Adsorption plasticizer by nanosphere adsorbent of persimmon tannin binding bovine serum protein

In this study, nanosphere (NS) of a persimmon tannin binding bovine serum protein (BSA-PT-NS) adsorbent were prepared. The BSA-PT-NS exhibited good adsorption capacity for the plasticizer diethyl phthalate (DEP), with an adsorption rate of 74.5 %. The BSA-PT-NSs were spherical and their surfaces appeared to be uneven. The FT-IR and XPS results indicated that the adsorption of DEP was mainly due to the phenol hydroxyl group on PT, and the CO and -NH- functional groups of BSA also contributed. The addition of Na⁺, Ca²⁺, and Mg²⁺ significantly decreased the adsorption rate (P < 0.05). The maximum DEP adsorption capacity of BSA-BT-NS was calculated to be 487.8 mg/g based on the Langmuir linear model. The adsorption kinetics results showed that the pseudo-first-order model fitted well. The DEP removal rate remained above 68 % after five cycles, demonstrating that the BSA-PT-NSs had excellent regeneration properties for DEP adsorption.