ORCID Profile
0000-0001-8615-1392
Current Organisation
Indonesian Institute of Sciences
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Publisher: Private Company Technology Center
Date: 25-06-2021
DOI: 10.15587/1729-4061.2021.229908
Abstract: Magnesium oxide (MgO) nanoparticles have been widely used in a variety of applications because of their good surface reactivity. Magnesium oxide from bittern has a larger surface area compared to magnesium oxide from calcined magnesite and magnesium ions precipitation from bittern using sodium hydroxide has higher purity than using calcium hydroxide or ammonium hydroxide. In this research, sodium hydroxide was added to a bittern solution obtaining magnesium hydroxide precipitate, followed by the calcination process to produce magnesium oxide. Nano magnesium oxide was synthesized by the ultrasonic destruction process using ethanol and 2-propanol as media. In this study, sonication time and particle concentration effect on the ultrasonic destruction process were investigated. During the process, the sonication time was varied between 8, 16, 32, 64, and 128 minutes while the magnesium oxide concentration was varied between 1 %, 2 %, and 3 %. Increasing sonication time and particle concentration will decrease the particle size. The previous study shows that particles with very small sizes tend to have an agglomeration effect. The aim of this work is to optimize nano magnesium oxide production from bittern. Surfactant addition was also studied to prevent agglomeration between particles. Four types of surfactant namely anionic (sodium lauryl sulfate), cationic (cetyl tri-methyl-ammonium bromide), hoteric (fatty acid amido alkyl betaine), and non-ionic (nonylphenol 10 ethoxylated) with a concentration of 1 % and a volume of 0.125 ml were added during the second ultrasonic destruction process. All types of surfactants have a positive effect to prevent agglomeration during the ultrasonic destruction process, with the hoteric surfactant having the highest performance
Publisher: IOP Publishing
Date: 06-2020
DOI: 10.1088/1757-899X/858/1/012045
Abstract: Magnesium in nature can be found in the form of minerals and seawater. Bittern is a sea-salt industry by-product that contains magnesium and potassium salts. Usually, bittern is discharged back to the sea, even though bittern can be further processed to obtain magnesium contained in it. Magnesium oxide (MgO) nanoparticles can be used in a variety of applications because of their good surface recreation properties. In this study, precipitation of Mg2 + ions from bitterns was carried out using sodium hydroxide to produce magnesium hydroxide. Then, it was calcined and went through sonochemical process to produce nano magnesium oxide. Sonication time and litude were used as variables. S le with sonication time of 16 minutes and litude of 30% has the smallest particles with an average diameter of 195.7 nanometers.
Publisher: IOP Publishing
Date: 07-2020
DOI: 10.1088/1742-6596/1569/4/042008
Abstract: Indonesia has a lot of dolomite reserves. Magnesium carbonate can be synthesized from dolomite. One of the main steps that requires a lot of energy are magnesium bicarbonate thermal decomposition. Magnesium bicarbonate solution are heated to make magnesium carbonate as precipitate. One of the ways to improve this process are by using ultrasonic waves as energy carrier. The purpose of this study is to find the effect of ultrasonic waves heating (sonochemistry) to thermal decomposition of magnesium bicarbonate. In this work, the author conducted ultrasonic heating with the litude of the waves varied around 20 µm and 30 µm for 35 minutes. Conventional heating using heat plate was also conducted and compared with ultrasonic heating. Higher decomposition ratio was reached on s les heated using ultrasonic waves with the value of 85.70% compared to conventional heating with decomposition ratio of only 50.08%. Amplitude effect on decomposition ratio were also observed. Higher litude made decomposition rate faster.
No related grants have been discovered for Fariza Yunita.