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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Sagu
Rozanna Sri Irianty
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (384.562 KB) | DOI: 10.31258/jst.v16.n1.p1-6

Abstract

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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Abstract

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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Abstract

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.
Pembuatan Mortar Geopolimer Berbasis Palm Oil Fly Ash-Grafena (Pofa-Grafena) Dengan Variasi Rasio Pofa/Pasir Dan Berat Grafena Yola Bertilsya Hendri; 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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Abstract

Geopolymer mortar is a mortar produced by reacting a high concentrated alkaline solution with precursors containing high alumina and silica contents. The use of geopolymer mortar can replace the use of ordinary portland cement (OPC) in the construction industry. Thisresearch aims to synthesize palm oil fly ash (POFA) based geopolymer mortar with the addition of graphene nanosheets, to determine the effect of POFA-to-sand composition ratio, and variations of graphene to mechanical properties and morphology of geopolymer mortar. The research was conducted by varying the ratio of POFA-to-sand (1:0, 1:1, 1:2, and 2:1 by mass ratio), variations of graphene (0, 0,1, 0,35, and 0,5% by weight), curing time (24 h) and curing temperature (60℃). Scannning Electron Microscope (SEM) analysis showed that the addition of sand and graphene reduced the porosity of geopolymer mortar. The compressivestrength test results showed that the highest compressive strength (16,4 MPa) was obtained at POFA-to-sand ratio of 2:1 and 0,5% wt graphene content. While the lowest compressive strength (5,4 MPa) was obtained at the POFA-to-sand ratio of 1:2 and 0% wt graphenecontent.Keywords: alumina, silica, alkaline activator, crystalline, geopolymerization
Sintesis Zeolit 4A Dari Abu Limbah Sawit Dengan Variasi Suhu Pembentukan Gel Dan Variasi Volume Natrium Silikat Dengan Natrium Aluminat Nur Asia; 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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Abstract

Zeolite 4A is one of the synthetic zeolite which it is used as ion exchange. This zeolite can be synthesized from silica and alumina. In this research, the palm ash is used as source of silica. The purpose of this research is produce the zeolite 4A by using palm ash and getting the best condition of synthesis zeolite 4A. Synthesis of zeolite 4A made by mixing sodium silicate and sodium aluminate with variation of volume at 55:45 and 60:40 mL:mL and variety of gelling temperatures are 60, 70, and 80oC with rate of agitation at 200 rpm. Then the gel formed will be heated in the oven at 80oC for 8 hours and washed it until it’s pH neutral. After that, dried it at 120oC for 3 hours. The synthesis product is analyzed by using spectrophotometry fourier transform infra red (FTIR) and X ray diffraction (XRD). The best conditions of cristalization toproduce the zeolite 4A by using palm ash are temperature at 60oC and variation of volume at 55:45 mL:mL.Keywords : palm ash, spectrophotometry ftir, xrd, zeolite 4A
Modifikasi Kulit Telur Puyuh Dan Serbuk Besi Menjadi Katalis CaO/Serbuk Besi Untuk Reaksi Transesterifikasi Minyak Sawit Off Grade Produksi Biodiesel Vandhe Melsa Sembiring; Zuchra Helwani; Rozanna Sri Irianty
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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Abstract

Biodiesel can be synthesized from palm oil off grade using a CaO / iron powder catalyst in the transesterification stage. This study aims to produce biodiesel from low-quality raw materials and determine the effect of the process by looking at the effect of process conditions such as dehydration temperature and dehydration temperature on biodiesel yield. The process of making biodiesel is carried out by esterification and transesterification reactions. The catalyst with the highest catalytic activity was obtained at a dehydration temperature of 600°C and dehydration time for 3 hours with the condition of the transesterification reaction at 10:1 molar ratio of methanol/oil, catalyst concentration of 1% -b oil, reaction temperature of 70° C for 2 hours with yield biodiesel reached 90%. Keywords: biodiesel, CaO, off grade palm oil, iron powder, transesterification.
Model Kesetimbangan Adsorpsi Zat Warna Direct Brown Dengan Menggunakan Abu Terbang (Fly Ash) Batubara Sudung Sugiarto Siallagan; Rozanna Sri Irianty; Zultiniar Zultiniar
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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Abstract

