Higher uranium(VI) biosorption capacity and repeated use of PA-ZZF51 prepared by marine mangrove endophytic fungus ZZF51 and phytic acid

The grafted mangrove endophytic fungus Fusarium sp. #ZZF51 by phytic acid with polyphosphate groups (PA-ZZF51) was successfully synthesized by esterification reaction, and its uranium(VI) biosorption conditions, models, mechanism and regeneration property were also obtainted. The uranium(VI) removal from aqueous solution by PA-ZZF51 was optimized at pH (5.0), S/L ratio (0.2 g L −1 ), time (45 min), and the initial uranyl ions concentration (100 mg L −1 ) with 453.70 mg g −1 of biosorption capacity and 90.74% of removal percentage, respectively. Kinetic and equilibrium biosorption studies showed pseudo-second-order equation and Langmuir isotherm model could better fit with the experiment data. FTIR and SEM of the prepared material indicated the various functionalities on the mycelium surface including hydroxyl, carboxyl, phosphate groups and so on were responsible for the binding of uranyl ions.