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All Journal Jurnal Sains dan Teknologi Komunikasi Fisika Indonesia Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Riset Kimia Jurnal Ilmiah Biosaintropis (Bioscience-Tropic) Jurnal Ilmiah Pertanian Science and Technology Indonesia Martabe : Jurnal Pengabdian Kepada Masyarakat Stannum : Jurnal Sains dan Terapan Kimia Jurnal Pengabdian Masyarakat Teknik Indonesian Journal of Chemical Science and Technology Journal of Applied Materials and Technology Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Journal of Bioprocess Chemical and Environmental Engineering Science Jurnal Abdi Masyarakat Indonesia Journal of Community Engagement Research for Sustainability Komunita: Jurnal Pengabdian dan Pemberdayaan Masyarakat Jurnal Sains Materi Indonesia JURNAL REKAYASA KIMIA & LINGKUNGAN
Yelmida Azis
Department Of Chemical Engineering, Faculty Of Engineering, Universitas Riau
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Pembuatan Nitroselulosa Dari Selulosa Hasil Pemurnian Pelepah Sawit dengan Hidrogen Peroksida (H2O2) Sebagai Bahan Baku Pembuatan Propelan Saragih E; Padil Padil; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Nitrocellulose is a polymer used as materials for propellant. Manufacture of nitrocellulose done with cellulose nitration process. Nitration of cellulose is a reaction force substitution or replacement of H+ from –OH- groups in cellulose contained in the NO2+ cluster of nitric acid (HNO3). Cellulose to be used is sourced from waste palm midrib. The purpose of this study is to obtain the best conditions of temperature and time nitration that α- cellulose nitration process to produce nitrocellulose with a high nitrogen content. Palm midrib cellulose purified before entering the nitration process. Stages of the purification process a palm midrib cellulose is extraction, hydrolysis, delignification and purification with hydrogen peroxide (H2O2). After the purification process, the next step is the process of nitration of cellulose with a mixture of nitric acid and sulfuric acid. Nitration process is done with the variation of temperature and reaction time. Nitrocellulose nitrogen levels will be analyzed with Fourier Transform Infra Red Spectroscopy (FTIR). The best conditions in the nitration process took 30 minutes with the temperature of 90 oC. Nitrogen levels were estimated on nitrocellulose > 12% so it can be used as raw material for the manufacture of propellants. Keywords: FTIR, Nitration, Nitrocellulose, Palm Midrib, Propellants
Pengaruh Waktu Dan Suhu Reaksi Grafting Pada Proses Pembuatan Maleated Natural Rubber Ade Putra; Yelmida Yelmida; Bahruddin Bahruddin
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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Abstract

Natural rubber can be modified through the grafting process. of maleic anhydride (MAH). Maleic anhydrade has been grafted into natural rubber to make a compound called Maleated Natural Rubber (MNR). The aiming in this research is learning of the reaction time effect and the temperature of natural rubber grafting process. Furthermore,kinetics reaction of the grafting process has to be learned. Independent variables are 8 phr of MAH and 60 rpm rotor speed of internal mixer. Dependent variables are reaction temperature and reaction time, which are variated by 150oC, 155oC, 160oC, and 165 of reaction temperature, and 6, 8, 10, 12, 14 minutes of reaction time. The degree of grafting was determined by titrimetric method, meanwhile kinetics reaction is learned by assumption of pseudo - first order to get the value of the constant rate of reaction (k). The results showed the optimum temperature is 160oC  and reaction time is 12 minutes. Best conditions of the kinetics reaction has been obtained at reaction temperature 155o and 165oC, which produced constant rate of reaction is 0.004 min - 1, activation energy is 6107 cal / mo , hereby  the Arrhenius equation : k = 4,65 e-6071/RT  Keywords: grafting degree, maleic anhydric, maleated natural rubber, temperature, Arrhenius equation.
