Re-evaluation of Thermodynamic Parameters using Dimensionless Langmuir Constants from Published Data on Glyphosate Adsorption onto Activated Carbon Loaded with Manganese and Iron

Authors

  • Hartinie Marbawi Biotechnology Programme, Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah
  • Ahmad Razi Othman Department of Chemical Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, D.E, Malaysia.
  • Mohd Izuan Effendi Halmi Department of Soil Management, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, D.E, Malaysia.
  • Jualang Azlan Gansau Biotechnology Programme, Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah
  • Khalizan Sabullah Biotechnology Programme, Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah
  • Nur Adeela Yasid Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, D.E, Malaysia.

DOI:

https://doi.org/10.54987/jebat.v3i2.544

Keywords:

Activated Carbon; Adsorption; Glyphosate; Langmuir; Thermodynamic

Abstract

Effect of temperature on the adsorption process will be reflected in the thermodynamic parameters. These data provide information on the efficiency of the adsorption process. Thus, an appropriate calculation for the thermodynamic parameter is crucial in adsorption research. In this paper, thermodynamic parameter data from a previously published paper on glyphosate adsorption onto AC/Mn/Fe was re-evaluated using the newly proposed method based on dimensionless equilibrium constant (Kc) derived from Langmuir sorption method. The recalculated results are as follows; entropy, ΔS°=224.04 J mol-1, enthalpy, ΔH° =39.97 kJ mol-1 and the range of Gibs fee energy for the five investigated temperature (5 â°C, 15 â°C, 25 â°C, 35 â°C and 45 â°C) were ΔG°278.15K = -22.26 kJ mol-1 and ΔG°318.15K = -32.52 kJ mol-1. Recalculated value of thermodynamics presented in this paper is mostly beyond the original data. Significant differences were observed in the sign and magnitude of ΔS° and the value of ΔG° of the tested temperature. Interestingly, the actual experiment was well represented by the recalculated results. Here we suggested the alternative calculation for thermodynamic parameters using the dimensionless equilibrium constant Kc.

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Published

2020-12-31

How to Cite

Marbawi, H., Othman, A. R., Halmi, M. I. E., Gansau, J. A., Sabullah, K., & Yasid, N. A. (2020). Re-evaluation of Thermodynamic Parameters using Dimensionless Langmuir Constants from Published Data on Glyphosate Adsorption onto Activated Carbon Loaded with Manganese and Iron. Journal of Environmental Bioremediation and Toxicology, 3(2), 6–10. https://doi.org/10.54987/jebat.v3i2.544

Issue

Vol. 3 No. 2 (2020)

Section

Articles

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