In situ nano-Fe3O4/triisopropanolamine functionalized graphene oxide composites to enhance Pb2+ ions removal

In this work, a kind of magnetic graphene oxide composite material (TI/GO@Fe 3 O 4 ) for Pb 2+ removal was successfully synthesized through in situ growth method. Briefly, metal ions (Fe 3+ ) were fixed on GO surface by oxygen-containing functional groups and acted as growth centers of Fe 3 O 4 . Furthermore, the surface of GO and Fe 3 O 4 nanoparticles were strengthened by the triisopropanolamine and its oxidation products (TI), which can promote the removal of Pb 2+ ions. The mass percentage of Fe 3 O 4 particles in TI/GO@Fe 3 O 4 was 54.31% by EDS datas. Average particle size of TI/GO@Fe 3 O 4 is 19.03 nm. The adsorption experiments indicated that the adsorption capacity of TI/GO@Fe 3 O 4 can reach 461.00 mg/g under optimized conditions (10 mg TI/GO@Fe 3 O 4 , 50 mL 500 mg/L Pb 2+ , pH 5.0, 293 K, 120 min). The XPS analysis results indicated that the TI/GO@Fe 3 O 4 can adsorb the Pb 2+ through the complexation between nitrogen and oxygen-containing functional groups and Pb 2+ ions. Hence, the composite material is a superior material for the adsorption of Pb 2+ . Moreover, the synthesized adsorbent can be recycled by magnet quickly after adsorption.