Enhancement of adsorption capacity of low cost mesoporous MCM-41 and their antibacterial and antifungal activities

This work aims to the enhancement of low cost MCM-41 adsorption capacity of copper and iron ions separately and as a mixture from solution and subsequently their use in antibacterial and antifungal activities. MCM-41 mesoporous were synthesized from used spent glass as source of silicon and aluminum. The hybrid MCM-41 mesoporous were obtained by impregnation of 8-hydroxyquinoline 5-sulfonic acid on the MCM-41 pores under different mass ratios (5, 10, 15, 20 and 25%). The hybrid solids were characterized by x-ray diffraction (XRD), and the presence of 8-hydroxyquinoline 5-sulfonic acid in hybrid MCM-41 is verified by thermogravimetric analysis and infrared spectroscopy. The effect of contact time, initial pH of a solution, heavy metal concentrations and 8-hydroxyquinoline 5-sulfonic acid content on the adsorption efficiency were investigated. Pseudo-first/second order isotherms are applied to determine the efficiency of hybrid solid. The experimental data fitted well with the pseudo-second order model for Cu2+ and Fe2+ adsorption. Maximum yields for Cu2+ and Fe2+ were 94% and 95% respectively. However, the extraction yield for both ion metals seems to be increase to reach 98.24% and 95.10% for iron and copper respectively when both solutions are mixed together. The hybrid MCM-41 with higher extraction yield for both metal ions and for mixture are applied as antibacterial inhibitors against Gram-negative (E. coli ATCC 25922, P. aeruginosa ATCC 27853,), Gram-positive (S. aureus1 ATCC 25923, S. aureus2 ATCC 43300) bacteria and also as antifungal against Candida albicans ATCC 10231. The obtained results of the application of hybrid MCM-sox Cu, Fe and Cu/Fe as antibacterial and antifungal inhibitors seem to be very promising material in the adsorption and antimicrobial fields.