scholarly journals Preparation of Nano-Porous Carbon-Silica Composites and Its Adsorption Capacity to Volatile Organic Compounds

Processes ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 372 ◽  
Author(s):  
Lipei Fu ◽  
Jiahui Zhu ◽  
Weiqiu Huang ◽  
Jie Fang ◽  
Xianhang Sun ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Adsorption Capacity ◽  
Organic Compounds ◽  
Retention Rate ◽  
Reaction System ◽  
Carbon Powder ◽  
Volatile Organic ◽  
Adsorption Desorption ◽  
Better Than

Carbon-silica composites with nanoporous structures were synthesized for the adsorption of volatile organic compounds (VOCs), taking tetraethyl orthosilicate (TEOS) as the silicon source and activated carbon powder as the carbon source. The preparation conditions were as follows: the pH of the reaction system was 5.5, the hydrophobic modification time was 50 h, and the dosage of activated carbon was 2 wt%. Infrared spectrum analysis showed that the activated carbon was dispersed in the pores of aerogel to form the carbon-silica composites material. The static adsorption experiments, dynamic adsorption-desorption experiments, and regeneration experiments show that the prepared carbon-silica composites have microporous and mesoporous structures, the adsorption capacity for n-hexane is better than that of conventional hydrophobic silica gel, and the desorption performance is better than that of activated carbon. It still has a high retention rate of adsorption capacity after multiple adsorption-desorption cycles. The prepared carbon-silica composites material has good industrial application prospects in oil vapor recovery, providing a new alternative for solving organic waste gas pollution.

Deciphering the Adsorption Behavior of Volatile Organic Compounds with Electrospun Polyacrylonitrile/Molecular Sieve Nanocomposites

2019 ◽  
Vol 19 (11) ◽  
pp. 7315-7319 ◽  
Author(s):  
Yi-Xin Wang ◽  
Hong Tao ◽  
Min-Nan Chen ◽  
Ling-Shao ◽  
Guang-Feng Shang ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Adsorption Capacity ◽  
Organic Compounds ◽  
Molecular Sieve ◽  
Fiber Surface ◽  
Polyacrylonitrile Fiber ◽  
Volatile Organic ◽  
New Type ◽  
Short Time ◽  
Adsorption Desorption

In this study, a new type of molecular sieve/polyacrylonitrile fiber (M-PAN) was prepared by electrospinning to adsorb atmospheric volatile organic compounds (VOCs). The suitable content of molecular sieve in nanocomposites was also determined for achieving maximum VOCs adsorption capacity. SEM, TEM and N2 adsorption/desorption analyzer were performed for characterization of the surface morphology, structural properties, surface area and pore size. A part of molecular sieve is exposed on the fiber surface where VOCs can be adsorbed efficiently in a short time. Acetone was used as a challenge pollutant to evaluate the adsorption of VOCs at different recycling times and types of electrospinning nanofibers. The adsorption capacity of 6M-PAN (60% weight of molecular sieve) nanofiber reached 58.2 μg g−1 and the reused nanofibers nearly had the same adsorption capacity as the newly prepared nanofibers after several times of recirculation.

scholarly journals Straw-Based Activated Carbon: Optimization of the Preparation Procedure and Performance of Volatile Organic Compounds Adsorption

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3284
Author(s):  
Zhen Li ◽  
Yonghong Li ◽  
Jiang Zhu
Keyword(s):  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Ethyl Acetate ◽  
Adsorption Capacity ◽  
Organic Compounds ◽  
Activated Carbons ◽  
Carbonization Temperature ◽  
Gravimetric Analysis ◽  
Impregnation Ratio ◽  
Volatile Organic

Straw is one of the largest agricultural biowastes and a potential alternative precursor of activated carbon. Activated carbon prepared from different types of straw have great differences in structure and adsorption performance. In order to explore the performance of different straw-based activated carbon in volatile organic compounds adsorption, five common straws were selected as potential source materials for the preparation of SAC. The straw-based activated carbons were prepared and characterized via a thermo-gravimetric analysis, scanning electron microscope and the Brunauer–Emmett–Teller method. Among the five straw-based activated carbons, millet straw-derived activated carbon exhibited superior properties in SBET, Smic and adsorption capacities of both toluene and ethyl acetate. Furthermore, the preparation process of millet straw activated carbon was optimized via response surface methodology, using carbonization temperature, carbonization time and impregnation ratio as variables and toluene adsorption capacity, ethyl acetate adsorption capacity and activated carbon yield as responses. The optimal preparation conditions include a carbonization temperature of 572 °C, carbonization time of 1.56 h and impregnation ratio (ZnCl2/PM, w/w) of 1.60, which was verified experimentally, resulting in millet straw activated carbon with a toluene adsorption capacity of 321.9 mg/g and ethyl acetate adsorption capacity of 240.4 mg/g. Meanwhile, the adsorption isothermals and regeneration performance of millet straw activated carbon prepared under the optimized conditions were evaluated. The descriptive ability of the isothermals via the Redlich–Peterson equation suggests a heterogeneous surface on millet straw activated carbon. Recyclability testing has shown that millet straw activated carbon maintained a stable adsorption capacity throughout the second to fifth cycles. The results of this work indicate that millet straw activated carbon may be a potential volatile organic compound adsorbent for industrial application.

scholarly journals Hierarchically Porous Silk/Activated-Carbon Composite Fibres for Adsorption and Repellence of Volatile Organic Compounds

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1207
Author(s):  
Aled D. Roberts ◽  
Jet-Sing M. Lee ◽  
Adrián Magaz ◽  
Martin W. Smith ◽  
Michael Dennis ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Carbon Composite ◽  
Hierarchically Porous ◽  
Surface Areas ◽  
Regenerated Silk Fibroin ◽  
Volatile Organic ◽  
Fibre Spinning ◽  
Solution Blow Spinning

Fabrics comprised of porous fibres could provide effective passive protection against chemical and biological (CB) threats whilst maintaining high air permeability (breathability). Here, we fabricate hierarchically porous fibres consisting of regenerated silk fibroin (RSF) and activated-carbon (AC) prepared through two fibre spinning techniques in combination with ice-templating—namely cryogenic solution blow spinning (Cryo-SBS) and cryogenic wet-spinning (Cryo-WS). The Cryo-WS RSF fibres had exceptionally small macropores (as low as 0.1 µm) and high specific surface areas (SSAs) of up to 79 m2·g−1. The incorporation of AC could further increase the SSA to 210 m2·g−1 (25 wt.% loading) whilst also increasing adsorption capacity for volatile organic compounds (VOCs).

Double-bed-type extraction needle packed with activated-carbon-based sorbents for very volatile organic compounds

2014 ◽  
Vol 88 ◽  
pp. 423-428 ◽  
Author(s):  
Ikuo Ueta ◽  
Emi Liana Samsudin ◽  
Ayako Mizuguchi ◽  
Hayato Takeuchi ◽  
Takumi Shinki ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Volatile Organic ◽  
Carbon Based
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