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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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Adsorpsi Zat Warna Rhodamin B Menggunakan Abu Terbang (Fly Ash) Batubara Teraktivasi Dengan Variasi Massa Adsorben Dan Suhu Adsorpsi Riris Verawati; 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 NaOH by adsorbing Rhodamine B dyes at equilibrium with variations in adsorbent mass and adsorption temperature and determining the adsorption equilibrium model. This research was carried out by varying the mass of the adsorbent and the adsorption temperature. The result showed that the best mass of adsorbent for adsorbing rhodamine B at 140 minutes was 5 grams at an adsorption temperature 55 to obtain 89% of adsorption efectiveness. The adsorption mechanism meets the FreundLich isotherm model with a values of R2 equal to 0,935.   Keywords: adsorption, activation, dye waste, fly ash, rhodamin B
Penentuan Model Kesetimbangan Adsorpsi Direct Brown Menggunakan Hidroksiapatit Ryan Tito; Yelmida Azis; 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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The adsorption equilibrium model was carried out to find out the appropriate adsorption mechanism in the direct brown adsorption process using hydroxyapatite. The aim of this study was to determine the equilibrium time, the effects of direct brown’s initial concentration, adsorption temperatures and the adsorption equilibrium models. Analysis was conducted by spectrophotometric method, then tested on the Langmuir, Freundlich and Brunauer - Emmett - Teller (BET) isotherm model. The result showed that the best initial concentration of direct brown for adsorption using hydroxyapatite at 160 minutes was 10 ppm at adsorption temperature 30 with adsorption capacity 4,65 mg/g and 93,12% of removal efficiency. The adsorption followed the Freundlich isotherm model. The thermodynamic parameters (ΔH = -8,77 kJ/mol, ΔG < 0 dan ΔS = -30,88 J/mol K) indicated that the adsorption process was a physically and spontaneously excothermic reaction. Keywords: adsorption, hydroxyapatite, direct brown, Freundlich, isotherm.
Pengaruh Massa Adssorben Terhadap Adsorpsi Pergasol Red Dengan Proses Batch Menggunakan Cangkang Kulit Telur Terkalsinasi Sanredina Sanredina; Rozanna Sri Irianty; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Waste dye untreated directly discharged into the environment and society can result in negative impacts on people's lives. One effort to reduce the content of azo dyes in solution Pergasol Red namely the adsorption process. The purpose of this study to determine the effect of mass adsorption at adsorption Pergasol Red uses powdered eggshells calcined. Pergasol Red 60 ppm solution of 200 mL added with a trowel powdered eggs with a variety of mass 1 g and 2 grdidalam erlenmeyer stirred with a speed of 200 rpm 40 ° C. Then the solution was analyzed using a UV-VIS spectrophotometer to determine the final concentration Pergasol Red after absorption. The more the number of egg shell powder mass concentration Pergasol Red adsorbed higher. A mass of 1 g and 2 g Pergasol Red adsorbed concentration as much as 56.3 ppm and 57.6 ppm with the effectiveness of the absorption of 96.1%. Keywords: adsorption, skin powdered eggs, Pergasol Red,
Proteksi Katodik Dengan Menggunakan Anoda Korban Pada Struktur Baja Karbon Dalam Larutan Natrium Klorida Rahmat Ilham; Komalasari Komalasari; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Pipe installation of oil and gas processing are located on land or at sea are generally made of carbon steel are susceptible to corrosion by the environment. A system to protect the corrosion of carbon steel is a sacrificial anode cathodic protection. Sample material used is low carbon steel with aluminum and zinc sacrificial anodes.Test condensation used is NaCl at a concentration of 500 ppm, 5.000 ppm, 15.000 ppm and 30.000 ppm then performed by varying the distance between the anode and cathode at a distance of 2 cm,3 cm and 4 cm. The results using the sacrificial anode aluminum and zinc. Where the best results in the sacrificial anode aluminum with carbon steel corrosion rate of 1,08 mpy for NaCl concentration of 500 ppm with the distance between electrodes 2 cm.Keywords: sacrificial anode, NaCl, corrosion rate, cathodik protection.
