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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Ilmiah Biosaintropis (Bioscience-Tropic) Unri Conference Series: Community Engagement Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks
Drastinawati Drastinawati
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Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Engineering Environmental Science Medicine & Pharmacology Social Sciences Other

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Konversi Kitin Menjadi Kitosan Dari Limbah Industri Ebi Ongky Alexander; Ahmad Fadli; Drastinawati Drastinawati
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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Chitin can be transformed into chitosan by deacetylation process using chemical methods. Chitosan many applied in various fields especially in the field of biomaterials. The purpose of this research to study the effect of the mass ratio of chitin and NaOH volume of the reaction time in the process of deacetylation. Shrimp shells in the puree with a size of 50 mesh. Chitin in shrimp shell powder are in isolation with process deproteination and demineralization. Chitin which has been synthesized and then transformed into chitosan by deacetylation process operating conditions with a temperature of 120oC, stirring speed of 150 rpm, the mass ratio of chitin and NaOH 50% volume 1:15, 1:20, 1:25 (w/v) and time reaction of 0.5; 1; 1.5; 2; 2.5 and 3 hours. The results showed that increasing the value of the mass ratio of chitin and NaOH volume of the reaction time resulting in increased degree of deacetylation and depreciation ash content and yield of chitosan, while the water content does not have a significant effect. On the addition of NaOH volume 15 , 20 and 25 ml , and the reaction time of 0.5 ; 1; 1.5; 2; 2,5; 3 hours have the value of yield, moisture content, ash content, degree of deacetylation and molecular weight respectively ranged from 86.6-63.5%, 1.21-1.00 %, 1.93-1.06 %, 67.52-86.09 % and 2,699 x109-2,9334 x109 g/mol.Keywords: deacetylation; demineralization; deproteination; chitin; chitosan;
Model Kesetimbangan Adsorpsi Logam Tembaga (Cu (II)) Menggunakan Cangkang Kepiting Sebagai Adsorben Reny Nur Hidayah; Drastinawati Drastinawati; Silvia Reni Yenti
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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Copper metal pollution (Cu (II)) in the water has a negative impact on people's lives. One effort to reduce the copper metal content is by the adsorption process. The purpose of this study was todetermine the effect of adsorption temperature (30, 40, 50 ° C) and adsorbate concentration (2, 3, 4 mg / L) and to test the adsorption isotherm equilibrium model on the adsorption Cu (II) bycrab shell by model equation approach Langmuir and Freundlich. The results showed if the adsorption temperature rise, the adsorbent adsorption capacity of crab shells (qe) is decreasedand if the concentration is decreased, the adsorbent adsorption capacity of crab shells (qe) is increased. The highest absorption rate was obtained at 30 ° C with a concentration of 4 mg / Lof adsorbate at 1.558 mg / g. The copper metal adsorption mechanism (Cu (II)) by the crab shellhas a match with the Freundlich isoterm model which represents the physical and adsorption Freundlich isoterm model which represents the chemical adsorption.Keywords: Adsorption, Crab Shell, Equilibrium Model, Copper (II)
Pemanfaatan Limbah Fly Ash Batubara Untuk Pembuatan Paving Block Geopolimer Dengan Variasi Temperatur Curing Dan Rasio Larutan Aktivator Terhadap Fly Ash Wasty Rusjaya; Ahmad Fadli; Drastinawati Drastinawati
