Adsorption of phenols from olive oil waste waters on layered double hydroxide, hydroxyaluminium-iron-co-precipitate and hydroxyaluminium-iron-montmorillonite complex

作者：De Martino Antonio^*; Iorio Marianna; Prenzler Paul D; Ryan Danielle; Obied Hassan K; Arienzo Michele

来源：Applied Clay Science, 2013, 80-81: 154-161.

DOI：10.1016/j.clay.2013.01.014

• Olive mill wastewater,phenols
• Adsorption
• Layered double hydroxides
• Phytoassay

Olive mill waste water (OMWW) contains high concentrations of phenols that are responsible for the high toxicity of the effluent. A one step precipitation process of OMWW by cold methanol yielded a polymeric organic precipitate (polymerin) and a supematant (OMWW-S) rich in phenols, which were further concentrated in an ethyl acetate extract (OMWW-E). This extract was comparatively adsorbed on: i) a layered double hydroxide of magnesium and aluminium (LDH); ii) the LDH after calcination at 450 degrees C (LDH-450); iii) a hydroxyaluminium-iron-co-precipitate (HyAlFe); and iv) a hydroxy-aluminium-iron-montmorillonite complex (HyAlFe-Mt). Adsorption behaviour and kinetics of phenols with these materials were investigated. The Langmuir model better described adsorption (R-2 %26gt; 0.97) in comparison to the Freundlich model (R-2 %26gt; 0.89). Phenols were sorbed according to the following order: LDH-450 %26gt; LDH %26gt; HyAlFe %26gt; HyAlFe-Mt. Phenol adsorption on LDH matrices was strong, since desorption with simulated soil solution under dynamic conditions never exceeded 20%. Cyclic adsorption conducted with LDH-450 removed most phenols, -94% from OMVVW-E, consequently reducing its phytotoxicity. The study evidenced that calcined LDH represented an effective remediation process for OMWW.

• 出版日期2013-8