| Summary: | 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-π, 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. © 2024 Elsevier B.V.
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