.1016/j.fuel.2020.119481

Cited by 25 publications

(4 citation statements)

References 31 publications

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“…This shows that the prepared PCBAs have small crystal face size, large crystal face spacing and high amorphous degree. Low degree of graphitization is conducive to the formation of more developed pore structure, so as to provide more adsorption active sites and improve adsorption performance 30,31 …”

Section: Resultsmentioning

confidence: 99%

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Preparation of carbon black‐based porous carbon adsorbents and study of toluene adsorption properties

Chen

Fan

et al. 2022

J of Chemical Tech & Biotech

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Background Carbon black, which has a low utilization rate, is a powdered carbon material produced by incomplete combustion or decomposition of hydrocarbons. Carbon black is used in rubber, coating and ink industries, the product quality will be affected due to its powder structure, and serious environmental pollution will be caused in the stacking process. However, carbon black used as the raw material for the preparation of porous carbon materials with high volatile organic compounds (VOCs) adsorption capacity, which can realize the resource utilization of carbon black and environmental protection. Results Porous carbon based adsorbents (PCBAs) were prepared by low‐temperature physical pore‐forming and high‐temperature chemical pore‐forming with waste carbon black as raw material and (NH4)2CO3 as pore‐forming agent. The high pore‐forming temperature was beneficial to the pore structure to be formed. The surface morphology of the prepared PCBAs was more wrinkled and loose, and the specific surface area, micropore ratio and graphitization degree showed a volcanic change trend with the increase of pore‐forming temperature. The micropore ratio reached the maximum (81.7%) and the graphitization degree reached the maximum (ID/IG = 1.15) at the pore‐forming temperature of 850 °C. When the pore‐forming temperature was 850 °C, the toluene saturated adsorption capacity of PCBA850 adsorbent was 298.9 mg/g. In addition, the kinetic fitting results show that the adsorption behavior of toluene molecules on the adsorbent is mainly affected by the pore diffusion. Conclusion Although increasing pore‐forming temperature did not change the surface chemical properties of PCBAs, high temperature pore‐forming could significantly increase the microporosity and surface area of PCBAs. The high microporous ratio and specific surface area can provide more active sites for toluene adsorption, thus improving the toluene adsorption performance of the porous carbon‐based adsorbent. In addition, the PCBA adsorbent prepared at 850 °C can restore the toluene adsorption performance at 120 °C, which provides a possibility for its practical application. © 2022 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

“…Low degree of graphitization is conducive to the formation of more developed pore structure, so as to provide more adsorption active sites and improve adsorption performance. 30,31 Raman study…”

Section: Xrd Characterizationmentioning

confidence: 99%

Preparation of carbon black‐based porous carbon adsorbents and study of toluene adsorption properties

Chen

Fan

et al. 2022

J of Chemical Tech & Biotech

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“…Các nghiên cứu đã chỉ ra rằng với cấu trúc lớp tương tự nhau (2D-2D), sự kết hợp giữa vật liệu carbon và g-C3N4 là một cách hiệu quả để khắc phục các nhược điểm của mỗi vật liệu riêng lẻ, đồng thời tạo ra composite có tính chất quang, điện độc đáo cũng như hoạt tính xúc tác cao. Ngoài ra, nhóm nghiên cứu Huirong Zhang và cộng sự [12] cũng điều chế than hoạt tính từ than đá với sự bổ sung của canxi carbona t làm chất hấp phụ để loại RhB khỏi nước.…”

Section: Giới Thiệu Chungunclassified

Synthesis of C/g-C3N4 composite with enhanced photocatalytic activity under visible light

Thi¹,

Thuy²,

Huu³

et al. 2022

Vietnam j. catal. adsorp.

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In this study, banana-peel-derived carbon/g-C3N4 (BC/CN) composite was prepared by a facile calcinating method from the urea (NH2)2CO and banana-peel-derived carbon (BC) precursors. Whereas, the banana-peel-derived carbon was prepared from the waste banana peel as biomass source. The obtained composite was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and N2 adsorption–desorption isotherms. The results showed that the BC/CN composite had the higher photocatalytic activities in the degradation Rhodamine B (85%) compared to the pristine g-C3N4 (31%) under visible light. This shows that the BC/CN composite as a promising new material with low cost for photodegradation of organic pollutants in wastewater

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“…The mechanical strength and permeability are important properties to consider when satisfying the PRB installation requirements. Among these reactive materials, AC is preferred because of its large source of raw materials and high adsorption e ciency (Zhang et al, 2021;Lan et al, 2023). AC has been demonstrated to have a high adsorption capacity with an extensive surface area compared with conventional materials (Feizi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Aqueous benzene, toluene, ethylbenzene and xylene (BTEX) removal using core-shell structure activated carbon ball as a permeable reactive barrier material

Myung,

Kim,

Choi

et al. 2024

Preprint

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Permeable reactive barriers (PRBs) are passive and sustainable treatment systems for remediating the diffusion of contaminant plumes in groundwater. Several conventional reactive materials such as activated carbon (AC) have long been used as reactive media for PRBs. AC, which is known for its high adsorption capability and cost-effectiveness, is commonly used to remove multiple pollutants from groundwater. Unfortunately, among the reactive materials, AC can fill in the barrier and pose practical problems, such as a pressure drop, solid losses during handling, and safe disposal of filled sorbents, because of its low particle strength. In this study, AC balls were prepared using zeolite as the core and powdered AC, quartz, and calcite as the shell. AC ball with excellent mechanical strength and high permeability properties in the form of a core–shell layer is a good alternative to conventional reactive materials. The adsorption characteristics of benzene, toluene, ethylbenzene, and p-xylene (BTEX) from solutions using AC balls were investigated. The adsorption equilibrium is in the order of X > E > T > B. To validate the proposed models, batch experiments indicated that the pseudo-2nd-order and Langmuir models were the most suitable for describing the kinetics and equilibrium of benzene and toluene, respectively. Regeneration experiments were performed using chemical extraction (methanol) and microwave (MW) heating. MW heating is a promising alternative regeneration technique for AC balls. A series of experiments (six adsorption–desorption cycles) revealed that AC balls have considerable reusability. Based on these results, AC balls are a potential reactive medium for field-scale PRB practical remediation applications.

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Indispensable role of inherent calcite in coal on activated carbon (AC)’s preparation and applications

Cited by 25 publications

References 31 publications

Preparation of carbon black‐based porous carbon adsorbents and study of toluene adsorption properties

Preparation of carbon black‐based porous carbon adsorbents and study of toluene adsorption properties

Synthesis of C/g-C3N4 composite with enhanced photocatalytic activity under visible light

Aqueous benzene, toluene, ethylbenzene and xylene (BTEX) removal using core-shell structure activated carbon ball as a permeable reactive barrier material

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