Chitosan-Schiff base nano silica hybrid system for azo acid dye removal: Multivariable optimization, desirability function, and adsorption mechanism

• Published in: INORGANIC CHEMISTRY COMMUNICATIONS
• Main Authors: Wu, Ruihong; Abdulhameed, Ahmed Saud; Alothman, Zeid A.; Yong, Soon Kong; Wilson, Lee D.; Jawad, Ali H.; Algburi, Sameer
• Format: Article
• Language: English
• Published: ELSEVIER 2024
• Subjects: Chemistry
• Online Access: https://www-webofscience-com.uitm.idm.oclc.org/wos/woscc/full-record/WOS:001218981500001
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2024.112237

The facile synthesis of cross -linked chitosan-glutaraldehyde/nano silica (CHS-GLA/n-Silica) nanocomposite was accomplished in two steps including the functionalization of a natural biopolymer (CHS) with an inorganic nanomaterial (n -Silica), followed by a cross -linking process with glutaraldehyde (GLA). The ability of CHS-GLA/ n -Silica to remove acid red 88 (AR88) dye from an aqueous system was optimized by the Box-Behnken design (BBD), taking into consideration the factors affecting adsorption (CHS-GLA/n-Silica dose (0.02-0.1 g/100 mL); time (10-60 min); and pH (4-10). The equilibrium behavior of AR88 by CHS-GLA/n-Silica is clearly illustrated by the Langmuir and Temkin isotherms. The kinetics of AR88 adsorption by CHS-GLA/n-Silica were appropriately described by a pseudo -second -order model. CHS-GLA/n-Silica displays an adsorption capacity of 115.9 mg/ g. The electrostatic forces between the positively charged CHS-GLA/n-Silica and the AR88 anions, as along with n-pi, and H -bond interactions, which accounts for the efficient adsorption of AR88 onto the CHS-GLA/n-Silica. This study demonstrates that CHS-GLA/n-Silica has promising potential as an adsorbent for the effective removal of synthetic dyes from wastewater.