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All Journal Reaktor Jurnal Sains dan Teknologi Mechatronics, Electrical Power, and Vehicular Technology Jurnal Sains Materi Indonesia Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Konversi Journal Of Chemical Process Engineering (JCPE) Indonesian Journal of Chemistry Communications in Science and Technology Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Teknomekanik Unri Conference Series: Community Engagement Journal of Applied Materials and Technology Journal of Bioprocess Chemical and Environmental Engineering Science Journal of Community Engagement Research for Sustainability SAINSTEK Estungkara: Jurnal Pengabdian Pendidikan Sejarah Journal Of Chemical Process Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN Journal of Engineering and Technological Sciences Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Amun Amri
Department Of Chemical Engineering, Faculty Of Engineering, Riau University
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering 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 Mechanical Engineering Nursing Public Health Social Sciences Other

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Pengaruh Penambahan Hidroksiapatit Dan Waktu Pencelupan Terhadap Pelapisan Logam Stainless Steel 316L Dengan Metode Dip Coating Nisa Mulya; Ahmad Fadli; Amun Amri
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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Stainless Steel 316L is metal that can be used as a bone plate, but it has low biocompatibility. To improve the biocompatibility Stainless Steel 316L coating hydroxyapatite is used. Thepurpose of this research was to study the effect of hydroxyapatite addition and dipping time on characterization of Stainless Steel 316L coated with HAp using Dip Coating Method. Metal with a size of 2x1x0,1 cm was dipped into a suspension containing HAp, sago starch and water that mixed with a rate of 150 rpm for 20 hours. The coating was done by varying the addition HAp 8, 10, 12 gr and dipping time of 2, 6, 10 seconds. The dipped Stainless Steel 316L was dried in oven at temperature 110 °C for 10 minutes. Coating HAp were sintered at temperature 800 °C for 1 hour. The research showed with increased HAp addition and dipping time the thickness of the coating HAp increased. With maximum shear strength obtained in this research is 0,24433 MPa.Keywords : Coating, Dip Coating, Hydroxyapatite and Stainless Steel 316L
Sintesa Coating Kobalt Oksida Dengan Proses Sol-Gel Dip-Coating Sebagai Solar Selective Absorber : Pengaruh Konsentrasi Molar Co Dan Ulang Deposisi Dimas Nofriyan; Amun Amri; 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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The Study of the solar absorber with cobalt oxide as the heat absorbing surfaces has been conducted. A dip-coating technique has been used to deposit cobalt oxide coatings on aluminum substrates. A solution of cobalt oxide was prepared in a bath by first mixing Co(NO3)2.6H2O, ethanol and a small amount of propionic acid. The sol prekursor was stirred for 2 hours at room temperature. Pieces of aluminum with size 2x4x0.5cm were cleaned using a solution of phosphoric acid 10% at temperature 50oC for 10 minutes. The coating was synthesized by varying molar percursors 0.1M; 0.2M; 0.3M and the number of dipping-drying cycles 2x, 4x, 6x, 8x and 10x, then annealed at temperature 550 oC for 1 hour. The solar absorptance and emittance were parameters to characterize the performance of the absorber. In practical terms, this generally corresponded to absorbing short wavelengths up to a certain cut-off wavelength (solar spectrum, UV-VIS-NIR), and a low thermal emittance in the IR wavelength region. Consequently, this research attained high performance solar selective absorber of which solar absorptance was 80,14% and emittance was 7,65% on 4 cylcles. Values of selectivity, α/ɛ = 10,48 were obtained. XRD test showed the crystal structure of cobalt oxide, SEM test showed the surface structure of the coating was relatively homogenous and adhesion test showed the adhesion between the coating and the substrate can be categorized as very strong (5B scale ASTM D 3359).Keyword : coating, solar selective absorber, sol-gel dip-coating
Sintesa Precipitated Calcium Carbonate (PCC) Dari Cangkang Kerang Darah ( Anadara Granosa) Dengan Variasi Suhu Kalsinasi Dan Variasi Rasio CaO/HNO3 Paul Destin Purba; Amun Amri; Zultiniar Zultiniar; Yelmida Yelmida
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

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Precipitated Calcium Carbonate (PCC) is a calcium based chemical product that recently has widely utilized in application. The purpose of this research is to obtain PCC at once as the waste problem solver. This research using carbonation method with tested variable were the calcinations temperature and ratio of calcium oxide by nitric acid. The crushed sample were calcined according to the temperature variations (700oC, 800oC, and 900oC). Furthermore, the formed calcium oxide was slacked into the nitric acid according to several calcium oxide by nitric acid ratio (14:300, 17:300, and 20:300 gr/ml). The formed nitric calcium then was added by ammonia to pH 12 to start the synthesis calcium hydroxide. Next subsequent was carbonation, in case flowing calcium hydroxide by carbon dioxide to form white precipitate (PCC). Based on the analysis, the best result of PCC obtained at calcinations temperature of 900oC with the ratio of 14 gr:300 ml that gained 84,88%. The X-Ray Diffraction (XRD) showed that the type of crystals formed were vaterit. The Scanning Electron Microscopy (SEM) showed that the shape of crystals were round (sphere-like) with a relatively uniform size.Keywords: Calcination, carbonation, cockle shell, precipitated calcium carbonate.
