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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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Efek Temperatur Terhadap Bentuk Partikel Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Kulit Telur Itik Melalui Metode Presipitasi Tanjung, Muhamad Adrian; A, Yelmida; Komalasari, Komalasari
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

Hydroxyapatite (Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate, which is widely used in various medical applications, mainly in orthopedics and dentistry due to it’s similarities with inorganic mineral component of bone and teeth. However, in spite of chemical similarities, mechanical performance of synthetic hydroxyapatite is very poor compared with that of natural bone. It is possible to improve the properties of hydroxyapatite ceramics by controlling important parameters of powder precursors such as particle size, particle shape and agglomeration. Generally, natural or synthesized hydroxyapatite particles have rod-like and spherical-like. Different shapes of hydroxyapatite will affect biological response to human body, and the adaptation of osteoblast with hydroxyapatite. In this work, the synthesis of hydroxyapatite with various shapes has been done succesfully with the aid of precipitation method, by controlling the temperature. Spherical-like hydroxyapatite was synthesized at 30oC, rod-like hydroxyapatite was synthesized at 50oC and 70oC, and needle-like hydroxyapatite was synthesized at 90oC. FTIR analysis showed that the apatite compound has been formed with the absorption of PO4 3- and OH - ion at the wave number 1027.64, 1026.96, and 3301.69 cm-1. XRD analysis showed the similarities with standard hydroxyapatite ICDD 01-074-0566. The degree of crystallinity will be higher as long as temperature increased.Keywords: hydroxyapatite, particle shape, duck eggshells, temperature, precipitation method
Sintesis Biodiesel Dari Palm Fatty Acid Destillate (PFAD) Menggunakan Katalis Cu-Hap Dengan Variasi Kecepatan Pengadukan Dan Waktu Reaksi Putri, Desi Erika; Azis, Yelmida; Alfarisi, Cory Dian
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

This research will shown the effect of stirring velocity and reaction time to biodiesel yield production and determine the physical and chemical characteristics of biodiesel. Palm fatty acid destillate (PFAD) synthesis which is a by-product of cooking oil processing becomes biodiesel through esterification. The esterification was done by mixing PFAD by 25 gram with Cu-HAp catalyst 0.25 gram and 97 ml methanol. Stirring velocity is 250 rpm, 300 rpm and 350 rpm and reaction time variation is 2 hours, 3 hours and 4 hours at 60 ° C. The highest biodiesel yield at 300 rpm stirring speed with a reaction time of 2 h is 63%. For physics characteristic of biodiesel in the form of density are: 0,884 gr/ml - 0,902 gr/ml, viscosity: 4,181 cSt - 5,029 cSt, acid number: 0,553 mg KOH/g oil - 1,661 mg KOH/g oil and calorific value: 9048 - 9813 Kcal / kg produced according to biodiesel standards SNI-04-7182-2006. For the analysis of GC-MS (Gas Chromatography-Mass Spectroscopy) the main compounds found in biodiesel from PFAD are methyl myristate, methyl palmitate, methyl linoleate, methyl oleate and methyl stearate is 78,88%Keywords: Biodiesel, PFAD, Cu-HAp catalyst, esterification.
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Itik Melalui Proses Sol-Gel Dengan Variasi Rasio Reaktan Ca/P Dan Waktu Aging Luckita, Gema Kesa; Azis, Yelmida; Akbar, Fajril
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

Precipitated Calcium Carbonate (PCC) is a product of nature material that contain calcium carbonate, like duck eggshell. PCC producted by precipitation process with high purity. Hydroxyapatite (HAp) is a crystalline molecule composed of phosphorus and calcium with molecular formula is Ca10(PO4)6(OH)2. Hydroxyapatite is a bioceramic which is widely used as bone graft or teeth, catalyst, and adsorbent. This research aims to study the effect of reactant ratio of Ca/P and aging time on synthesized HAp and to find the best condition of reactant ratio of Ca/P and aging time of hydroxyapatite synthesis in this method. In this research, hydroxyapatite was done by sol-gel method through from PCC formation path from duck egg shell which has 99.6% content. The variations given in this research are the reactant ratio of Ca/P (1.67 and 1.77) and aging time ( 16, 20, 24, 28, and 32 hours). The synthesized hydroxyapatite was analyzed by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy – Energy Dispersive X-Ray (SEM-EDX). The result showed that the reactant ratio of Ca/P and aging time has effects on the synthesized hydroxyapatite characteristics. The result of FTIR analysis shows that in each sample there are groups of PO43-, OH-, and CO3- which indicate that apatite compound has been formed. The XRD analysis results show that the synthesized hydroxyapatite has X-Ray pattern and the highest intensity peak at angle of 2θ which is very similar to the standard hydroxyapatite from ICDD data (International Centre of Diffraction Data). The optimum condition of reactant ratio of Ca/P and aging time was obtained at the reactant ratio of Ca/P 1.67 and aging time during 32 hours due to the X-Ray pattern and the highest intensity peak at angle of 2θ very similar to the standard hydroxyapatite and having the smallest diameter than other conditions which is 26.8909 nm. The result of SEM-EDX analysis show the hydroxyapatite morphology in the form of agglomerate with molar ratio of Ca/P 1.57 .Keywords : aging, hydroxyapatite, sol-gel method, PCC, synthesis.
Perengkahan Katalitik Palm Fatty Acid Distillate (PFAD) Menjadi Biofuel Dengan Katalis Abu TKS Variasi Temperatur Dan Berat Katalis Blesvid, Bloomy; Yelmida, Yelmida; Zultiniar, Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
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Abstract

