Article Per Year (5 Year)
p-Index From 2019 - 2024
3.538
P-Index
This Author published in this journals
All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of Engineering and Technological Sciences Journal of Bioprocess Chemical and Environmental Engineering Science Jurnal Pengabdian Masyarakat Bidang Sains dan Teknologi Jurnal Offshore: Oil, Production Facilities, and Renewable Energy Jurnal Rekayasa Kimia & Lingkungan
Zuchra Helwani, Zuchra
Unknown Affiliation
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering 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 Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Transportation Veterinary

Published : 49 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 49 Documents
Search

 1   2   3   4   5 
Alkaline Treatment of Oil Palm Frond Fibers by Using Extract of Oil Palm EFB Ash for Better Adhesion toward Polymeric Matrix Fatra, Warman; Sanjaya, Randi; Zulfansyah, Zulfansyah; Rionaldo, Hari; Helwani, Zuchra
Journal of Engineering and Technological Sciences Vol 47, No 5 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (294.663 KB) | DOI: 10.5614/j.eng.technol.sci.2015.47.5.3

Abstract

In Indonesia, 187 million tons of biomass were produced from 8.11 million ha of oil palm plantation in 2009. This massive amount of biomass mainly consists of oil palm fronds (OPF) and oil palm empty fruit bunches (EFB), which are normally categorized as waste. The properties of OPF fibers compared to those of synthetic fibers, such as low density, low cost, less abrasion of equipment, and safer production, makes them an attractive reinforcement for composite materials. In this work, the utilization of oil palm empty fruit bunch ash for OPF fiber-polyester resin composite and the effect of process conditions were studied. Water absorption, tensile and flexural strength were used to characterize the effects of alkaline treatment on modified OPF fibers in polyester resin. The investigation focused on the effect of alkaline treatment time. Treatment temperature and liquid to solid ratio were analyzed using Response Surface Method-Central Composite Design (RSM-CCD). The highest tensile strength (44.87 MPa) was achieved at 12 hours soaking time, at 40°C treatment temperature and 5:1 water to ash ratio. The highest flexural strength (120.50 MPa) was obtained at 1.3 hours soaking time, 4 dissolving ratio and 35°C treatment temperature. The lowest water absorption of composite (3.00%) was achieved at the longest soaking time (14.7 hours), 4 dissolving ratio and 35°C treatment temperature. Variance of soaking time, dissolving ratio and temperature in the alkaline treatment process using extract of oil palm empty fruit bunch ash significantly affected the mechanical and physical properties of the oil palm frond fibers reinforced composite.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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
Pembuatan Keramik Berpori Berbahan Baku Tricalcium Phospate Dengan Metode Protein Foaming-Starch Consolidation Pratama, Teddy; Fadli, Ahmad; Helwani, Zuchra
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Porous Tricalciumphosphate (TCP) is a synthetic material that can be used as bone implant. Porous TCP production can be conducted by Protein Foaming-Starch Consolidation method that using yolk as an agent to form pore. This research aims to study the influence of process variables i.e time of sintering (1-3 hours), time of burning (1-3 hours) and mixing rate (100-200 rpm) toward physical, chemical and mechanical properties of porous TCP using Response Surface Methodology (RSM) also characteristic porous TCP. Analyzed respons were porosity, density and compressive strength. Product characteristic of TCP resulted of porousity was 69.71-81.88%, density was 0.569-0.951g/cm3 and compressive strength was 1.05-1.85 MPa. Data processing using second order model obviously seen from significant curvature. Significance level between variables can be seen from pvalue < 0,05 and lack of fit > 0,05 which show that model was corresponding toward the result. R2 obtained were Y1 = 0.9383%, Y2 = 0.9384% , Y3 = 0.9674%. The most affecting factor significantly towards all the responses was time of sintering that followed by time of burning and mixing rate. Optimum condition was obtained at 3 hours time of sintering , 3 hours time of burning and mixing rate of 100 rpm with the optimum value of response for porosity by 70.56%, density by 0.92 gr/cm3 and compressive strength 1.66 MPa.Keywords : bone implant, protein foaming-starch consolidation, response surface methodology, tricalcium phosphate.
