SINTESIS DAN KARAKTERISASI KOMPOSIT Fe3O4 TEREMBANKAN KARBON AKTIF TEMPURUNG KELAPA

Luqman Hakim, NIM. 16630018 (2020) SINTESIS DAN KARAKTERISASI KOMPOSIT Fe3O4 TEREMBANKAN KARBON AKTIF TEMPURUNG KELAPA. Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.

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Abstract

Synthesis and characterization of Fe3O4 composites embedded on coconut shell activated carbon has been carried out in order to make magnetic adsorbents. The presence of Fe3O4 which embedded on coconut shell activated carbon is expected to provide magnetic properties to the composite, so that the adsorbent can be separated using an external magnetic field after the adsorption process. The carbon that used is the result of pyrolysis coconut shell at a temperature of 650 °C for 4 hours. The carbon produced is then mashed and chemically activated using a 50% (w/v) KOH solution for 24 hours. After that the carbon is activated physically by heating at 500 °C for 1 hour. Synthesis of Fe3O4 composite was carried out by the coprecipitation reflux method at 70 °C for 3 hours. This method is done by mixing the iron salt solution Fe3+/Fe2+ (mol ratio 2: 1) with activated carbon suspension in water followed by the addition of 2,5 M NaOH solution. The structure, functional groups, morphology and surface area of composites were characterized using FTIR, XRD, SEM and GSA. Composite magnetic properties are tested by responses to magnetic field. The characterization results showed the embedment of Fe3O4 on the coconut shell activated carbon structure was successfully carried out through the interaction of hydroxyl groups at wave numbers 563.21 and 416.62 cm-1. The peaks at 2θ 30.12° [220], 35.58° [311], 43.14° [400], 53.57° [422], 57.18° [511] and 62.83° [440] shows the existence of a magnetite phase sized of 11.72 nanometers. Activated carbon has a micropore character with an average pore size of 1.46 nm. The presence of magnetite reduces the surface area of activated carbon from 91.16 m2/g to 12.04 m2/g. The response of the sample towards the magnetic field indicates that the composite has magnetic properties.

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