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All Journal Jurnal Sains dan Teknologi 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 Martabe : Jurnal Pengabdian Kepada Masyarakat 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 Journal of Community Engagement Research for Sustainability 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 Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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BEBERAPA SENYAWA NON AROMATIS DARI DAUN ANDALAS (Morus macroura Miq.) A., Yelmida
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
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Ayam Ras melalui Proses Presipitasi Agustiyanti, Rini Dwi; Azis, Yelmida; Helwani, Zuchra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Hydroxyapatite is high biactive dan bioafinity ceramic materials. Hydroxyapatite also known osteoconductive, non-toxic, and non-immunogeic. So that there are many application ofhydroxyapatite such as catalyst, fertilizer industry and pharmacy product, protein cromatography application, water treatment, bone and teeth repair. In this research, hydroxyapatite synthesised from PCC of chicken’s egg shell by using precipitation methodwith variation of pH (9, 10, and 11) and stirring speed (200, 250, and 300 rpm). Hydroxyapatite that acquired has been analyze by using FTIR, XRD, SEM-EDX, dan BET. From FTIR analysis best hydroxyapatite acquired by synthesis using pH 11 for stirring speed200 rpm, pH 9 for stirring speed 250 rpm, and pH 11 for stirring speed 300 rpm. From XRD analysis acquired hydroxyapatite with best crystalinity if it comparred with standardhydroxyapatite and smallest crystal size in pH 11 and stirring speed 300 rpm that is 23,07 nm. From SEM-EDX analysis known that acquired hydroxyapatite from synthesis in pH 11and stirring speed 300 rpm has agglomarate shape with particle size 62,5 nm and molar ratio 1,41. The result of BET analysis show that total surface area of hyroxyapatite was 28,406m2/gKeywords: agglomerate, hydroxyapatite, bioctive, stirring, pH, precipitation
Pengaruh Ketebalan Koating TiO2 Dan Konsentrasi Pelarut Etanol Terhadap Voltase Dye Sensitized Solar Cell (DSSC) Menggunakan Ekstrak Buah Senggani (Melastoma Candidum D. Don) Ranti, Aisyah Dewi; Amri, Amun; Yelmida, Yelmida
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

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Abstract

Solar cell is an active element that converts light energy into electrical energy by photovoltaic effect. Dye Sensitized Solar Cell (DSSC)is the into third generation that is solar cells. The aims of this study is to determine the effect of TiO2 layer thickness and the concentration of ethanol to the DSSC voltage. The study began by making a dye solution of 20 grams of Senggani dissolved in methanol, acetic acid and distilled water. FTO glass coating was then performedusing TiO2 that was dissolved in ethanol, then deposited by spin coating and sintering method using furnace. The next step was the manufacture of electrolytic solution, a carbon electrode manufacture and assembly of DSSC. The test results using a UV-Vis absorbance showed that the dye solution containing anthocyanin at 520 nm absorption. DSSC was achieved the higher voltage due the thickness of TiO2. The best result (0.9524 Volt / cm2) by variation of TiO2thickness (≈ 387 m) with ethanol absolute (without dilution). XRD test showed that TiO2 anatase was anatase phase. The morphology test show that the coating of TiO2 with ethanolsolvent have a particles size than coating with distilled water solvent. The adhesion test showed the adhesion coating on the FTO glass was at good qualifications 2B.Keywords: DSSC, FTO glass, TiO2 coating thickness, TiO2
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Ayam Melalui Proses Sol Gel Dengan Variasi Rasio Ca/P Dan Konsentrasi Asam Nitrat Adrian, Melisa; A, Yelmida; Zultiniar, Zultiniar
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

