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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Eksergi: Chemical Engineering Journal Stannum : Jurnal Sains dan Terapan Kimia Journal of Bioprocess Chemical and Environmental Engineering Science JURNAL REKAYASA KIMIA & LINGKUNGAN
Drastinawati Drastinawati, Drastinawati
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Model Kesetimbangan Pada Adsorpsi Ion Kadmium (Cd2+) Menggunakan Hidroksiapatit Dengan Variasi Konsentrasi Cd2+ Dan Dosis Adsorben Fifiyana, Rahma; Fadli, Ahmad; Drastinawati, Drastinawati
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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Release of ion Cadmium (Cd2+) onto water as result of industrial activities and its waste stream causes a negative impact for environment and human health. One of method that used for heavy metal removal is adsorption process. The purpose of this research was to adsorb ion Cd2+ by Hydroxyapatite (HAp) with initial concentration and adsorbent dosage variations then determine the appropriate using Langmuir, Freundlich and DKR isotherm models. In this research, the adsorption behavior of hydroxyapatite with respect to Cd2+ has been studied in order consider its application to purity metal finishing wastewater. Surface area of HAp obtained from the BET method was 6,68 m2/g. The batch adsorption method has been employed, using metal concentration in solution ranging from 20 to 40 mg/L. And dosage adsorbent ranging from 1 to 2 g/L. Cd2+ concentration in the solution was analyzed using AAS. The Langmuir, Freundlich and Dubinin- Kaganer- Radushkevich (DKR) isotherms applied in this study. The adsorption data follow the adsorption equilibrium described well by the DKR isotherm model with adsorption energy value (E) ranging from 8,45-11,18 kJ/mol. It was explained that ion exchange described as mechanism for adsorption of Cd2+ onto HAp.Keywords: adsorption, cadmium (Cd), equilibrium model, hydroxyapatite
Pembuatan Batubata Dengan Penambahan Campuran Fly Ash Dan Semen Tanpa Proses Pembakaran Evevndi, Zulfan; Fadli, Ahmad; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Brick is one of material construction which have many application in making material building. The purpose of this research is to study the effect of fly ash addition and hardening time on mechanic characteristic of brick produced. Brick is formed by mixing cement, clay, water and fly ash with adding 0;0,3;0,6;0,9;1,2 kg weight. Brick formed let under room temperature for 7, 14 and 21 day long. The brick quality was measured from its compressive strength, porosity and it’s leached value . The compressive strength test showed that 0,6 kg fly ash addition that dry for 21 day was the the strongest where it’s value was 9,375 N/mm2. It was also found that porosity value getting higher for fly ash addition up to 0,6 kg weight. The highest porosity was 21,34 % found in 1,2 fly ash addition. The result of TCLP test shows that for Pb, Cu, Cr content is still below the quality standards based on PP No.85 TH 1999 and is still considered harmless. leachate value for Pb was 3,10 mg/L, 1,213 mg/L for Cr and 4,374 mg/L for Cu.Keyword : brick, fly ash, compressive strength, porosity, TCLP
Pembuatan Microcarrier Berbahan Baku Hidroksiapatit Menggunakan Metode Protein Foaming-Starch Consolidation pertiwi, Megawati Dwi; Fadli, Ahmad; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Macroporoous microcarrier is one of tissue engineering technology that consist of support matrix and can be used as a cell culture medium in bioreactor. Protein foaming-starch consolidation method is choosed for manufacturing porous hydroxyapatite with egg yolk as a pore-forming agent. The purpose of this study was to determined the effect of yolk addition, sintering temperature, and drying temperature on the physical, chemical and mechanical properties of porous hydroxyapatite made by protein foaming-starch consolidation method. This research was begun with mixing the hydroxyapatite powder, starch, Darvan 821A and yolk. S;urry was stirred mechanically in speed of 150 rpm for 3 hours. Slurry was poured in mold and heated in oven with the temperature of 180ºC for an hour. Then sample was released from mold and burnt at 600ºC ended by sintering at 1250ºC for an hour. The experimental resulted porous hydroxyapatite with average pore size differs from 13.7-17.9 μm, degree of porosity 59.3-63.6 % and compressive strength 5.17-8.2 MPa.Keywords: hydroxyapatite, microcarrier, protein foaming-starch consolidation
