Phenol adsorption on magnetic biochar derived from olive pomace: Equilibrium, kinetic and thermodynamics

Göktepeli, Gamze; Yildiz, Sevil; Yel, Esra

doi:10.15671/hjbc.687387

Cited by 6 publications

(1 citation statement)

References 30 publications

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“…The Freundlich isotherm model was the best-fit isotherm for adsorption for all investigated compounds, ranging the values of the determination coefficient between 0.8538 and 0.9994. Those findings concur with Abid et al [64] and Göktepeli et al [65]. The highest R 2 value was obtained by vanillic acid-4-glucoside, and the highest K f value was achieved by oleuropein.…”

Section: Discussionsupporting

confidence: 91%

Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues

Prelac,

Major,

Cvitan

et al. 2023

Antioxidants

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Given today’s increasingly intensive agriculture, one key problem area considers the valorization and reuse of wastes from food and agricultural production with minimal impact on the environment. Due to its physicochemical characteristics, biochar (BC) derived from grapevine pruning residue has shown considerable potential for use as an adsorbent. High-value phytochemicals found in abundance in the olive leaf (OL) can be employed in many different industrial sectors. The potential application of BC in the removal of specific polyphenolic components from OL extracts has been investigated in the present study. Water, as the most available and greenest of solvents, was investigated as to its use in the extraction of polyphenols, which was carried out by comparing maceration, ultrasound-assisted extraction, and microwave-assisted extraction, considering different temperatures and solid-to-liquid (s/l) ratios. The BC adsorption capacity of selected polyphenols was fitted with both the Langmuir and Freundlich isotherm models. The Freundlich model fitted better relative to OL polyphenols adsorption. Oleuropein was the most abundant compound identified in the extracts, obtaining the highest Kf value (20.4 (mg/g) × (L/g)n) and R2 coefficient (0.9715) in the adsorption on the biochar’s surface. The optimum conditions in the dosage experiment suggest the use of 0.5 g of BC using 3 g/L extracts, with an exception for oleuropein and hydroxytyrosol, for which the highest biochar dose (2.5 g) performed better. Considering the compounds’ concentrations and the BC dose, BC from grapevine pruning residues demonstrated a potential use in the uptake of specific polyphenols from olive leaves, making it a promising adsorbent for such applications.

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Section: Discussionsupporting

confidence: 91%