Pembuatan Bio Oil Dari Kayu Cemara Laut (Causarina Equisetifolia L) Dengan Teknologi Pirolisis Menggunakan Katalis Ni/NZA Rahmansyah Rahmansyah; Syaiful Bahri; Amun Amri
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

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The fundamental problem of national energy today is the tendency of fossil energy consumption increasing, which is not offset by the availability of fossil energy itself. So that the necessary strategic steps to face the energy challenge in the future with the development of renewable energy. One of them by converting biomass into bio oil through pyrolysis technology with the aid of a catalyst. The aims of this research was to produce bio oil from casuarina wood (Causarina equisetifolia L), knowing the physical and chemical characteristics of the bio oil from casuarina wood, determine the effect of supported Ni metal on resulting yield bio oil. Pyrolysis process uses 50 grams of casuarina wood (-100+200 mesh), the catalyst Ni/NZA with metal variation (0%, 2%, 3% w/w) and the variation amount (2%, 3%, 4% w/w), silinap 500 ml, carried out at a temperature 320 0C, stirring speed of 300 rpm by flowing nitrogen gas. The highest yield obtained on 2% of uses catalyst and 3% of Ni metal of 58,058%. Characteristics of the resulting bio oil, in the form of density 1,001 gr/mL, 6,761 cSt viscosity, acid number 17,760 mg NaOH/gr, and the flash point 48 oC.Keywords: bio oil, Causarina equisetifolia wood, Ni/NZA catalyst, pyrolysis
Pirolisis Tandan Kosong Sawit Menjadi Bio-Oil Menggunakan Katalis Mo/NZA Firman Syah; Syaiful Bahri; Amun Amri
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

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Fuel oil is a very important requirement in life. The fuel used for this comes from crude oil extracted from the ground, while fuel oil is non-renewable, so for the next few years is expected the public will experience a shortage of fuel. So, we need alternative energy instead of petroleum. Biomass can be used as bio-oil by pyrolysis. Biomass using such as empty fruit bunches oil. Empty Fruit Bunch Oil is organic waste that has the potential to be used as asubstitute fuel bioenergy, the largest waste generated by oil palm plantations. The purpose of this study is to produce bio-oil from empty fruit bunches of oil using catalysts Mo/NZA the pyrolysis process, as well as determine the effect of the ratio of the catalyst of biomass empty fruit bunches of oil to the yield of bio-oil produced from empty fruit bunches of oil and determine the characteristics of the chemical and physical properties of bio -oil produced from oil palm empty fruit bunches. In this research Empty Fruit Bunch Oil by the size of - 100+200 mesh, 50 grams, 500 ml silinap and catalyst Mo/NZA inserted into of pyrolysis reactor. This process conducted at a temperature 320oC and the stirring speed of 300 rpm operate for about 120 minutes by flowing nitrogen gas. For the optimum yields obtained at 1.5% catalyst Mo/NZA as much as 5% of biomass that is equal to 56.28%. The test results physical properties obtained density of 1.005 g/ml, 2,296 cSt viscosity, acidity 45,373 mg NaOH /g sample and the flash point 52oC. Respectively the characterization of the chemical properties of bio - oil using Gas Chromatography - Mass Spectroscopy (GC - MS) obtained some dominant chemical components such as:: (Pentane, 2,2,4,4-tetramethyl-), (1-Pentene, 2.4 , 4-trimethyl-), (Cyclohexane, 1-bromo-4-methyl), (Hexane, 2,2-dimethyl-), (Pentane, 2,4- dimethyl-).Keywords: bio-oil, biomass, catalyst mo / NZA, oil palm empty fruit bunches
Pembuatan Komposit Bioplastik Konduktif Berbasis Tepung Tapioka Dengan Penambahan Electrochemichal And Mechanical Liquid Exfoliation Graphene Heri Rahmana; Amun Amri; Syelvia Putri Utami
