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Irdoni Irdoni
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Pembuatan Bioetanol Dari Nira Nipah Dengan Penambahan Tween 80 Dan Ergosterol Pada Proses Fermentasi Menggunakan Sacharomyces Cereviceae Mohammad Rezky; Chairul Chairul; Irdoni Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Nypah  sap is one of potential materials  it’s  processed into bioethanol. Availability of nypah palm land in Indonesia and a fairly high sugar content (15-20%) makes nipa sap has the potential  it’s processed into bioethanol. Ergosterol is an essetial component of yeast cells that maintains the integrity of the membrane. It’s  invetigated as an important factor the ethanol tolerance of yeast cells. Ethanol and hypoxia were found to have negative and synergistic effects on the total ergosterol contents of both strains and  it’s  significantly reduce the free ergosterol. Effect of a surfactant Tween 80 on the bacterial for growth, increase the glucose consumption rate at the later stage of the fermentation, maintain the intact structure of  yeast S. Cereviceae.  Preparation  started  by the  yeast S. Cereviceae inoculum in the 10% of fermentation medium so that yeast an  able to  adapt and ready for fermentation.  Fermentation  place  taked in batches with  volume of 2  liters  of fermentation medium, variations in the tween 80 and ergosterol and variations of fermentation at time 24, 36, 48, 60 dan 72 hours and then concentration of yeast 4 g/l. The stirring speed in 200 rpm and  temperature of fermentation at room temperature (25-300 C)it’s  selected conditions. Bioethanol concentrations has been analyzed by used  gas kromatografi. The process of fermentation optimum conditions indicated in the addition of tween 80 10 ml and ergosterol 1 gram    at the time of 72  hours having the initial sugar concentration of 161,81  mg/ml. concentration Bioethanol obtained in this condition at 20,47% (v/v). Keywords: Ergosterol, Nipa sap, Saccharomyces cerevisiae, Tween 80.
Sintesis Bio-Pelumas Dari Minyak Limbah Ikan Patin Pada Pengaruh Rasio Mol Dan Waktu Reaksi Noferi Yanli; Irdoni Irdoni; Nirwana Nirwana
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
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Bio-lubricant synthesis from catfish waste oil is purposed to modify the useless oil to be a bio-lubricant. That function’s is to protect the engine component from wear. Esterification with ethylene glycol toward acid from catfish waste oil hydrolysis with mole ratio 1:4 for 4 hours, with variation of temperature and mixing speed. The waste extracted by rendering, oil’s boiling point is 270oC, the viscosity is 15,69 mPa s. The oil hydrolyzed at 80 oC with adding of HCl concentrated catalyst 0,1% weight/weight for 8 hours and produce the acid. That’s polymerized by adding benzoyl peroxide as 0,2% for 5 hours at 120 oC. Then, polyestherification by adding ethylene glycol in mole ratios of 1:4, for 4 hours at 120 oC, 150 oC, 1800C, and mixing speed at 150 rpm, 180 rpm, and 210 rpm. The resulting has its density, it’s 0,942 gr/m, viscosity is 61,081 mPa.s, flame point is 290,5oC, boiling point is 290 oC with yield of 66,5%. The product has a commercial standard (density is 0,92 gr/ml and viscosity is >41,1 mPa.s). The best result from this research was obtained by mole ratio 1:4 for 4 hours; the mixing speed is 150 rpm at 150oC.Keywords: bio-lubricants, waste oil catfish
Modifikasi Bioplastik Berbasis Pati-Polivinil Alkohol (PVA) Dengan Cross-Linking Agent Asam Sitrat Dan Pemplastis Gliserol Herlili Peronika; Bahruddin Bahruddin; Irdoni Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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Bioplastic characteristics are influenced by various parameters, including levels of cross linking agents (such as citric acid) and plasticizers (such as glycerol). The research was to study the effect of citric acid and glycerol levels on mechanical properties, cross linking (characterized by ester groups), and biodegradation of bioplastics based starch-polyvinyl alcohol (PVA). Bioplastic manufacturing is done by mixing sago starch -PVA (1: 3), glycerol (10, 15, 20% w/w) and citric acid (2.5; 5; 7.5% w/w) at 90ºC for 45°C minutes, optimization of process conditions is determined by response surface methodology (RSM). The parameters tested include tensile strength test, elongation, and biodegradation. The most significant factor affecting all responses was the level of citric acid and glycerol. The optimum process conditions were obtained at 7.5% w / citric acid content and glycerol 19.63% w / w with a tensile strength response of 21 MPa, elongation 566.6%, and 55.63% biodegradation. Keywords: bioplastics, citrid acid, glycerol, polyvinyl alcohol, RSM, sago starch
Transesterifikasi Minyak Limbah Ikan Patin Menggunakan Isobutanol Dengan Variasi Jumlah Katalis Dan Waktu Reaksi Risky Deliana; Nirwana Nirwana; Irdoni Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
