Synthesis and Characterization of a Reusable Layered Tin Titanium Phosphate for Removing Cu(Ii)

In current work, a layered tin phosphate doped with Ti, SnXTi1-XP (HPO4)2·H2O (x = 0.88, 0.72, 0.4, 0.11, 0.03, referred to as SnXTi1-XP), has been successfully synthesized by conventional hydrothermal method. Moreover, to evaluate the adsorption effect of adsorbent, crucial factors such as x value, adsorbent dosage, adsorption time, initial concentration of metal ions, temperature, pH, ion strength in solution on the adsorption efficiency of Cu(II) are also investigated. The results have been shown that the removal effect of Cu(II) can reach 81.3% at the appropriate process conditions, and the Langmuir isotherm can fit the adsorption behavior of Sn0.72Ti0.28P on Cu(II), and the theoretical maximum adsorption capacity is 2.96 mg·g-1. And the adsorption of Cu(II) by Sn0.72Ti0.28P is in accordance with the pseudo-second-order kinetic model compatibly. At last, in the desorption experiment, the adsorbed Sn0.72Ti0.28P is acid leaching in 3 mol·L-1 nitric acid solution for 24 h, and the desorption efficiency can reach 96.4%