Hydroxyapatite Ca10(PO 4)6(OH)2 is a compound of calcium phosphate which is a bioactive ceramic material with high bioafinity and anorganic components main constituent of bones and teeth. Hydroxyapatite (HAp) can be used as a bone implant, adsorbents and catalysts. Hydroxyapatite synthesis can be performed by using raw materials which is rich in calcium such as egg shell. Calcium in the form of Calcium Carbonate (CaCO3) on the chicken egg shell in this study changed to be precipitated Calcium Carbonate (PCC) through the process of carbonation. PCC from chicken egg shells used as a source of calcium in the synthesis of HAp with a sol gel method. In the synthesis of HAp, Ca and P ratio varied from reactant (Ca/P: 1.57; 1.67; and 1.77) and the concentration of HNO 3 (0.3M; 0.4M; 0.5M) at the stage of PCC dissolution. The analysis result of HAp synthesis with Fourier Transform Infrared Spectroscopy (FTIR) showed that the apatite compound has been formed with the absorption of PO4 3- and OH - ion at the wave number 1,025 and 3,625 cm -1. The highest transmittance obtained on the sample at the concentration of 0.4M HNO3 with the ratio Ca/P 1.77; a concentration of 0.5M HNO3 with the ratio of Ca/P 1.67 and a concentration of 0.3M HNO3 with the ratio Ca/P 1.57. Based on X-ray Diffraction (XRD) analysis, the best HAp obtained in ratio of Ca/P 1.77 and concentration of HNO 3 0.4M with hexagonal crystal structure, with particle size was 46.06 nm. SEM-EDX photograph showed the morphological form of agglomerates. The mole ratio of Ca and P hydroxyapatite from PCC of egg shell was 1.55 and 8.968 m 2/g surface area.Keywords: Precipitated Calcium Carbonate (PCC), Chicken Egg Shell, Hydroxyapatite, Sol gel Method
Sintesis Zeolit 4a Dari Fly Ash Sawit Dengan Variasi Perbandingan Volume Reaktan Dan Kecepatan Pengadukan R, Yolanda.; Yelmida, Yelmida; Zahrina, Zahrina
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

Zeolit defines as Alumina Silika Crystal which have structure 3 dimension that formed by silica and alumina tetrahedral with three voids dimension content with balanced metal load ions of zeolit bone and water molecule that could move freely. Water content in zeolit’s cavity at least 10 – 50%. If it hidrated, cations that place in that cavity will be cover by water molecule and have unstabilize or release easly as it property. Zeolit 4A is shynthetic Zeolit which have load as cation exchange is Na. To produce zeolit 4A, we need ratio of Na2SiO3/ NaAlO2 = ½. Ratio of Si Oxide and Al Oxide in basic material and temperature reaction will be influence type of zeolit that produced. Shyntesys of zeolit 4A with waste material from a process as feed, which is include some procedure: preparation or pretreatment for feed, forming and gel saving, crystalization. Separation, washing and drying. Purpose of this research to get advantage from fly ash as source of silica as feed for zeolit 4A and learn the influnce of ratio of reactan volume (pottasium aluminat and pottasium sillicate) and rate of agitation. Shyntesys of zeolit 4A doing by mix pottasium silicate and poyttasium aluminat with variation of volume at 40:60 and 60:40 ml/ml and rate of agitation at 200, 250, 300, 350 and 400  rpm until it formed as gel. Then the gel will be heated in oven for 8 hours and washed until the pH netral. After washing process, gel will be heated at 120 oC for 3 hours. Synthesize product analyzed with IR Spectroscopy and Xray Difraction. The best result was got in variation volume at 60/40 and rate of agitation at 400 rpm   Keywords : Xray Difraction, Fly ash, Synthesize, IR Spectroscopy, Zeolit 4A
Penurunan Timbal (Pb) Air Laut Pulau Bengkalis Menggunakan Tanah Lempung Dengan Metode Penukar Ion Pada Variasi Tinggi Unggun Dan Debit Aliran Romadona, Syahri; Elystia, Shinta; Yelmida, Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The lack of clean water Sources in the regency of Bengkalis create communities that are the island's shortage of clean water. Moreover, during the dry season, services of PDAM Bengkalis was only able to supply about 10% of the number of existing communities. While Bengkalis island has abundant sea water availability. The purpose of research is to reduce the concentrations of Pb and pH as on the parameter using the method of ion exchange support using column height 1.2 m in diameter 2 inches of clays as well as Kulim size -10+15 mesh that has been on activation by using the HCI. A variation was used in this study is bed hight of 40 cm, 80 cm and 120 cm with discharge flow 80 ml/min, 100 ml/min, and 120 ml/min. Results of the analysis of effluents obtained efficiency for metal Pb is in the range of 41,44% - 89,35%. Metal concentrations of pb with the best reduction of 0,024 mg/L at bed hight variation 80 cm with discharge flow 80 ml/min and the pH from 8,5 to be 7,3. These concentrations already meets the quality of the raw water supply based on PERMENKES416/MENKES/PER/IX/1990. Cation Exchange Capacity (CEC) values obtained at the best efficiency of 78.6 Meq/100 gr with most types of minerals contained in the clay Kulim is a montmorilonit.Keywords: Bed Hight, Clay, Discharge Flow , Ion Exchange, Sea Water Bengkalis