Pemanfaatan Limbah Abu Terbang (Fly Ash) Batubara Sebagai Bahan Pembuatan Beton Geopolimer Yuanda, Dedi; Fadli, Ahmad; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Fly ash has a high content of silica and alumina that potential as a subtitute of portland cement. In this study fly ash is utilized for making geopolimer concrete materials. The geopolymer was sinthesized from fly ash Paiton Power Plant using 8 ,10, 12 and 14 NaOH solution and Na-silicate/NaOH. Na-silicate/NaOH ratio used in this study were 0,8;1,2;1,6;2,0. and 80oC for curing temperature. The geopolymer were test in porosity, compressive strength, leached value and it’s morphology. The compressive strength test showed that 14 NaOH solution and 2.0 Na-silicate/NaOH weight ratio were the strongest. It’s value was 7.56 MPa and it’s porosity was 0,0249. It was also found that the compressive strength increases with the composition of NaOH solution and Na-silicate/NaOH weight ratio. The result of TCLP test shows that for Pb, Cu, Cr are still below the quality standards based on PP No.85 TH 1999 and is still considered harmless.Keywords: geopolymer concrete;fly ash; NaOH solution; leached
Pemanfaatan Abu Terbang Batu Bara (Fly Ash) Sebagai Bahan Batako Yang Ramah Lingkungan L, Arif Hamidi; Aman, Aman; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
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Abstract

The use of coal as fuel in industry gives rise to waste such as fly ash and bottom ash. Fly ash has high content of silica and alumina thus can be potentially utilized as construction materials. Fly ash also contains heavy metals of 8.95 ppm Pb , 5.375 ppm Cu and 7.798 ppm Cr. Disposal of this waste in the ash lagoon or stacked inside the industrial area poses a problem for the environment. In this study, fly ash is utilized as raw material for making brick with cement composition to sand ratio 1:6 and replacement of sand by weight of fly ash with variation of 10 , 20 , 30 , 40 % . Compressive strength and leaching test were conducted after 28 days. The result of compressive strenght test showed that block with a variation of 0 % fly ash produces compressive strength of 115 kg/cm2 , 10 % of 155 kg/cm2 , 20 % of 120 kg/cm2 , 30 % of 120 kg/cm2 , 40 % at 95 kg/cm2. TCLP test results showed that most of the heavy metal content of Pb , Cu and Cr are immobilized so well that fly ash can be used as a mixture of brick that are safe for the environment.  Keyword  : fly ash, soldifikasi, batako
Pengaruh Kecepatan Pengadukan Dan Waktu Proses Deasetilasi Kitin Dari Cangkang Kepiting (Portunus Pelagicus) Terhadap Karakteristik Kitosan Ardiansyah, M. Frendy; Drastinawati, Drastinawati; Yusnimar, Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Chitosan syntesized from chitin that isolated from crab shell wastes (Portunus pelagicus). Chitosan synthesized from Chitin that isolated from crab shell wastes (Portunus pelagicus) by deacetylation process. The purpose of this research tostudy the effect of the time reaction of the stirring speed in the deacetylation process. Crab Shell in the puree with a size 100 mesh. Chitin in the crab shell powder are in isolation by process deproteination and demineralization. Chitinwhich has been syntesized and then transformed into chitosan by deacetylation process with NaOH 60%, the mass ratio chitin and NaOH 60% volume 1 : 20 (w/v), at 120˚C, stirring speed 50 rpm, 100 rpm, 200 rpm, and time reaction 60 minutes,120 minutes, 180 minutes. The results showed that the degree of deacetylation and moisture content are increased during reaction time and speed stirring increasing. The Value of yield, moisture content, and degree of deacetylation respectively ranged from 53,6%-83%, 18%-70%, 36%-70%. Chitosan with the highest value of degree of deacetylation is obtained in the reaction time of 180 minutes and stirring speed of 200 rpm with the value of degree of deacetylation is 83%, the value of yield is 69%, the moisture content is 70%, and the ash content is 10,9%.Keywords: Chitin, Chitosan, Deacetylation Process, Degree of Deacetylation, Crab Shell, Characterization.
