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Pirolisis Kayu Akasia Menjadi Bio-Oil Menggunakan Katalis NiMo/NZA Dengan Variasi Jumlah Pengembanan Logam Dan Rasio Berat Katalis Terhadap Biomassa Saputra, Adika; Bahri, Syaiful; Amri, Amun
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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Abstract

The purpose of this research is to determine the effect of the percentage of NiMo and ratio of NiMo/NZA catalyst to the yield of bio-oil in the synthesis of bio-oil from acacia wood using pyrolysis methode. The process was carried out using 50 gram, of acacia wood, 500 ml silinap and NiMo/NZA catalyst with various variations of the percentage of NiMo metal 0%, 1%, 2%, 3% and the variation ratio of NiMo/NZA catalyst 3%, 6%, 12% respectively of the biomass having a stirring speed of 300 rpm and a temperature of 320 ºC for 120 minutes. From the result, the highest yield (69.41%) was obtained of NiMo ratio 2% and the catalyst 3%. The physical properties at the bio-oil result obtained density 0.938 gr/ml, viscosity 1.919 cSt, acid number 87.593 mg NaOH/gr sample, and the flash point 55 oC respectively. From analysis by the GC-MS, the dominant components were 2-Pentene,2,4,4-Trimethyl (18.50%), Pentane,2,2,4,4-Tetramethyl- (5.64%), 1-Pentene,2,4,4-Trimethyl- (10.31%), 2-Pentene,2,3, 4-Trimethyl- (2.43%) and Cyclohexanone,3-(3,3-Dimethylbutyl) (8.08%) were found.Keywords: Biomass, Bio-oil, NiMo/NZA, acacia wood, Pyrolysis
The performance of surface barrier discharge in magnetic field driven by half bridge series resonance converter Fri Murdiya; Febrizal Febrizal; Amun Amri
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 8, No 2 (2017)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2017.v8.95-102

Abstract

This paper reports an application of a series resonance converter as a high voltage generator to drive a surface barrier discharge with a magnetic field. The high voltage was about 5 kV with the frequency of 25 kHz. It was connected to circular aluminum plates as the anode electrode and a rectangular aluminum plate as the cathode electrode. These electrodes were separated by a glass dielectric as the barrier. The experiment result indicated that the discharge current with magnetic field was lower than without magnetic field. The plasma on the surface barrier with magnetic field was more luminous than without magnetic field. It also indicated that the area of Lissajous diagram for the surface barrier discharge with magnetic field was slightly decreased than without magnetic field. It could be concluded that the magnetic field affects the plasma progress on the surface barrier. Molecular dynamic (MD) could be used in understanding the ionization process of air molecules. The ionization energies for CO2, N2, and O2 were 0.0502 kcal/mol, 0.0526 kcal/mol and 0.430 kcal/mol, respectively in 1,000 seconds. The highest ionization energy was O2.
THE 3 HOURS-HYDROTHERMAL SYNTHESIS OF HIGH SURFACE AREA SUPERPARAMAGNETIC Fe3O4 CORE-SHELL NANOPARTICLES Esty Octiana Sari; Ahmad Fadli; Amun Amri
Jurnal Sains Materi Indonesia Vol 19, No 1: OKTOBER 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2017.19.1.4111

Abstract

The monodisperse core-shell Fe3O4 nanoparticles have been successfully synthesized by short times (3 hours) hydrothermal method at 220oC from FeCl3, citrate, urea and PEG. The as-synthesized samples have been characterized using X-ray diffraction (XRD), Transmission Electron Mycroscopy (TEM), Bruneur-Emmet-Teller (BET) surface area analyzer, and Vibrating Sample Magnetometer (VSM). The XRD result showed the as-shinthesized products were pure Fe3O4.  The TEM image showed the magnetite nanoparticles have monodisperse core-shell shape. The BET result showed the magnetite nanoparticles have 650.757 m2/g surface area. The hysteresis curve showed the magnetite nanoparticles exhibit superparamagnetic properties. This simple method obtained 60 nm core-shell Fe3O4 particles with superparamagnetic, high surface area as well as hydrophylic properties. Those properties are promising for various biomedical application. The advantages of simple and short times methods with high quality of product make this method very promising to be applied.
MODELING, VARIABLES INFLUENCE AND OPTIMIZATION USING RESPONSE SURFACE METHOD – CENTRAL COMPOSITE DESIGN (RSM-CCD) ON THE SODIUM LIGNOSULFONATE PRODUCTION FROM Amun Amri; Zulfansyah Zulfansyah; M. Iwan Fermi; Is Sulistyati; Ani Suryani; Erliza Hambali
Reaktor Volume 12, Nomor 3, Juni 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (291.811 KB) | DOI: 10.14710/reaktor.12.3.183 – 188

