Nita Kusumawati, Toeti Koestiari, Maria Monica
Generally, this research aims to get a composite membrane that not only has the mechanical strenght, a good thermal and chemical resistance, but also economically. More specifically, the purpose of this research is to know the influence of the casting solution composition and stirring condition against mechanical strength and performance of PVDF-PSf composite membrane on textile industrial wastewater treatment. In addition, this research is also directed to determine the morphology of the surface of PVDF-PSf composite membrane. In this research, the PVDF-PSf composite membrane made by phase inversion method with immersion precipitation techniques in 100% H2O as non solvent. To know the influence of the casting solution composition to mechanical strength and the performance of the membrane, the membrane casting solution composition varied in the range PVDF/PSf/NMP/NH4Cl (%w/w) 12/2/84/2-16/0/0/84. Meanwhile, to find out the effect of stirring condition on mechanical strength and the performance of the membrane, the membrane making on this research was conducted with the variation of the stirring temperature in the range of 40-60°C. Measuring results of the PVDF-PSf composite membrane mechanical strength using autographs instruments shows that the PVDF-PSf composite membrane have mechanical strength in the range 0f 908,49 N/m2 - 2.118,09 N/m2. Flow rate (flux) measurement results of PVDF-PSf composite membrane using Dead end membrane reactor shows that the PVDF-PSf composite membrane have flux in the range of 1.200,38 L/m2.jam - 2.779,45 L/m2.jam. Meanwhile, the selectivity (rejection percentage) measurement results of PSf-PVDF composite membranes using Spectrophotometric UV-Visible instruments, mind that rejection coefficient of PVDF-PSf composite membrane is in the range of 89.88%-92.78%. While from the results of the surface morphology analysis of PVDF-PSf composite membrane using Scanning Electron Microscopy (SEM) instruments, note that casting solution affect the morphological structure of the membrane. The higher levels of the PSf that is added into the solution, porous membranes produced more rift. And vice versa. In addition, the analysis results of the PVDF-PSf composite membrane surface morphology using SEM showed that the stirring temperature effect on morphological structure of the membrane. The higher stirring temperature in the preparation of the PVDF-PSf composite membrane, the more tenuous porous structure resulting on the surface of the PVDF-PSf composite membrane. And vice versa.
Chemistry Department, Surabaya State University, Surabaya, Indonesia
