Preparation and optimization of the composition of novel nZVI/(Fe-Mn) binary oxide/bentonite adsorbent  for removal of reactive yellow 145 dye (RY-145) from aqueous solution

Pham Thi Thanh Huyen; Nguyen Binh Duong; Quan Thi Thu Trang; Pham Van Lam

doi:10.51316/jca.2020.048

Authors

Pham Thi Thanh Huyen Vietnam Academy of Science and Technology Author
Nguyen Binh Duong Vietnam Academy of Science and Technology Author
Quan Thi Thu Trang Vietnam Academy of Science and Technology Author
Pham Van Lam Graduate University of Sciences and Technology, Vietnam Academy of Science and Technology Author

DOI:

https://doi.org/10.51316/jca.2020.048

Keywords:

Removal, IFMB composite, reactive yellow 145 dye, adsorption, response surface methodology

Abstract

In this study, a new composite of nZVI/(Fe - Mn) binary oxide/bentonite (IFMB) was synthesized and used as an adsorbent for the removal of reactive yellow 145 dye (RY- 145) from aqueous solution. Optimization of composition of IFMB composite for removal of RY - 145 dye was conducted with the help of surface response method (SRM). Three independent variables affecting to the RY-145 adsorption efficiency were selected for optimization study: Fe/Mn ratio (mol/mol), Bentonite content (wt. %) and nZVI content (wt. %). The study reveals that optimal compositions of IFMB composite for RY-145 removal was Fe/Mn = 1,75; Bentonite 9,46 wt. % and nZVI 16,97 wt. %. In the adsorption condition: adsorbent dose of 1g.L^-1, initial dye concentration of 200 mg.L^-1, contact time of 120 min at 120 rpm and at 25 ^oC, the adsorption capacity for RY-145 dye on IMFB composite is 197 mg.g^-1. The value of RY-145 adsorption efficiency calculated by the model at the optimal point has been compared with the experimental value and the error is very small (0,36%). This proves that the RSM model has good repeatability.

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