Technology of catalytic cracking process that has been widely used to process petroleum and  now used to process vegetable oil into biofuel. PFAD is a by-product of refining CPO process which has trigleceryde that can be converted into biofuel equivalent with fuel. PFAD cracking using ash palm empty fruit bunches (PEFB) catalyst with variation temperature and weight of catalyst. The purposes of the research is to obtain the operation condition such as the temperature and weight of catalyst to get the highest yield(%), to know the composition of the product, and to know physical properties product such as density, viscosity, and flash point. Weight of catalyst composition was varied from 0,5% to 2,5% wt with temperature range 350oC to 430 oC, rates of agitation 300 rpm, and the flowrate N2 is 150 ml/minute. Composition product analysed by GC- MS and the result is fractions fuel such as gasoline, kerosene, and diesel. The analysed showing that PFAD cracked into gasoline fraction with the highest yield is 54,3%. Key Words: Ash PEFB, biofuel, catalytic cracking, PFAD
Sintesis Dan Karakterisasi Hidroksiapatit (HAp) Dari Kulit Kerang Darah (Anadara Granosa) Dengan Proses Hidrotermal Khoirudin, Mukhlis; Yelmida, Yelmida; Zultiniar, Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Hydroxyapatite Ca10(PO4)6(OH)2 is a material that recently used as a filler and coating for bone and teeth implant. It is used as an implant because it has a good bioactive and biocompatible characteristics. HAp synthesis can be made by using material which is rich of CaCO3 like blood cockle shell (Anadara granosa) (98,7 %). In this research, blood cockle shell whichhas calcium source was synthesized to HAp by hydrothermal process. The size of blood cockle was varied (60, 100, 200 mesh) and reaction duration (16, 20, 24 hours). The outcome of synthesis was characterized by using with FTIR, XRD, SEM-EDX. From FTIR, it showed that hydroxyapatite was formed with the presence of the peak from ion PO43- dan OH. The highest peak was obtained from 200 meshes of particle size for 24 hours. XRD results showed the peaks of hydroxyapatite diffraction pattern with HAp standard at angle 2θ is 10.8322°, 21.7774°, 25.9091°, 28.1308°, 34.1252° with JCPDS hydroxyapatite standard. The form of crystal was hexagonal. SEM-EDX showed the morphology size which was 10µm - 100µm range and 1,99in Ca/p ratio.  Keywords: Blood Cockle Shell,Synthesis,Hydroxyapatite, Hydrothermal Method.
Sintesis Hidroksiapatit dari Precipitated Calcium Carbonate (PCC) Kulit Telur Ayam Melalui Proses Hidrotermal Yahya, Muhammad; Azis, Yelmida; Zultiniar, Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
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Abstract

Hydroxyapatite Ca10(PO4)6(OH)2 is a calcium phosphate compound which is bioactive ceramic material with high bioafinitas and the principal inorganic constituent of bones and teeth. Hydroxyapatite (HAp) materials used as bone implants, adsorbents and catalysts. In this research synthesis of hydroxyapatite can be made by using material which is rich of CaCO3 like PCC chicken’s egg shell with a composition of 99,45% CaCO3. PCC chicken’s egg shell which has calcium source was synthesized to HAp by hydrothermal process with varied of ratio Ca/P (1,57;1,67;1,77) and reaction temperature (140oC, 160oC, 180oC). HAp synthesized result has been analyzed using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The results of FTIR analysis, synthesis of HAp with hydrothermal method through precipitated calcium carbonat (PCC) showed the formation of hydroxyapatite in the presence of peaks PO43- dan OH-. The highest peak is obtained at reaction temperature 140oC with ratio Ca/P 1,57 and reaction temperature 160oC with ratio Ca/P 1,67. XRD diffraction results in hydroxyapatite get the highest purity obtained at temperature of 160oC at ratio 1,67 with a hexagonal crystal structures. The results of SEM-EDX analysis, show that the morphological form of agglomerates or clumping . The molar ratio of Ca/ P of hydroxyapatite which is made from chicken’s egg shell through the PCC is 1,69.Keywords: PCC Chicken’s Eggs Shell, pH, Temperature, Hydroxyapatite, Hydrothermal Method.
Sintesa Precipitated Calcium Carbonate (PCC) Dari Cangkang Kerang Darah ( Anadara Granosa) Dengan Variasi Jenis Asam Dan Waktu Karbonasi Zikri, Ahmed; Amri, Amun; Zultiniar, Zultiniar; Yelmida, Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Abstract

