Thermodynamics and Kinetics Studies of Methylene Blue Adsorption Onto Yemeni Palm-Date Stones

Authors

  • AbdulRahman Yousef Wahoud Chemistry department, College of Science, Hadhramout University .Received on 22/1/2019 and Accepted for Publication on14/1/2020
  • Sawsan Awadh Almaqdi Chemistry department, College of Science, Hadhramout University .Received on 22/1/2019 and Accepted for Publication on14/1/2020

Keywords:

Date stones, Methylene blue, Adsorption, Isotherms, Kinetics

Abstract

A raw and baked date stones were used for the removal of methylene blue (MB) from aqueous solutions. The
maximum adsorption capacity was 111 mg/g for raw and 41 mg/g for baked date stones with 10 mmol/l initial
concentration of MB, 5 pH and 0.5 g/l adsorbent dose. The adsorption isotherm was found to follow the Langmuir
model. Two simplified kinetic models including pseudo-first-order and pseudo-second-order equation were selected
to follow the adsorption processes. Kinetic studies showed that the adsorption followed pseudo-second order model.
Various thermodynamic parameters such as Δ????, Δ???? and Δ???? were evaluated. The results in this study indicated that
the raw Yemeni palm-date stones could be employed as an effective adsorbent for the removal of MB from aqueous
solutions.

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Published

2023-11-26

Issue

Vol. 16 No. 2 (2019): Volume 16, Issue 2, Dec 2019

Section

Articles