Metilen mavisi boyasının aljinat-biyocam membranlara adsorpsiyonu: Cevap yüzey yöntemi, izoterm ve kinetik çalışmalar

Abstract

In this research, environment-friendly composite membranes based on alginate (ALG) and bioglass nanoparticles (BGs) were prepared by the solvent casting technique and utilized as adsorbents for the elimination of methylene blue (MB) from water. Zeta potential of the particles was determined to be -24.9 mV by laser dynamic light scattering (DLS), and their sizes were found to be 773 and 777 nm by transmission electron microscopy (TEM) and DLS analysis, respectively. Atomic force microscope (AFM) analysis revealed that increasing the BGs content from 1 to 5% w/v caused the root mean square roughness of membranes to increase from 159.38 to 182.03 nm. The adsorption process was successfully modeled and optimized using a hybrid response surface methodology integrated central composite design (RSM-CCD). A statistical analysis was utilized to examine and optimize the effects of three important independent variables (concentration of BGs (1-5% w/v), pH of the solution (3-9), and initial dye level (15-45 mg L-1)) on MB adsorption performance. The findings indicated that the quadratic model was suitable for prediction of MB's removal. Optimized experimental parameters were found to be a pH of 9, a contact time of 120 min, an initial MB concentration of 45 mg L-1, and a BGs concentration of 1% (w/v). Freundlich isotherm and pseudo-second-order kinetic models were found to be the best-fitting models in isotherm and kinetic studies, respectively. Dubinin-Radushkevich (D-R) isotherm model predicted a chemical mechanism for MB adsorption onto the composite alginate membranes.