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Conductive bioplastics are biodegradable plastics that have a good ability to conduct electrical current. This study aims to create a conductive tapioca-based bioplastic composite with the addition of EMLE graphene (Electrochemical and Mechanical Liquid Exfoliation) and study the effect of the amount of EMLE graphene addition to the tensile strength and transparency of bioplastics. Conductive bioplastic production was held by using solution intercalation method. The main raw material was tapioca flour as matrix and graphene as filler. Graphene can be produced by using the Electrochemical and Mechanical Liquid Exfoliation method which made in the liquid phase and mechanically crushed or mashed by using a blender. The products were analyzed by using conductive bioplastic tensile test and transparency. The best tensile test value was 3.92 Mpa with elongation 8.516% in addition for 9% graphene and 30 minutes. The best transparency value was obtained 88.31% without graphene addition.Keywords: bioplastics, EMLE, graphene, solution intercalation, tapioca flour.
Sintesis Coating Copper-Cobalt Oksida Pada Substrat Aluminium Melalui Proses Sol Gel Sebagai Solar Selective Absorber : Pengaruh Rasio Molar Cu/Co Dan Ketebalan Coating Peter Peter; Amun Amri; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Solar selective absorber (SSA) is a layer which is selective to absorb solar radiation and convert it into maximum heat energy. The purpose of this research is to synthesize the SSA based on copper nitrate and cobalt nitrate precursor, to determine the influence of molar ratio and dipping times number to absorptance, and emittance of SSA using the sol gel dip coating method.. Aluminum plates with size of 2x4cm2 were cleaned using phosphoric acid 10% by volume at temperature ±50oC for 10 minutes and then washed again with distilled water. Sol precursor was prepared by mixing copper nitrate and cobalt nitrate in ethanol solvent and the addition of propionic acid as catalyst and complexing agent. This solution was stirred at room temperature for 2 hours. The coatings were synthesized by varying molar ratio of [Cu]/[Co] of 0,25; 1; and 4 with the number of dipping 1-10 times. The coatings then were annealed at temperature of 550oC for 1 hour. Reflectance spectra in the UV-Vis-NIR show that an increasing number of dipping and decreasing in the molar ratio of [Cu]/[Co] improved the absorptance (). SSA layer with best absorptance i.e. 84,788% is synthesized using precursors with a molar ratio of 4 at 10 dipping times, and emittance (ε) generated amount 8,999%.Keywords : aluminum, dip coating, solar selective absorber.
Peluruhan Batang Graphite Baterai Bekas Dengan Metode Electrochemical Expoliation Menggunakan Pelarut Asam Sulfat Dan Sodium Sulfat Untuk Produksi Graphene Azhari Harahap; Amun Amri; Syelvia Putri Utami
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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Graphene is two dimensional material (2D) consisting of carbon atoms with a flat lattice configuration in a flexible hexagonal pattern. One of the materials that can be used as raw material in graphene synthesis is carbon used battery bar. The purpose of this research was to synthesize graphene using electrochemical exfoliation graphite (EEG) method and to study the process of exfoliation rate over 30, 60, 90, 120 and 150 minutes for 2.5 hours. Graphene was synthesized by using two solvents H2SO4 and Na2SO4 with varied concentrations of : 0.25 M, 0.5 M, 0.75 M and 1 M. From the synthesis results, the best exfoliation rate and the best yields were shown by Na2SO4 solvent at 1 M concentration with a yield of 21.83%. From the graphene conductivity test, the best conductivity was obtained by Na2SO4 solvent at 1 M concentration with conductivity value of 0,1698 Ω-1.cm-1.Key words : Electrochemical exfoliation graphite, graphene, graphite.
