Hidrolisis Selulosa Dari Sekam Padi (Oryza Sativa) Menjadi Glukosa Dengan Katalis Arang Tersulfonasi

Cellulose hydrolysis from rice husk (Oryza sativa) into glucose with sulfonated charcoal catalyst was conducted. The aim of this research was to determine sulfuric acid concentration and contact time on the sulfonation process of charcoal which would produce the highest glucose rendement from cellulose hydrolysis of rice husk. Sulfuric acid concentrations in this experiment were 8, 10, and 12 N with variation of contact time of 4, 6, 8, 10 and 12 hours respectively. Rice husk was delignified with NaOH 10% to produce cellulose which was hydrolyzed by sulfonated charcoal catalyst. Hydrolysis reaction with the ratio cellulose/aquadest 1:25 (w/v) was conducted in autoclave with temperature 130 oC for 3 hours. The result showed that 8 N concentration of sulfuric acid and 12 hours of contact time produced the highest glucose rendement 17,9%

Aplikasi Selulosa Bakterial-dietilentriamina Sebagai Lapisan Pengikat Logam Pb Dan Cd Pada Metode Diffusive Gradient in Thin Films (Dgt)

This research aimed to synthesis and apply of bacterial cellulose-diethylenetriamine as a binding layer on the diffusive gradients in thin films method for preconcentration of labile metal Pb and Cd in aquatic systems and sediment of Palu Bay. The results are expected to be used for the analysis of environmental contaminants aquatic pollutant/sediment replace conventional methods. DGT method easily carried into the field and sensitive to identify certain metal ions. The results showed concentration of heavy metals dissolved in seawater for Pb between 0.024 to 0.048 mg / L, while for Cd between 0.006 to 0.015 mg / L. The concentration of Pb in sediments from 7.426 to 16.043 mg / L and Cd 0.387 to 0.950 mg / L. Partial regression analysis between Pb and Cd concentrations in water with a concentration of cadmium metals Pb and Cd in the sediments showed that the concentration of heavy metals in water has a positive correlation with the concentration of Pb and Cd in the sediment