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All Journal Jurnal Sains dan Teknologi Jurnal Teknik Kimia USU Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of Engineering and Technological Sciences JURNAL INTEGRASI PROSES Konversi KURVATEK Jurnal UNITEK Narra J Journal of Bioprocess Chemical and Environmental Engineering Science Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Jurnal Teknik Kimia USU Bhakti Nagori (Jurnal Pengabdian kepada Masyarakat) Jurnal Pengabdian Masyarakat Bidang Sains dan Teknologi Jurnal Offshore: Oil, Production Facilities, and Renewable Energy LAVOISIER: Chemistry Education Journal Heca Journal of Applied Sciences Malacca Pharmaceutics Leuser Journal of Environmental Studies Infolitika Journal of Data Science LAVOISIER: Chemistry Education Journal JURNAL REKAYASA KIMIA & LINGKUNGAN
Zuchra Helwani
Universitas Riau
Aerospace Engineering Agriculture, Biological Sciences & Forestry 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 Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Transportation Veterinary Other

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Pengaruh Kondisi Proses Terhadap Kuat Tarik Pulp Pada Pembuatan Pulp Rumput Perimping Dengan Pelarut Organik Asam Formiat Edi Susanto; Zuchra Helwani; Zulfansyah Zulfansyah
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

Perimping grass is one of lignocellulosic material which has not been fully utilized, so it is potential to be used as raw material for pulping which will provide economic value added. Organosolv pulping is the process of pulp making using organic solution. The objectives of this research is to study effect of the process conditions on tensile index. Effect of the process conditions were studied by Response Surface Methodology (RSM) with Central Composite Design (CCD). The experiment pulping is carried out at the boiling temperature of liquor at atmospheric pressure, with 40 grams of perimping grass using formic acid (concentrations of 60%, 70%, and 80%), reaction time (60 minutes, 120 minutes, and 180 minutes), liquid to solid ratio (10/1, 15/1 , And 20/1 b/b), with HCl catalyst 0.1% wt. The result pulp of the perimping grass for tensile index is 659.3-2.1149 N m/g. The variable interaction (concentration of formic acid and reaction time) is a significant factor to the pulp tensile index.Keywords: formic acid, organosolv pulping, perimping grass, RSM, tensile index
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
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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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.
Modifikasi Kulit Telur Ayam Dan Serbuk Besi Sebagai Katalis untuk Reaksi Transesterifikasi Minyak Sawit Off Grade Menjadi Biodiesel Delvi Yolanda; Zuchra Helwani; Edy Saputra
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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Abstract

Eggshells modificated of solid base catalyst through calcination, hydration, dehydration methods with iron powder through impregnation method to load calcium oxide with eggshells as precursor. Effect of dehydration temperature and time on the catalytic performance were studied. The catalyst with the highest activity is obtained when the dehydration temperature of 600 °C and the dehydration time of 2 hours under transesterification reaction conditions of a molar ratio of methanol/oil 10:1, catalyst dosage of 1% by weight, temperature of 70 °C for 2 hours with yield biodiesel results reached 90%.Keywords: biodiesel, calcination, calcium oxide, catalysts, dehydration, hydration, impregnation, iron powder, transesterification.
Modifikasi Kulit Telur Puyuh Dan Serbuk Besi Menjadi Katalis CaO/Serbuk Besi Untuk Reaksi Transesterifikasi Minyak Sawit Off Grade Produksi Biodiesel Vandhe Melsa Sembiring; Zuchra Helwani; Rozanna Sri Irianty
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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Biodiesel can be synthesized from palm oil off grade using a CaO / iron powder catalyst in the transesterification stage. This study aims to produce biodiesel from low-quality raw materials and determine the effect of the process by looking at the effect of process conditions such as dehydration temperature and dehydration temperature on biodiesel yield. The process of making biodiesel is carried out by esterification and transesterification reactions. The catalyst with the highest catalytic activity was obtained at a dehydration temperature of 600°C and dehydration time for 3 hours with the condition of the transesterification reaction at 10:1 molar ratio of methanol/oil, catalyst concentration of 1% -b oil, reaction temperature of 70° C for 2 hours with yield biodiesel reached 90%. Keywords: biodiesel, CaO, off grade palm oil, iron powder, transesterification.
Pembuatan Biodiesel Dari Minyak Nyamplung (Calophyllum Inophyllum) Menggunakan Katalis Geopolimer: Pengaruh Temperatur Dan Rasio Mol Minyak:Metanol Mohd Fajri Amrullah; Edy Saputra; Zuchra Helwani
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