Sintesis Surfaktan Metil Ester Sulfonat (MES) Dari Palm Oil Metyhl Ester (POME) Dan Natrium Bisulfit (NaHSO3) Dengan Variasi Suhu Sulfonasi Dan Rasio Mol Pome : NaHSO3 Yuliatmi Yuliatmi; Syaiful Bahri; Yelmida Yelmida
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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Methyl Ester Sulfonate (MES) is an anionic surfactant which is currently being developed. These surfactants can be produced from palm oil methyl ester. MES produced from sulfonation reaction with addition of sulfonation agents. MES can be synthesized from Palm Oil Methyl Ester (POME) and Sodium Bisulfite (NaHSO3) as the sulfonation agent with Calcium Oxide as the catalyst. The aims of this research are to determine the characteristic of the product, and to determine the effects of temperature and mole ratio of the product produced. Sulfonation process was carry out at the temperature of 80, 100, 120°C, the mole ratio of 1:1, 1:1,5, 1:2, the stirring speed of 450 rpm, and the time of 6 hours. Then purification of the MES surfactant and product analysis is carried out. The best characteristic of the MES is at temperature 100°C and mole ratio 1:2 with the density of 0,860 gr/ml, the viscosity of 1,966 cP, the pH of 3,53, the surface tension of 37,45 dyne/cm, the interfacial tension of 26,3 dyne/cm, the emulsion stability of 89%, and the yield of 83,25%.The surface tension is accordance to the commercial MES.Keyword : MES, POME, Sulfonation, Surfactant, Surface Tension.
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (Pcc) Cangkang Telur Itik Melalui Proses Hidrotermal Dengan Variasi Ph Dan Waktu Reaksi Miftah Anugrah; Yelmida Azis; Ahmad Fadli
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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Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is one of the calcium phosphate compounds, which is the main inorganic component of human’s hard tissue such as bones and teeth. Hydroxyapatite (HAp) is a material used as an implant, adsorbent, and catalyst. The purpose of this study were to obtained product of hydroxyapatite from duck egg shell, studied the effect of variations in pH and reaction time on diameter of crystals and degree crystallinity of hydroxyapatite, and obtained the optimum conditions based on variations given. In this study, duck egg shell PCC and (NH4)2HPO4 were reacted using hydrothermal vessels with variations in pH of reactants at 8, 9, 10, 11, and 12, reaction time 15 and 16 hours, ratio of Ca/P 1,77 and HAp being synthesized at 140oC. The results were analyzed using X-Ray Diffractometer (XRD), Scanning Electron Microscopy (SEM-EDX), and Brunaeur-Emmet-Teller (BET). The result shows, the best hydroxyapatite were obtained at 15 hours of reaction time and pH 12 with diameter of crystals 26,91 nm, crystallinity 74,28%, ratio of Ca/P 1,60, and surface area 30,017 m²/g.Keywords: Hydroxyapatite, Hydrothermal, Crystallinity, PCC
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
Pengaruh Gelombang Mikro Pada Pretreatment Tongkol Jagung Menjadi Bioetanol Imron Sutiono; Chairul Chairul; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Oil production is predicted  decreasing until 20 billion barrels in  2050. The decreasing of oil production will cause efforts to find alternative renewable and   friendly source energy. The one of alternative energy is bioetanol that produced from biomass waste. The Micro wace radiation will give to corn cob as a pretreatment process in this research. Micro wave is expected to break lignin structure in order to get the optimum of etanol. The purpose of the research is to know the effect of micro wave in the pretreatment of corn cob. The corn cob will radiate  on 180 watt through micro wave  with time variation 2,4,6,8 dan 10 minutes, then continued with hidrolisis process using dilute H2SO4 and fermentation process using Saccharomyces cerevisiae. The result of fermentation will analyzed  with Guymon method by using alcoholmeter. The results indicate the highest concentration of bioetanol that  get  from this fermentation process up to 2,5% (25g/l) during 24 hours for the variation micro wave radiation in 6 minutes. The optimum Yield of bioetanol up to 23,67%. The longer time fermentation process and the longer radiation of microwave that is done in this research show that there is no increasing the concentration of bioetanol that we get.  Key word : bioetanol. Microwave, corn cob, Saccharomyces Cerevisiae