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Plastisizer is an organic solvent with high boiling point. As a solid, its melting point is considerably low.  Plastisizer is produced from process called transesterification. It is a reaction between oil (ester) and alcohol, creating new esters and glycerol as it’s by products. This experiment used waste of Pangasius sutchi oil, isobutanol, and H-Zeolit. The transesterification is performed in a reactor equipped with mixer. Independent variables were set prior to the study, consists of molar ratio 1:6,  mixer velocity 175 rpm, and temperature of 90° C. While the dependent variables are reaction rate of 5, 6, and 7 hours, and catalyst amount 10%, 15%, and 20% of oil weight. This experiment resulted in plastisizer with similar characteristics to commercial plastisizer in  specific gravity, viscosity, except saponification value. Furthermore, at reaction rate 6 hours and catalyst amount of 15 %, the conversion of 18,03%. Keywords: H-Zeolit, Isobutanol, Plastisizer, Transesterification
Sintesis Biopelumas Dari Minyak Biji Jarak: Pengaruh Kecepatan Pengadukan Dan Suhu Reaksi Nico Gunawan; Irdoni Irdoni; Nirwana Nirwana
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Lubricants is an inseparable part of machine. Lubricants used to protect engine components from worn-out. Along with the increasing demands on materials that are environmentallyfriendly and renewable, vegetable oils or animal fats based biolubricants can be claimed as a solution. Jatropha curcas oil is an oil that can not be consumed cause had phorbol ester andkurkin that are toxicthus potentially used as raw material for biolubricants. This research purposes to study the synthesis of biolubricants from castor oil to observe the effect of stirring speed and esterification reaction temperature. The research was begun with the saponification of jatropha curcas oil to make fatty acid. Furthermore, fatty acids will be esterified with etylen glycol ona mole ratio of 1: 4, and time reaction for 4 hours, stirringspeed 150, 180, 210 rpm, and the reaction temperature of 120oC, 150oC, and 180oC. The yield raised with the increase of stirring speed and reaction temperature. Temperature influence is more significant than the speed of stirring. The highest yield is 91,96% at reaction temperature at 180 C and a stirring speed of 180 rpm with a flash point 435°C, pour point 4°C, density 0,9005 g/ml and viscosity index amounted 161,678.Keywords: biolubricants, esterification, etylen glycol, jatropha curcas oil, yield
Pembuatan Trikalsium Fosfat Berpori Menggunakan Metode Protein Foaming-Starch Consolidation Dengan Variasi Penambahan Jumlah TCP Dalam Slurry Dan Kecepatan Pengadukan Lia Yuningsih; Ahmad Fadli; Irdoni Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
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Tricalcium phosphate (TCP) has been widely used as a bone substitute material and teeth because it is biocompatible and similar to the mineral structure of human bone. Porous Tricalcium phosphate (TCP) was made by protein foaming-starch consolidation method by using egg white as a pore-forming agent and starch like sago flour as the consolidator. The purpose of this research is to study the effect of stirring rate and addition of TCP in slurry on the physical, chemical and mechanical properties of porous TCP. This research was began by mixing TCP, egg whites, starch and Darvan 821 A by certain composition and then stirred for 3 hours with stirring rate of 100.150 and 200 rpm. The slurry was poured into a mold and dried in an oven at 180oC for 1 hour. Then the samples removed from the mold to produce green bodies. Afterthat, the green bodies were burned at 600 oC and followed by sintering at 1100oC with rate of 2oC/min for 2 hours. This research result shows the porosity of porous TCP bodies increased with increasing stirring rate, but the compressive strength decreased. The addition of TCP in the body was found to increase the compressive strength when the porosity decreased . The TCP with a porosity of 66.67 to 72.77 % and 0,75 to 1,08 MPa compressive strength were found at stirring rate of 100 rpm. Meanwhile, the stirring rate of 200 rpm, the TCP has a porosity from 68,13 to 76,92% obtained 0.68 to 1 MPa compressive strength. Keyword : compressive strength, egg white, porosity,tricalcium phosphate
Sintesis Biopelumas Dari Minyak Biji Karet : Pengaruh Rasio Molar Antara Etilen Glikol Dan Asam Lemak Serta Waktu Reaksi Esterifikasi Terhadap Yield Biopelumas Fenny Lasma Hilde S; Irdoni Irdoni; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Lubricants used to protect engine components from worn-out. Rubber seed oil is an oil that can not be consumed cause toxicthus potentially used as raw material for biolubricants. This research purposes to study the synthesis of biolubricants from rubber seed oil to observe the effect of rasio mol between fatty acid and time of esterification reaction to the yield of the product. The research was begun with the extraction of rubber seed to get the oil. Then, the oil was degumming to purify the oil from the gum. Next, the oil was hydrolysis to make fatty acid and glycerol. Furthermore, fatty acids will be esterified with etylen glycol on a mole ratio of 3:1, 6:1 and 9:1, and time reaction for 2,3 and 4 hours, stirring speed 180 rpm, and the reaction temperature is 150 oC. The yield raised with the increase of fatty acid rasio mol and time of reaction. The highest yield is 79,772 % at 4 hours time of reaction with 9:1 rasio mol fatty acid and etylene glycol at stirring speed of 180 rpm. Flash point of the biolubricant is 387°C, pour point 7°C, density 0,9143 g/ml and viscosity index amounted 162,329.Keywords: biolubricants, esterification, etylen glycol, rubber seed oil, yield
