FILTRASI ION LOGAM Cr6+ DENGAN MEMBRAN KOMPOSIT KITOSAN SILIKA (FILTRATION METAL ION Cr6+ WITH COMPOSITE CHITOSAN SILICA MEMBRANE)

  • ERMA NORALIA Jurusan Kimia FMIPA Unesa

Abstract

Abstrak. Telah dibuat membran komposit kitosan silika untuk menurunkan kadar ion logam Cr6+. Membran komposit
kitosan silika dibuat dengan konsentrasi silika 0,025M. Karakterisasi membran komposit kitosan silika meliputi uji
tarik mulur membran menggunakan autograph dan gugus fungsional dari membran yang diketahui dengan FTIR..
Data sifat mekanik membrankomposit kitosan silika menunjukkan bahwa nilai modulus young yaitu 86,80 N/mm2.
Karakterisasi membran komposit kitosan silika menggunakan FTIR menunjukkan bahwa munculnya gugus fungsional
OH, NH2, C-H, C-O, C-N, Si-OH, dan Si-O-Si. Uji kinerja membran komposit kitosan silika dilakukan dengan proses
filtrasi. Koefisien rejeksi membran komposit kitosan silika tertinggi untuk filtrasi Cr6+ yaitu 45,30% dengan konsentrasi
awal Cr6+ 20 ppm. Dari data FTIR membran komposit kitosan silika sebelum dan sesudah filtrasi ion logam Cr6+
terdapat pergeseran bilangan gelombang pada gugus fungsional yg menunjukkan gugus fungsional yang berperan
dalam proses filtrasi, yaitu NH2, OH, dan Si-O-Si.
Kata Kunci: membran kitosan silika, ion logam Cr6+, filtrasi, koefisien rejeksi.
Abstract. Composite chitosan silica membrane can be used to lower the levels of metal ions Cr6+. Composite chitosan
silica membrane made with concentration of silica 0.025M. Composite chitosan silica embrane mechanical properties
shows that the highest value was presented on the young's modulus addition of silica at concentrations of 0.02M with a
value of young's modulus 86.800 N/mm2. Characterization of composite chitosan silica membrane include functional
groups of the membrane analysis with FTIR. Characterization of composite chitosan silica membrane using FTIR
showed that there was the functional group OH, NH2, CH, CO, CN, Si-OH, and Si-O-Si. From the filtration process it
was obtained that rejection coefficient of the composite chitosan silica membranes for filtration metal ion Cr6+ was
45.300% with the early concentration solution of the metal ion Cr6+ 20 ppm. The FTIR of composite chitosan silica
membrane after filtration show that there were shift in the number of waves on a functional group which shows the
functional groups that functioning in the process of filtration, NH2, OH, and Si-O-Si.
Keywords: chitosan silica membrane, metal ion Cr6+, filtration, rejection coefficient.
Published
2013-01-31
Section
Articles
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