Article Per Year (5 Year)
p-Index From 2021 - 2026
3.249
P-Index
This Author published in this journals
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 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

Published : 113 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 113 Documents
Search

 2   3   4   5   6 
Optimasi Kadar Maleat Anhidrat Dan Suhu Pada Pembuatan Maleated Natural Rubber Melalui Proses Grafting Yunus, Aulia; Yelmida, Yelmida; Bahruddin, Bahruddin
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Natural rubber can be developed through a process called Maleated Natural Rubber grafting. A study about the influence of the composition of maleic anhydric (MAH) and temperature on the degree of grafting has been done before. The purpose of this research is to determine the optimum composition and temperature in the process of MAH grafted natural rubber. The composition of MAH is 7, 8, 9, and 10 phr with temperature conditions is 150, 155, 160 and 165oC. The grafting process use internal mixer operated at 60 rpm for 10 minutes. Grafting degree determined by titrimetric method where MNR in xylene solution titrated using MeOH solution. The results showed that the optimum composition and the temperature are 8.36 phr and 160oC with 3.62% grafitng degree.  Keywords: grafting degree, maleic anhydric, maleated natural rubber, optimation, temperatur
Adsorpsi Logam Seng (Zn) Menggunakan Precipitated Calcium Carbonate (PCC) Dari Limbah Cangkang Kerang Lokan (Geloina expansa) Rahayu, Helda Sri; Elystia, Shinta; Azis, Yelmida
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Zinc (Zn) was a heavy metal that has a high toxicity and the presencein water or wastewater could be derived from industrial activitiesand activities of households. One of technology that can be applied to set aside Zn metals in wastewater wasadsorption method using PCC (precipitated Calcium Carbonate) of waste shells seashell. Zn metal concentrations were analyzed using instruments Atomic Absorption Spectrophotometer (AAS). This research aims to study the PCC capabilities in designated metal Zn in the variation of the mass of adsorbent 1; 2;3 and 4 grams, pH 4; 6 and 8 and a contact time of 15; 30; 45 and 60 minutes. The results showed the highest removal efficiency of Zn occurs at pH 6, and 3 grams of adsorbent mass contact time of 30 minutes with an efficiency of 99.058%. While the lowest efficiency at pH 4, the mass of adsorbent 3 grams and 15 minutes contact time with an efficiency of 1.533%. The adsorption process was assumed that the type of adsorption isotherms obtained is Langmuir isotherm assumed monolayer coating formed with R2 values of 0.541 and the value of adsorption capacity is 7.274 mg Zn / g PCC.. The results of XRD analysis showedthat the crystal structure of the PCC (CaCO3) after adsorption shaped calcite are seen from a row of intensity of diffraction peaks with 2 values similar to standard CaCO3 ICDD 01-076-2713.Keywords:adsorption,PCC lokan calm shell, adsorbent mass, pH, contact time, Zn.
Pembuatan Biofuel Dari Minyak Goreng Bekas Melalui Proses Catalytic Cracking Dengan Katalis Fly Ash Hazzamy, M Asyraf; Zahrina, Ida; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Petroleum is a fossil fuel that can not be renewed but dwindling availability. Biofuel is a renewable alternative energy that can replace petroleum. The manufacture of biofuels by using catalytic cracking feedstock used cooking oil. Cooking oil is a waste product of the food industry. Dangerous if used cooking oil because it contains carcinogens and when discharged into the environment causing pollution. Oleic acid and palmitic acid contained in the used cooking oil is high enough to be able to be converted into biofuel. Variations used are temperature process (380 0C, 400 0C, 420 0C) and weight of fly ash 5%, 7% and 9% of the weight of used cooking oil. This study aims to produce a maximum yield of biofuel from used cooking oil by catalytic cracking catalyst silica from fly ash oil. Results were analyzed by the method viskosimetri cracking. Density stands at cracking results from 0.7727 to 0.7930 g / ml. Best yield obtained was 31.72% at 420 0C and 9% by weight of fly ash.  Keyword : Biofuel, catalytic cracking, fly ash, wasted cooking oil
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Terumbu Karang Melalui Proses Presipitasi Dengan Variasi Rasio Ca/P Dan PH Mahdi, Zamratul; Azis, Yelmida; Fadli, Ahmad
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hydroxyapatite is a crystalline molecule composed of phosphorus and calcium with the molecular formula Ca10 (PO4) 6 (OH) 2. Synthetic hydroxyapatite is known as one of the important implant materials because it has bioactive, biocompatible and osteoconductive properties that chemically resemble the mineral components of bones and teeth, so that it can be used as a substitute for human hard tissue. In this study hydroxyapatite synthesized from PCC coral reef using precipitation method with variations in pH (9, and 11) and Ca / P mole ratio (1.60; 1.67; 1.70; 1.77 and 1.80). The hydroxyapatite obtained was then analyzed by XRD and SEM analysis. From the results of XRD and SEM analysis obtained the best hydroxyapatite with the best crystallinity closest to standard hydroxyapatite, pH 11 Ca / P 1.60 ratio with 88.7% crystallinity and 26.9 nm crystal size Keyword: carbonation, Ca / P ratio, PCC, pH, precipitation,
BEBERAPA SENYAWA NON AROMATIS DARI DAUN ANDALAS (Morus macroura Miq.) Yelmida A.
Jurnal Riset Kimia Vol. 1 No. 1 (2007): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i1.95