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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Paving blocks used as a construction material for roads, parking area, and city parks. The objectives of this research are to make paving blocks of coal fly ash as a raw material in the manufacturing paving blocks, investigate the effect of curing temperature and the ratio of liquid activator/fly ash on the characteristics of the paving block (compressive strength, porosity, density, crystallinity, and morphology) and testing Toxicity Characteristic Leaching Procedure (TCLP) paving block geopolymer. 247,5 gr of coal fly ash were mixed with 742,5 gr of aggregate (sand) and added 82,88 gr of liquid activator as well as 1,26 gr of superplasticizer inside the container. Then, the mixture was strirred and pour into cube mould with size 5x5x5 cm3, subsequently put at room temperature for 24 hours and dried at a curing temperature of 60 °C, 80 °C, 100 °C. The characteristics of were compressive strength, porosity, density, TCLP, crystallinity, and morphology determined. The result show that increasing curing temperature lead to increasing compressive strength and density while the porosity decreased. The compressive strength, porosity, and density of paving blocks were 19,73-49,33 MPa; 4,0-7,6%; 2,0-2,3 g/cm3; respectively and metal contents Zn, Pb, Cu, Cd were 3,591 mg/L; 1,577 mg/L; 1,079 mg/L; and 0,223 mg/L; respectively. The highes of compressive strength 49,33 MPa was obtained at paving blocks paper at the curing temperature of 100 °C and the ratio of liquid activator/fly ash of 0,7.Keywords: curing temperature; fly ash; geopolymer; paving block; liquid activator
Pemanfaatan Limbah Fly Ash Batubara Untuk Pembuatan Paving Block Geopolimer Dengan Variasi Konsentrasi NaOH Dan Rasio Natrium Silika Terhadap Natrium Hidroksida (Na2SiO3/NaOH) Wyda N Saragi; Ahmad Fadli; Drastinawati Drastinawati
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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Paving block geopolymer is a material synthesized through a polymerization process which can be used in the construction, especially of homes, buildings and roads. The objective of this research are to determine the effect of the concentration of NaOH and sodium silica to sodium hydroxide ratio (Na2SiO3 / NaOH) and characterization of geopolymer paving blocks made from coal ash. Paving block geopolymer prepared by mixing coal ash and fine aggregate and then added liquid activator (sodium hydroxide and sodium silica). Paving block pour into cube mould with size 5x5x5 cm3. Subsequently the mixture put at room temperature for 24 hours and then dried at curing temperature of 90 ° C for 24 hours. Characteristic of geopolymer paving blocks ie compressive strength, density, porosity, morphology and TCLP test were determined. The compressive strength of paving block geopolymer increase with concentration NaOH and sodium silica to sodium hydroxide ratio. The obtained of compressive strength of paving block geopolymer of 13,730 MPa at concentration NaOH 10M and increase to 19,068 Mpa at concentration NaOH 14 M. The highest density of paving block geopolymer is 2,17 gr/cm3 at concentration NaOH 14 M.Key words : fly ash, geopolymer paving block, sodium hydroxide, sodium silicate
Kinetika Reaksi Demineralisasi Isolasi Kitin Dari Cangkang Ebi Subkhan Maulana; Ahmad Fadli; Drastinawati Drastinawati
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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Chitin is a naturally abundant polymer and most of it was used as a surfactan and cosmetic raw material. Chitin be able to derive from natural source like shrimp shell waste. The aims of this research were to study the effect of various of time reaction and HCl concentration towards both of calcium concentration reduction and demineralization kinetic model with approach to shrinking core model (SCM). There are 3 stage of model which be able to use: Film layer diffusion, Diffusion through the outcome layer and Chemical reaction. It was began with deproteination at first with NaOH 3,5 % and continued with demineralization using HCl at concentration 0,3 N; 0,6 N; 0,9 N and 1,2 N with variation of reaction time at 15, 30 and 15 minute. The specimen had dried in the oven before the calcium analyzed. The results showed calcium concentration decrease along with increasing of HCl concentration. It get kinetic model at concentration 0,3 N of HCl usage with form: 1−(
Sintesis Kitosan Dari Limbah Cangkang Kepiting Dengan Variasi Konsentrasi Naoh Dan Kecepatan Pengadukan Aisyah Rani; Drastinawati Drastinawati; Yusnimar Yusnimar