Proses Pemurnian Selulosa Pelepah Sawit Sebagai Bahan Baku Nitrolesulosa Dengan Variasi pH Dan Konsentrasi H2O2 Rianto Harpendi; Padil Padil; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
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Abstract

One of the raw materials for propellant or explosive double base type is nitrocellulose. Availability of cellulose which is the main component of biomass is very abundant in Indonesia, particularly solid waste palm oil industry. With cellulose content of 34.89%, palm midrib is one solid waste palm with potential to be used as the main raw material cellulose. Purity cellulose levels that must be achieved to produce nitrocellulose propellant as raw material is more than 92%. So as to improve the purity of the cellulose in the palm midrib must be purified using hydrogen peroxide, which is initiated by the hydrolysis with EFB ash extract. Hydrogen peroxide is a chemical that can be used for the bleaching process, because this compound is more environmentally friendly than chlorine. The purpose of this is to obtain the best conditions to obtain cellulose purity of more than 92%. The bleaching process is done by varying the concentration of hydrogen peroxide (1%, 2%, 3%, 4%, 5%) and pH (8, 9, 10, 11, 12). Pulp composition analysis of purified cellulose. Obtained the best process conditions is the concentration of 3% hydrogen peroxide and pH 9 with 95.11% purity cellulose.  Keywords :  Palm Midrib, Bleaching, Hydrogen Peroxide, Cellulose
Pembuatan Coating Copper-Cobalt Oksida Melalui Proses Sol Gel Dan Dideposisikan Secara Spray Coating Pada Substrat Alumunium Ramadhan Ramadhan; Amun Amri; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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The research aims to synthesis the mixed copper and cobalt oxides coating in alumunium substrate for solar selective absorber (SSA) using sol-gel spray coating method. The coating were characterized using UV-Vis-NIR, X-Ray diffraction, Scan Electron Microscope (SEM) and adhesion test. The sol precursor were copper nitrate and cobalt nitrate. The sol precursor are made by dissolve the granules Cu(NO3)2.3H2O and Co(NO3)2.3H2O into the etanol solvent and added propionate acid. Mix the two solution and then stirred at room temperature for two hours in a closed state. The coating process was done by using a spray gun which is connected by using a compressor. The result of researching showed that sample with precursor concentration 0.25 M and 30 x spraying and drying cycle with (α) = 86.8%. further characteristic was obtained the value of emittance (ε) = 6.64%. The crystal structure of CuCo2O4, CuO and CoCo2O4 were found in XRD result analyst. The result testing of SEM showed that surface coating film relative homogen and the result testing of adhesion showed bond layer of coating categorized as 4B according to the standards ASTM D 3359.Keyword : coating, precursor, sol, solar selective absorber, spray coating
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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Abstract

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 Variasi pH Dan Waktu Pada Pembuatan Bioetanol Dari Sari Kulit Nanas Dengan Menggunakan Zymomonas Mobilis Cece R; Chairul Chairul; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
