Chinese Journal of Chemical Engineering, Vol.28, No.4, 1046-1054, 2020
Potential-aided recovery of iodide using 2-D nanosheet CUxO coating polymer/graphene/carbon fibers composite
2-D nanosheet Cu2O doped CuO coating poly m-phenylenediamine and melamine/graphene/carbon fibers composite (CuxO/MPM/Grs) was firstly fabricated by compound electrochemical method. CuxO/MPM/GFs was successfully used to the recovery of iodide (I-) from salt water by lower potential-aided sorption and desorption processes. The potential-aided recovery of I at CuxO/MPM/GFs was characterized by FE-SEM, XRD, IR, Raman, XPS, UV-vis and electrochemical techniques in detail. The maximal adsorption capacity of 86.82 mg.g(-1) could be obtained with a pseudo-second-order model at 0.8 V for 210 min in pH 5.0, 0.1 mol.L-1 NaCl, and the process accompanied the generation of CuI, CuO and I5-. The I- could be quickly desorbed from the electrode with a transfer of Cut to Cu2O by cycle voltammetry from - 1.0 to 0.5 V for 90 cycles in pH 220.127.116.11 mol.L-1 KNO3. Thus, CuxO/MPM/GFs was renewable in the continuous electrochemical-adsorption-desorption processes. (C) 2019 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.