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/GFs)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 CuI to Cu2O by cycle voltammetry from-1.0 to 0.5 V for 90 cycles in pH 9.0,0.1 mol·L^-1 KNO3.Thus,CuxO/MPM/GFs was renewable in the continuous electrochemical-adsorption-desorption processes.

Cu/n-TiO_2/PBO复合纤维的制备

以PBO纤维为基体,采用浸渍涂覆法在PBO纤维表面包覆纳米TiO2膜,采用化学镀法将Cu沉积到纳米TiO2膜表面,制备了Cu/n-TiO2/PBO复合纤维,研究了影响纳米TiO2沉积速率和Cu沉积速率的主要因素。结果表明,纳米TiO2与偶联剂的浓度配比是影响纳米TiO2包膜形成的主要因素,当纳米TiO2与偶联剂浓度配比为1∶1.2时,制备的n-TiO2/PBO复合纤维界面结合力较好,且纳米TiO2包覆层比较均匀。影响化学镀铜的主要因素有镀液成分、反应时间和反应温度。在镀液成分的浓度配比为CuSO4.5H2O 12 g.L-1、KNaC4H4O68 g.L-1、HCHO 6 mL.L-1和NaOH 10 g.L-1,反应温度50℃,镀铜时间20 min的条件下,制备了负载均匀,界面结合力较好的Cu/n-TiO2/PBO复合纤维。

亲水性PVDF-编织管中空纤维复合膜萃取水中Cu^(2+)的研究

采用自制亲水性PVDF-编织管中空纤维复合膜,构建了膜萃取器实验装置,以二-(2-乙基己基)-磷酸(D2EHPA)为有机萃取剂,煤油为稀释剂萃取水中Cu2+,考察不同聚乙烯醇(PVA)含量的复合膜对于水中Cu2+萃取率的影响。结果表明,随温度升高,萃取率不断加大,但在37℃之后,温度对于萃取率影响甚小。而水溶液p H和有机相流量的适当改变,可以显著提高膜的萃取率。随着铸膜液中亲水剂PVA含量的增加,孔隙率不断增大,复合膜表面微孔数量逐渐增多,孔间连通度增大。当PVA的质量分数为4%时,膜表面孔分布均匀、孔隙率最大,且对水中Cu2+的萃取率达到最佳。