Biodiesel is an alternative energy to replace fossil fuels. It can be made by transesterification process of vegetable oils. Process of making biodiesel commonly use NaOH or KOH as homogeneous catalyst which has the disadvantage the formation of by products such as soaps and the complexity of the separation of catalyst. Therefore, in this study biodiesel was synthesized from calophyllum inophyllum oil by using geopolymer catalyst. Geopolymer was synthesized by mixing sodium silicate, metakaolin, NaOH, and water. Several variations of the process variables were done to assess its influence on yield of biodiesel. The variables were used consist of a dependent variables and independent variables. The dependent variables were calophyllum inophyllum oil weight of 50 grams, 3%-wt of catalyst concentration, reaction time of 120 minutes, and stirring speed of 400 rpm, while the independent variables which variation molar ratio of oil:methanol 1:3, 1:6, 1:9, 1:12 and variations of temperature 55, 60, 65 oC. Physical characterization were done including density 873 kg/m3, kinematic viscosity 4.46 mm2/s, acid number 0.49 mg-KOH/g biodiesel and flash point 140°C respectively accordance with the standards of Indonesian biodiesel (SNI 7182:2015).Keywords: biodiesel, catalyst, calophyllum inophyllum oil, geopolymer, yield
Optimasi Proses Produksi Biodiesel Dari Sawit Off Grade Menggunakan Katalis Zeolit Alam Teraktivasi Pada Tahap Transesterifikasi Heriza Saputri; Zuchra Helwani; Hari Rionaldo
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

Oil-palm off grade is a source of vegetable oil that unmaximum utilization from the rest of the sorting in Crude Palm Oil (CPO) factory. The availability of oil-palm off grade is about 7-10% of a CPO factory with capacity of 30 tons per hour. This research aims to produce biodiesel from oil-palm off grade with two-stage reaction (esterification and transesterification) using activated natural zeolite catalysts in transesterification reaction. The other aims of this research is to study the influence of the reaction temperature (50, 60, 70°C), the molar ratio methanol : oil (6:1, 8:1, 10:1), and catalyst concentration (1, 3, 5%-wt) to yield of biodiesel and also to predict the optimum of proccess condition that give maximum yield. Natural zeolite is modificated by impregnation with 75% KOH solution and calcined at 450°C for 4 hours. The highest yield of biodiesel is 92,04% at the reaction temperature of 60°C, the molar ratio of methanol : oil 8:1, and 3%-wt catalyst concentration.Keywords : oil-palm off grade, biodiesel, natural zeolite modificated, response surface methodology, transesterification
Pembuatan Dan Karakterisasi Komposit Hybrid Serat Pelepah Pisang Kepok (Musa Paradisiaca) Dengan Serat Tandan Kosong Sawit Bermatriks Epoxy Muhammad Gus Iqbal Al-Pakningi; Warman Fatra; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The Empty Fruits Bunches (EFB) is quite good mechanical properties, which it is waste that has not been utilized  and easily broken down. The problem in previous studies was of voids on the surface and in the composite due to the lack of a percentage of the matrix, resulting in a weak interface bond resulting in low mechanical properties. This research uses banana leaf fiber in hybrid with EFB fiber and epoxy matrix then produced by vacuum bagging method. The banana fiber was extracted with a length of 25 cm and EFB fibers a length of 1, 2, and 3 cm and alkaline treatment using 5% NaOH with a soaking time of 2 hours. For The experimental design and variables that have a significant effect on flexural strength, impact resistance, and water absorption, the statistical method Response Surface Methodology (RSM) is used. The results showed that the maximum flexural strength was at running 6 with a value of 209.11 MPa, with a percentage of banana fiber/EFB (50%: 50%) with a percentage of hybrid/matrix fibers (30%: 70%) and 30 mm EFB fiber length. The maximum impact strength is at running 9 with a value of 2.736 Joules, percentage of banana fiber/EFB (60%: 40%) percentage of hybrid/matrix fibers (35%: 65%), and a fiber length of 3 cm EFB. The minimum water absorption is at running 14 with a value of 0.22%, percentage of banana fiber/EFB (60%:40%) with a percentage of hybrid/matrix fibers (25%: 75%), and a length of 1 cm EFB fiber Keywords: Banana Fiber, EFB, Hybrid composites, Vacuum Bagging, Response Surface Methodology (RSM)
Esterifikasi Gliserol Dari Produk Samping Biodiesel Menjadi Triasetin Menggunakan Katalis Zeolit Alam Nirmala Sari; Zuchra Helwani; Hari Rionaldo
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

