Comparation of Calix[6]arene and its Phosphorus Derivative for Complexation of Na+, Cu2+, Ni2+, Pb2+, Fe3+, Cr3+ and 2+ UO22+ Ions

The calix [6] arene and 5,11,17,23,29,35-butyl-25,26,27,28,29,30-diethyl phosphates calix [6] arene (EtPO6) were synthesized and their complexation with different metal ions were investigated. The calix [6] arene and EtPO6 were characterized by IR spectrum. The complexation between the host (calix [6] arene and EtPO6) and the guest (metal ions) were investigated by UV-VIS spectrum and extraction experiments. The results show that the complexation of metal ions by calix [6] aren ranked as Na⁺ > Cu²⁺ > Pb²⁺ > UO₂²⁺ > Fe³⁺ > Cr³⁺ > Ni²⁺, and the complexation of metal ions by EtPO6 ranked as UO₂²⁺ > Cu²⁺ > Fe³⁺ > Pb²⁺ > Na⁺ > Cr³⁺ > Ni²⁺. Compared with calix [6] aren, the extraction capacity of UO₂²⁺, Cu²⁺, Fe³⁺, Pb²⁺, Cr³⁺ and Ni²⁺ ions by EtPO6 increased by 37.6%, 10.2%, 10.6%, 9.6%, 2.2%, 4.4%, respectively, while that of Na⁺ ion decreased by 22.3%.