Nitrogen plasma modification of viscose-based activated carbon fibers

Huang, Huacun; Ye, Daiqi; Huang, Bichun

doi:10.1016/j.surfcoat.2007.04.029

Cited by 78 publications

(49 citation statements)

References 20 publications

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“…Three different oxygen functional groups, as reported in the studies of Huang et al [38]. The peak at 530.6 eV corresponds to the carbonyl oxygen atoms in esters, amides and anhydrides as well as oxygen atoms in hydroxyls or ethers (carbonyl); the peak at 532.5 eV to the ether oxygen atoms in esters and anhydride (ether); and the peak at 533.4 eV to the oxygen atoms in the carboxyl groups (carboxyl).…”

Section: Surface Functional Groups -Xpsmentioning

confidence: 83%

Enhanced Adsorption of Phenol Using Alkaline Modified Activated Carbon Prepared From Olive Stones

Soudani

Najar-Souissi

Ouederni

2019

J. Chil. Chem. Soc.

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Activated carbon (AC) prepared from olive stone (OSAC) was modified separately by ammoniac (OSAC/AM) and sodium hydroxide (OSAC/H) aqueous solutions impregnation in order to improve their adsorption properties toward phenol. The raw and modified activated carbons were characterized. The porous structure was characterized using N 2 adsorption at 77 K. The surface functional group characteristics were examined by Fourier transform infrared (FTIR) spectroscopy, Boehm titration, the point of zero charge (pH pzc) measurement and X-ray photoelectron spectroscopy (XPS) method. The isotherms of phenol adsorption on the original and modified ACs were measured. After modification, the activated carbon showed enhanced adsorption capacity for phenol. The effect of alkaline solution concentration on adsorption process was investigated. Results showed a decrease of the microporosity of AC after alkalin treatment especially for higher solution concentration. The amounts of the surface basic groups of the modified ACs increased, in comparison with the original AC, with the increase of the alkaline concentration; however the acidic surface groups decreased. The equilibrium adsorption data were best described by Langmuir model. The maximum adsorption capacity of phenol enhanced for ammonia and sodium hydroxide, respectively, compared with the original AC. We noted that the higher alkaline concentration the higher the adsorption capacity of AC for phenol.

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Section: Surface Functional Groups -Xpsmentioning

confidence: 83%

Enhanced Adsorption of Phenol Using Alkaline Modified Activated Carbon Prepared From Olive Stones

Soudani

Najar-Souissi

Ouederni

2019

J. Chil. Chem. Soc.

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“…For instance, polysurface was modified with remote and direct Ar plasma to improve the hydrophilicity. Recently, some of plasma techniques have been applied by some researchers to the surface modification of carbon‐based materials 28–31. Microwave oxygen plasma was used to treat isotropic carbon fiber.…”

Section: Introductionmentioning

confidence: 99%

The surface structure and chemical characters of activated carbon fibers modified by plasma

Zhou

Wang

Zuo

et al. 2011

Asia-Pacific J Chem Eng

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Viscose-based activated carbon fibers (VACFs) were treated by a direct-current (DC) discharge plasma at different conditions. The surface functional groups of VACFs were modified to improve the adsorption and catalysis capacity for SO 2 and NO x . The surface properties of the untreated and treated VACFs which were modified in different feed gases (air, O 2 , N 2 and NH 3 ) were performed by scanning electron microscopy, BET, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared attenuated total reflection spectroscopy (FTIR-ATR). The results show that after being treated with plasma, more particles appeared on the external surface of the VACFs and the surface became rougher, the average pore size decreased but the pore volume and the surface area decreased first and then increased. XPS revealed that DC discharge plasma can remarkably change the distribution of functional groups on the surface of VACFs. FTIR-ATR also indicated that more nitrogen atoms were introduced to the VACFs surface when the feed gas contained nitrogen atoms and N and O atoms were introduced to the surface of VACFs at the same time when the feed gas was air, but it did not happen in the feed gas of N 2 , or O 2 , or NH 3 . Discharge voltage and treatment time were important factors and for our experiment in the feed gas of nitrogen, the optimum modification conditions were 8 kV and 5 min, respectively. 

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“…As functional carbon material, carbon fiber has excellent properties such as high strength, high modulus, high temperature resistance, acid/alkali resistance, and good electrical and thermal conductivity . Polyacrylonitrile‐based carbon fibers (PAN‐CF), pitch‐based carbon fibers and viscose‐based carbon fibers are the typical carbon fibers. PAN‐CF currently occupies more than 90% of the market share, but its production cost is higher than that of pitch‐based carbon fiber ,.…”

Section: Introductionmentioning

confidence: 99%

Chemical Modification of Asphaltene with SEBS as Precursor for Isotropic Pitch‐Based Carbon Fiber

Jiang

Shen

2019

ChemistrySelect

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A high yield spinnable pitch for isotropic pitch-based carbon fiber was successfully prepared by air oxidation polycondensation of asphaltene with styrene-ethylene-butylene-styrene. The effects of reaction temperature and time, added styreneethylene-butylene-styrene amount on the composition and spinning properties of resultant pitches were investigated. The resultant pitch with a concentrated molecular weight distribution of 300-700 Da was prepared at 340°C for 3 h under air blowing with 5% styrene-ethylene-butylene-styrene, moreover, its more alkyl structure (mainly methylene), lower apparent viscosity above the softening point, and good spinnability endowed the resultant pitches more prone to oxygen crosslinking during the stabilization process. The average tensile strength of resultant pitch-based carbon fibers was over 800 MPa after carbonization at 1000°C for 10 min. It provided a simple method to adjust the spinnable pitch for pitch-based carbon fiber preparation.

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Nitrogen plasma modification of viscose-based activated carbon fibers

Cited by 78 publications

References 20 publications

Enhanced Adsorption of Phenol Using Alkaline Modified Activated Carbon Prepared From Olive Stones

Enhanced Adsorption of Phenol Using Alkaline Modified Activated Carbon Prepared From Olive Stones

The surface structure and chemical characters of activated carbon fibers modified by plasma

Chemical Modification of Asphaltene with SEBS as Precursor for Isotropic Pitch‐Based Carbon Fiber

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