School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; School of Water Resources and Environment, Hebei GEO University, Shijiazhuang 050031, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Sustained Development and Utilization of Water Resources, Shijiazhuang 050031, China.
School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China.
J Colloid Interface Sci. 2017 Oct 15;504:429-439. doi: 10.1016/j.jcis.2017.05.068. Epub 2017 May 23.
Graphene oxide (GO) and lithium chloride (LiCl) were introduced into poly (vinylidene fluoride) (PVDF) membranes prepared using the immersion precipitation technique. The hydrophilicity, water flux, X-ray diffraction (XRD), zeta potential, SEM and AFM images of membranes were investigated. By adjusting the content of GO from 0wt% to 0.9 wt%, the water flux of PVDF/GO/LiCl nanohybrid membranes varied from 48.4L/mh to 61.90L/mh at 100kPa. Because of the synergistic effects of GO and LiCl particles, the surface free energy (|ΔG|) of M3 (0.5wt% GO) membrane was highest (103.50mJ/m), indicating that the hydrophilicity of M3 membrane was highest. Rhodamine B aqueous solution was firstly used to determine the adsorption and desorption ability of membranes. After 20 cycles, the decolorization rates and flux recovery ratios of nanohybrid membranes exceeded 80% and 78.2% respectively, and the Rhodamine B rejection of M3 membrane was maximum (67.8%) at 100kPa, which illustrated that nanohybrid membranes can be reused as a better ultrafiltration and dye recovery material, and the characteristic of M3 membrane was best.
氧化石墨烯（GO）和氯化锂（LiCl）被引入到浸没沉淀技术制备的聚偏氟乙烯（PVDF）膜中。考察了膜的亲水性、水通量、X 射线衍射（XRD）、Zeta 电位、SEM 和 AFM 图像。通过调节 GO 的含量从 0wt%到 0.9wt%，在 100kPa 下，PVDF/GO/LiCl 纳米杂化膜的水通量从 48.4L/mh 变化到 61.90L/mh。由于 GO 和 LiCl 颗粒的协同作用，M3（0.5wt%GO）膜的表面自由能（|ΔG|）最高（103.50mJ/m），表明 M3 膜的亲水性最高。首先使用罗丹明 B 水溶液来测定膜的吸附和解吸能力。经过 20 次循环，纳米杂化膜的脱色率和通量恢复率分别超过 80%和 78.2%，在 100kPa 下，M3 膜对罗丹明 B 的截留率最高（67.8%），这表明纳米杂化膜可以作为一种更好的超滤和染料回收材料重复使用，并且 M3 膜的特性最好。