Abstract

 ABSTRACT Several non aromatic compounds of the leaf Morus macroura Miq. as the rare Indonesian plant has been extracted using n-hexane as an extractant. The soxletation technique was applied in this extraction. The result are separated by fractionation methods of the liquid vacuum chromatographic and continued with the column gravitation chromatographic. The eluent are n-hexane-ethyl acetate are used in the separation method, based on principles of solvent polarity step by step. These separation was monitoring by  thin layer chromatographic. The identification result by spectroscopy ultraviolet, infrared spectroscopy, mass spectroscopy, 1H-NMR  and   13C-NMR , are four compounds found such as hidroxy tridecanil eicosanoic m.p.67-69 oC, long chain n-alkane m.p. 61-62 oC, long chain aliphatic ester m.p. 65-66 oC and wax ester ketone m.p. 68-70oC. Keywords: non aromatic compound, chromatograhphic
IMPREGNASI LOGAM Cu PADA HIDROKSIAPATIT DARI KULIT KERANG DARAH (Anadara granosa) Zultiniar '; Yelmida A. '; Nuruzzaman Shiqhi
Jurnal Sains dan Teknologi Vol 16, No 1 (2017): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.874 KB) | DOI: 10.31258/jst.v16.n1.p20-23

Abstract

Hidroksiapatit (HAp, Ca10(PO4)6(OH)2) adalah senyawa yang berasal dari kalsium posfat yang termasuk unsur pokok komponen anorganik dari jaringan keras seperti tulang dan gigi. Hidroksiapatit (Hap) adalah material yang digunakan sebagai implan tulang, adsorben, dan katalis. Pada studi (penelitian) ini, Hidroksiapatit yang disangga katalis Cu, disiapkan menggunakan metode impregnasi basah. Katalis Cu-HAp disiapkan dengan memvariasikan jumlah Cu yaitu 3, 6 and 12 % b/b. Larutan dikeringkan dengan pengadukan pada kecepatan 350 rpm pada suhu 30 oC selama 24 jam. Sampel yang kering kemudian dioven pada suhu 105 oC selama 1 jam. Katalis yang telah kering, kemudian dikalsinasi pada suhu 500 oC selama 3 jam. Hasil terbaik yang didapat dari katalis Cu-HAp digunakan sebagai rasio logam Co dan Ni. Hasil impregnasi dianalisis menggunakan spektofotomter FTIR, Surface Area Analyzer (SAA), X-ray diffraction (XRD) dan Scanning Electron Microscopy- Electron Dispersive X-ray (SEM-EDX). Berdasarkan analisis SAA, luas permukaan HAp adalah 17.753 m²/g, sedangkan logam HAp yang paling optimal pada rasio Cu-Hap (3%) mencapai 31.138 m²/g, yang berarti peningkatan luas permukaan mencapai 75%. Analisa dari difraksi X-ray menunjukkan hasil yang tidak signifikan, berbeda dibandingkan dengan katalis H-Ap. Hasil analisa unsur dengan SEM-EDX menunjukkan bahwa proses impregnasi logam pada hidroksiatpatit cukup berhasil. Proses impregnasi dipengaruhi oleh pengadukan, pengeringan, dan proses kalsinasi.
Adsorpsi dan Pelepasan Doxorubicin dari Permukaan Partikel Magnetit/Hidroksiapatit Sri Murda Niati; Ahmad Fadli; Yelmida Aziz
Jurnal Sains dan Teknologi Vol 18, No 2 (2019): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.365 KB) | DOI: 10.31258/jst.v18.n2.p50-56

