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THE DEVELOPMENT OF SCIENCE PROCESS SKILLSBASED ASSESSMENT ON MATERIAL FACTORS INFLUENCE THE RATE OFREACTION prasdiantika, ricka; kadaritna, nina; fadiawati, noor
Jurnal Pendidikan dan Pembelajaran Kimia Vol 1, No 2 (2012): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Program Studi Pendidikan Kimia FKIP Unila

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Abstract

This study aims to develop scienceprocess skills (SPS) based assessmenton material influence ofthe rate of reaction.The research methodused is theResearchand Development (R&D).The results of this assessment, the development of the 15 multiple choice questions on the grounds, and 8 essay questions that measure indicators of cognitive products, and indicator SPS students who presented using macroscopic representation, submicroscopic representation, and symbolic.Results from the limited  testing it is known that SPSbased assessmentis in accordancewith thecurriculum of the SK-KD is the  percentage of 95.20%, is in accordance with the indicator SPS is the percentage 98.18%, has a very highlevel oflegibilityto the percentage of 86.56%, and has a very highlevel of interesting with thepercentage of88.33%. Based on theresponsesof teachers, SPS based assessmentis feasible for students tested.Keywords: assessment, reaction rate, scienceprocess skills
PREPARASI DAN PENENTUAN JENIS OKSIDA BESI PADA MATERIAL MAGNETIK PASIR BESI LANSILOWO Prasdiantika, Ricka; Susanto, Susanto
Jurnal Teknosains Vol 6, No 1 (2016): December
Publisher : Universitas Gadjah Mada

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Abstract

This study aims to preparation, identify the content, and determine the type of iron oxide on the magnetic material from Iron Sand Lansilowo. Magnetic material is separated from iron sand using an external magnet. Magnetic material washes by using aquadest and dried at 80 °C. Materials were characterized by X-Ray fluorescence (XRF), Fourier Transform Infrared (FT-IR) spectrophotometer, X-ray diffractometer (XRD) and Transmission electron microscope (TEM). The results show that the magnetic material of iron sand Lansilowo contains elements of Fe (46.13%), the element Cr (28.08%), Mg (10,11%), Si (8.20%) and other minor elements. Iron oxide contained in iron sand Lansilowo is dominated by magnetite iron oxide (Fe3O4). The results of characterization show that the magnetic material of iron sand still contain oxide impurities such as silica oxide and chromium oxide
PENGARUH PELARUT TERHADAP DISPERSI PARTIKEL Fe 3O4@SITRAT. Susanto, Susanto; Prasdiantika, Ricka; Bolle, Theodor C.M.
Jurnal Sains Materi Indonesia Vol 17, No 4: JULI 2016
Publisher : BATAN

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Abstract

PENGARUH PELARUT TERHADAP DISPERSI PARTIKEL Fe 3O4@SITRAT. Magnetit (Fe3O4) memiliki sifat yang khas dan memiliki banyak aplikasi dalam berbagai bidang. Dispersi partikel berperan penting dalam menentukan sifat magnetit. Tujuan penelitian ini adalah untuk mengetahui pengaruh jenis pelarut (aseton-air dan aseton-etanol) terhadap dispersi partikel Fe3O4@sitrat.Sintesis Fe3O4 dilakukan menggunakan natrium sitrat sebagai agent pendispersi magnetit melalui pengadukan dengan gelombang ultrasonik pada sistem co-presipitasi, kemudian dilakukan pencucian dengan variasi pelarut. Produk hasil sintesis dikarakterisasi dengan Fourier Transform Infrared Spectrophotometer (FT-IR), X-Ray Diffraction (XRD), dan Transmission Electron Microscope (TEM). Hasil menunjukkan bahwa Fe3O4 yang terdispersi oleh natrium sitrat dengan pencucian aseton-air menghasilkan dispersi partikel yang lebih baik dan memiliki agregat yang lebih kecil dibandingkan pencucian aseton-etanol.
SINTESIS NANOMATERIAL MAGNETIT-SITRAT DAN PENGUJIAN APLIKASINYA SEBAGAI ADSORBEN EMAS (III) Susanto, Susanto; Prasdiantika, Ricka; Bolle, Theodor C.M.
Jurnal Teknosains Vol 6, No 2 (2017): June
Publisher : Universitas Gadjah Mada

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Abstract

This study aims to synthesize of  magnetite nanomaterial was dispersed with trisodium citrate (Fe3O4@citrate), carry out the characterization, and testing of  its application in adsorbing of Au(III). Research carried out by synthesis of Fe3O4 with stirring using ultrasonic waves to synthesis of magnetite in the system of co-precipitation, using sodium citrate as dispersing agent of magnetite, and using acetone-water as solvent at washing of magnetite. Synthesized product was characterized by Fourier Transform Infrared spectrophotometer (FTIR), X-ray diffractometer (XRD), and transmission electron microscope (TEM). The characterized results indicate that Fe3O4@citrate has successfully synthesized with particle size of 17 nm. Fe3O4@citrate has smaller particle size, has smaller aggregates and has better particle dispersion than Fe3O4 without citrate. Testing the potential of synthesized Fe3O4@citrate as adsorbent of Au(III) from HAuCl4 solution of 200 ppm at pH 3. The Synthesized Fe3O4@citrate adsorbed the gold(III) of (81.554 ± 1.403) mg/g.
PENGARUH RUTE SINTESIS TERHADAP KEEFEKTIFAN PENGIKATAN GUGUS PDETA PADA SINTESIS Fe3O4@SiO2@PDETA Susanto, Susanto; Prasdiantika, Ricka
Jurnal Teknosains Vol 8, No 1 (2018): December
Publisher : Universitas Gadjah Mada

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Abstract

Synthesis of Fe3O4@SiO2 modified with propyldiethylenetriamine (Fe3O4@SiO2@PDETA) with variation of synthesis routes have been investigated. Research was begun with synthesis of Fe3O4 using dispersion agent of trisodium citrate at coprecipitation system through stirring using ultrasonic wave. Coating magnetite with propyldiethylenetriamine modified silica was carried out through sol-gel process with two different mixing sequences of raw materials (two synthesis routes) with main materials of Fe3O4 synthesized, N-[3-(Trimethoxysilyl)propyl]-diethylenetriamine (TMSPDETA) and Na2SiO3. The products were characterized by fourier transform infrared (FTIR) spectrophotometer and scanning electron microscope-energy dispersive X-ray (SEM-EDX). Results indicate that Fe3O4@SiO2@PDETA has been synthesized succesfully. Fe3O4@SiO2@PDETA synthesized through route 1 (magnetite mixed with a mixture TMSPDETA and Na2SiO3) contains more propyldiethylenetriamine group than that of through route 2 (magnetite mixed with Na2SiO3 solution, then mixed with TMSPDETA)