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 parameter that determines the quality of chitosan is the value of deacetylation degree. The degree of deacetylation is influenced by the concentration of NaOH and the stirring speed used in the deacetylation process. The combination of NaOH concentration and the right stirring speed will produce chitosan with a high degree of deacetylation and good quality. The purpose of this study was to determine the effect of using NaOH concentration and the speed of stirring on the characteristics of chitosan produced from crab shells. Crab shells was deproteinated with 3.5% NaOH at 65ºC for 2 hours, the result of deproteination process is crude chitin. Crude chitin was demineralized with 1 N HCl at 30ºC for 1 hour, the result of the demineralization process is chitin. Chitin was deacetylated with NaOH concentration of 40%, 60% and 80%, the deacetylation process took place at a temperature of 120ºC for 3 hours with a stirring speed of 100 rpm, 150 rpm and 200 rpm, the deacetylation process was carried out with two replications. Chitosan obtained was tested by Fourier Transform Infra-Red Spectrophotometer (FTIR). The obtained deacetylation degree of chitosan produced ranged from 70.88% - 85.39%. The chitosan yield produced ranged from 64.5% - 72.3%. The levels of chitosan ash produced ranged from 1.45% - 2%, while the water content of chitosan produced ranged from 1.45% - 2%.Keywords : crab shell, deacetylation. chitosan, FTIR, deacetylation degree
Pemanfaatan Ekstrak Kulit Pisang Sebagai Green Inhibitor Dengan Metode Maserasi Dalam Upaya Mengendalikan Korosi Pada Baja ASTM 36 Harfiah Faradila; Komalasari Komalasari; Drastinawati Drastinawati
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 the interaction of materials with the environment that result in damage to material and the environment. a method of restricting the occurrence of corrosion processes with inhibitors. An organic inhibitor that is an inhibitor that is made from natural materials available in nature. Extract of banana peels contains tannin compounds that can prevent corrosion. The purpose of the research was to determine yield and extract of banana peels maceration method, determine the rate of steel corrosion using inhibitor corrosion, and determine the influence of the concentration of inhibitor, corrosion, media and contact time variation of the rate of corrosion. This research began with extract of banana peels is done by the method of contact during the maceration time with the 7hari. Then proceed with the contact of steel corrosion on media that is HCl and NaOH concentration extract with 0 gr/L and 1 g/L on the contact time of 12, 24, 48, 72 hours. The results of this study showed the greater the concentration of the inhibitor of the smaller banana peels extracts the rate of corrosion.Keywords: banana peels, carbon steel ASTM 36, corrosion rate, green inhibitor.
Adsorpsi Tembaga (Cu (II)) Menggunakan Limbah Cangkang Kepiting Rida Sari Juli Anti; Drastinawati Drastinawati; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Adsorption is one of the most widely used techniques for controlling water pollution. Adsorption kinetics are very important to determine the performance of the adsorbent and get the mechanism that occurs during the adsorption process. The purpose of this study was to determine the effect of metal concentration and adsorption time on crab shell absorption and to test the Cu (II)adsorption kinetics model using pseudo first order (Lagergren) and pseudo second order kinetics (Ho and McKay). Cu (II) solution with varying concentrations of 1,981 mg/l; 4,138 mg/l and6,263 mg/l are adsorbed using crab shells. The solution sample was taken with a time interval of 0, 10, 20, 30, 60, 90, 120 and 150 minutes as much as 10 mL then centrifuged. The centrifugedfiltrate is then analyzed using AAS to measure the remaining Cu (II) concentration. The results showed that the highest of adsorption capacity at the concentration of Cu (II) metal 1,981 mg/lwas 0,737 mg/g in the 30 minute; the concentration of 4,138 mg/l was 1,784 mg/g in the 60 minute and the concentration of 6,263 mg/l was 2,816 mg/g in the 90 minute. The fitted kineticmodel for Cu (II) adsorption using crab shells is pseudo second order model (Ho and McKay) with k2 value is 2,225; 1,432; 1,345 g/mg.min and qe value is 0,737; 1,784; 2,816 mg/g for aconcentration of 1,981; 4,138 and 6,263 mg/l.Keywords : adsorption, crab shells, Cu (II), adsorption capacity, kinetics.
