Sintesis Hidrogel Komposit Menggunakan Lignin H2SO4 Di-Isolasi dari Kulit Ari Kopi sebagai Adsorben Methylene Blue

Abstract

The synthesis of hydrogel composite based on kulit ari kopi has been carried out by crosslinking method. The method applied by the addition of lignin H2SO4 isolated from kulit ari kopi was 0.05%, 0.1%, 0.2%, 0.3%, the addition of 2 g of CNF and the addition of 5% PVA for each variation. From the prepared composite hydrogel samples, physical and chemical properties were tested using several measurement techniques for several characterizations. Characterizations applied include characterization of water absorption, methylene blue absorption, characterization of functional groups, characterization of microcrystalline properties, morphological characterization and characterization of mass reduction on thermal treatment. From the results of the characterization, the results are interrelated and mutually supportive. The best sample belongs to the hydrogel sample HYD-005 which has a water absorption capacity of 55% and an effective absorbance of methylene blue which is 81% in every hour applied. The measurement of the absorbance of methylene blue is also applied to variations in temperature, namely 350 °C, 450 °C, 550 °C. From the applied temperature variation, the absorbance values obtained were 59%, 53% and 81%, respectively. Of all the samples synthesized, the HYD-005 sample has the best value from other samples, this is supported by each data of characterization and analysis obtained.