Abstract

Cancer is a disease caused by poor cell growth in body tissues. One effective method of dealing with cancer cell growth is the nanomedicine or nano drug delivery approach. Biocompatible, biodegredable and non-toxic drug delivery material for the body is magnetite / hydroxyapatite composite. This research uses hydrothermal method to produce magnetite / hydroxyapatite composites. Furthermore, to determine the performance of magnetite / hydroxyapatite composites as drug delivery through adsorption kinetics and mathematical models of doxorubicin decay on the surface of the composite and the value of the mass transfer coefficient. The concentration of doxorubicin used for adsorption was 520, 720, 920 (ppm) with a composite mass of 0.2 0.3 0.4 and 0.5 (grams) and an adsorption temperature of 30, 40, 50 (0C). The doxorubicin release model in the composite layer uses PBS solution media pH 7.4 with a temperature of 370C. The results obtained for doxorubicin adsorption kinetics on composite surfaces were 71.43; 55.56; 90.91 mg/g for temperature variations of 30, 40, 50 °C with (R2) is 0.980 and % SSE by 33% and kinetics constant adsorption 0.282. Decay of doxorubicin in vitro using PBS solution was obtained. The value of the mass transfer coefficient obtained increased with the increase in the mass of the magnetite/hydroxyapatite composite, for the mass of the magnetite/hydroxyapatite composite 0.2; 0.3; 0.4; and 0.5 grams (kc) values obtained were 1.1 x 10-4 g/cm2.minute, 4.4 x 10-4 g/cm2.minute, 9.9 x 10-4 g/cm2.minute and 2 , 1 x 10-3 g/cm2.minute.
Perengkahan Katalitik Palm Fatty Acid Distillate Menjadi Biofuel Menggunakan Katalis Natrium Karbonat Dengan Variasi Temperatur Dan Konsentrasi Katalis Natrium Karbonat Muhammad Yusro Annur; Yelmida Yelmida; Zultiniar Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Oil Fuel consumption in indonesia is very high and keep increasing every year, but not in balance with total supplies of fuel oil so biofuel as alternative fuel is needed. Biofuels can be produced by catalytic process palm fatty acids destilat (PFAD) using catalysts sodium carbonate (Na2CO3). The purpose of this research it to get highest yield in the process of making biofuel with variations of temperature (350oC – 430oC), concentration catalyst (0,5-2,5 % wt), weight feed PFAD 150 grams and flow rate of N2 150 ml/s. The results test of catalytic process obtained by conversion highest value of 37,66 % in temperature 410 oC and catalyst concentration Na2CO3 2% wt. wiht composition 38,37% gasoline, 12,79% kerosene and 30,61% diesel, while at catalyst concentration Na2CO3 1% wt. obtained yield 31,77% with composition 38,37% gasoline, 12,79% kerosene and 30,61% diesel. Dominant composition results in this research are kerosene and gasoline fraction.Keyword : Biofuel, Cracking, Gasoline, Kerosene, PFAD
The Effect Of Initiator Composition, Temperature, And Time On Ester Polymerisation Process Of Palm Fatty Acid Distillate Aidil Akbar; Bahruddin Bahruddin; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Palm Fatty Acid Distillate (PFAD) as a byproduct of the processed of palm oil has great potential to be used as raw material for polyester synthesis. The purpose of this research is to study ester polymerisation from PFAD with the composition of initiator, time and temperature as the parameters. First, the esterification process was done by the reaction of PFAD and methanol that used sulfuric acid as catalyst. The reactant composition was 1:8 molar ratio, speed of stirrer at 150 rpm, and H2SO4 composition is 1% (w/w) PFAD with temperature at 70° C for 2 hours. The polymerisation process was done by the reaction of esterification stage product and mixed with benzoyl peroxide as initiator. The variation for this stage were the composition of benzoyl peroxide 1%, 5%,and 9% (w/w) of methyl ester, polymerisation time 4, 5 and 6 hours and polymerisation temperatures of 140, 150 and 160° C. The result showed that the esterification stage product was obtained methyl ester and GC-MS analysis showed that the purity of methyl esters is 90,1%. Polymerisation product that is obtained a polyester but still have vinyl group in the component of the product. Based on the results of polymerisation reaction of the end product, dark and thick and has a viscosity of 180-200 cp. Based on the test results of GC-MS the composition of the methyl ester was reduced from 27.67% to 5.62% as the product of polymerization process which mean that the methyl ester have been converted. The R2 in this study gained 0.9663 which means a significant and lack of fit value of 0.1341 which means insignificant then the variable had a p-value of 0,0002 for the model which it less than α = 0.05 with variables that had a significant impact on model.Key words: benzoyl peroxide, palm fatty acid distillate, polyester, synthesis
Sintesis Hidroksiapatit Dari Limbah Kulit Kerang Lokan (Geloina Expansa) Dengan Metode Hidrothermal Mohd Fazhlur Arrafiqie; Yelmida Azis; Zultiniar Zultiniar
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hydroxyapatite Ca10(PO4)6(OH)2is 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 lokan calm shell with a composition of 99.45% CaCO3. PCC lokan calm shell which has calcium source was synthesized to HAp by hydrothermal process with varied times of the reaction (12 hours, 16 hours, 20 hours) 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, synthesisof Hap with hydrothermal method through precipitated calcium carbonat (PCC)showedthe formation of hydroxyapatite in the presence of peaks PO43- dan OH-.The highest peakis obtained at reaction temperature 140oC at reaction times of, 12 hours, 16 hours, 20 hours. XRD diffraction results in hydroxyapatite get the highest purity obtained at temperature of 140oCat time of 20 hour with a hexagonal crystal structure. 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 seashells waste through the PCC is 1,58.Keywords: PCC Lokan Calm Shell, pH, Temperature, Hydroxyapatite, Hydrothermal Method.
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