Pemisahan Emas Pada Motherboard Komputer Dengan Metode Elektrolisis Ricson Rinaldi; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Gold metal has been using in electronics and telecommunication industry, for example, Motherboard computer. The separation of gold from the Motherboard computer has been done in this study. To get the maximum results in the separation of the are gold used variations potential difference ( 6; 9; 12 volt ) and the type of precipitant (NaHSO3 and H2C2O4) . In this study, a certain number of samples is used samples Motherboard computer electrolyzed H2SO4 for 1 hour. The precipitate formed is separated from the filtrate. The precipitate was dissolved in Aqua Regia at a temperature of 70˚C for 30 minutes further diluted with Aqua DM until the volume is 50 mL . Au concentration was analyzed by AAS (Atomic Absorption Spectrophotometry) and Au deposited with NaHSO3 and H2C2O4 . Based on the analysis result, the maximum Au concentration at the former Motherboard computer is equal to 2.285 ppm. For 5 grams of the sample , the maximum weight of Au precipitate obtained 0.97 grams by using H2C2O4 as a precipitant .Keywords : Au, motherboard computer, electrolisis, precipitant
Sintesis Magnetite/Hidroksiapatit Composite Menggunakan Metode Presipitasi Dengan Variasi Magnetite Dan Suhu Pemanasan Wiriyan Jordy; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Technologies in era of globalization had been improved especially for human health in biomedical. Magnetite/Hydroxyapatite composite is one of new promising idea as drug carrier for a drug delivery application. The purpose of this research is synthesis of the composite by using magnetite & hydroxyapatite, and analyze the effect of percentage of Fe and heating temperature to the characteristic of the composite were produced by using precipitation method. The powder of magnetite was dispersed in 50 ml of aquadest and mixed with Ca(NO3)2.4H2O for 30 minutes, and (NH4)2HPO4 added to the suspense. The pH of suspension was controlled by added NH4OH 25% until pH 11 with reaction for 120 minutes at 90ºC. The suspension was aged for 1 day, washed and separated the precipitated from suspense. The precipitate was dried until 1 day at 70ºC and ended with calcined the precipitate for 3 hours at 400ºC until powder of composite was collected. The powder of composite was characterized with XRD, and VSM. The higher heating temperature to 90ºC had affected higher crystallinity from 80.68% to 86.58%. However, the higher percentage of Fe had affected the crystal size of magnetite from 14.744 nm to 19.894 nm, with a good magnetization value was 8.81 emu/g. Based on the resulted from characterized of the composite, were concluded for the synthesis of composite magnetite/hydroxyapatite were succeeded and can be applied as a drug carrier in the drug delivery system. Keywords : composite, drug carrier, hydroxyapatite magnetite.
Co-Authors Ahmad Fadli Aisyah Rani Alfarisi, Cory Dian Ayu Annisya Tri Adriana Bima Wandika Putra Chairul Chairul Desi Heltina Edo Prima Arif Esti Rahmat Tini Frederika Mawarni Adilasari Nduru Harfiah Faradila Idral Amri Ika Karina Jhon Alperdo Julharmito Julharmito Juliani Dafis Komalasari Komalasari Mery Sukmiwati Muhammad Nur Rahim Sjam Mutamima, Anisa Nurfatihayati Ongky Alexander Onil Andika Padil Padil Reny Nur Hidayah Restika Rahayu Ricson Rinaldi Rida Sari Juli Anti Roni Roni Rusma Yanti Silvia Reni Yenti Subkhan Maulana Wasty Rusjaya Wiriyan Jordy Wisrayetti Wisrayetti Wyda N Saragi Yelmida Azis Yesi Afriani Yusnimar Sahan