Abstract
Synthesis, sorption–desorption studies and physicochemical analysis of novel hydroxyapatite modified biochars were performed. The hydroxyapatite used for the modification originated from the four sources: egg shells, boiler stone, chalk and marl. The obtained sorbents were used for vanadium ions removal from the aqueous solutions. It is dangerous impurity and its extensive use as a steel additive requires continual removal. The optimized sorption conditions: pH 3, time 240 min, temperature 293 K allowed to obtain satisfactory results, in particular for BC-HAp1 (hydroxyapatite modified biochar from egg shells) for which qt is equal to 27.45 mg/g (concentration 100 mg/L). The calculated ΔH°, ΔS° and ΔG° reveal the nature of the sorption process. Washing the sorbents with hydrochloric acid after the sorption resulted in nearly 80% desorption efficiency. The physicochemical analysis of the sorbents allowed to suggest a complex, mixed mechanism of sorption involving physical and chemical interactions.
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