Sintesis Membran Selulosa Asetat Untuk Desalinasi Air Payau Vany Silvia; Jhon Armedi Pinem; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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One of energy that can be used to produce pure water in coastal areas of Riau is using cellulose acetate membrane. Raw material used in this experiment is a cellulose acetate, acetone and formamide. This research aims to make cellulose acetate membrane for brackish water treatment process into pure water with cellulose acetate variations of 16%,17%,18%,19% and 20% and operating pressure is 2, 4, 6, 8 and 10 bar. The results obtained are greater then the composition of the cellulose acetate will be smaller flux produced and greater the rejection is generated. The greater the operating pressure, the greater the flux obtained and smaller the rejection obtained.Keywords : cellulose acetate, flux, membrane,rejection
Pengendalian Korosi Dengan Menggunakan Daun Nanas Sebagai Green Inhibitor Pada Baja ASTM A36 Viona Aulia Rahmi; 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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Corrosion is a decline quality of a metal because of chemical reaction a metal with its environment. The use of inhibitors is one way of corrosion control on metals, especially on the inside of the pipe. Pineapple leaf extract can be used as a green inhibitor. This study aims to utilize pineapple leaf extract as a green inhibitor about concentration of the inhibitor in controlling the corrosion rate by varying the time of the metal immersion. Extraction is done with a ratio of ethanol: distilled water, which is 1: 4. Research variations were corrosive media (0.1 M H2SO4), inhibitor concentrations (0, 2 gr/L) and immersion time (16, 32 and 48 hours). The method used is the weight loss method. The lowest corrosion rate in 0.1M H2SO4 solution is a concentration of 2 gr/L and a 48 hour immersion time of 20,686 mpy. The highest inhibitor efficiency in 0.1M H2SO4 solution concentration of 2 gr/L and time immersion for 48 hours amounted to 85.48%. It can be concluded that more inhibitors on corrosive media are able to produce low corrosion rates with high inhibition efficiency.Keywords: corrosion rate, inhibition efficiency, inhibitor, pineapple leaf
Pelepasan Doxorubicin (DOX) Dari Hidroksiapatit (HA) Dengan Variasi Nilai pH Dan Rasio Dox-Ha / Phosphat Buffer Saline (PBS) Nursyaniati Nursyaniati; Ahmad Fadli; 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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Hydroxyapatite was a material that could be used as drug delivery in cancer by doxorubicin adsorbed on to hydroxyapatities surface. The purpose of this research were to study the effect of variation of pH and ratio DOX-HA : PBS on speed release. HA was suspended in 10 ml of DOX (100 ppm) strirred using a magnetic stirrer with speed 250 rpm at temperature 37ºC for 24 hours. After that it filtered at vacuum pressure for 24 hours. The release of DOX from 270 mg HA powder were soaked in 350 ml of solution PBS (pH 5,6 dan 7,4). The samples were taken every two hours until 120 hours. The concentration of DOX’s released were analyzed by UV-Vis. Furthermore, the DOX-HA powder were characterized with FTIR. There was HA and DOX function group which meant, there were any DOX’s adsorbed and released from HA used powder. If higher pH and more HA powder were used, would effect the released of DOX were more effective. The released in the first 40 hours of DOX concentration released in PBS was maintained at 1,25 and 6,92 ppm for each pH 7,4 and 5,6. While for mass HA variations maintained at 0,625; 3,541; 4,508; and 4,958 ppm for each 0,2; 0,3; 0,4 dan 0,5 gram.Keywords : doxorubicin, drug delivery, hydroxyapatite, phosphat buffered saline, release.
