Abstract
The aim of the study is the determination of adsorption mechanism of two proteins characterized by different internal stability (ovalbumin – OVA, lysozyme – LSZ) on the surface of horsetail herb-based engineered biochar (AC) as well as aggregation degree of the selected solid in the presence of biopolymer in the wide pH range (3–11). The engineered biochar was characterized based on the results of nitrogen adsorption/desorption isotherm method, Boehm titration and elemental compound analysis. The adsorption/aggregation mechanisms were determined using spectrophotometric adsorbed amount measurements, zeta potential, potentiometric titration, turbidity measurements and CPS analyses. Mesoporous horsetail herb-based engineered biochar shows the highest adsorption capacity related to OVA and LSZ at protein isoelectric point (i.e. pH 5 for OVA, pH 11 for LSZ). The OVA and LSZ adsorbed amounts is 395.4 and 493.7 mg/g, respectively. Under the same conditions, the OVA and LSZ presence stimulates the AC particle aggregation. As a result, at selected pH values large protein amounts can easily be removed from the aqueous solution using eco-friendly carbonaceous adsorbent.
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