KOMPOSIT HIDROKSI LAPIS GANDA Ca-Al/BIOCHAR SEBAGAI ADSORBEN ZAT WARNA METILEN BIRU

ASRI, FIKO and Lesbani, Aldes and Rachmat, Addy (2020) KOMPOSIT HIDROKSI LAPIS GANDA Ca-Al/BIOCHAR SEBAGAI ADSORBEN ZAT WARNA METILEN BIRU. Undergraduate thesis, Sriwijaya University.

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Abstract

Ca-Al layered double hydroxides synthesis and Ca-Al layered double hydroxides/biochar composite have been performed by coprecipitation method and characterized by XRD, FT-IR, BET, TG-DTA and SEM-EDX analyzes. Preparation composite of Ca-Al layered double hydroxides with biochar in this study aims to increase the surface area of the material so that it can increase its effectiveness as an adsorbent for methylene blue dyes. XRD analysis showed Ca-Al/biochar composite still have diffraction peaks which indicate the presence of Ca-Al layer double hydroxide and biochar materials. FT-IR analysis on Ca-Al layer double hydroxide produces vibrations that indicate the presence of O-H, N = O, and Ca-O and Al-O groups and in biochar produces vibrations that indicate the presence of OH, C = O, and Si-O-Si, where in the composite material all functional groups are contained in the Ca-Al double layer hydroxy and biochar. BET analysis shows the surface area of the double layer hydroxy is 29.33m2/g and biochar have a surface area of 50,936 m2/g and composites have a surface area of 38,692 m2/g; 40,748 m2/g and 158,291 m2/g. TG-DTA analysis showed that Ca-Al layer double hydroxide material, biochar and Ca-Al/biochar double layer hydroxy composite can be decomposed. SEM-EDX analysis showed that the most component in Ca-Al layer double hydroxide material and composite was oxygen, while in biochar the most component was carbon. Data on the pH variation in Ca-Al bilayer hydroxy material, biochar and Ca-Al/biochar bilayer hydroxy composite showed maximum adsorption occurs at pH 5. The kinetics of adsorption on layer double hydroxide material, biochar and Ca-Al/biochar double layer hydroxy composite show that the pseudo second order kinetics model is more suitable for adsorption of methylene blue dyes. The adsorption isotherm equation in the double layer hydroxy material and biochar is more suitable using the freundlich isotherm model while the Ca-Al/biochar layer double hydroxide composite material is more effective using the Langmuir adsorption isotherm model. The most effective solvent for desorption of methylene blue dyes in double-layer hydroxy adsorbents is HCl while in biochar and composites 1: 0.1 is ethanol, while in composite materials 1:0.5; 1:1, 1:3 and 1:5 are more suitable to use acetone solvents. Regeneration carried out showed that composite materials have better regeneration ability than the constituent materials.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Adsorption, biochar, Ca-Al layered double hydroxides, composite, methylene blue
Subjects:	Q Science > QD Chemistry > QD146-197 Inorganic chemistry
Divisions:	08-Faculty of Mathematics and Natural Science > 47201-Chemistry (S1)
Depositing User:	Users 7395 not found.
Date Deposited:	16 Sep 2020 02:41
Last Modified:	16 Sep 2020 02:41
URI:	http://repository.unsri.ac.id/id/eprint/35070

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