A new Modified Heterocyclic-Magnetite Chitosan Nanocomposite for Efficient Alizarin Red Dye Removal: Adsorption Analysis and Antibacterial Activity

Abstract

Alizarin Red (AR) is one of the most colored hazardous industrial dyes. For effective removal of AR, a new sorbent of modified heterocyclic-magnetite chitosan nanocomposite labeled as AOC@MC was synthesized and characterized by FTIR, TGA, XRD, BET, TEM,SAED pattern and SEM-EDX. Effect of contact time, pH, adsorbent dosage, initial Alizarine Red concentration and temperature was investigated. The maximum AR removal was 98.9% and attained at optimum conditions which were pH = 3.0, contact time = 50 min., and adsorbent dosage = 0.03 g/L. The findings revealed that at pH 3 and 30 °C, the maximum adsorption capacity was approximately 162 mg/g. Within 50 min, equilibrium adsorption was attained. A pseudo-second-order equation might be used to fit the kinetic data that was acquired at the optimal pH level of 3. Langmuir adsorption isotherms could accurately represent the adsorption process. The antimicrobial properties of the functionalized sorbent AOC@MC and its heterocyclic base AOC were characterized by determining the zone of inhibition (ZOI) against Staphylococcus aureus and Klebsiella pneumonia as a model for Gram-positive and Gram-negative bacteria respectively. AOC@MC exhibits promising activity with clear zones of 20.1 ± 0.2 and 17.6 ± 0.4 mm for S. aureus and K. pneumonia respectively. Overall, the modified sorbent AOC@MC was efficient on AR dye removal and antibacterial activity compared to the corresponding heterocyclic compound AOC.