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PEMBUATAN KOMPOS DARI LIMBAH PADAT (SLUDGE) PABRIK PULP DAN PAPER Sembiring, Maria Peratenta; Irianty, Rozanna Sri
Jurnal Riset Kimia Vol 5, No 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.213

One of the method to use pulp and paper mill sludge was convert it become a compost. This research result showed that time variation of compost have different physical and organic matter properties. In physical properties, 3 months of compost had 12.57% moisture content, while organic matter contain 10.56% carbon, 1.07% nitrogen, and 9.87 C/N ratio. For 4 months compost had 6.79% moisture content, 11.88% carbon, 0.91% nitrogen, and 13.05 C/N ratio. Nutrients content from both composts appropriate with the standard value of National Standarisation Body.

PENGARUH KONSENTRASI INHIBITOR EKSTRAK DAUN GAMBIR DENGAN PELARUT ETANOL-AIR TERHADAP LAJU KOROSI BESI PADA AIR LAUT Irianty, Rozanna Sri; Sembiring, Maria Peratenta
Jurnal Riset Kimia Vol 5, No 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.218

The important properties to overcome the corrosion are safe, available, biodegradable, low cost, and environmental friendly. Gambier leaves extract is one of the inhibitor that have environmental friendly properties. This study aims to determine the effectiveness of extract using ethanol-water to reduce the corrosion rate. Soaking of ferrous iron plate samples in seawater media have done for corrosion test. Agitator and aerator motors at turn-on and conducted a series of immersion with varying contact time 5, 10, 15, and 20 days. After the time up next ferrous iron plate samples were cleaned, dried, and weighed. Experiment was repeated by adding a inhibitor heavy leaves gambier extract with varying leaves gambier extract, 1000, 3000, and 5000 ppm. Soaking iron plate samples performed at varying pH at 3(acid), 6 (netral), and 9 (alkaline). Calculation is then performed and the rate of corrosion inhibition efficiency gambier leaves extract with ethanol-water solvent. On the immersion of iron plate without inhibitor, the result that the longer the contact time, the weight of the iron plate was reduced. The results showed the addition of inhibitors of leaves extract gambier with ethanol-water solvent into the corrosive media can reduce the rate of corrosion. Inhibitor of leaves extract gambier using ethanol-water solvent effective to reduce the rate of corrosion inhibitor at a concentration of 5000 ppm and contact time of 20 days with the lowest value of the corrosion rate is 0.000503 g/cm2 days in seawater media at initial pH 7.9. Gambier extracts gave greatest inhibition efficiency about 60.345% obtained at a concentration of 5000 ppm inhibitor and 20 days contact time.

Modifikasi Kulit Telur Puyuh Dan Fly Ash Menjadi Katalis Cao/Fly Ash Untuk Reaksi Transesterifikasi Minyak Sawit Off Grade Menjadi Biodiesel Simbolon, Kristin Madelin; Helwani, Zuchra; Irianty, Rozanna Sri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Quail eggshells CaO based catalyst with the addition of fly ash has been successfully synthesized for production of biodiesel from palm oil off-grade. Quail eggshells waste modificated of solid base catalyst through calcination, hydration, dehydration methods with fly ash through impregnation method to load calcium oxide with quail eggshells as precursor.The catalyst was characterized by X-Ray Diffraction (XRD) and basic strength while the characterization of biodiesel was by Gas Chromatography-Mass Spectrometry (GC-MS). The catalyst was synthesized by calcining the quail eggshells as source of CaCO3 at calcination temperature of 900 oC for 2,5 hours. The CaO was then supported by fly ash. The catalyst with the highest catalytic activity was obtained at dehydration temperature of 500 oC and the dehydration time of 4 hours with transesterification reaction conditions of a molar ratio of methanol/oil 6:1, catalyst concetration of 6%-b oil and temperature of 70 °C for 2 hours with yield biodiesel results reached 85,12%.Keyword: biodiesel, calcium oxide, catalysts, fly ash, transesterification

