In-situ growth of Al/Ni layered double hydroxide onto polyaniline-wrapped sisal fibers for highly efficient removal of pharmaceutical Ketoprofen and Ibuprofen contaminants: Batch and fixed-bed column studies

Abstract

The present study focuses on the in-situ growth of Al/Ni layered double hydroxide onto polyaniline/sisal fibers (SF/PANI/LDH). The main purpose is investigating the effectiveness of this composite material in removing non-steroidal anti-inflammatory artificial pharmaceutical contaminants (ketoprofen (KTP) and ibuprofen (IBP)). The present investigation involves conducting batch and fixed-bed column experiments. Various analytical techniques, namely SEM, FTIR, and XRD, were conducted to analyze prepared adsorbent features. These analyses indicated that Al/Ni layered double hydroxide was successfully coated on the polyaniline-wrapped sisal fibers. The batch study was mainly focused on assessing influencing parameters (solution pH, adsorbent dosage, pollutant concentration, and time), equilibrium curves, kinetic behavior, and the determination of thermodynamic parameters. In particular, the findings illustrate that adsorption results were well correlated to the pseudo-second-order kinetic and Temkin isotherm models, in which the maximum adsorption capacities for IBP and KTP were measured to be about 86.03 and 38.68 mg/g, respectively. The adsorbent showed having an acceptable efficiency even after six cycles of regeneration, where adsorption capacity decreased <15 % compared to primary adsorbent. In addition, the fixed-bed column study was conducted, and the results revealed that the service volume reduced with the increase in the flow rate.