The Increasing use of dyes in various industries causes environmental problems that must be addressed. Various methods have been done to reduce the dye waste, one of which is adsorption. Using of inexpensive and easily obtained adsorbents is one of the considerations in choosing the type of adsorbent used. The purpose of this research was to determine the ability of activated fly ash with HCl by adsorbing Direct Brown dyes at equilibrium with variations in concentration of dyes and adsorption temperature and determining the adsorption equilibrium model. This research was carried out by varying the concentration of dyes (10,20, and 30, ppm) and the adsorption temperature (27, and 37, oC). The result showed that the best temperature of adsorbent for adsorbing Direct Brown at 140 minutes was 37 oC with concentration of dyes 30 ppm with mass of adsorben 2 gram. And 96,59% of adsorption efectiveness. The adsorption mechanism meets the FreundLich isotherm model with a values of R2 equal to 1. The equilibrium curve Qe vs Ce showed that equilibrium model is freunlich model with smallest error correction. Key Words : adsorption, activation, dye waste, fly ash, Direct Brown.
Pengendalian Laju Korosi Baja Karbon Menggunakan Inhibitor Ekstrak Daun Jambu Biji (Psidium Guajava, Linn) Dengan Metode Maserasi Kartono Kartono; Komalasari Komalasari; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Guava leaf extract has a considerable influence in decreasing the corrosion rate of a metal, because it contains tannin compounds which can be used as corrosion inhibitors. The purpose of this study was to determine the effect of addition of guava leaf extract inhibitors on the corrosion rate of carbon steel with variations in immersion time and determine the inhibition efficiency of variations in the concentration of guava leaf extract on carbon steel in corrosive media. The parameters varied in this study were the immersion time of the maceration process, the inhibitor concentration added in the corrosive solution of hydrochloric acid, namely 0; 0.5; 1.0 and 1.5 g/L as well as variations in the time of corrosion testing at 12, 24, 36 and 48 hours. The time of maceration process shows that the longer the contact time, the greater the concentration of crude tannin, while the time of immersion of steel shows the longer the immersion time, the corrosion rate tends to decrease with the addition of inhibitors and the higher the value of inhibitory efficiency. The best crude tannin concentration was obtained during the maceration process for 6 days with crude tannin concentration of 86.46 mg/L. The lowest corrosion rate was obtained on the addition of 1.5 g/L inhibitors with a 48 hours immersion time of 7.36 mm/year. The highest corrosion rate is without the addition of an inhibitor with a 36 hours immersion time of 26.09 mm/year. The results showed the best inhibition efficiency values using guava leaf extract inhibitors on the addition of 1.5 g/L inhibitors in soaked for 48 hours in 0.5 M hydrochloric acid corrosive media with an efficiency value of 70.31%.Keywords: carbon steel, corrosion rate, guava leaves, inhibitors, maceration
Model Kesetimbangan Adsorpsi Zat Warna Direct Brown menggunakan Limbah Padat Pulp Dan Kertas (Dregs) Dengan Proses Batch Chandra Marzuki Nababan; Rozanna Sri Irianty; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Particularly, industrial waste color paper mill is one of the causes of environmental problems that require the removal of an effective and efficient. Adsorption is a separation method that is simple and easy to operation. The purpose of this research study the ability of solid waste and paper pulp (dregs) adsorb dye brown and learn direct equilibrium models adsorption against adsorbent mass variations and temperature adsorption operation. The maximum wavelength of the dye Direct Brown 417 nm. The highest removal efficiency of concentration was 93.57%. Equilibrium models corresponding to the direct-brown dye adsorption use solid waste pulp and paper (dregs) was the Langmuir isotherm. The result of correlation factor (R2) was 0.9488.Keywords : Direct dyes, dregs, adsorption, isotherms Lagmuir, correlation factor
Modifikasi Aspal Konvensional Penetrasi 60/70 Menggunakan Lateks Kebun Dengan Variasi Konsentrasi Dan Kadar Karet Kering Lateks Rani Yuliantari; Rozanna Sri Irianty; Bahruddin Bahruddin
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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Abstract

Natural rubber is an natural polymer that is potentially used as n asphalt additive. This research aims to determine influence of dry rubber content and amount of field latex to asphalt modified properties. In this study, has been used are latex with 22% of dry rubber content (non centrifugated) and 56% of dry rubber content (centrifugated). The sample made by adding field latex in to asphalt at 160ºC with 20 minute of blending time. The concentrations of latex were 5.0%, 7.5%, 10.0%, 12.5% and 15.0% w/w in the mixture. The samples were tests included penetration, softening point, marshall stability, and penetration after loosing weight, with standard of Spesifikasi Umum Binamarga Divisi 6.2010. The result showed that dry rubber content and amount of latex affects the value of test parameters asphalt modified. The best result is obtained from adding 10% w/w non centrifugated latex with penetration, softening point, stability, and penetration after TFOT, respected are 56 dmm, 58ºC, 1554 kg and 55 dmm. The result of this study indicated that addition of non centrifugated latex can improve asphalt properties.Keywords: asphalt modified, asphalt properties, dry rubber content, field lateks, polymer
Co-Authors Abdullah Agung Hayyuka Ahmad Fadli Amun Amri Bahruddin Chandra Marzuki Nababan Edy Saputra Fajril Akbar Hery Fiza Simarmata Jhon Armedi Pinem Kartono Kartono Komalasari Komalasari Michael Hutapea Nila Sari Siregar Nur Asia Nursyaniati Nursyaniati Rahmat Ilham Rani Yuliantari Riris Verawati Ryan Tito Sanredina Sanredina Sastra Silvester Ginting Silvia Reni Yenti Suci Afrianti Sudung Sugiarto Siallagan Vandhe Melsa Sembiring Vany Silvia Viona Aulia Rahmi Yelmida Azis Yola Bertilsya Hendri Zuchra Helwani Zultiniar Zultiniar