FITOREMEDIASI Zn DARI LIMBAH CAIR PABRIK PENGOLAHAN KARET DENGAN PEMANFAATAN Pistia stratiotes L. Ningsih, Indah Sri Rahma; Lestari, Wahyu; Azis, Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Rubber processing factory is one of big industries in Riau and potentially produce heavy metal such as Zn. The continuous factory activity will produce high level of Zn in liquid waste and cause the contamination of aquatic environment.  One of the alternative efforts to overcome this effect is  using phytoremediation.  P. stratiotes  that is known as a plant that may accumulate metals (Pb, Cd, Cr and Zn)  at high concentration.  This research aimed to test the ability of the growth of  P. stratiotes  and the ability of  P. stratiotes in reducing the content of Zn in liquid waste of rubber processing factory. The research used Complete Random Design.  P. stratiotes  was grown for 20 days in liquid waste of rubber processing factory with the concentrations were 5, 10, 15, 20, 25% and without the liquid waste as a control (0%).  Each concentration had 3 replications. Parameters observed were fresh weight gain and relative growth rate of  P. stratiotes. Data was  analyzed using ANOVA and LSD at the level of 5%. The results showed that the fresh weight  P. stratiotes  increased up to 33.65 g in the concentration of 25%.  The highest relative growth was found in 5thday for all concentrations and control.
PEMANFAATAN Azolla pinnata R. Br DALAM PENYERAPAN Zn DARI LIMBAH CAIR PABRIK KARET SEBAGAI FITOREMEDIATOR Arimby, Citra; Lestari, Wahyu; Azis, Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Large rubber plantations in Riau Province create rubber factories, that potentially produce liquid waste contain Zn above the environment quality standard, that may cause water pollution. Efforts to overcome pollution caused by the waste can be done by phytoremediation using Azolla pinnata. The purpose of this research was to test the effect of rubber factory liquid waste on the growth of A. pinnata. The research used Complete Random Design with dilution of waste treatments 25, 50, 75 and without dillution (100%), and no waste treatment as a control. A. pinnata was grown in each treatment for 12 days. Data was analyzed using ANOVA and tested further with LSD at 5% level. The results showed that the fresh weight of A. pinnata in the waste without dilution increased up to 60.87 g with the highest relative growth was found in 9th day in two treatments (75% dilution and without dilution).
Pengaruh Berat Katalis La/ZnO Dan Kecepatan Pengaduk Terhadap Produksi Biodisel Dari Crude Palm Oil (CPO) (Elaeis guineensis Jacq) Musbar, Al Swendo; Bahri, Syaiful; 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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Abstract

iodiesel is one of the alternative fuel substitute environmentally friendly solar. The use of biodiesel as fuel for diesel engines can lower emissions compared to petroleum diesel. Total petroleum reserves are declining causes high world oil prices, to address this then required the development of renewable alternative energy derived from vegetable oils, biodiesel that is one of them. This research aims to produce biodiesel from CPO uses a heterogeneous catalyst La/ZnO, determine the characteristics of the catalyst and biodiesel as well as determine the selectivity of the catalyst La/ZnO. La/ZnO catalyst made of metal by way of La in the impregnation into the ZnO with 3% (b/b) ZnO, drained using the oven and calcination, oxidation and reduction. The process of making biodiesel is made through one stage of esterification and Transesterification was conducted simultaneously, stirring speed variation (200, 300, and 400 rpm) catalyst weight variation of ZnO 0.5 1, 1.5 and 2%, weight 80 grams and CPO sample methanol oil ratio against methanol 1:9 is inserted into the reactor for Transesterification reaction lasts for 60 minutes at a temperature of 60 ° c. This research resulted in the largest biodiesel yield on never stirring 200 rpm with a weight of catalyst 1% of 92.48%. Characteristics of catalyst has a surface area of 14.590 m2/gr La/ZnO catalyst has a good selectivity againts methyl palmitate. Keywords: biodiesel, CPO, La/ZnO catalyst, transesterification