Pengaruh Konsentrasi Dan Rasio Berat Few Layer Graphene (FLG) Terhadap Sifat Mekanis Aspal Beton Jenis Asphalt Treated Base (ATB) Muhammad Sugandi; Amun Amri; Syelvia Putri Utami; Muhammad Shalahuddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Developing in highway is needed to produce better mechanical properties. This study aims to produce concrete asphalt by adding FLG (Few-Layer Graphene) from graphite, and then comparing the contribution of graphene with concentration and weight ratio of FLG to concrete asphalt as variations. Making asphalt concrete-FLG composite was started from making FLG with concentrations of 10, and 20 mg/ml using the turbulence-assisted shear exfoliation (TASE) method. Then, FLG was added to the bitumen with these variations and mixing it at 150 ᴼC and stirred for 10 minutes for homogenize. The homogenized asphalt bitumen was then mixed with the aggregates that have been prepared using a filter analyzer. The united bitumen and aggregates were then compacted using Marshall Automatic Compactor (MAC) with the number of collisions as much as 112 times and soaked in a water bath for 24 hours at 25 ᴼC. After 24 hours, the Marshall object test was weighed and soaked again for 30 minutes at 60 ᴼC before Marshall’s test. The results showed that for bitumen asphalt, the best penetration was exhibited by sample synthesized using FLG with concentrations of 20 mg/ml and 9% wt, namely 48.1 dmm. For Marshall’s test, the best flow value was also exhibited by the sample with FLG concentrations of 20 mg/ml and 9% wt, namely 4.3 mm. FTIR testing showed that there was an interaction between the FLG and bitumen in the double bond region and single bond stretch.Keywords : asphalt, few-layer graphene, flow, penetrations, softening point, stability
Kinetika Reaksi Deasetalisasi Sintesa Kitosan Dengan Pendekatan Shrinking Core Model (SCM) Annisa Rahmat; Ahmad Fadli; Amun Amri
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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Chitosan is poly (2-amino-2-deoxy-β- (1-4) -D-glucopyranose) with molecular (C8H11NO4)n which produced from chitin of ebi waste through deacetylation process. Chitosan can be synthesized from ebi waste using chemical methods through deproteinasi, demineralization and deacetylation. Research procedure was begining with the size reduction of ebi waste into powder size. Then the powder was treated with NaOH 3.5% (deproteinasi), the ratio of deproteinasi 1:10 (w / v) for 2 hours and the stirring speed of 150 rpm. Deproteinasi product was treated with HCl 1 N (demineralization), the ratio of demineralization 1:15 (w / v) for 1 h and the stirring speed of 150 rpm. Demineralised product was reacted using 50% NaOH (deacetylation), the ratio of deacetylation 1:25 (w / v) at a speed of 100.150 stirring, and 200 rpm with a temperature of 120 ° C for 2 hours. Samples were taken every 10 minutes rise as much as 10 mL, washed until pH neutral and dried. Deacetylation degree of chitosan analyzed using acid-base titration method. By the range between in the stirring speed of 100-200 rpm it proved that the faster some mixing the bigger it is of deacetylation of chitosan is between 74,54%-83,14%. Reaction kinetics model suitable to describe the events that occur in the synthesis of chitosan was a model that was a layer 2 results (chitosan) to control.Keywords: deacetylation, reaction kinetics, chitosan, waste ebi, shrinking core model.
