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 dye. For effective removal of AR, a new sorbent of modified heterocyclic- magnetite chitosan nanocomposite (AOC@MC) was synthesized and characterized by FTIR, TGA, 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 and its heterocyclic base are 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. The modified chitosan sorbent (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. Whereas, the synthesized heterocyclic compounds didn’t show antibacterial activity toward tested strains. Overall, the modified compound was efficient on AR dye removal and antibacterial activity compared to unmodified and heterocyclic compounds.