Aplikasi Hidroksiapatit Sebagai Adsorben Kolesterol Hidayat, Muhammad Ariful; Azis, Yelmida; Irianty, Rozanna Sri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Hydroxyapatite is a natural mineral form of calcium apatite and is a major inorganic component of human hard tissue, such as bones and teeth. Synthetic hydroxyapatite, is widely used as implant and filler material for bone and tooth decay, catalyst, carrier catalyst and adsorbent. Synthetic hydroxyapatite has a large and porous surface area, which makes it very advantageous to be used as an adsorbent. Hydroxyapatite has been widely used as an adsorbent for alkali metals and heavy metals. In this study synthetic hydroxyapatite is used as an adsorbent for cholesterol compounds in the solvent of hexane-ethyl acetate mixture. The study was carried out with variations of hydroxyapatite mass (0.5, 0.75, and 1.0 gram) and cholesterol concentrations (50, 75 and 100 ppm) at a stirring rate of 100 rpm at room temperature. Adsorbed cholesterol was then analyzed using a UV-Vis spectrophotometer. From UV-Vis spectrophotometer analysis,it was found that be known the efficiency of adsorption process reaches 48.9% and the adsorption capacity is up to 6.87 mg / gram.Keywords: adsorbent, cholesterol, hydroxyapatite

Pembuatan Briket Dari Kulit Kacang Tanah Dan Kulit Kopi Dengan Getah Damar Sebagai Perekat Manalu, Bonita Restana; Irianty, Rozanna Sri; Zultiniar, Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Bio-charcoal briquettes are one of the ingredients of fuel that derived from biomass. Biomass is one of the sources of energy that can be replaces. One of biomass that is used in this research is coffee skin and peanut skin. The research is aimed to utilize waste biomass as material fuel alternatives and determine the best comparison of coffee skin and peanut skin. This research is carried out a comparison between coffee skin and peanut skin with a ratio is 1:1, 1:2, 1:3, 2:1 and 3:1 with the amount of damar resin 20% w/w. tests were carried out the water content, ash content, volatile matter, heat value, and rate of combustion. The result of the analysis are obtained: the lowest water content for the ratio 3:1 at 12.85%, the lowest ash content at the ratio 2:1 at 7.07%, the lowest volatile matter for the ratio 1:3 at 48.26%, the highest heating value for the ratio 3:1 at 7151.32 cal/g and the best rate of combustion for the ratio 1:1 at 0.1716 g/min. Keywords: Briquette Charcoal, Coffee Skin, Damar, Peanut Skin

PEMBUATAN KOMPOS DARI LIMBAH PADAT (SLUDGE) PABRIK PULP DAN PAPER Maria Peratenta Sembiring; Rozanna Sri Irianty
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.213

One of the method to use pulp and paper mill sludge was convert it become a compost. This research result showed that time variation of compost have different physical and organic matter properties. In physical properties, 3 months of compost had 12.57% moisture content, while organic matter contain 10.56% carbon, 1.07% nitrogen, and 9.87 C/N ratio. For 4 months compost had 6.79% moisture content, 11.88% carbon, 0.91% nitrogen, and 13.05 C/N ratio. Nutrients content from both composts appropriate with the standard value of National Standarisation Body.

PENGARUH KONSENTRASI INHIBITOR EKSTRAK DAUN GAMBIR DENGAN PELARUT ETANOL-AIR TERHADAP LAJU KOROSI BESI PADA AIR LAUT Rozanna Sri Irianty; Maria Peratenta Sembiring
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.218

The important properties to overcome the corrosion are safe, available, biodegradable, low cost, and environmental friendly. Gambier leaves extract is one of the inhibitor that have environmental friendly properties. This study aims to determine the effectiveness of extract using ethanol-water to reduce the corrosion rate. Soaking of ferrous iron plate samples in seawater media have done for corrosion test. Agitator and aerator motors at turn-on and conducted a series of immersion with varying contact time 5, 10, 15, and 20 days. After the time up next ferrous iron plate samples were cleaned, dried, and weighed. Experiment was repeated by adding a inhibitor heavy leaves gambier extract with varying leaves gambier extract, 1000, 3000, and 5000 ppm. Soaking iron plate samples performed at varying pH at 3(acid), 6 (netral), and 9 (alkaline). Calculation is then performed and the rate of corrosion inhibition efficiency gambier leaves extract with ethanol-water solvent. On the immersion of iron plate without inhibitor, the result that the longer the contact time, the weight of the iron plate was reduced. The results showed the addition of inhibitors of leaves extract gambier with ethanol-water solvent into the corrosive media can reduce the rate of corrosion. Inhibitor of leaves extract gambier using ethanol-water solvent effective to reduce the rate of corrosion inhibitor at a concentration of 5000 ppm and contact time of 20 days with the lowest value of the corrosion rate is 0.000503 g/cm2 days in seawater media at initial pH 7.9. Gambier extracts gave greatest inhibition efficiency about 60.345% obtained at a concentration of 5000 ppm inhibitor and 20 days contact time.

