Effects of activation temperature on the properties and structure of PAN‐based activated carbon hollow fiber

Abstract

Polyacrylonitrile (PAN) hollow fibers were pretreated with ammonium dibasic phosphate, then further oxidized in air, carbonized in nitrogen, and activated with carbon dioxide. The effects of activation temperature of a precursor fiber on the microstructure, specific surface, poresize distribution, and adsorption properties of PAN-based activated carbon hollow fibers (PAN-ACHF) were studied in this work. After the activation process, the BET surface area of the PAN-ACHF and surface area of mesopores in the PAN-ACHF increased very remarkably and reached 1422 m 2 g Ϫ1 and 1234 m 2 g Ϫ1 , respectively, when activation temperature is 1000°C. The adsorptions to creatinine and VB 12 of PAN-ACHF were much high and reached 99 and 84% respectively. In PAN-ACHF which went through the activation at 700°C and 800°C, the micropore filling mainly occurred at low relative pressures, multimolecular layer adsorption occurred with the increasing of relative pressure, and the filling and emptying of the mesopores by capillary condensation occurred at high relative pressures. But in PAN-ACHF which went through the activation at 900°C, a mass of mesopores resulted in the large pore filling by capillary condensation. The dominant pore sizes of mesopores in PAN-ACHF are from 2 nm to 5 nm.

Thermal transformation of polyacrylonitrile deposited on SBA-15 type silica

“…As a high-melting, rigid and spinnable duroplast, PAN is a very useful raw material for the preparation of microporous activated carbon and carbon fibers by controlled pyrolysis followed by an appropriate chemical and/or thermal activation [1][2][3][4]. PAN-derived activated carbons are applied as the adsorbents for the removal of heavy metal ions and organic pollutants from aqueous solutions as well as volatile organic compounds (VOCs) from exhaust gases [5][6][7].…”

Structure and properties of PAN‐based activated carbon hollow fibers: Effect of ammonium dibasic phosphate pretreatment

“…Recently, the PAN‐based activated carbon hollow fibers (PAN‐ACHF) brought on many investigators' interests,3–8 as PAN‐ACHF shows the largest adsorption capacity among the carbon surfaces. In a previous study,9–14 we reported effects of oxidation, carbonization, activation on the properties, and structure of PAN‐ACHF.…”

Fabrication and Structural Characterization of Polyacrylonitrile and Carbon Nanofibers Containing Plasma-Modified Carbon Nanotubes by Electrospinning

“…15 There are several precursors for the production of carbon fiber, such as polyacrylonitrile (PAN), pitch and cellulose. [16][17][18][19][20] PAN is the most widely used precursor for manufacturing high-performance fibers due to its combination of tensile and compressive properties as well as its high carbon yield. 21 Electrospinning is no longer applied only to organic materials.…”

“…The electrospinning technique, invented in the 1930s, has recently gained renewed interest because it can spin a variety of ultrafine polymer fibers at the nanoscale at low cost . There are several precursors for the production of carbon fiber, such as polyacrylonitrile (PAN), pitch and cellulose. − PAN is the most widely used precursor for manufacturing high-performance fibers due to its combination of tensile and compressive properties as well as its high carbon yield …”