Abstract Scope |
A novel tremella-like 3D carbon nanosheet functionalized by hydroxyl groups with the thickness about 10 nm had been synthesized via a direct carbonization process using sodium citrate as a carbon source without any additional template. This process was featured by simple processing, short time consuming and high adsorption capacity for Ga(III), which could achieve to 102.39 mg g-1 at pH 3. The adsorption mechanism was deduced as the ion exchange of Ga(OH)2+, Ga(OH)2+, or Ga3+ with H+ of the C-O-H and Ti-O-H. At pH 3, SelGa/Ge, SelGa/Zn, SelGa/Al and SelGa/Cu were 1.26, 2.08, 1.17 and 1.42, indicating that Ga(III) can well separate from coexisting ions containing other similar competitive metal ions such as Ge(IV), Zn(II), Al(III) and Cu(II). Moreover, the hydroxyl groups functionalized 3D carbon nanosheet which is a low-cost and environment-friendly has good reusability and stability. |