Facile Synthesis of an Organic–Inorganic Nanohybrid Composite of Salicylaldehyde-Based Chitosan Schiff Base/SiO2 for Acid Red 88 Dye Removal: Characterization and Adsorption Modeling

• Published in: Journal of Inorganic and Organometallic Polymers and Materials
• Main Author: Wu R.; Abdulhameed A.S.; Yong S.K.; ALOthman Z.A.; Wilson L.D.; Jawad A.H.
• Format: Article
• Language: English
• Published: Springer 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176097272&doi=10.1007%2fs10904-023-02876-6&partnerID=40&md5=c01dbda96a5175d6a00519a481a577c2

The current study employed the hydrothermal approach to graft chitosan functionalized-SiO2 nanoparticles with an aromatic aldehyde (salicylaldehyde, SA) to obtain an organic–inorganic nanohybrid composite of salicylaldehyde-based chitosan Schiff base/SiO2 (CTS-SA/SiO2) for uptake of an acidic azo dye (acid red 88, AR88) from aqueous media. The effects of A: CTS-SA/SiO2 dose (0.02–0.1 g), B: pH (4–10), and C: time (10–90 min) on the adsorption performance of CTS-SA/SiO2 towards AR88 were studied systematically by the Box–Behnken Design (BBD). The CTS-SA/SiO2 dosage, pH, and contact time resulted in maximum dye elimination (76.46%) of AR88, according to the results of the BBD model. These variables were 0.093 g of CTS-SA/SiO2, pH 4.5, and 87.4 min. The pseudo-second order and Langmuir isotherm provide an account of the experimental results for AR88 adsorption by CTS-SA/SiO2. The calculated maximum Langmuir adsorption capacity for CTS-SA/SiO2 is equal to 184.2 mg/g. The high adsorption of AR88 onto the CTS-SA/SiO2 can be mainly ascribed to electrostatic forces between the protonated CTS-SA/SiO2 and the AR88 anions, along with n–π, π–π, and H-bond interactions. This research demonstrates that CTS-SA/SiO2 has promising potential as an adsorbent for organic dye removal from water systems. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.