Surface modified mechanism of activated carbon fibers by thermal chemical vapor deposition and nitrate adsorption characteristics in aqueous solution

Yuan, Jinghan; Amano, Yoshimasa; Machida, Motoi

doi:10.1016/j.colsurfa.2019.123710

Cited by 24 publications

(4 citation statements)

References 26 publications

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“…The kinetic constant in this equation is written as kab (L/mg min), the linear flow velocity is written as u (cm/min), and the saturation concentration is written as Nab (mg/L) [24]. The parameter values for kab and Nab were obtained by plotting the function ln(Ct/C0) versus t and calculating its slope and intercept [25]. The initial xylene concentration and intake flow rate both altered regarding the kinetic constant kab.…”

Section: Adams-bohart Modelmentioning

confidence: 99%

Removal of BTEX (Benzene, Toluene, Ethyl benzene and Xylene) from aqueous solutions using surface-modified zeolite

2022

Global NEST: The International Journal

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<p>BTEX, also known as benzene, toluene, ethyl benzene, and xylene, is a common gasoline oxygenate. The contamination of groundwater and surface water with BTEX and its primary breakdown product has drawn a lot of attention. However, surface-modified zeolite's sorption mechanisms and affinity for BTEX can be employed to potentially remove these toxins from water. Tert-butyl alcohol (TBA) was utilized to alter the morphology of the adsorbent. Based on the findings, it can be concluded that zeolites have a greater capability for removing emerging chemicals. Some of the emerging compounds' relatively large dimensions limit their natural ability to lower values. Gas chromatography was used to determine the BTEX concentration decrease range. The Yoon-Nelson and Adams-Bohart model's use of mathematical modelling to determine the efficacy of the column's adsorption. The model with the highest R2 values for characterizing equilibrium isotherm data describes equilibrium adsorption data. To gain an understanding of the shape, pore structure, and active sites, the characterisation is concentrated on quantitative analysis using XRD, qualitative analysis using FTIR, and optical study using SEM.</p>

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Section: Adams-bohart Modelmentioning

confidence: 99%

Removal of BTEX (Benzene, Toluene, Ethyl benzene and Xylene) from aqueous solutions using surface-modified zeolite

2022

Global NEST: The International Journal

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“…Carbon fiber surface sizing is an important step in industrial production, which can enhance the agglomeration of carbon fiber and prevent the carbon fiber from being damaged during processing [ 14 ]; and the sizing agent simultaneously plays the roles of lubricant and coupling agent [ 15 , 16 ], which effectively improves the wettability of the carbon fiber [ 17 , 18 , 19 , 20 ] and enhances the interfacial properties of the composites. Compared to chemical grafting, plasma treatment, electrochemical oxidation, chemical vapor deposition and other modification methods [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ], carbon fiber sizing is simple and efficient, with little damage to the mechanical properties of the fiber itself. However, some of the new sizing agents contain strong polar organic solvents.…”

Section: Introductionmentioning

confidence: 99%

A Water-Soluble Thermoplastic Polyamide Acid Sizing Agents for Enhancing Interfacial Properties of Carbon Fibre Reinforced Polyimide Composites

Huang,

Zhang,

et al. 2024

Materials

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Carbon-fiber-reinforced polyimide (PI) resin composites have gained significant attention in the field of continuous-fiber-reinforced polymers, in which the interfacial bonding between carbon fiber and matrix resin has been an important research direction. This study designed and prepared a water-soluble thermoplastic polyamide acid sizing agent to improve the wettability of carbon fiber, enhance the van der Waals forces between carbon fiber and resin and strengthen the chemical bonding between the sizing agent and the alkyne-capped polyimide resin by introducing alkyne-containing functional groups into the sizing agent. This study found that the addition of a sizing layer effectively bridged the large modulus difference between the fiber and resin regions, resulting in the formation of an interfacial layer approximately 85 nm thick. This layer facilitated the transfer of stress from the matrix to the reinforced carbon fiber, leading to a significant improvement in the interfacial properties of the composites. Adjusting the concentration of the sizing agent showed that composites treated with 3% had the best interfacial properties. The interfacial shear strength increased from 82.08 MPa to 108.62 MPa (32.33%) compared to unsized carbon fiber. This research is significant for developing sizing agents suitable for carbon-fiber-reinforced polyimide composites.

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“…Equilibrium adsorption amount (Q e ) of each AC and ACF was listed in Table 1. [13][14][15][16] Ammonization at high temperature and thermal chemical vapor deposition (CVD) with acetonitrile enhanced the adsorption capacity. These studies revealed that the quaternary nitrogen (N-Q) could be an effective adsorption site for nitrate ion.…”

Section: Introductionmentioning

confidence: 99%

“…The precursor with a high nitrogen content and/or the modification using nitrogen-containing substances were applied to introduce a sufficient amount of N-Q in ACs and ACFs. [13][14][15] There is a need for the development of a method to efficiently introduce N-Q into ACFs. However, in the case of using ACFs, even if N-Q is introduced, adsorption sites other than N-Q were always observed.…”

Section: Introductionmentioning

confidence: 99%

Nitrate Ion Adsorption Characteristics of Activated Carbon Fibers with and without Quaternary Nitrogen Effective for Anion Adsorption

2020

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By comparing the two types of activated carbon fibers (ACFs), characteristics of adsorption sites for nitrate ion other than quaternary nitrogen (N-Q) were investigated. Using phenol resin as precursors, activation with ZnCl 2 was performed, and then heat treatment at 950 °C was carried out to prepare ACFs without N-Q, while ACFs with N-Q was prepared in the same method using polyacrylonitrile-based carbon fiber as precursors. We assessed the amount of functional groups, elemental composition, porous properties, and model of unit crystal size of graphene. For both ACFs with N-Q and without N-Q, equilibrium adsorption amount was not always simply proportional to surface area, but to the average number of benzene rings (Bzrings) of graphene universally. PhR-5.0Z4 had only 20 benzene rings per graphene unit, but after heat treatment at 950 °C, the number drastically increased to 1088 (PhR-5.0Z4-9.5HT30). However, when the ACFs contained a large amount of oxygen, the number of Bz-rings was limited to 792 (PhR-5.0Z4-Ox-9.5HT30) even after heat treatment at 950 °C, and did not increase sufficiently. Cπ sites are more susceptible to oxygen inhibition than N-Q in adsorbing nitrate ions. For ACFs having Cπ sites as main adsorption sites, the heat treatment at 950 °C without oxidation can enhance the nitrate ion adsorption capacity.

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Surface modified mechanism of activated carbon fibers by thermal chemical vapor deposition and nitrate adsorption characteristics in aqueous solution

Cited by 24 publications

References 26 publications

Removal of BTEX (Benzene, Toluene, Ethyl benzene and Xylene) from aqueous solutions using surface-modified zeolite

Removal of BTEX (Benzene, Toluene, Ethyl benzene and Xylene) from aqueous solutions using surface-modified zeolite

A Water-Soluble Thermoplastic Polyamide Acid Sizing Agents for Enhancing Interfacial Properties of Carbon Fibre Reinforced Polyimide Composites

Nitrate Ion Adsorption Characteristics of Activated Carbon Fibers with and without Quaternary Nitrogen Effective for Anion Adsorption

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