Synthesis and characterization of a novel TiO 2 @chitosan/alginate nanocomposite sponge for highly efficient removal of As(V) ions from aqueous solutions: Adsorption isotherm, kinetics, experiment and adsorption mechanism optimization using Box-Behnken design

• Published in: International journal of biological macromolecules Vol. 275; no. Pt 1; p. 133513
• Main Authors: Ghubayra, Reem, Mousa, Ibtisam, Madkhali, Marwah M M, Alaghaz, Abdel-Nasser M A, Elsayed, Nadia H, El-Bindary, Ashraf A
• Format: Journal Article
• Language: English
• Published: Netherlands 01.08.2024
• Subjects: Adsorption; Alginates - chemistry; Arsenic - chemistry; Arsenic - isolation & purification; Chitosan - chemistry; Hydrogen-Ion Concentration; Ions - chemistry; Kinetics; Nanocomposites - chemistry; Temperature; Titanium - chemistry; Water - chemistry; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water Purification - methods; Kinetics; Box-Behnken design; TiO@CSC.Alg composite sponge; Adsorption isotherm
• ISSN: 1879-0003
• DOI: 10.1016/j.ijbiomac.2024.133513

This research uses a novel TiO @CSC.Alg composite sponge was created by encasing TiO nanoparticles in the natural polymers alginate and chitosan, resulting in a nanocomposite that is both ecologically friendly and biocompatible. Using the generated nanocomposite as a new environmentally friendly adsorbent, As(V) heavy metal ions were effectively removed from aqueous media. The following techniques were used to analyse the physicochemical properties of the obtained materials: pH , FTIR, XRD, BET, SEM, and XPS. Utilizing nitrogen adsorption/desorption isotherms, the TiO @CSC.Alg composite sponge's textural properties were identified. This revealed a BET surface area of 168.42 m /g and a total pore volume of 1.18 cc/g, indicating its porous nature and potential for high adsorption capacity. Examine the effects of temperature, pH, dose, and beginning concentration on adsorption. The adsorption characteristics were determined based on equilibrium and adsorption kinetics measurements. The adsorption process was both pseudo-second-order (PSOE) and Langmuir isothermally fit. Chemisorption was the adsorption method since the adsorption energy was 25.45 kJ·mol . An endothermic and spontaneous adsorption process was indicated by more metal being absorbed as the temperature increased. The optimal conditions for adsorption were optimized via Box-Behnken design software to be pH of 5 in the solution, a dosage of 0.02 g of the TiO @CSC.Alg composite sponge per 25 mL, and an arsenate (As(V)) solution the adsorption capacity was 202.27 mg/g are ideal for efficient adsorption. These parameters are critical in achieving the maximum adsorption capacity of the composite sponge for arsenate, which could be beneficial for water purification applications. Utilizing Design-Expert software's response surface methodology (RSM) and Box-Behnken design (BBD), the adsorption process was optimized with the fewest planned tests. After six successive cycles of adsorption and desorption, the adsorbent stability was confirmed by the adsorbent reusability test without any noticeable decrease in removal efficacy. Additionally, it displayed good efficiency, the same XRD and XPS data before and after reuse, and no change in chemical composition.