Glycerol is a by-product of biodiesel production from transesterification reaction generated 10% volume product. The increase of biodiesel production is followed by the increase of the glycerol as by product. Glycerol when esterified with acetic acid formed Triacetin. Triacetin has many uses for food, non-food and additives in biofuel feedstock that is renewable and environmentally friendly. In this study will be make Triacetin from reaction esterification of crude glycerol purified with acetic acid glacial and using natural zeolite catalyst has been activated. Making triacetin performed with a three-neck flask equipped with a condenser, heating mantle, thermometer and magnetic stirred at 100 ° C, 100 mesh size catalyst and reaction time for 4 hours. Process of qualitative analysis using FT-IR instrument has detected the exixtence of Triacetin product. The variables are varied ratio reactant of glycerol and acetic acid, and the concentration catalyst. The highest conversion obtained for 90.02% in reactan ratio mol glycerol and acetic acid 1: 7, catalyst concentration of 3% to weight of acetic acid. Comparison of reagents give real effect to the conversion of glycerol into Triacetin, while the catalyst concentration does not give a significant effect on glycerol conversion be Triacetin.Keywords: acetic acid, esterification, glycerol, Triacetin
Aplikasi Re-Used Katalis Pada Sintesis Emulsifier Ricfan Anggriawan; Ida Zahrina; Zuchra Helwani
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

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Abstract

Mono and diglycerides (MDAG) are a group of synthetic emulsifiers usually used for food emulsion. MDAG can be obtained by the esterification process of fatty acids and glycerol with Deep Eutectic Solvents (DES) as a catalyst. The re-used catalyst method is one of many methods to determine the effectiveness of DES as a catalyst in the esterification process. DES is a mixture of at least two components, there are Hydrogen Bond Acceptors (HBA) and Hydrogen Bond Donors (HBD) which form eutectic phases with a melting point is lower than the constituent component. Re-used catalyst DES was tested in optimum condition with temperature 150°C, 30 minutes reaction time, 5 wt% catalyst, with 6:1 ratio mol between glycerol and oleic acid, and the conversion is 95%. The result of 5 times re-used catalyst is the conversion has got a not too significant reduction, which indicates that the phosphonium-based DES catalyst has a strong resistance to maintaining high catalyst activity in the esterification process. Keywords: esterification, catalyst, DES, Emulsifier, re-used catalyst.
Penggunaan Zeolit Alam Teraktivasi Sebagai Katalis Pada Proses Esterifikasi Gliserol Dari Produk Samping Biodiesel Menjadi Triacetin Dwi Yuni Ernawati; Zuchra Helwani; Silvia Reni Yenti
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