Pendekatan Shrinking Core Model (SCM) Pada Reaksi Deasetilasi Kitin Menjadi Kitosan Dari Limbah Cangkang Kepiting S, Muhammad Rizki; Drastinawati, Drastinawati; Yusnimar, Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Chitosan is a derivative of chitin compounds used in the biomedical field. The purpose of this research was to determine the effect of mixing speed on the degree of deacetylation of chitosan produced and can describe the reaction kinetics model with the Shrinking Core Model (SCM) approached. The procedure of research begins with the preparation of crab shells. Then crab shells were deproteinated with 3.5% NaOH, ratio 1:10 (b/v) for 2 hours and mixing speed by 150 rpm. After process of deproteinization, then demineralization with 1 N HCl, 1:15 (b / v) ratio for 1 hour and mixing speed of 150 rpm were carried out. The results of demineralization were chitin, then chitin was deacetylated with 55% NaOH, ratio 1:20 (b / v) at 120°C by varying the mixing speed by 100 rpm, 150 rpm and 200 rpm for 3 hours. Samples were taken every 15 minutes and increments of 10 mL, washed to neutral pH and dried. The degree of deacetylation of chitosan was analyzed by using the acid base titration method. The results showed that mixing speed was increased, the degree of deacetylation of chitosan also increased, each variation was 68,38%; 82,92% and 85,62%. The reaction kinetics model that was suitable for describing events that occur in chitosan synthesis were model 1, called diffusion through liquid film control. Keywords: crab shell, chitosan, degree of deacetylation, shrinking core model
Pembuatan Bioetanol Dari Fermentasi Nira Aren (Arenga Pinnata) Menggunakan Yeast Saccharomyces Cerevisiae Dengan Pengaruh Variasi Konsentrasi Nutrisi Dan Waktu Fermentasi Akhir, Yaumil Mutia; Chairul, Chairul; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
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Bioetanol is one of the environmental friendly biofuel and produced by fermentating it with organic primary resource. Biofuel comes from organic resources called non-fossil energy. One of the most potential feed stock which used as primary resource of making bioetanol is arenga plant. Arenga plant is one of the plant that has sugar content. Microorganism that used for processing the arenga plant into bioetanol was Saccharomyces cerevisiae. The step of this research consist of materials and inoculum preparation, fermentation and also analysis. This research was observed the effect of variation in nutrient concentration and fermentation time. Nutrition used in this research were (NH2)2CO (urea) dan NH4H2PO4 (NPK) where urea was varied into 0,3;0,4;0,5; dan 0,6 g/l whereas NPK was varied into 0,4;0,5;0,6; and 0,7 g/l. Fermentation result were taken after 24, 48, 72 and 96 hours. Optimum urea addition result 0,5 g/l and 0,6 g/l for NPK on 72 hours of fermentation that resulting bioetanol concentration 7% (v/v).Keyword : Arenga plant, bioetanol, fermentation, Saccharomyces cerevisiae.
