Abstract
This study aimed to determine the adsorbent characteristics of coffee grounds activated charcoal (Coffea Sp.), optimum adsorption contact time, and differences in the quality of siwalan liquid sugar through adsorption and without adsorption. The characteristics of coffee grounds activated charcoal were determined by FTIR and SAA. FTIR characterization showed that activated coffee grounds charcoal contained functional groups of O-H, Csp2-H, Csp3-H, C-H2 methylene, C-O, and C=C-H. Characterization with SAA showed that the surface area of activated charcoal was 27.70 m2/g with a pore volume of 0.02 ml/g and an adsorption pore size of 1.63 nm. The optimum contact time of the adsorbent in the adsorption of impurities in the palm sap was 60 minutes. The siwalan liquid sugar, which went through adsorption, had a reducing sugar content of 6.70%, and the one without adsorption was 10.18%. While the ash content of siwalan liquid sugar through adsorption was 4.73%, and without adsorption was 6.5%. This value indicates that the quality of siwalan liquid sugar through adsorption is higher than that which does not go through the adsorption stage. Keywords: adsorption, activated charcoal, siwalan liquid sugar
Highlights
The absorption at a wavelength of 1465.90 cm-1 was due to C-H2 methylene groups
On the basis of the study's findings, it can be concluded that: 1. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that the charcoal after activation contained functional groups O-H, Csp2-H, Csp3-H, C-H2 methylene, C-O, C=C-H
Analysis of activated charcoal with Surface Area Analyzer (SAA) showed that the surface area obtained was 27.70 m2/g with a pore volume of 0.02 mL/g, and the adsorption pore size formed was 1.63 nm. 2
Summary
Sugar is a source of carbohydrates in the human body and is added to food or beverages. Indonesia's national sugar consumption continues to increase every year. This increase is due to the high projected growth of the food and beverages industry and changes in the quality of life, which is equivalent to the increase in population. The most widely traded sugar is solid sucrose crystals, used to sweeten foods or beverages. Apart from being a sweetener, brown sugar contains mineral salts and is rich in nutrients beneficial for the body. One type of palm sugar that is widely used is siwalan sugar (Sahroel, 2009). Siwalan sap is usually clear, slightly cloudy, and contains between 10-15% sugar.
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