Novel catalyst from two-phase olive mill wastes using hydrothermal carbonisation for the removal of methylene blue by heterogeneous Fenton-like oxidation

• Published in: International journal of environmental analytical chemistry Vol. 100; no. 8; pp. 854 - 872
• Main Authors: Izghri, Zaina, Enaime, Ghizlane, Louarrat, Mehdi, El Gaini, Layla, Baçaoui, Abdelaziz, Yaacoubi, Abdelrani
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 20.06.2020; Taylor & Francis LLC
• Subjects: advance oxidation processes; Carbonization; catalyst; Catalysts; Ferric chloride; Food waste; Hydrochar; hydrothermal carbonisation; Iron chlorides; Leaching; Mass; MB removal; Methylene blue; Oxidation; Removal; Residence time; Response surface methodology; Temperature; Wastes; Yield
• ISSN: 0306-7319; 1029-0397
• DOI: 10.1080/03067319.2019.1643461

In this study, hydrochars were prepared by hydrothermal carbonisation of two phases olive mill wastes (TPOMW) impregnated with FeCl 3 . The produced hydrochars have been used as catalysts in advance oxidation processes for the removal of methylene blue (MB). The effect of residence time, carbonisation temperature and FeCl 3 ratio on hydrochar mass yield and MB removal have been studied and optimised using the response surface methodology. The increase in carbonisation temperature increases the MB removal and induces a reduction in the mass yield. HTC of TPOMW at 250°C during 4 h and with the ratio of FeCl 3 to TPOMW of 1.5 allowed for the production of hydrochar with high mass yield (66%) that was effectively used as a catalyst in heterogeneous Fenton-Like oxidation achieving an MB removal of about 91%. The optimal catalyst can be reused for successive cycles as the catalyst material is stable and have very less iron leaching property.