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

Huyen Pham Thi Thanh, Duong Nguyen Binh, Trang Quan Thi Thu, Bich Phan Thi Ngoc, Lam Pham Van

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.

Keywords


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

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References


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

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