Proses Densifikasi Pelepah Sawit Menggunakan Crude Gliserol Sebagai Filler Menjadi Bahan Bakar Padat Yudha, Ricky Satria; Helwani, Zuchra; Komalasari, Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Empty fruit bunches only used as a source of raw materials for animal feed, compost and organic fertilizer in the plantation. Palm empty fruit bunches has a calorific value of 18.795 kJ/kg. The calorific value can be increased by torefaction. Torefaction is one composing method with temperature 200 - 300°C to increase the density of the biomass so that it will increase the calorific value of the biomass. The purpose of this research is to produce solid fuel products from palm empty fruit bunches uses torefaction process, to determine the characteristics of the product and determine the effect of glycerol filler composition and pressure in the process of densification in density, calorific value and proximate. The variables for this research were glycerol filler composition (10, 20 and 30%) and pressure (50, 70 and 80 bar). The particle size used were less than 20 mesh. The highest density of the product was 0.6893 gr/cm3 which obtained at 10% composition and 50 bar. The lowest ash content of the product was 8.91% which obtained at 30% composition and 80 bar. The lowest moisture of the product was 0.91% which obtained at 10% composition and 80 bar. On the other hand, it produced highest fixed carbon and calorific value for 45.47% and 24011.77 kJ/kg, respectively.Keywords: torefaction, density, calorific value, filler, palm empty.
Sintesis Hidroksiapatit Melalui Precipitated Calcium Carbonate (PCC) Dari Cangkang Kerang Darah Dengan Metode Hidrotermal Pada Variasi Waktu Reaksi Dan Rasio Ca/P Ichsan, Raja Heru Nur Alam; Helwani, Zuchra; Zultiniar, Zultiniar
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Potential of waste blood cockle shell in Indonesia is quite large. Waste of blood cockle shell contains calcium carbonate compounds that can be used as raw material for the synthesis of hydroxyapatite . In this research, the PCC synthesis of blood cockle shell in advance to obtain a pure hydroxyapatite. The aim of this research was to get the hydroxyapatite from PCC blood cockle shell, determine optimum process condition and also to investigate the effect of the Ca/P mole ratio and the reaction time toward Hydroxyapatite synthesis. The powder of sea shell was calcined at 900 oC for 2 hours. CaO was converted to PCC which then reacted with diammonium hydrogen phosphate by using water as solvent. The samples then were characterized by using FTIR (Fourier Transform Infrared), XRD (X-Ray Diffraction), and SEM (Scanning Electron Microscopy). The functional groups were observed in the FTIR of the synthesized hydroxyapatite are phosphate (PO43-), hydroxyl (OH-), and carbonate (CO32-). These functional groups indicate that hydroxyapatite has been formed. XRD data showed the main peaks for hydroxyapatite that strenghtened the truth of FTIR characterization. SEM was used to observe the morphology of the synthesized hydroxyapatite that consisted of agglomerates. The optimum conditions in this research is the synthesis of HAp with a ratio of Ca / P 1,61 and 20 hours reaction time with a particle size of hydroxyapatite 39,43 nm, conversion 91,99% and yield 96,66 %.Keywords : Blood cockle shell, Hydroxyapatite, Hydrothermal, Precipitated calcium carbonate
CaO Berbasis Kulit Telur Ayam Dengan Penambahan Karbon Aktif Dan Natrium Hidroksida (CaO-NaO/C) Sebagai Katalis Untuk Sintesis Biodiesel Dari Minyak Sawit Off-Grade Rahayu, Ricky Puji; Helwani, Zuchra; Amri, Amun
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Chicken eggshells CaO based catalyst with the addition of activated carbon and sodium hydroxide (CaO-NaO/C) has been successfully synthesized for production of biodiesel from palm oil off-grade. The catalyst was characterized by X-Ray Diffraction analysis (XRD), Brunauer-Emmett-Teller (BET) and basic strength while the characterization of biodieselwas by Gas Chromatography-Mass Spectrometry (GC-MS). The catalyst was synthesized by calcining the chicken eggshell as source of CaCO3 at the calcination temperature of 900 ˚C for 3 hours. The CaO was then supported by activated carbon as catalyst buffer andimpregnated with 30% NaOH solution. The catalyst with the highest catalytic activity was obtained at calcination temperature of 500 ˚C and mass ratio of