Abstract

The sodium lignosulfonate (SLS) is a derivative compound from lignin which has various usefulness. Commercial SLS is a by-product of Arbiso pulping sulfite industry, but nowadays, the amount of available commercial SLS is scare due to the expensive price of SLS. Therefore, it is needed to find the solution to produce of SLS using a feasible process. This research involves producing SLS by directly cooking the palm oil stem biomass dust in a pressurized reactor using sodium bi-sulfite (NaHSO3) solvent. The experiment focused on the modeling, influence of process variables and its optimization that statistically analyze using the Response Surface Method-Central Composite Design (RSM-CCD). The result showed that the solid-liquid ratio is the most affecting factor to the SLS rendemen. The relation between rendemen and temperature (T), pH (C) and solid-liquid ratio (R) can be modeled as % rendemen = 12.18 + 0.52T – 0.48C + 3.5R – 1.02T2 – C2 – 1.53R2. The optimal operation conditions were identified at temperature of 153.8oC, pH = 4.64 and solid-liquid ratio of 1:15.9.
SIMULASI GASIFIKASI SLUDGE LIMBAH INDUSTRI PULP DAN KERTAS Rusydy '; Amun Amri; Ahmad Fadli
Jurnal Sains dan Teknologi Vol 14, No 2 (2015): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (217.729 KB) | DOI: 10.31258/jst.v14.n2.p%p

Abstract

Industri pulp dan kertas menghasilkan limbah padat sekitar 3%-4% dari total produksi, sebagian besar berupa lumpur (sludge). Salah satu teknologi pengolahan sludge adalah proses gasifikasi sludge menjadi syngas. Faktor-faktor yang mempengaruhi proses gasifikasi sludge dipelajari dengan melakukan simulasi proses gasifikasi sludge dalam fluidized bed gasifier menggunakan software Aspen Plus V8.0. Konfigurasi proses disusun berupa sistem gasifikasi fluidized bed dengan umpan sludge menggunakan agen gasifikasi O2 dan steam. Beberapa tahap dipertimbangkan untuk menunjukkan seluruh proses gasifikasi, yaitu dekomposisi sludge, pembakaran zat yang mudah menguap, gasifikasi char, dan pemisahan gas-padatan. Digunakan sludge dengan nilai ultimate (basis kering): 48,0% C; 5,7% H; 36,3% O; 0,8% S; 1,2% N; dan proximate (basis kering); kadar air 40,90%; abu 8,70%; Volatile Matter 52,1%; Fixed Carbon 41,82%; LHV 9,5 MJ/kg. Variabel penelitian: temperatur reaktor 600-800oC, ER 0,20-0,35 kg/kg, S/B 0,20-0,35 kg/kg dan variabel tetap: tekanan operasi 1 atm dan laju alir sludge 100 kg/menit. Temperatur reaktor, Equivalent Ratio (ER), Perbandingan Steam/Sludge (S/B) adalah faktor-faktor yang sangat berpengaruh dalam proses gasifikasi sludge. Peningkatan temperatur menyebabkan konsentrasi hidrogen dalam syngas meningkat pesat (24,84-35,19%) dan mengurangi konversi CO (17,07-15,45%). Peningkatan ER mengurangi konversi syngas -15,85% dan meningkatkan persentase CO2 (26,40-35,99%), ER optimal antara 0,2-0,3. Ratio steam-sludge tinggi dapat mengurangi suhu reaktor yang berefek pada laju gasifikasi, S/B optimum antara 0,20-0,25.
PREPARASI KOATING TiO2 PADA DYE-SENSITIZED SOLAR CELL (DSSC) BERBASIS MELASTOMA MALABATHRICUM Amun Amri; Arinil Haq; Ahmad Fadli; Indra Yasri
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 (496.44 KB) | DOI: 10.31258/jst.v16.n1.p7-12

