Effects of PVDF-HFP concentration on membrane distillation performance and structural morphology of hollow fiber membranes
作者： M.C. García-Payo , M. Essalhi , M. Khayet
DOI: 10.1016/J.MEMSCI.2009.10.026
关键词:
摘要: Poly(vinylidene fluoride-hexafluoropropylene), PVDF-HFP, hollow fiber membranes were prepared by the dry/wet spinning technique using different copolymer concentrations in dope solutions ranging from 17 to 24 wt.%. All parameters maintained constant except concentration. The morphological properties of studied terms scanning electron microscopy (SEM), atomic force (AFM) and void volume fraction. effects PVDF-HFP content also measuring water entry pressure direct contact membrane distillation (DCMD) permeate flux membranes. An increase concentration solution resulted a decrease precipitation rate transition cross-section structure finger-type sponge-type structure. Pore size, nodule size roughness both internal external surfaces determined AFM. It was observed that pore decreased with increasing reached minimum value at outer surface for greater than 20 Water values whereas fraction DCMD increased decreasing
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