Carbon Fibers Obtained from Flax and Their Adsorption Performance in the Removal of Cu(II) and Co(II) from Aqueous Solutions

Abstract

The systematic studies on oxidation of carbon fibers with nitric acid are presented. The carbon fibers were synthesized from the low‐cost and natural stock (flax fibers) via the controlled carbonization. The non‐oxidized and surface oxidized carbon fibers were thoroughly characterized by means of electron microscopy, FT‐IR spectroscopy, thermogravimetry, point of zero charge determination, Boehm titration and nitrogen adsorption at 77K. The second part of this work was focused on the evaluation of adsorption properties of oxidized carbon fibers and their potential in the removal of copper(II) and cobalt(II) ions from aqueous solutions. The obtained results bring a conclusion that the concentration of nitric acid is a key parameter which drives the content of oxygen surface groups, thermal stability and adsorption performance of carbon fibers. The obtained oxidized carbon fibers were found to be prospective adsorbents of CuII and CoII from aqueous solutions.

Experimental study of CO2 and N2 adsorption on activated carbon

“…Another study on the adsorption process, Maciej et al, [12] have studied the performance of carbon fibers in the removal of Cu and Co from aqueous solutions. Similarly, Junwei Y et al, [13,14] have examined the efficiency of activated carbon fibers during the adsorption of Cu (II).…”

Activated carbon fiber modified with hyperbranched polyethylenimine and phytic acid for the effective adsorption and separation of In(iii)

“…12 It has shown potential applications in the adsorption of metals ions and organic compounds. [13][14][15] However, its application in aqueous systems is limited by the problems of strong hydrophobicity, poor selectivity, and few surface functional groups. The basic properties of a promising adsorbent are a stable matrix and effective functional groups.…”

Amino‐Decorated Activated Carbon Fibers with Efficient Static Adsorptivity for Low‐Concentration Formaldehyde Gas in a Confined Space

“…Activated carbon fiber (ACF), as a porous adsorbent based on microporous structure, have a large number of micropore structures open directly on the surface, which determine its excellent physical adsorption properties. Hence, ACF is considered as a promising adsorbent for the purification of various adsorbates, such as Cu(II), [6] HCl, [7] sulfur dioxide [8] and formaldehyde [9] et al..…”