Pengaruh Suhu Pembakaran Dan Konsentrasi Grafena Terhadap Karakteristik Batu Bata Suci Afrianti; Amun Amri; 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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This research aims to produce bricks by adding few layer graphene (FLG) and studies the effects of firing temperature and graphene concentration on the characteristics of the produced bricks. The produced bricks were tested their compressive strength, porosity, morphology using the scannning Electron Microscope (SEM), X-ray diffraction (XRD) analysis and fourier transform infrared (FTIR). The brick was made by adding the few layer graphene to the clay, then mixed them and casted in size (5x5x5) cm3. The samples then dried at room temperature for a week, and fired in furnace for 1 hour at the temperature variation of 600 °C, 800 ºC, and 1000 °C with graphene concentration variations of 10 mg/ml, 20 mg/ml and 30 mg/ml. The results showed that the highest compressive strength (9 MPa) and lowest porosity (6.1%) was exhibited by brick synthesized using graphene concentration of 30 mg/ml and the firing temperature of 1000°C. The Scannning Electron Microscope (SEM) analysis results showed that the addition of graphene reduced the porosity of the brick. The X-ray diffraction (XRD) analysis results showed that a diffraction peak of few layer graphene at 25.41º and the graphene did not influenced the crystal structure of the brick. This research showed that the increase in firing temperature and concentration of graphene made the structure of the brick increasingly dense. The few layer graphene could improve mechanical strength of the brick by reduce the stress concentration and prevent the development of the cracks.Keywords : bricks, concentration, compressive strength, few layer graphene, firing, graphene, porosity
Pengaruh Kombinasi Proses Pretreatment (Koagulasi-Flokulasi) Dan Membran Reverse Osmosis Untuk Pengolahan Air Payau Sastra Silvester Ginting; Jhon Armedi Pinem; 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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In general, Riau coastal communities difficult to get clean water because the water resources in the coastal areas of brackish water is not to be used for everyday life. Therefore, the necessary technology for processing brackish water into clean water. This research aims to determine the performance of the process of coagulation-flocculation and reverse osmosis membrane on processing brackish water into clean water. Reverse osmosis membrane used is a type of spiral wound measuring 0,0001 μm and coagulant used PAC coagulant. In this study, the variable used is the concentration of PAC coagulant and reverse osmosis membrane operating pressure. Experiment result obtained the optimum condition of PAC coagulant concentration is 150 mg/L, which PAC can be designated turbidity up to 88.46% and 91.84% hardness. At a pressure of 8 bar, permeate flux preceded by coagulation-flocculation of 25.81 L/m2.jam. Rejection coefficient at a pressure of 8 bar brackish water after coagulation-flocculation had 98.72% of TDS; 96.99% of turbidity; 97.62% of organic substances; 96.37% of hardness and 92.4% chloride.Keywords: brackish water, coagulation-flocculation, reverse osmosis membranes.
PENGARUH PERBANDINGAN PELARUT ETANOL-AIR TERHADAP KADAR TANIN PADA SOKLETASI DAUN GAMBIR (Uncaria gambir Roxb) Rozanna Sri Irianty; Silvia Reni Yenti
Jurnal Sagu Vol 13, No 1 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1500.112 KB) | DOI: 10.31258/sagu.v13i1.2129

Abstract

The sale value is measured from tanin levels. Gambier that was produced by society by soaking with waterlevels tanin 37.25 ppm. Sokletasi extraction method give extracts yield higher because of the warming isexpected to improve the solubility of the extract so that obtained extract higher. Tannins are a class ofcompounds which belong to the class of polyphenols that can be found in almost all types of geen plants. Thisstudy did sokletasi gambier leaves with water ethanol solvent composition variation 1;1, 1;2, 1;4 to obtainan extract gambier with tanin highest levels. Treatment includes draining the leaves of gambier , ginding,sifting, sokletasi and evaporation. Subsequently, 5 ml of the filtrate of yield was added FeCl3 to qualitativeanalysis, the rest is evaporated to obtain gambier extract and for quantitative analysis using UV-visspectrophotometer. The results yield the largest gambier leaves extract on ethanol-water 1:2 at 63.7% andthe highest levels of tannins in ethanol-water 1:4 solvent at 94.75 ppm.Key words: gambier leaves, sokletasi, tannins.
Co-Authors Abdullah Agung Hayyuka Ahmad Fadli Amun Amri Bahruddin Chandra Marzuki Nababan Edy Saputra Fajril Akbar Hendri, Yola Bertilsya 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 Zuchra Helwani Zultiniar Zultiniar