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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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Adsorpsi Logam Cd, Cu Dan Pb Dengan Menggunakan Hidroksiapatit (HA) Sebagai Adsorben Kendro Prasetyo; Yelmida Azis; 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

This study investigated the ability of hydroxyapatite (HA) to adsorb aqueous Cd2+, Pb2+ and Cu2+ metal ions from single-metal and multi-metal ions reaction systems. Hydroxyapatite as adsorbent made from wasted-eggshell through precipitate calcium carbonate (PCC) processes. Based on AAS as intrumentation, show that in single metal ions adsorption, the sorption affinity of HA for Pb(II) is always higher than that for Cu(II) and for Cd(II); the sorption maxima for the Cd2+, Pb2+ and Cu2+ metal ions follow the order Pb2+ > Cu2+ > Cd2+. The greatest sorption percentage of Pb(II) is 99,338% ; Cu(II) is 95,403% and Cd(II) is 86,343%. The sorption affinity of HA for metal ions follow the order Pb2+ > Cu2+ > Cd2+ , this could be inversely proportional to the hydrated ionic radii as Pb2+ (4.01 Å) < Cu2+ (4.19 Å) < Cd2+ (4.26 Å).Keywords: hydroxyapatite (HA), Cd, Pb, Cu, competitive adsorption, adsorption selectivity, hydrated ionic radii
Pemurnian Selulosa-α Hasil Hidrolisis Pelepah Sawit Menggunakan Enzim Xylanase Dengan Variasi pH Dan Sumber Enzim Xylanase Sari D. P; 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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Midrib palm is one of the waste that produced from palm farming which contain alpha cellulose about 35%. The component of alpha cellulose could be used as a raw material for nitrocellulose if it is has more than 92% of purity. So to increase the purity of alpha cellulose, midrib palm has to be treated by purifying step. In this time, chemical still be choices to be material for purify alpha cellulose, while as we know that chemical has a bad impact for our envirotment. So it is important to search another purifying agent and it is xylanase. Xylanase is one of enzyme that has an ability to break up the link between xylose in xylan. So the purpose of this research are to use xylanase as another purifying agent, to know what is the best pH for this purifying process and to compare the result between two xylanases that produced from different fungi. Before start the purifying step, midrib have to through extraction step to remove all extractive and continue with hydrolisis step by using extraction liquid of palm empty bunch ash. Then after that purifying step can be done at 600C for 1,5 hours by making some differences at pH (4,5 and 6). The highest purity of alpha cellulose was reached at pH 6 by using xylanase from Aspergillus niger about 97,55%. So the conclucion of this research are, the best pH for purifying process by using xylanase is 6 and the best xylanase is the one which produce from Aspergillus niger. Beside that, the use of xylanase which is comes from the same species will be not affected much to the purifying result.Keyword : hydrolisis, midrib palm, xylanase enzyme
Sintesa Precipitated Calcium Carbonate (PCC) Dari Cangkang Kerang Darah (Anadara Granosa) Dengan Variasi Ukuran Partikel Dan Waktu Karbonasi Lucy Rahmawati; Amun Amri; 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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Precipitated Calcium Carbonate (PCC) is a product of the processing of natural materials containing calcium carbonate resulting from the precipitation process with high purity. Bloodcockle shell can be used as a source of calcium for precipitated Calcium Carbonate. The purpose of this study to produce PCC of waste shells blood with carbonation method and determine the particle size of the PCC and the best carbonation time. Synthesis performed using carbonation method by adding nitric acid to the slaking process. Blood cockle shell samples prior shells calcined at a temperature of 900°C for 3 hours to form calcium oxide and then dissolved with nitric acid (slaking process) with a particle size variation CaO (+ 20-60; + 60- 100; +100-120) mesh forming CaNO3, then added ammonia to pH 12, the next process of Ca (OH)2 CO2 gas flowing until the time was varied (0.5, 1, 1.5) hours to form a white precipitate which is precipitated Calcium Carbonate. The use of inorganic acids in this study aims to improve the solubility of CaO in the slaking process so that a high yield of the products obtained.The highest yield of PCC obtained at treatment +100-120 mesh particle size and carbonation time of 1.5 hours, with the percentage yield of 88.58%. Results of analysis Atomic Absorption Spectrophotometry (AAS) obtained CaCO3 content of 76.6%. From the pattern of X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) can be seen form the resulting crystal is a mixture vaterit and calcite.Keywords : Blood cockle shell, Method of Carbonation , PCC , Particle Size , ,Time Carbonation
