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Sintesis Arang Aktif Sabut Pinang (Areca Catechu L.) Teraktivasi H3po4 Sebagai Adsorben Zat Warna Methyl Orange
Areca nut (Areca catechu L.) contained areca nut fiber waste that can be utilized as an alternative source of adsorbent, because it contains high cellulose. This research aims to determine the adsorbent dose and optimum pH for Methyl Orange dye adsorption. The adsorption method used in the research was Batch adsorption of Methyl Orange dye with adsorbent dose variation (0.8; 1; 1.2 and 1.4 g) and pH variation (2, 3, 4 and 5). Areca nut fiber was carbonized at 400°C for 30 minutes, obtained a yielding of 38.73% and activated using H3PO4 10% to remove impurities and open the pores in the carbon. Areca nut fiber carbon before and after H3PO4 activation was characterized based on SNI standard
No. 06-3730-1995 which included a water content of 3.33%, ash content of 4.50%, and an absorption capacity for Methylene Blue of 15.65 mg/g with a surface area of 58.01 m2/g. Morphological analysis and elemental composition analyzed using SEM-EDX showed the resulting in the adsorbent surface dominated by Carbon (C) and Oxygen (O), the pore size of the adsorbent analyzed using ImageJ software and the results obtained were carbonized before activation 1.11 µm and after activation 1.73 µm. Functional group analysis was analyzed using FTIR with the results of areca nut fiber activated carbon containing N-H,
-OH, C-H, C=O, C=C and C-O groups. The adsorption results of Methyl Orange were analyzed using UV-Vis Spectrophotometer, obtained an optimum adsorbent dose of 1.2 g and an optimum pH of 2 with an efficiency of 65.31% and adsorption capacity of 0.56 mg/g and at pHPZC 4.6. Based on the research, it can be concluded that areca nut fiber activated carbon was not effective in adsorbing dyes because the Methylene Blue absorption capacity did not meet the
SNI standards.
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