SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 40 ›› Issue (12): 287-292.DOI: 10.1016/j.cjche.2020.12.020

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Adsorption-desorption of phenolic compounds from olive mills wastewater using Tunisian natural clay

Islem Chaari1, Atef Touil2, Mounir Medhioub2   

  1. 1. Useful Materials Valorization Laboratory, National Center for Research in Materials Sciences, Soliman 8027, Tunisia;
    2. Department of Geology, Faculty of Science, Sfax, Tunisia
  • Received:2020-04-24 Revised:2020-11-29 Online:2022-01-14 Published:2021-12-28
  • Contact: Islem Chaari,E-mail:chaari_islem@yahoo.fr

Adsorption-desorption of phenolic compounds from olive mills wastewater using Tunisian natural clay

Islem Chaari1, Atef Touil2, Mounir Medhioub2   

  1. 1. Useful Materials Valorization Laboratory, National Center for Research in Materials Sciences, Soliman 8027, Tunisia;
    2. Department of Geology, Faculty of Science, Sfax, Tunisia
  • 通讯作者: Islem Chaari,E-mail:chaari_islem@yahoo.fr

Abstract: Olive mills wastewater (OMW) exhibit substantial contaminated properties due to their content of phenolic constituents and organic substances. The purpose of this work was the investigation of the efficiency of clay materials for the adsorption of phenolic compounds, which are contained in OMW. Furthermore, thermal activation of the clay took place in order to improve phenolic compounds uptake and afterwards, desorption process was studied. The adsorbent was characterized using XRD, XRF and BET surface area analyses. The adsorption efficiency of phenolic compounds by raw and calcined clay at 600 ℃ was 77.61% and 84.21%, respectively at acidic pH. The values of Gibbs free energy indicated that adsorption process is spontaneous and beneficial at higher temperatures. Alkaline medium was propitious for phenolic compounds desorption. The obtained results showed that natural clay could be used as a low-cost adsorbent for OMW treatment.

Key words: Clayey material, Adsorption, Phenolic compounds, Olive mills wastewaters, Desorption

摘要: Olive mills wastewater (OMW) exhibit substantial contaminated properties due to their content of phenolic constituents and organic substances. The purpose of this work was the investigation of the efficiency of clay materials for the adsorption of phenolic compounds, which are contained in OMW. Furthermore, thermal activation of the clay took place in order to improve phenolic compounds uptake and afterwards, desorption process was studied. The adsorbent was characterized using XRD, XRF and BET surface area analyses. The adsorption efficiency of phenolic compounds by raw and calcined clay at 600 ℃ was 77.61% and 84.21%, respectively at acidic pH. The values of Gibbs free energy indicated that adsorption process is spontaneous and beneficial at higher temperatures. Alkaline medium was propitious for phenolic compounds desorption. The obtained results showed that natural clay could be used as a low-cost adsorbent for OMW treatment.

关键词: Clayey material, Adsorption, Phenolic compounds, Olive mills wastewaters, Desorption