Modifikasi Pati Sagu Dengan Metode Asetilasi Untuk Peningkatan Sifat Tensile Bioplastik Yoga Deswan Suwary; Yelmida Yelmida; Bahruddin Bahruddin
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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Bioplastics are an alternative material to replace conventional plastic packaging so as not to pollute the environment. One method of modifying bioplastics is the acetylation method which is a modified starch method obtained from reacting starch with hydroxyl groups to produce hemiacetal and aldehyde. This study aims to make modified bioplastics with better tensile strength than ordinary bioplastics. The analysis performed was FTIR test, substitution degree test, and mechanical properties of tensile strength. The best results from each test are the value obtained by the value of the substitution degree 0,992, FTIR at the vibration for the wavelength range 1633 - 1645 cm-1, the tensile strength value of 1,893 MPa bioplastically penetrated the decay results of the methylated starch and 12 % filler content b / b and 10 % plasticizers b / b.Keywords : acetylation, bioplastic, acetylated starch, acetylated bioplastic
Impregnasi Logam Co, Cu Dan Ni Pada Hidroksiapatit Yang Disintesis Dari Kulit Kerang Lokan (Gelonia Expansa) Nuruzzaman Shiqhi; Yelmida A; 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 (HAp, Ca10(PO4)6(OH)2) is a compound of calcium phosphate which is the main constituent of the inorganic component of human hard tissue such as bone and teeth. Hydroxyapatite (HAp) is a material used as a bone implant, adsorbents and catalysts. In this study, hydroxyapatite supported Cu catalyst was prepared using wet impregnation method. A series of Cu-HAp catalysts have been prepared by varying the amount of Cu viz., 3, 6 and 12 % w/w. The solutions were dried with stirring 350 rpm at 30 oC for 24 h. The dried samples were kept in oven maintained at 105 oC for a duration of 1 h. Finally, the dried catalyst were calcined at 500 oC for 3 h. The best results of the catalyst Cu-HAp used as the ratio to the metal Co and Ni. Impregnation results were analyzed using FTIR spectrophotometer, Surface Area Analyzer (SAA), X-ray diffraction (XRD) and Scanning Electron Microscopy - Electron Dispersive X-ray (SEM-EDX). Based on the analysis SAA synthesized HAp surface area was 17.753 m²/g, while the metal-HAp most optimal in Cu-HAp (3%) reached 31.138 m²/g, meaning that the increase in surface area reaches 75%. Results of analysis by X-ray diffraction, it shows insignificant different compare to HAp catalyst. Results of elemental analysis by SEM-EDX showed that the metal impregnation process on hydroxyapatite was quite successful. The impregnation process is influenced by stirring, drying and calcination process. Keywords: calcination, catalyst, hydroxyapatite, impregnation, metals (Cu, Co and Ni)
Pengaruh Waktu Reaksi Dan Penambahan Volume Enzim terhadap Pemurnian Selulosa-α Pelepah Sawit Menggunakan Enzim Xilanase Dari Trichoderma sp Putri M F; 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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Palm midrib is one of the solid waste from oil palm plantattions and there is approximately 35% α- cellulosa component. Cellulose which contained in waste palm midrib are very potential to transform into nitrocellulose raw material. Purify of cellulose above 92% can be used to make main propelan raw material or explosive matter. The purpose of this research was to got the best condition of addition from xylanase enzyme and the best time of reaction from purifying α-cellulose palm midrib process as a main nitrocellulose raw material. Palm midrib has to accomplished by several steps of purify such as extraction, hydrolysis, and delignyfication, and then continue to purifying process with xylanase enzyme on 60oc phase, pH 5, ratio of palm midrib: aquadest 1:25 in term of enzyme volume addition and time of reaction variation. The analyst of cellulosa that pass the hidrolysis show the purity α-cellulose is 86,48%. The best condition is able at  enzyme volume addition 3 ml and time of reaction 90 menit with the purity of α-celluloseobtained 96,6%. So it can be concluded that α-cellulose of the palm midrib pass purity process used the xylanase enzyme can be used for the manufacture of nitrocellulose.Keyword :α-cellulosa,nitrocellulose, palmmidrib,purification,xylanase enzyme
Pengaruh Kecepatan Pengadukan Terhadap Kinetika Reaksi Pembentukan Hidroksiapatit (HAp) Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Itik Melalui Proses Presipitasi Bintoro Bintoro; Yelmida Azis; Fajril Akbar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