CaO:C at 6:4. The yield of biodiesel amounted to 79.08% were obtained by transesterification process with the molarratio of oil:methanol 1:10, catalyst concentration of 1%-b oil and reaction temperature of 65 ˚C for 3 hours. The CaO, Na2CO3, Ca(OH)2 and CaCO3 were found in the catalyst through the (XRD) while the basic strength of the catalyst H_ was > 9,3 determined by using Hammett Indicator phenolphthalein. The specific surface area of the catalyst obtainedthrough analysis by the (BET) method was 18.880 m2/g. Characteristics of biodiesel such as density, kinematic viscosity, acid number, and flash point have matched with the standard for biodiesel specification. Some methyl esters formed such as methyl palmitate and methyloleate were found in biodiesel through analysis of (GC-MS).Keywords : Biodiesel, catalysts, calcium oxide, activated carbon, transesterification
Produksi Biodiesel Dari Minyak Sawit Off Grade menggunakan Klinker Semen Teraktivasi Sebagai Katalis Untuk Reaksi Transesterifikasi Putri, Karina Octaria; Helwani, Zuchra; Bahri, Syaiful
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Cement clinker used as solid base catalyst and activated through calcination method. Effect of calcination temperature on the catalytic performance studied. The catalyst with the highest activity is obtained when the calcination temperature of 800 °C and the calcination time of 7 hours with transesterification reaction conditions are a molar ratio of methanol/oil 6:1, catalyst dosage of 3% by weight, temperature of 70 °C for 2 hours with yield biodiesel results reached 76,84%. CaO, SiO2, 2CaO.SiO2 and 3CaO.SiO2 materials found in the catalyst through x-ray diffraction (XRD) analysis and specific surface area of catalyst is 35,879 m2/g through Brunauer-Emmett-Teller (BET) analysis. Main composition of biodiesel found through Gas Chromatography-Mass Spectrometry (GC-MS) analysis, such as methyl palmitate, methyl oleate, methyl stearic, methyl myristate, methyl arachidate and methyl laurate.Keywords: biodiesel, calcium oxide, catalysts, cement clinker, transesterification.
Preparasi Katalis CaO/Fly Ash Dan Penggunaannya Pada Reaksi Transesterifikasi Minyak Sawit Off Grade Untuk Produksi Biodiesel Anggraini, Diva Putri; Helwani, Zuchra; Saputra, Edy
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Calcium oxide preparation of solid base catalyst through calcination, hydration, dehydration methods with fly ash to load calcium oxide through impregnation method. 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 3 hours with transesterification reaction conditions of a molar ratio of methanol/oil 6:1, catalyst dosage of 6% by weight, temperature of 70 °C for 2 hours with yield biodiesel results reached 84,32%. CaO, SiO, Ca2SiO4 and Ca(OH)2 materials was found in the catalyst through x-ray diffraction (XRD) analysis with a catalyst alkalinity values of H_ > 9.3 through alkalinity analysis using hammet indicator phenolphthalein and specific surface area of catalyst is 8,31 m2/g through Brunauer-Emmett-Teller (BET) analysis. Some methyl ester such as methyl palmitate and methyl oleate was found in the biodiesel through Gas Chromatography-Mass Spectrometry (GC-MS) analysis.Keywords: biodiesel, calcination, dehydration, hydration, transesterification
Aktivasi Klinker Semen Sebagai Katalis Pada Proses Produksi Biodiesel Dari Minyak Sawit Off Grade Miftahudin, Dhani Nur; Helwani, Zuchra; Bahri, Syaiful
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Clinker cement is a solid material activated by calcinations method. The optimum condition studied by a variation of calcinations time. The catalyst with highest activity is obtained when the calcinations time is 5 hours and calcinations temperature is 700 °C with transesterificationreaction conditions are a molar ratio of methanol/oil 6:1, catalyst dosage of 2% y weight, temperature of 70 °C for 2 hours with yield biodiesel result reached 84,26%. CaO, SiO2, 2CaO.SiO2 and 3CaO.SiO2 materials found in the catalyst thrugh x-ray diffraction (XRD) analysis and specific surface area of catalyst is 25,497 m2/g through Brunauer-Emmett-Teller(BET) analysis. Some of metil ester such as methyl palmitate, methyl oleate, methyl stearic, methyl myristate, and methyl laurate are found through Gas Chromatography-MassSpectrometry (GC-MS) analysis.Keywords: biodiesel, calcium oxide, catalysts, cement clinker, transesterification.
