Optimization of chitosan/tannic acid@ ZnFe layered double hydroxide bionanocomposite film for removal of reactive blue 4 using a response surface methodology.

Layered double hydroxides (LDH) are great adsorbents for anionic pollutants, but are in a powder form that leads to challenges in solid-liquid separation, low hydraulic conductivity, and handling. Herein, novel bionanocomposite films containing chitosan (Cs), tannic acid (TA), and LDH were fabricated and applied for the removal of reactive blue 4 (RB4). A response surface methodology with Box–Behnken design was applied to study the effect of operating parameters (TA%: 0–20, LDH%: 0–20, pH: 5–9, adsorbent dosage: 0.5–1.5 g L−1, time: 30–90 min) on RB4 dye removal (DR%). A quadratic regression equation was successfully developed to predict the response (R2: 0.95). The obtained optimized condition was TA%: 10, LDH%: 20, pH: 5, adsorbent dosage: 1.5 g L−1, and time: 71 min that resulted in DR%: 98.2. The best-fitted adsorption isotherm and kinetic models were linear Langmuir and nonlinear pseudo-second-order models, respectively. The maximum capacity of adsorption for the optimized film was 406 mg g−1. The obtained thermodynamic parameters implied that the process of adsorption was exothermic and spontaneous. The reusability studies showed that the DR% was decreased from 93% for the first cycle to 69%, 57%, and 56% for the second, third and fourth cycle, respectively. [Display omitted] • Chitosan/tannic acid@ ZnFe layered double hydroxide film was synthesized. • The Cs/TA@LDH film was applied for color removal of reactive blue 4 dye. • A Box–Behnken design was used to optimize film composition and adsorption conditions. • The optimal percentages of TA and LDH in Cs/TA@LDH were 10% and 20%, respectively. • The maximum adsorption capacity of the fabricated adsorbent was 406 mg g−1. [ABSTRACT FROM AUTHOR]