Co-Authors AA Sudharmawan, AA Abdul Rasyid Amrin Abid, Hussein Rasool Achmad Noerkhaerin Putra Adrianto Ahmad Affandi Affandi Ahmad Fadli Ahmad Fadli Ahmad Fadli Aisyah Dewi Ranti, Aisyah Dewi Akbar, Irfan Sarhadi Alfarizi, Cory Dian Ali Novia Altarawneh, Mohammednoor Aman Aman Aman aman Aman, Azka Aminati, Ikha Setya Amir Awaluddin Amri, Evelyn Andrizal Andrizal Ani Suryani Anjani, Putri Annisa Rahmat Apriadi Rio Ari Sandhyavitri Arisman Adnan Assylzhan, Mazhibayev Azhar, Muhammad Rizwan Azhari Harahap Azridjal Aziz Bahri, Ahmad Syaiful Bahruddin Bahruddin Bahruddin Bahruddin Bahruddin Benny Ahmadi Bona Tua Chairul Chairul Chairul Damayanti, Elok Deden Saprudin Dedeng Hermoyo Derry Hanriansyah Pratama Desi Heltina Dhini Octavianty Dimas Nofriyan Dwi Setyo Pambudi, Yoyok Ekawati, Lestari Elmira, Kambarova Erliza Hambali Esty Octiana Sari Esty Octiana Sari Eva Rantika Evelyn Evelyn Evelyn Evelyn Evelyn Evi Nadhifah Fabryza, Dhina Fajar Restuhadi Fajrina Qaishum Fakhri, Fakhri Fauziyah, Hidayatul Febri Riandi Febrizal Ujang Febryza, Dhina Feby Pratama Nugraha Fesya Putri, Andini Firman syah Fitri, Lara Ismano Fitria, Anisa Fri Murdiya, Fri Gilang Fathurrahman Gilda Miranda Gussyafri Hasnul Bustaman Hawa, Karfika Ainil Hawa, Karfika Ainil Hendri, Yola Bertilsya Hendro Ekwarso Heni Sugesti Heri Rahmana Indra Yasri Irwan Irwan Is Sulistyati Isna Rahma Dini Iwantono Iwan Barnawi Jhon Armedi Pinem Jiang, Zhong Tao Jumbri, Khairulazhar Karfika Ainil Hawa Khairat Khairat Khairat Khusnul Ain Komalasari Komalasari Komalasari Komalasari Lisa Legawati Lucy Rahmawati M. Fauzan Akbar M. Iwan Fermi Malindo, Muhammad Eri MAYANG SARI Mayangsari Mayangsari Meliagustin, Adilla Michael Hutapea Miran, Hussein A. Mochamad Reizal Ath Thariq Monita Olivia Muhamamad Rizky Zuriadi Muhammad Shalahuddin Muhammad Shalahuddin Muhammad Sugandi Muhammad Zaqi Muhdarina Nisa Mulya Novan, Andre Novia Azzahra Nurhayati Nurwijayanti Nurwulandari Saputri Ohi, Hiroshi Oktariandi, Vito Paul Destin Purba Peratenta Sembiring, Maria Perdana, Rendy Putra Peter Peter Prawiranegara, Barata Aditya Puji Rahmawati Dwi Sukma Putra, Rahmat Ade Putri Arini Putri Husni Hidayah, Putri Husni Putri, Diana Eka Rahayu, Ricky Puji Rahmadahana, Suci Rahman, M. Mahbubur Rahmansyah Rahmansyah Rahmat Kurniawan Nasution Rahmi, Sri Wahdini Ramadhan Ramadhan Rani Handayani Reni Yenti, Silvia Reski, M. Rifati Hanifa Rino Rinaldi Rizka Aulia Hardi, Rizka Aulia Rizky, Muhammad Dian Rozanna Sri Irianty Russita Martani Russita Martani Rusydy ' Salma Liska Saputra, Adika Saputra, Fakhri Sari Rahma Yanti Sari, Esty Octiana Sarma, Deki Septian, Handika Setia Utama, Panca Setiani Br Manurung Silvia Reni Yenti Silvia Reni Yenti Suci Afrianti Sukoco Sukoco Sukoco Sukoco Sunarno SUNARNO Sunarno Sunarno SYAIFUL BAHRI Syamsu Herman Syelvia Putri Utami Syukri Hamdani Tafrikhatul Walidah Tao Jiang, Zhong Utama, Panca Setia Voadi, Salsabilla Diva Wilda Zakiah Windy Odelia Putri Wira Irawan Rossani Wisrayetti Wisrayetti Wisrayetti Wisrayetti Wisrayetti, Wisrayetti Wulandari, Revika Yang, Chun-Chen Yelmida Azis Yolanda, Yogi Yopalim Zanstra Yosi Alwinda Yosi Alwinda, Yosi Yusnimar Sahan Z Zulfansyah Zikri, Ahmed Zuchra Helwani, Zuchra Zultiniar Zultiniar Zultiniar Zultiniar Zultiniar Zultiniar Zultiniar, Zultiniar Zuqni Meldha