Similar to several literature studies, adsorption capacity displayed a decreasing trend, possibly related to the agglomeration of GO/HAp particles leading to less available active adsorption sites for 5-FU molecules [ [100] , [101] , [102] ]. 3.11.2 Drug release kinetics of GO-NH 2 /HAp composite The drug release profiles GO-NH 2 /HAp composite in comparison with GO/HAp with changing pH were presented in Fig. 12 .
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5-Fluorouracil adsorption on graphene oxide-amine modified graphene oxide/hydroxyapatite composite for drug delivery applications: Optimization and release kinetics studies.
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