Sintesis Zeolit 4A dari Abu Limbah Sawit dengan Variasi Suhu Pembentukan Gel dan Variasi Volume Natrium Silikat dengan Natrium Aluminat

Zeolite 4A is one of the synthetic zeolite which it is used as ion exchange. This zeolite can be synthesized from silica and alumina. In this research, the palm ash is used as source of silica. The purpose of this research is produce the zeolite 4A by using palm ash and getting the best condition of synthesis zeolite 4A. Synthesis of zeolite 4A made by mixing sodium silicate and sodium aluminate with variation of volume at 55:45 and 60:40 mL:mL and variety of gelling temperatures are 60, 70, and 80oC with rate of agitation at 200 rpm. Then the gel formed will be heated in the oven at 80oC for 8 hours and washed it until it\u27s pH neutral. After that, dried it at 120oC for 3 hours. The synthesis product is analyzed by using spectrophotometry fourier transform infra red (FTIR) and X ray diffraction (XRD). The best conditions of cristalization toproduce the zeolite 4A by using palm ash are temperature at 60oC and variation of volume at 55:45 mL:mL

Pembuatan Scaffold Trikalsium Fosfat Berpori Menggunakan Metode Protein Foaming-Consolidation dengan Variasi Waktu dan Temperatur Pengeringan

Tricalcium phosphate (TCP) is a ceramics material which is widely used for bone subtitude. Protein foaming-consolidation method is a technique for production of porous tricalciumphosphate (TCP) using egg yolk as pore creating agent. The purpose of this research was to investigate the effect of time and drying temperature effect on physical, chemical and mechanical properties of porous TCP and characterizing porous TCP as bones implant. This research start by mixing TCP powder, sago powder, Darvan 821A and egg yolk. The slurries were mechanical stirred at 150 rpm for 3 hours. Then, the slurries were casted in a cylindrical stainless stell moldand heated at 160oC, 180°C and 200oC for 5, 10, 15, 20, 30, 40, 50 and 60 minutes. Subsequently, dried samples were demolded and burned at 600°C for 1 hour.,For the final steps,samples were sintered at 1150oC for 1 hour. The results of porous TCP from this research was 45.90-61.70% for porosity, the density was 1.20-1.72 g/cm3 and the compressive strength was 8.04-8.64 Mpa