Pengaruh Jenis Pengaduk Dan Waktu Fermentasi Pada Pembuatan Bioetanol Dari Sari Nenas Reject Junuansyah, Muh Wawan; Chairul, Chairul; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Bioethanol is a liquid of fermentation of sugars from carbohydrate source that uses the help of microorganisms. Bioethanol is an energy source with good prospects as a substitute for liquid fuels renewable raw materials, friendly to the environment and the very favorable economic terms. One of the materials that can be used as raw material for bioethanol is pineapple. The fermentation process is influenced by several factors, among which the fermentation time and stirring in a liquid medium. Flow pattern and degree of turbulence is an important aspect which affects the quality of mixing that depends on several factors such as tank geometry, physical properties of fluids and type of impeller. Fermentation time very big influence on the activity of yeast because the longer the fermentation, the more number of increasingly active yeast or yeast to proliferate. The process of fermentation using yeast Sacharomyces cereviceae. Preparation starter made with yeast inoculum process Sacharomyces cereviceae at 10% glucose so that the yeast to multiply. Fermentation takes place in batch, variations in the type of agitator Paddle, pitched Blade Turbine, Turbine Disk and variations in the fermentation time 24, 36, 48, 60 and 72 hours. Stirring speed of 200 rpm and the temperature of fermentation in temperature. Ethanol concentration was analyzed using Alkoholmeter. The optimum fermentation process is shown on the type of agitator pitched Turbine Blade fermentation time of 48 hours with the acquisition of bioethanol concentration of 8.5% (v / v).Keywords : Bioethanol, Reject Pineapple, Saccharomyces Cerevisie, Impeller Type, Flow Pattern
Pemanfaatan Fly Ash Batu Bara Sebagai Adsorben Logam Berat Ion Pb2+ Yang Terlarut Dalam Air Fauzan, Ananda; Aman, Aman; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
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Utilization of coal into an energy source, resulting in another effectare pollution, such as fly ash generated from burning coal. For that, we need an alternative to overcome this problemis by using fly ash as an adsorbent to adsorb heavy metals lead (Pb 2+) are dissolved in water through adsorption process. This study aimed to calculate the amount of adsorbate (Pb 2+)are adsorbed by the fly ash with mevariasikan adsorbate concentration (Pb 2+) and stirring speed to determine the equilibrium models. The use of fly ash adsorption of 1 g, the sample solution (Pb 2+) on the variation of the concentration of 3, 7, 11 mg/l and variation of stirring speed of 100 rpm and 130 rpm. Solution (Pb 2+) have been obtained and analyzed using AAS, diketahi that the higher the stirring speed jerap capacity fly ash adsorbent (Qe) so that the smaller the amount of adsorbate (Pb) are adsorbed on the wane. In the stirring speed of 100rpm and 130 rpm Qe value is 0.585 mg/g and 0.55 mg/g. Mechanisms of Pb adsorption by fly ash is dominated by the Freundlich isotherm models that represent physical adsorption,where Pb adsorbed by the active site of the fly ash with the influence of the van der walls.Keyword :Fly ash, Adsorbate (Pb 2+)
Co-Authors Ahmad Fadli Al'farisi, Cory Dian Alfajar, Fariz Alfarisi, Cory Dian Aman Aman Ardiansyah, M. Frendy Arif Hamidi L Az Zahra, Alya Chairul Chairul Darmiyati, Siti Delef, Fahrul Fajar Desi Heltina Evevndi, Zulfan Fauzan, Ananda Febrina Dwi Putri, Febrina Dwi Fifiyana, Rahma Ida Zahrina Khairat, Khairat Muh Wawan Junuansyah, Muh Wawan Mutamima, Anisa Nisa, Aidina Fahrun Nurfatihayati pertiwi, Megawati Dwi Putra, Eden S, Muhammad Rizki Siahaan, Daniel Andica Silvia Reni Yenti Syamsu Herman Utami, Anggia Afza Yaumil Mutia Akhir, Yaumil Mutia Yelmida Azis Yuanda, Dedi Yusnimar Sahan Yusra, Arif Zuchra Helwani, Zuchra Zultiniar, Zultiniar