Modifikasi Kulit Telur Puyuh Dan Fly Ash Menjadi Katalis Cao/Fly Ash Untuk Reaksi Transesterifikasi Minyak Sawit Off Grade Menjadi Biodiesel Simbolon, Kristin Madelin; Helwani, Zuchra; Irianty, Rozanna Sri
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Quail eggshells CaO based catalyst with the addition of fly ash has been successfully synthesized for production of biodiesel from palm oil off-grade. Quail eggshells waste modificated of solid base catalyst through calcination, hydration, dehydration methods with fly ash through impregnation method to load calcium oxide with quail eggshells as precursor.The catalyst was characterized by X-Ray Diffraction (XRD) and basic strength while the characterization of biodiesel was by Gas Chromatography-Mass Spectrometry (GC-MS). The catalyst was synthesized by calcining the quail eggshells as source of CaCO3 at calcination temperature of 900 oC for 2,5 hours. The CaO was then supported by fly ash. The catalyst with the highest catalytic activity was obtained at dehydration temperature of 500 oC and the dehydration time of 4 hours with transesterification reaction conditions of a molar ratio of methanol/oil 6:1, catalyst concetration of 6%-b oil and temperature of 70 °C for 2 hours with yield biodiesel results reached 85,12%.Keyword: biodiesel, calcium oxide, catalysts, fly ash, transesterification
Co-Authors Agustiyanti, Rini Dwi Ahmad Fadli Amun Amri Anggraini, Diva Putri Aswie, Viqha Bahruddin Bahruddin Bahruddin Damayanti, Elok David Andrio Dhani Nur Miftahudin Dizikri, Dizikri Drastinawati Drastinawati Edy Saputra Febrina Dwi Putri Hafiz, Fadlillahi Hanafi, Muhammad Rifter Hari Rionaldo Hari Rionaldo Hawa, Karfika Ainil Hutagaol, Martiandes Ida Zahrina Idral Amri Karfika Ainil Hawa Karina Octaria Putri Kesni Savitri Komalasari Komalasari Komang, Hendri Lukman Arifin Miftahudin, Dhani Nur Muhammad Mardhiansyah Muhammad Zen, Muhammad Mulya, Dynna Ardilla Putri Nasution, Muhammad Hatta Olsy, Fradilla Prasetyo Arva S, Prasetyo Arva Pratama, Teddy Pratama, Yudistira Putra Zelly Nugraha, Putra Zelly Putra, Bayu Eldino Putra, Yogi Lesmana Putri, Karina Octaria Qalbi, Tiffani Rafi, M Khaidiz Rahayu, Ricky Puji Raja Heru Nur Alam Ichsan, Raja Heru Nur Alam Randi Sanjaya Randi Sanjaya, Randi Reno Susanto Reski, M. Rizki, Juliana Rozanna Sri Irianty Said Zul Amraini Saparullah, Zulkarnaen Setiadi, Fydel Simbolon, Kristin Madelin Sitorus, Mesakh Fridolin Sugesti, Heni Surya, Andry Pratama Susilowati Susilowati Syahputra, Dede SYAIFUL BAHRI Tengku Mukhlis Topan Herianto Ulima, Riris Warman Fatra Warman Fatra Warman Fatra, Warman Wenny Susanty Yelmida Azis Yemita, Sylvia Yudha, Ricky Satria Z Zulfansyah Zultiniar, Zultiniar