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Zeolitic imidazolate frameworks (ZIFs) of various morphologies against eriochrome black-T (EBT): optimizing the key physicochemical features by process modeling



Various Zeolitic Imidazolate Frameworks (ZIFs), a unique class of metal organic frameworks (MOFs), were prepared and studied for the removal efficiency against the hazardous azo dye eriochrome black-T (EBT) from water. Two type of ZIF were synthesized, Co-based (ZIF-67) and Zn-based. For each type, four variations with different morphologies were chosen in order to determine the best performing candidate for the further optimization studies. ZIF-67-OAc showed a superior adsorptive EBT removal efficiency compared to the rest herein studied ZIFs. To statistically model the EBT removal, response surface methodology (RSM) using Box-Behnken design (BBD) technique was followed. According to the model, solution/​suspension pH was found to play the most significant role that govern the rate of EBT adsorption. Under optimized condition, where pH, ZIF-67-OAc dose, mixing time, and EBT concentration set to be 6.82, 832.4 mg/​L, 39.95 min, and 100 mg/​L, respectively, a 99% EBT removal was achieved. The equilibrium data best fitted to Freundlich isotherm model, indicating that the dye molecules accumulate in multilayer on the ZIF-67-OAc surface. Based on the Langmuir isotherm model that was also fitted well (R2=0.95), the qmax was found 263.5 mg/​g. Furthermore, EBT adsorption onto ZIF-67-OAc was descripted better with the pseudo-first order kinetic model.

G.A. Haghighat, S. Sadeghi, M. Hossien Saghi, S.K. Ghadiri, I. Anastopoulos, D.A. Giannakoudakis, J.C. Colmenares, and M. Shams. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 606 (2020) 125391.


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