Biokonversi Kertas HVS Bekas Menjadi Bioetanol Dengan Variasi Kondisi Hidrolisis Asam Dan Waktu Fermentasi Wahyu, Pri; Chairul, Chairul; 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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Abstract

Indonesia is one of the largest paper producing and exporting countries in the world. Along with the increasing production of paper, the amount of used paper in the world is increase, and in Indonesia also. Waste paper is a very large source of fiber, if this can be used properly, waste paper can produce bioethanol which is able to overcome the scarcity of fossil fuels. Every kilogram of waste paper can produce 0.28 liter of bioethanol with proper operation condition. The purpose of this study is to see the effect of the pretreatment process, find the best acid hydrolysis parameters, and also to find the optimum fermentation time of used HVS fiber with separate hydrolysis and fermentation (SHF) method. The sequence of this study is; pretreatment with NaOH solution for deinking process, then hydrolysis process with variation of acid concentration 2%, 4%, 6% dan 8% for two hours in variation temperature 120, 130 and 140 oC, and the last is fermentation. In the fermentation process, 1 gram Saccharomyces cerevisiae is added in to the sample and let the fermentation process is occur with time variation 24, 48, 72 and 96 hour. The maximum sugar concentration can produce from the hydrolysis process is 85,53 gr/l with acid concentration 8% and hydrolysis temperature 120 oC. The best time for fermentation is 72 hours with bioethanol produced 4%.Keywords: Bioethanol, fermentation, hydrolysis, Saccharomyces cerevisiae, waste paper.
Co-Authors Abd. Rasyid Syamsuri Ade Putra Adrian, Melisa Agustiyanti, Rini Dwi Ahmad Fadli Ahmad Fadli Ahmad Fadli Ahmad Fadli Aidil Akbar Aisyah Dewi Ranti, Aisyah Dewi Akbar, Anif Aulia Alfarisi, Cory Alfarisi, Cory Dian Alpina, Clara Shinta Asri Amun Amri Anisa Mutamima Aras Mulyadi Ari Wibowo Harahap Audrya, Helsa Azriyenni Azhari Zakri Bahruddin Bahruddin Bahruddin Bintoro Bintoro Blesvid, Bloomy Caesari Caesari Cece R Chairul Chairul Chairul Chairul Chandra Marzuki Nababan Citra Arimby Cory Dian Alfarisi Cory Dian Alfarisi Cory Dian Alfarisi Cory Dian Alfarizi Dani Pradana Dedeng Hermoyo Delita, Fuji Dewi, Yuli Piana Dhini Octavianty Dian Novita Rahmawaty Dini Aulia Sari Ermal Drastinawati Drastinawati Edy Saputra Elvi Yenie, Elvi Evelyn Evelyn EVELYN EVELYN Fadli, Deno Febri Fadly Sitohang Fajril Akbar Fajril Akbar Getra Anugrah Hadi Ikrima Hadrian Yonas Sebastian Napitupulu Helda Sri Rahayu, Helda Sri Hidayat, Muhammad Ariful Holyness Nurdin Singadimedja Hotni Lamtiar Hutagaol, Nurhidayah I Gusti Bagus Wiksuana Ida Zahrina 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 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 Khairil Amri Muhammad Rahman Muhammad Syafiq Izzuddin Muhammad Yahya Muhammad Yusro Annur Mukhlis Khoirudin, Mukhlis Musbar, Al Swendo Nurfajriani Nurfajriani Nurfatihayati 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 Ryan Tito Sanredina Sanredina Saragih E Sari D. P Shinta Elystia Silvia Reni Yenti Sisi Oktadira Kalpatari Siti Rahmalia Sri Hidayanti Sri Murda Niati Sri Rezeki Muria Sunaro Sunarno Syafruddin Syafruddin SYAIFUL BAHRI Syamsu Herman Tanjung, Muhamad Adrian Toni Arissaputra Utama, Panca Setia Utami Utami Wahyu Lestari Wahyu, Pri Widya Pangestu Wisrayetti Wisrayetti Wisrayetti Wisrayetti Yeni Kusumawaty Yoga Deswan Suwary Yuliatmi Yuliatmi Yunus Olivia Novanto Yunus, Aulia Yusnimar Sahan Yusnimar Yusnimar, Yusnimar Zahrina, Zahrina Zakwan Zakwan Zarkasi, Shoumi Zikri, Ahmed Zuchra Helwani Zuchra Helwani, Zuchra Zultiniar ' Zultiniar Zultiniar Zultiniar Zultiniar Zultiniar, Zultiniar Zultiniar, Zultiniar