Abstract

Salah satu solusi terhadap masalah krisis energi adalah optimalisasi pemanfaatan energy matahari sebagai sumber ener-gi alternatif. Dye-sensitized solar cell (DSSC) adalah sel surya yang memanfaatkan zat warna (dye) sebagai pengikat cahaya matahari sekaligus sebagai sensitizer-nya untuk menghasilkan listrik DC. Penelitian ini bertujuan menguji penggunaan ekstrak buah Senduduk sebagai bahan zat warna dalam DSSC dan mempelajari pengaruh fraksi/konsentrasi etanol pada proses penyiapan koating TiO2 dalam DSSC dan ketebalannya terhadap kinerja DSSC. Zat warna diekstrak dengan melarutkan buah Senduduk dalam campuran pelarut metanol - asam asetat - aquades. Pasta TiO2 dibuat dengan mencampurkan 5 g TiO2 ke dalam 40 ml pelarut ethanol-air dengan berbagai variasi konsentrasi/fraksi. Selanjutnya TiO2 dideposisikan pada substrat kaca fluorine tin oxide (FTO) menggunakan spin coater dengan variasi ketebalan yang selanjutnya disintering membentuk elektroda kerja. Elektroda lawan (counter-electrode) yang sekaligus sebagai katalis dibuat menggunakan lapisan karbon. Uji UV-Vis menunjukkan bahwa ekstrak buah Senduduk mengandung senyawa antosianin sebagai media sensitizer. Semakin besar fraksi etanol dalam pelarut pasta TiO2 dan semakin tebal koating TiO2, maka semakin tinggi tegangan listrik yang dihasilkan. Tegangan tertinggi ditunjukkan oleh DSSC dengan koating yang disintesis menggunakan etanol tanpa pengenceran yaitu sebesar 659 mV/cm2 (pencahayaan LED), dan sebesar 1806,7 mV/cm2 (pencahayaan matahari langsung). Uji morfologi menunjukkan peningkatan fraksi etanol pada preparasi pasta TiO2 mempengaruhi morfologi permukaan koating yang bermuara pada peningkatan kinerja DSSC. Peningkatan fraksi etanol juga meningkatkan daya adhesi koating TiO2 pada substrat.
Hidrolisis Mikroalga Tetraselmis chuii Dengan Variasi Konsentrasi Asam Sulfat Dan Temperatur Gilda Miranda; Amun Amri; Syelvia Putri Utami
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

Glucose is a monosaccharide which can be used as an energy source in bio-battery, to produce intermediate products (hydroxymethylfurfural, furfural, levulinic acid, and formic acid), and can be converted into bioethanol. Glucose is a sugar monomer produced after hydrolysis of cellulose and hemicellulose chains in land plants and water plants. Microalgae is a water plant that has a big potential to be converted into glucose. It has been known to use light and various carbon sources to produce carbohydrate. Tetraselmis chuii is a green microalgae, containing a large number of carbohydrate, fat, protein, vitamin, and mineral. As a green microalgae, Tetraselmis chuii has a cellulose and hemicellulose components in its cell wall without a lignin content. This research focused on the hydrolysis of microalgae using variation of sulphuric acid concentration and temperature as variables to produce glucose. Microalgae feedstock was mixed with different concentrations of sulphuric acid between 0.25-1.75% (v/v). Hydrolysis process was conducted under low temperatures at 60 and 70 oC for 30 minutes. The glucose was analyzed quantitatively using Spectrophotometer UV-Vis. The results showed that the highest glucose yield obtained was 48,40% and this was achieved when the hydrolysis occurred at 70 oC with 1.75% (v/v) sulphuric acid addition. This study revealed that the temperature and the sulphuric acid concentration are the important factors during acid hydrolysis of microalgae for glucose production.  Keywords : glucose, dilute sulphuric acid, hydrolysis, temperature, Tetraselmis chuii.
Pemurnian Bioetanol Hasil Fermentasi Nira Nipah Dengan Proses Distilasi-Adsorpsi Menggunakan Bentonit Teraktivas Tafrikhatul Walidah; Chairul Chairul; Amun Amri
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

