ANALISA SERAPAN LOGAM BERAT Fe PADA KARBON AKTIF YANG DICAMPURKAN DENGAN NANO Fe3O4 DAN POLYVINYLIDENE FLUORIDE (PVDF)

Abstract

The study on heavy metal absorption of active carbon added by Polyvinylidene Fluoride (PVDF) and Fe3O4 has been performed. The active carbon was applied in order to absorp heavy metal of Fe. The mixture of Fe3O4 and carbon powder provision started from the process of pre-carbonization at a temperature of 280oC in a vacuum. The process of ball milling and seaving resulted small carbon particles of 38 μm in diameter. The increase in surface area of the carbon has been achieved by chemical activation using the KOH activator with weight ratio of KOH and carbon powder of 4:1. The carbon powder that had been activated was then mixed to at ratio of 5:3. The mixing process was done by using a mortar and continued to ball miling process for 2 hours. The sample was carbonized at temperature of 850oC in N2 gas and then proceed to washing and drying proceses in order to produce uniform mixture of Fe3O4 and carbon powder. After that, the PVDF 5% was added to the sample. Absorption testing of heavy metal of Fe in Siak river water samples was performed by immersing it to the sample in 2 hours. Atomic absorption spectroscopy test results revealed that absorption percentage respectively of 34.71% without Fe3O4, 41.65% of the sample and 94.51% of the sample with PVDF. Characterization of x-ray diffraction showed the peak of Fe at 2θ = 44.55o of the carbon powder and 2θ = 44.76o of the sample with PVDF. Scanning electron microscopy with 150X magnification showed particle size with its length of 22.5 μm with by 30.14 μm of the carbon powder and a length of 51.1 μm with by 58.6 μm of the sample with PVDF . The figure of 1000X showed a whitish powder due to metal Fe that spreaded evenly on the surface of the samples. Energy diversive x-ray proved the present of metal Fe in carbon absorbent material with percentage of 0.24% of the carbon powder and 60.78% of the sample with PVD