KONVERSI WASTE COOKING OIL (WCO) MENJADI BIODIESEL MENGGUNAKAN KATALIS BASA HETEROGEN Na2O/Fe3O4 Rozanna Sri Irianty; Hery Fiza Simarmata; Edy Saputra
Jurnal Sains dan Teknologi Vol 16, No 1 (2017): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Katalis sodium oksida (Na2O) di sangga pada ferric oksida (Fe3O4) telah di sintesis dan di uji untuk menkonversikan minyak goreng bekas menjadi biodiesel. Sifat Fisik-Kimia dari katalis sodium oksida di karakterisasi dengan menggunakan X-ray diffraksi (XRD) dan Fourier transform infrared (FTIR). Hasil penelitian di dapatkan loding katalis 3%-b adalah yang paling efektif pada reaksi esterifikasi, dibandingkan dengan loading katalis yang lain yaitu 4%-b dan 5%-b. Yield biodiesel dapat diperoleh yaitu sebesar 95.45% pada 2 jam pada kondisi 1:10 (molar rasio dari methanol/minyak goreng bekas), dan 3%-b katalis loading, pada pengadukan 300 rpm dan suhu 60 oC. Karekteristik dari produk biodiesel yang didapat sesuai dengan standard SNI 04-782-2006.

Sintesis Zeolit 4A Dari Bahan Dasar Abu Limbah Sawit Dengan Variasi Lama Pengadukan Gel Dan Perbandingan Volume Natrium Silikat Dengan Natrium Aluminat Nila Sari Siregar; Fajril Akbar; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Zeolite 4A is one of the synthetic zeolite which it is used as ion exchange. This zeolite can be synthesized from silica and alumina. This study aims to utilize the waste in the oil industry as the base material zeolite 4A synthesis and get the best conditions influence the volume ratio of reactants (sodium silicate/sodium aluminate), and long agitation in 4A zeolite synthesis process. 4A zeolite can be synthesized from the ashes of waste oil were melted with sodium hydroxide to make sodium silicate. 4A zeolite synthesis reaction process is done by mixing the reactants (sodium silicate and sodium aluminate) with variation 55:45, 60:40 and 65:35 v:v as well as the long stirring time of 1, 2 and 3 hours, followed by heating at 80 ° C for 8 hours. Zeolite synthesis results were characterized using Fourier Transform Infrared Spectrophotometry (FTIR) and X-ray Diffraction (XRD). Zeolite 4A crystallinity best result on the condition of the reactants variation 65:35 ml:ml with stirring 3 hours long and the highest ratio of 1.499.Keywords : ash waste oil, spektofotometri FTIR, XRD, zeolite 4A.

Peluruhan Batang Grafit Baterai Bekas Dengan Metode Electrochemical Exfoliation Menggunakan Pelarut Amonium Sulfat Dan Kalium Sulfat Michael Hutapea; Amun Amri; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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One way to exfoliate the graphene is by electrochemical exfoliation graphite (EEG) method which is the method for graphene synthesis by splitting graphite material into graphene sheets through the electrochemical process. The objective of this research is to synthesis graphene from used battery graphite rod using [(NH4)2SO4] and (K2SO4) and to determinethe effect of solvent variation and solvent concentration on the graphite decay rate. The results showed that the increase of solvent concentration increased the yield. The highestyield for the solvents [(NH4)2SO4] and (K2SO4) were 10,6% and 15,3% repectively. The result of UV-Vis spectrophotometric wave peak was ~270 nm that indicating the peak of graphene.Raman spectroscopy analysis result showed that the graphene was nanoplatelet (multi-layer) and the number of graphene layers was ~3-10 layer. FTIR analysis showed the functionalgroups after decay process on graphite. The best conductivity was K2SO4 solvent 1,5 M is 0,0621 Ω-1.cm-1.Keywords: electrochemical exfoliation graphite, graphene, graphite.

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