Add time:07/23/2019         Source:sciencedirect.com

In this work, Box–Behnken design (BBD) in response surface methodology (RSM) was applied to optimize the synthesis condition of crosslinked chitosan-tripolyphosphate/TiO2 nanocompsite (CCTPP/TiO2 NC) as well as the adsorption conditions of reactive orange (cas 109603-48-7) dye (RO16) from aqueous solution. The key input factors in this optimization process were loading of TiO2 nanoparticles into CCTPP polymeric matrix (A: 0%–50%), adsorbent dose (B: 0.04–0.14 g/50 mL), solution pH (C: 4–10), and temperature (D: 30–50 °C). The analysis of variance (ANOVA) was performed to evaluate the adequacy of the model, and significant factors were successfully indicated (p < 0.05). The experimental results indicate that the highest RO16 removal efficiency of 92.7% was observed by significant interaction effects between AB (p-value = 0.02) and AC (p-value < 0.0001). The optimum TiO2 loading, adsorbent dosage, solution pH, and temperature were (50% TiO2: 50% chitosan labeled as CCTPP/TiO2 NC-50), 0.09 g/50 mL, 4.0, and 40 °C. The adsorption of RO16 from aqueous solution by using CCTPP/TiO2 NC-50 in batch mode was evaluated. The adsorption kinetic results were well described by the pseudo-second order kinetic. The adsorption isotherm followed Freundlich model. The adsorption capacity of CCTPP/TiO2 NC-50 for RO16 was 618.7 mg/g. The adsorption mechanism included electrostatic attractions, n-π stacking interactions, dipole–dipole hydrogen bonding interactions, and Yoshida H-bonding.

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