Sintesis Hidroksiapatit Dari Cangkang Telur Dengan Metode Presipitasi Novika Sri Wardani; Ahmad Fadli; Irdoni Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
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Hydroxyapatite powder from eggshell waste as biomaterial has been succesfully synthesized using precipitation method with variation of ratio Ca/P and reaction temperature. High incidence of bone destruction in Indonesia led to an increased need for biomaterials as bone substitute forexample is HAp. The purpose of this study is to assess the effect of the molar ratio of Ca / P and the temperature reaction to hydroxyapatite and characterization of eggshells using AAS and products with XRD, SEM – EDX, and FTIR. Eggshell was calcined at temperature 1000°C to produce calcium oxide (CaO). CaO dissolved in nitric acid (HNO3) to produce Ca(NO3)2 then mixed gently with diammonium hydrogen phosphate was dissolved into aquabidest . HAp produced has ratio Ca/P <1,67. Absorption band of OH-, CO32-, and PO43- groups indicate HAp compounds, but it also contained carbonated hydroxyapatite (CHAp) and tricalcium phosphate (TCP) group. The morphology of HAp particle have a granular shape. The particle size of HAp is getting smaller with increasing the ratio of Ca/P in the range of 69-53 nm and greater with increasing reaction temperature which ranges from 39-47 nm.                                                                 Keywords : Calcination, eggshell, Hydroxyapatite, precipitation
Sintesis Bioplastik Berbahan Dasar Pati Jagung Dengan Penambahan Filler Selulosa Serat Daun Nanas (Ananas cosmosus) Angga Dwina Putra; Idral Amri; Irdoni Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Conventional plastic waste is one of the most worrying issues for the environment because it can not be degraded by microorganisms. Bioplastic or biodegradable plastic is one of alternative solution to change conventional plastic, because bioplastics are easy to degrade. One of the potential materials to become the raw materials is corn starch and pineapple leaf fiber cellulose because it has high starch and hight cellulose. The general purpose of this research are to determine the impact and the best composition of the addition cellulose and glycerol in mechanical properties of bioplastic. The synthesis method is casting of corn starch, cellulose, and glycerol with composition of plasticizer is (0,5-1,5 gr) and composition of filler is (10–25 % b/b starch). The analysis of bioplastic was tensile strenght, elongation, modulus young, water uptake, biodegradation, and Scanning Electron Microscopy (SEM). The most significant factor of all responses was composition of filler cellulose and composition of plasticizer gliserol. The best process condition was bioplastic with composition of filler 25% b/b starch and plasticizer 0,5 gram with the value of tensile strength 17,11 MPa, elongation 4,345%, modulus young 393,786 MPa, water uptake 20,37% and biodegradation 27,78%. Scanning Electron Microscopy (SEM) analysis shows that filler distribution was not equal on corn starch matrices and still has a clod.Keywords : bioplastic, biodegradable, cellulose, filler, plasticizer
Pengaruh Nisbah Dan Suhu Pencampuran Terhadap Sifat Campuran Aspal – Crumb Rubber Desi Purnama Sari; Irdoni Irdoni; Bahruddin Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
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Modified asphalt is one of the alternative to method the road problems in Indonesia. This experiment aims to determine the effect of mixing ratio and temperature towards the property of asphalt - crumb rubber. This research method conducted by varied ratio 5%, 8% and 10% of melted crumb rubber. Then, mixsed with melt asphalt. The temperature variation of this process were at 150 oC and 170 oC for 60 minutes. The softening point, penetration, marshall stability and loss weight were tested from the modified asphalt. The results of this study indicated that the modified asphalt with crumb rubber has increased the value of softening point, penetration, stability marshall and decrease the loss weight. The best results was at 150 oC with 10% of crumb rubber, which has the softening point at 52 oC, penetration at 74.1 mm, marshal stability 1266.7 kg and loss weight 0.017%.Keywords : asphalt modified, crumb rubber, mixing ratio, penetration, stability marshall
Co-Authors Abd. Rasyid Syamsuri Ahmad Fadli Andri Mulia Angelina Debbie Angga Dwina Putra Bahruddin Chairul Chairul DESI PURNAMA SARI Edy Saputra Fenny Lasma Hilde S Herlili Peronika Ibnu Oktariza Idral Amri Lia Yuningsih Liendra Juniarti Marihot Danield Vyendri Simatupang Melly Anggraeni Mohammad Rezky Muhammad Isra Nico Gunawan Nirwana Nirwana Noferi Yanli Novika Sri Wardani Randi Farlindo Risky Deliana Rizky Sandy Harahap Roy Marthin Panjaitan Septiani Lestari Silvia Rahmi Suhendri Suhendri Susilawati Susilawati SYAIFUL BAHRI Syarfi Syarfi Wahyu Suci Rahmani Wan Elsa Novtari Adiani Yanny Sartika Yelmida Azis Yusnila Halawa