Hydroxyapatite (Ca10(PO4)6(OH)2) is a calcium phosphate compound that has been widely used as a bone implant material because its chemical composition is identical with natural bone. The purposes of this research are synthesis, characterization and study of kinetics of hydroxyapatite formation reaction with PCC (Precipitated Calcium Carbonate) base material of duck eggshell using precipitation method. In this study the samples were taken every 10 minutes as much as 10 mL for 1 hour of stirring, continued stirring up to 24 hours with variation of stirring speed (100; 150; 200; 250; 300 rpm) and ageing for 24 hours. The analysis of Ca concentration in the filtrate was done using the complexometry method. Hydroxyapatite is characterized by XRD. The crystalline structure and the calcium phosphate group in the sample indicate the hydroxyapatite compound. Kinetic synthesis reactions follow the second order equation with the value of reaction rate constant obtained by 0,6277, 0,7284, 0,7668, 0,5674, 0,6285 minutes-1. Keywords: Hydroxyapatite, kinetics reaction, PCC, duck’s eggshell, precipitation, second order
Sintesis Hidroksiapatit Melalui Precipitated Calcium Carbonate (PCC) Cangkang Kerang Darah Dengan Metode Hidrotermal Pada Variasi pH Dan Waktu Reaksi Ari Wibowo Harahap; Zuchra Helwani; 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

Hydroxyapatite Ca10(PO4)6(OH)2 is a calcium phosphate compound which is a bioactive ceramic material with high bioafinitas, used as bone implants, adsorbents and catalysts. Synthesis of hydroxyapatite can be made by using material which is rich of CaCO3 like PCC blood calm shell with a composition of 95.5% CaCO3. In this research, PCC blood calm shell which has calcium source was synthesized to HAp by hydrothermal process. pH of the reaction (10, 11, 12) and time reaction (22,24,26 hours) was be varied. The outcome of synthesis was characterized by using FTIR, XRD, SEM. The results of FTIR analysis, synthesis of HAp with hydrothermal method showed the formation of hydroxyapatite in the presence of peaks PO43- dan OH-. The highest peak is obtained at pH 10,11,12 at time reaction of 26 hours. XRD diffraction results in hydroxyapatite get the highest crystallinity at pH 12 at time reaction 26 hours with a hexagonal crystal structure and produce a more pure hydroxyapatite. SEM results showed morphology with clots and irregular round shape.Keywords : PCC blood calm shell, pH, time reaction, hydroxyapatite, hydrothermal method.
Sintesis ZSM-5 dari Fly Ash Sawit Dengan Variasi Waktu Sintesis Dan Waktu Kalsinasi Rafif Sauqi; Fajril Akbar; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
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Abstract

Fly ash contains many elements of the high silica used as a source of silica for the synthesis of ZSM-5. ZSM-5 zeolite synthesis is one that is widely used in industry mainly as a catalyst. This is due to the ZSM-5 has a high activity and selectivity in several hydrocarbon conversion reactions. This study aimed to the synthesis of ZSM-5 of fly ash as a silica source without using templates with the time variation of the synthesis and calcination time. Synthesis performed in autoclaf at 190 ° C with a temperature variation of synthesis time 16, 18, 20 and 22 hours, calcination is done in a furnace to a temperature of 500 0 C with a variation of calcination time 4 hours, 5 hours and 6 hours. Synthesis products were analyzed by FTIR. The results showed that the best conditions for the synthesis of ZSM-5 from fly ash oil is at synthesis time of 20 hours and calcination time 4 hours. The content of ZSM-5 produced in the x-ray analysis is as much as 3%.Keyword : Fly ash, ZSM-5, FTIR, and XRD
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Terumbu Karang Melalui Proses Hidrotermal Dengan Variasi Rasio Ca/P Dan pH Reaksi Muhammad Khairil Amri; Yelmida Azis; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is one of the calcium phosphate compounds which is the main inorganic component of composing human hard tissue such as bones and teeth. Hydroxyapatite (HAp) is a material used as bone implant, adsorbent and catalyst. The purpose of this study was to determine the effect of variations in the Ca/P ratio (1.57; 1.67 and 1.77) and reaction pH (9, 10 and 11) to degree of hydroxyapatite crystallinity, and compare the results of XRD hydroxyapatite characterization on the variations carried out. The research begins with the calcination process of coral reefs to form CaO which is made into PCC using the carbonation method. Coral PCC and (NH4)2HPO4 were reacted using hydrothermal vessels with variations in the Ca/P ratio (1.57; 1.67 and 1.77) and mixing pH of reactants at (9, 10 and 11), reaction time for16 hours at 140oC. The synthesis results will be analyzed using X-Ray Diffractometer (XRD) and Scanning Electron Microscopy (SEM-EDX) and Brunaeur-Emmet-Teller (BET). The hydroxyapatite results were obtained on the condition of 1.67 Ca / P ratio and pH 11 with a crystal diameter of 26.91 nm, crystallinity degree of 74.55%, final Ca / P ratio of 1.66 and wide surface which is 27,003 m² / g.Keywords: hydroxyapatite, hydrothermal, carbonasi, precipitate calcium carbonate
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