Synthetic Biochar Activated by Potassium and Zinc for Glyphosate Removal: Optimization with Design Experiment, Kinetics, and Isotherms Studies

Authors

  • Hussein A. Khalaf Chemistry Department, Faculty of Science, Damanhour University, Al-Buhayrah, Egypt.
  • Manar M. Ismail Plant Protection Department, Faculty of Agriculture, Omar AL- Mokhtar University. Libya.
  • Amal S. El-Towaty Chemistry Department, Faculty of Science, Ajdabya University, Ajdabya, Libya.
  • Salah M. Hussein Plant Protection Department, Faculty of Agriculture, Minia University., Minia, Egypt.

Keywords:

Adsorption, Glyphosate, Surface response, Experimental Design, Kinetics

Abstract

In this study, glyphosate removal from aqueous solution was compared using activated carbon prepared from rice husk and activated with KCl or ZnCl2. The Min Run Res IV design was used to select the main effect factors of adsorption, and the 3D response surface design was applied to evaluate the interactive effects of the three most important variables. Two adsorption isotherms (Langmuir and
Freundlich) and two models of kinetics (pseudo first and second order reaction) were used. The Min Run Res IV design considered five variables, including pH, temperature, time, dose of adsorbents, and type of metals. The three significant factors were further examined using 3D response surface plots, and the optimal conditions were found to be pH 5.8, dose 265 mg, and KAC more effective than ZnAC.
The results showed that the adsorption data fitted the Langmuir isotherm model better than the Freundlich model. The rate of glyphosate adsorption followed a pseudo-second-order model.

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Published

30.12.2022

Issue

Vol. 12 No. 4 (2022): OCTOBER-DECEMBER 2022

Section

Articles

License

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.