Glycerol is a byproduct of biodiesel production by transesterification process which generated approximately 10% of the total production of biodiesel. Increasing the amount of glycerol is not accompanied by glycerol treatment process itself. Hence the need for the processing of glycerol into other materials or products that are more economic value. One of them with the process into triacetin. Triacetin can be produced from the reaction of glycerol and acetic acid using an acidic catalyst. Triacetin usefulness pretty much both for food and non-food. The objective of this study was to study the effect of ratio of reactant and consentration of catalyst on glycerol conversion on triacetin. This research was conducted with the reactants ratio 1: 3; 1: 5 and 1: 7, catalyst concentration of 2%, 4%, and 6% of the weight of acetic acid, reaction temperature of 100 °C and reaction time of 4 hours. From the analysis of the results showed that the increase in ratio of esterification of the reactants and catalyst concentration affect the conversion of glycerol into triacetin. The optimal reaction conditions on the reactant ratio of 1: 7 and the concentration of catalyst 4% of the weight of acetic acid with 82.89% conversion rate.Kata kunci: asam asetat, gliserol, optimum, reaktan, triacetin.
Co-Authors Abd , Ammar Ali Abd Rahman, Sunarti Abdullah Syafi’i Adi Maulana Putra Adrianto Ahmad Afriyenti, Mia Agustiyanti, Rini Dwi Agustiyanti, Rini Dwi Ahmad Fadli Ahmad Fadli Ahmad, Khairunnas Ahmudi, Ali Al Qohyum Fernando Amir Awaluddin Amun Amri Andi Mulya Adha Andreas Sahat Parsaulian Andry Sutanto Anggraini, Diva Putri Anggriani, Rara Dewi Anna Apryana Anuar, Kaspul Ari Wibowo Harahap Arief Maulana Ilham Arini Puspita Ramadhanti Arya Wiranata Asal Felix Mandrofa Asep Rusyana Aswie, Viqha Ayu Naluri Bahruddin Bahruddin Bettry Rifani Boy M Bachtiar Boy M. Bachtiar Damayanti, Elok David Andrio Dedi Meier Silaban Delvi Yolanda Desi Ivo Andri Ari Desly Fadilla Simbolon Dhani Nur Miftahudin Diana S. Ningsih Dizikri, Dizikri Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati Dwi Septiana Dwi Yuni Ernawati Edi Susanto Edy Saputra Eferius Mendrofa Eko Suhartono Emran, Talha Bin Evionitra, Azzahra Uthami Fachry Abda El Rahman Febrian Adhitya Febrina Dwi Putri Febrina Dwi Putri, Febrina Dwi Febrina, Wetri Febryanto Febryanto Fernando, Rivo Firman Tampubolon Fitra Annisa Ganis Kharisma Wiranti Ghazi M. Idroes Ghazi Mauer Idroes Gusti Ayu Nurjanah Hafiz, Fadlillahi Hamsar Hamsar Hanafi, Muhammad Rifter Hari Rionaldo Hari Rionaldo Hari Rionaldo Hasrul Hasrul Hawa, Karfika Ainil Hawa, Karfika Ainil Heni Sugesti Heriza Saputri Heru Kristianto Holyness Nurdin Singadimedja Hutagaol, Martiandes Ida Zahrina Idral Amri Idroes, Ghazi M. Idroes, Ghifari Maulana Indarty, Rozanna Sri Irfan Sarhadi Akbar Jecky Asmura Jhon Fery Marihot Tua S Jimmy Anderson Julhijah, Noni Karfika Ainil Hawa Karina Octaria Putri Kemala, Pati Kesni savitri Kesni Savitri Khairan Khairan Khairan Khairan Khairat Khairat Khairat Komalasari Komalasari Komalasari Komalasari Komang, Hendri Kusumo, Fitranto Lala, Andi Lita Darmayanti Lubis, Vanizra F. Lukman Arifin M. Wahyu Nugraha Maulana, Aga Maulydia, Nur B. Mery Christina Mia Afriyenti Miftahudin, Dhani Nur Miftahudin, Dhani Nur Mohd Fajri Amrullah Monika Shecilia Muh. Fadlan Alfuadi Muhammad Dian Rizky Muhammad Gus Iqbal Al-Pakningi Muhammad Mardhiansyah Muhammad Rahman Muhammad Rifki Aulia Rahman Muhammad Zen, Muhammad Muliadi Ramli Mulya, Dynna Ardilla Putri Muslim Abdurrahman, Muslim Mustapa Ardi Nabela, Tasya Nasution, Muhammad Hatta Nazaris, Nazsha Nayyazsha Neonufa, Godlief Frederick Ni putu Vidya Primarista Ningsih, Diana S. Nirmala Sari Nur B. Maulydia Nur Khairiati Nurfatihayati Nurwijayanti Oktriyono, Febri Dwi Olsy, Fradilla Othman, Mohd. Roslee Pati Kemala Peliciamanuela, Samantha Prasetyo Arva S, Prasetyo Arva Pratama, Teddy Pratama, Yudistira Putra Zelly Nugraha, Putra Zelly Putra, Bayu Eldino Putra, Yogi Lesmana Putri Anjani Putri, Karina Octaria Putri, Karina Octaria Qalbi, Tiffani Qurotullaili Qurotullaili Rafi, M Khaidiz Rahayu, Ricky Puji Rahman, Sunarti Abd Raja Heru Nur Alam Ichsan, Raja Heru Nur Alam Ramdhani Asywal Randi Sanjaya Randi Sanjaya, Randi Rendy Putra Perdana Reno Susanto Reski, M. Ricfan Anggriawan Rina Maryenti Rinaldi Idroes Rio Nanda Novendra Rivo Fernando Rizki, Juliana Romie Jhonnerie Romy Romy Romy Romy Rozanna Sri Irianty Saparullah, Zulkarnaen Sari ' Ulfayana Saryono Saryono Setiadi, Fydel Sherly Oktarizona, Shinta Anggraini Silvia Reni Yenti Simbolon, Kristin Madelin Siregar, Thasya Nurfadillah Sitorus, Mesakh Fridolin Sri Helianty Sri Helianty Sri Rezeki Muria Sugesti, Heni Suhendrayatna Suhendrayatna Sukatin, Sukatin Sunarno Sunarno Surya, Andry Pratama Susanty, Wenny Susilowati Susilowati Syafi’i, Abdullah Syafrima Wahyu Syahputra, Dede Syaiful ' Bahri SYAIFUL BAHRI Syamsiar, Syamsiar Tengku Mukhlis Teuku Rizky Noviandy Topan Herianto Trina E. Tallei Trina E. Tallei, Trina E. TRINA EKAWATI TALLEI Trisuciati Syahwardini Trisuciati Syahwardini Triwahyuni, Vanny Efia Triyana Defi Ulfaa, Suci Mas’ama Ulima, Riris Vandhe Melsa Sembiring Viqrie Wahyudi Vito Oktariandi Walter Valentino Sinaga Warman Fatra, Warman Wenny Susanty Wenny Susanty Widya Yoesepha Yelmida Azis Yemita, Sylvia Yogi Chandra Yudha, Ricky Satria Z Zulfansyah Zahriah, Zahriah Zohera Zohera Zul Amraini, Said Zulfansyah Zulfansyah Zultiniar Zultiniar Zultiniar, Zultiniar