Precipitated Calcium Carbonate (PCC) can be synthesized from blood cockle shell through three methods, namely the method of solvay, soda caustic, and carbonation. The method used in this research that was the carbonation process in the modification, the use of acid solvent during the slaking process to obtain higher yields. The purpose of this research was to synthesize precipitated calcium carbonate (PCC) of blood cockle shell by varying the type of solvent and acid carbonation time. A number of blood cockle shell powder was calcined at 900oC temperature to calcium oxide (CaO) form, then CaO was dissolved into some acid solvents (HNO3, HCl, and CH3COOH). Furthermore, the carbonation process with carbonation time variation 30, 60, and 90 minutes. Based on AAS analysis CaO content in the blood cockle shells was 76.66%, which detected as aragonite crystals. The highest yield of PCC was 84.42% for 90 minute carbonation time by using of HNO3 as solvent. For the XRD patterns it recognized that PCC contained mixture vaterit and calcite crystals. It also was supported by SEM analysis.Keywords: Blood cockle shell, Carbonation, Precipitated Calcium Carbonate (PCC), Variations acid.
Karakteristik Nades (Natural Deep Eutectic Solvents) Dewi, Yuli Piana; Zahrina, Ida; Yelmida, Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
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NADES (Natural Deep Eutectic Solvents) have been widely applied as a catalyst and solvents for extraction/reaction processes. The characteristics of NADES (pH, density, viscosity, surface tension, refractive index) are very important to application of NADES. The increasing density of NADES is influenced by the length of the carbon chain in the HBD and is influenced by the temperature where the higher the temperature the density will decrease. Viscosity is inversely proportional to temperature where the higher the temperature, the viscosity of NADES will decrease. NADES from choline chloride and glycerol are more polar than NADES from choline chloride and ethylene glycol. Surface tension increases with increasing salt ratio. As for the refractive index, the measurement of the refractive index decreases with increasing temperature.Keywords: Catalyst, Characteristics, Density, NADES, Viscosity.
Esterifikasi Asam Lemak Menggunakan Katalis Heterogen Hutagaol, Nurhidayah; Zahrina, Ida; Yelmida, Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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Mono-di-acylglycerol (MDG) is a material capable of joining two compounds with different polarities. MDG is a synthetic emulsifier that can be obtained from the esterification reaction of fatty acids with glycerol using organic catalysts, enzyme catalysts, and heterogeneous catalysts. The esterification reaction is a reaction between carboxylic acids and alcohols to produce esters. Esterification reactions generally use inorganic acids such as H2SO4, esterification reactions generally cause corrosion, to inhibit zeolitic catalysts are used. In this journal, heterogeneous catalysts are used, where heterogeneous catalysts occur in more than one phase, the catalyst can be solid in a liquid or a solid in a gas. Catalysts can speed up chemical reactions without changing at the end of the reaction. In general, heterogeneous catalysts are made from transition metal elements because they have good gas-absorbing properties. Keywords: esterification, heterogeneous catalysts, mono-di-asilglyserol.
Studi Isoterm, Termodinamik Dan Kinetika Adsorpsi Zat Warna Direct Brown Menggunakan Hidroksiapatit Defisien Kalsium Delita, Fuji; A, Yelmida; Herman, Syamsu
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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Dye waste produced by industries contains dangerous and poison materials that could pollute the environment. In this study, hydroxyapatite calcium deficient will be used as medium of adsorption. This process will determine the isotherm models, thermodynamic, and adsorption kinetics models. The dye adsorption process was carried out at various temperatures and initial concentration of dye at a rotating speed of 250 rpm. The maximum adsorption capacity raised at a concentration of 10 ppm and temperature of 30ᵒC with the adsorption capacity of 87.5%. The isotherm model of the direct brown dye adsorption process follows the Langmuir model, since the Langmuir model with R2 approaching to 1 at all variation of temperatures. The adsorption kinetic model of direct brown followed the pseudo second order with 0.9992 of R2 used 40ᵒC of temperature, the initial concentration of direct brown solution was 40 ppm with an adsorption rate constant of 0.052. This study applied physical adsorption which using heat capacity of adsorption (ΔH) of -40,94 kJ / mol which is an exothermic process. Key words : Adsorption, Hydroxyapatite, Konsentration, Dye.
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 Alfarisi, Cory Alfarisi, Cory Dian Alfarizi, Cory Dian Alpina, Clara Shinta Asri 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 Getra Anugrah Habib, Alltop Amri Ya Hadi Ikrima Hadrian Yonas Sebastian Napitupulu 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 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 Ramadhan Ramadhan 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 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 ' Zultiniar Zultiniar Zultiniar, Zultiniar Zultiniar, Zultiniar