Indonesia has petroleum reserves about 9 billion barrels, which the average production rate is 0.5 billion barrels per year, and was predicted would be exhaust within 18 years. Government has ordered a program and policy to develop bioethanol and biodiesel for the energy crisis in Indonesia. It is targeted can be provide about 15-20% of the fuel for transportation and national industry in 2025. This research’s goals were to produce fuel grade ethanol by distillation-adsorption method, determined the effect of activation temperature of bentonite and the effect ratio of bentonite to bioethanol. The raw materials were bioethanol from nypa sap (8% ethanol content). The ethanol concentration was not too high, so it needed to improve its purity by distillation-adsorption process. The research was held in three phases, which were distillation of nypa sap’s bioethanol to 96% ethanol content, activation of bentonite, and distillation-adsorption using activated bentonite. Activation temperature of bentonite were 400oC, 500oC and the ratio of bentonite:bioethanol were 1:2; 1:3; and 1:4. The most effective process for the purification of bioethanol was distillation-adsorption at 500oC activated temperature and the ratio of bentonite:bioethanol was 1:2 with the purity is 99.5% and has been categorized as a fuel grade ethanolKeywords: bentonite, bioethanol, distillation-adsorption, fuel grade bioethanol, nypa sap
Model Shrinking Core Pada Isolasi Kitosan Dari Limbah Ebi Rani Handayani; Ahmad Fadli; Amun Amri
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

Chitosan is derived from chitin compound used in the biomedical field. Chitosan can be synthesized from ebi waste using chemical methods through the deproteination, demineralization and the deacetylation processes. The aims of this study are to determine the effect of NaOH concentration on the degree of deacetylation chitosan synthesis and to determine the model that can describe the kinetics reaction via Shrinking Core Model (SCM) approach. The procedure of research was started by ebi waste size reduction. Ebi powder was reacted with NaOH 3.5% (deproteination), ratio 1:10 (w/v) for 2 hours stirring by 150 rpm. The deproteination product was reacted with HCl 1 N (demineralization), ratio 1:15 (w/v) for 1 hour stirring by 150 rpm. Then the product was reacted using NaOH 40%, 50%, and 60% (deacetylation), ratio 1:20 (w/v) at a temperature of 120oC with stirring by 150 rpm for 2 hours. Samples were taken every 10 minutes rise as much as 10 mL, washed until pH neutral and it dried. Deacetylation degree of chitosan was analyzed using acid-base titration method. The results showed that the higher the concentration, the higher the degree of deacetylation of the chitosan will be namely 72.63% to 79.32% at a temperature of 120oC. The best reaction kinetics model to describe the occur in the synthesize of chitosan was a model 2, that was a layer (chitosan) to control with the equation as:Model 2 is the best kinetic’s model with shrinking reacted core model on synthesize of citosan and ebi waste.Keywords: deacetylation, reaction kinetics, chitosan, waste ebi, shrinkingcore model.
Pengaruh Tegangan Listrik Dan Waktu Pelapisan Hidroksiapatit Pada Logam 316L Dengan Metode Elektroforesis Deposisi (EPD) Mayang Sari; Ahmad Fadli; 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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Abstract

Stainless steel 316L is a metal which used to bone plate, this metal has low biocompatibility in a human body. The stainless steel 316L need to be coated by HA for increased their biocompatibility. The purpose of this research is to learn the effect of applied voltage and deposition time, then characterize HA coated 316L stainless steel. Stainless steel 316L put into alcohol and water solution for 1 hour. The HA powder was deposited by electrophoretic deposition (EPD) using carbon as anode and stainless steel 316L as cathode. It was observed from SEM analysis that HA deposited on stainless steel increased with higher voltage, thickness of HA layer on stainless steel was 30 μm, 45 μm and 55 μm for deposition 17 minutes and applied voltage 40, 60 and 80 volt. Thickness of HA layer on substrate increased, as the time deposition increased with result 30 μm dan 55 μm at deposition 80 volt and deposition time 2 and 17 minutes. HA coatings at applied voltage 80 volt and deposition time 17 minutes was obtained suitable for bone plate.Keywords : Coating, Electrophoretic Deposition, Hydroxyapatite, Stainless Steel 316L
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