Abstract
The present study describes the removal of salicylic acid (SA) from water by adsorption using ethylene diamine (EDA)‐functionalized carbon nanofibers (CNFs)‐containing porous carbon beads (∼0.5 mm). Briefly, the phenolic beads, separately synthesized using suspension polymerization, were carbonized and activated. The CNFs were grown on the carbon beads, using chemical vapor deposition, and the prepared fibrous beads functionalized with EDA were used as an adsorbent for SA. The prepared materials were characterized by their physico‐chemical properties, including specific surface area, surface morphology, and surface functional groups. The adsorption tests performed over the initial SA concentration range of 100–1500 mg/L revealed the adsorption capacity of the materials to be ∼682 mg/g, which was considerably larger than that of the adsorbents discussed in the literature for SA. The zeta‐potential analysis attributed enhanced adsorption to the electrostatic interaction and hydrogen bonding between the solute molecules and the EDA‐functionalized surface of the CNFs. The material and method developed in this study for the remediation of the SA‐laden wastewater may be extended to other acidic pollutants present in pharmaceutical effluents.
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