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Bioethanol is an alternative energy source that has enough potential to replace fossil fuels. Bioethanol can be produced by fermentation of carbohydrate crops . One of the raw materials that can be used is a pineapple peel. Because today is still a waste of pineapple peel untapped. In pineapple peel contained 13.6 % reducing sugar , so as to have good potential to be processed into bioethanol . One way of making bioethanol is by microbial fermentation using Zymomonas mobilis . The fermentation process is influenced by several factors, including pH and time . This study was conducted to determine the optimum pH and time at fermentation process for bioethanol production from pineapple peel juice. The study was conducted by varying the pH of 4.5, 5.0, 5.5 and 6.0 with fermentation time 14 , 23 , 39 , 47 , 65 , and 71 hours using Zymomonas mobilis microbes . Bioethanol yield analysis using a gas chromatograph (GC). The result is the highest ethanol yield was 3.01% at pH 4.5 and fermentation time of 65 hours. Keyword: Bioethanol, zymomonas mobilis, pineapple peel, yield, GC
Co-Authors ', Padil Abd. Rasyid Syamsuri Adam Rafif Aldori Ade Putra Adrian, Melisa Agustiyanti, Rini Dwi Agustiyanti, Rini Dwi Ahmad Fadli Ahmad Fadli Ahmad Fadli Aidil Akbar Aisyah Dewi Ranti, Aisyah Dewi Akbar, Anif Aulia Al'farisi, Cory Dian Alel, Ariya Eka Alfarisi, Cory Alfarisi, Cory Dian Alfarizi, Cory Dian Alltop Amri Ya Habib Alpina, Clara Shinta Asri Al’farisi, Cory Dian Amun Amri Aras Mulyadi Ari Wibowo Harahap Audrya, Helsa Az Zahra, Alya Azriyenni Azhari Zakri Bahruddin Bahruddin Bahruddin Bintoro Bintoro Blesvid, Bloomy Caesari Caesari Cece R Chairul Chairul Chairul Chairul Chandra Marzuki Nababan Citra Arimby Dani Pradana Dedeng Hermoyo Delita, Fuji Dewi, Yuli Piana Dhini Octavianty Dian Novita Rahmawaty Dini Aulia Sari Ermal Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati Edy Saputra Elvi Yenie, Elvi EVELYN EVELYN Evelyn Evelyn Fadli, Deno Febri Fadly Sitohang Fajril Akbar Fajril Akbar Faradila, Harfiah Ferdy Ashari Syawal Getra Anugrah Hadi Ikrima Hadrian Yonas Sebastian Napitupulu Hastuti, Ririn Puji Hazzamy, Muhammad Asyaf Helda Sri Rahayu, Helda Sri Hidayat, Muhammad Ariful Holyness Nurdin Singadimedja Hotni Lamtiar Hutagaol, Nurhidayah I Gusti Bagus Wiksuana Ida Zahrina Idral Amri Ikhma Zurani Imron Sutiono Indah Sri Rahma Ningsih Indra Purnama Irdoni Irdoni Jefry Soclin Sianipar Jenial S Kamarullah, Rahmat Kayabi, Ulhunk Aulia Kendro Prasetyo Khairat, Khairat Komalasari Komalasari Komalasari Komalasari Komalasari Komalasari Komalasari Luckita, Gema Kesa Lucy Rahmawati M Asyraf Hazzamy M. Gherald Erlangga Putra M. Rafi Yunanda M. Yogi Riyantama Isjoni Mahdi, Zamratul Miftah Anugrah Mohd. Rafiq Muhammad Alfin Khairullah Muhammad Ichwan Pradana Muhammad Khairil Amri Muhammad Rahman Muhammad Syafiq Izzuddin Muhammad Yahya Muhammad Yusro Annur Mukhlis Khoirudin, Mukhlis Musbar, Al Swendo Mutamima, Anisa Nurfajriani Nurfajriani Nurfatihayati Nuruzzaman Shiqhi Padil Padil Paul Destin Purba Putri M F Putri, Desi Erika Qalbi, Tiffani R, Yolanda. Rafif Sauqi Rahimah Rahimah Rianto Harpendi Rio Saputra Ristandi, Ristandi Romadona, Syahri Rozanna Sri Irianty Rozanna Sri Irianty Rozanna Sri Irianty Ryan Tito Sanredina Sanredina Saputra, Rio Saragih E Sari D. P Shinta Elystia Siahaan, Daniel Andica Silvia Reni Yenti Sisi Oktadira Kalpatari Siti Rahmalia Sri Hidayanti Sri Murda Niati Sri Rezeki Muria Suhendri Suhendri Suhendri SUNARNO Sunarno Sunarno Syafruddin Syafruddin SYAIFUL BAHRI Syamsu Herman Syelvia Putri Utami Tanjung, Muhamad Adrian Tengku Emrinaldi Toni Arissaputra Utama, Panca Setia Utami Utami Vina Ermalinda Wahyu Lestari Wahyu, Pri Widya Pangestu Wisrayetti Wisrayetti Wisrayetti, Wisrayetti Yeni Kusumawaty Yoanni Marsha Rezki Yoga Deswan Suwary Yolanda, Yogi Yuliatmi Yuliatmi Yunus Olivia Novanto Yunus, Aulia Yusnimar Sahan Zahrina, Zahrina Zakwan Zarkasi, Shoumi Zikri, Ahmed Zuchra Helwani Zuchra Helwani, Zuchra Zultiniar &#039; Zultiniar Zultiniar Zultiniar, Zultiniar Zultiniar, Zultiniar