Article Per Year (5 Year)
p-Index From 2021 - 2026
3.533
P-Index
This Author published in this journals
All Journal Jurnal Teknik Kimia USU Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of Engineering and Technological Sciences Konversi Jurnal UNITEK Narra J Journal of Bioprocess Chemical and Environmental Engineering Science Jurnal Teknik Kimia USU Jurnal Pengabdian Masyarakat Bidang Sains dan Teknologi Jurnal Offshore: Oil, Production Facilities, and Renewable Energy Heca Journal of Applied Sciences Malacca Pharmaceutics Leuser Journal of Environmental Studies Infolitika Journal of Data Science JURNAL REKAYASA KIMIA & LINGKUNGAN
Zuchra Helwani, Zuchra
Unknown Affiliation
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 Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Transportation Veterinary Other

Published : 71 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 71 Documents
Search

 4   5   6   7   8 
Screening Polimer Untuk Eor (Enhanced Oil Recovery) Di Lapangan “X” Minyak Cekungan Sumatera Tengah Septiana, Dwi; Helwani, Zuchra; Abdurrahman, Muslim
Journal of Bioprocess, Chemical and Environmental Engineering Science Vol 3 No 1 (2022): Journal of Bioprocess, Chemical and Environmental Engineering
Publisher : Department of Chemical Engineering, Faculty of Engineering, UNRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jbchees.3.1.39-52

Abstract

Oil is the energy source that people demand and use the most right now. Recent years have seen a lot of interest in polymer flooding as a cutting-edge chemical-based enhanced oil recovery (EOR) solution. Field X Minyak Cekungan Sumatera is acceptable for chemical EOR (Polymer) testing with a success range of up to 70%. The polymer solution will follow the channel that the water has created, and because of its high viscosity, it tends to "block" this area of the reservoir, allowing previously immobilized oil to start flowing. This can improve sweep efficiency. In this study, four polymers will undertake screening tests on the basis of compatibility, concentration, viscosity vs. shear rate, filtration, screen factor, and thermal stability. The best results is polymer 2 after polymer screening included passing the compatibility test, producing the best viscosity compared to the other three polymers at the same concentration, FR 1.2, having the best screen factor value compared to the other three polymers, and passing the thermal stability test.
The Potent Antimicrobial Spectrum of Patchouli: Systematic Review of Its Antifungal, Antibacterial, and Antiviral Properties Kemala, Pati; Idroes, Rinaldi; Khairan, Khairan; Ramli, Muliadi; Tallei, Trina Ekawati; Helwani, Zuchra; Rahman, Sunarti Abd
Malacca Pharmaceutics Vol. 2 No. 1 (2024): March 2024
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/mp.v2i1.156

Abstract

ntention towards natural essential oils from medicinal plants has increased rapidly over the past decade as these oils have antimicrobial and antioxidant properties against various chronic diseases. One essential oil source with antimicrobial properties is the essential oil from Pogostemon cablin (Blanco) Benth. This review aims to provide information on using patchouli oil as an antimicrobial against bacterial, fungal, and viral pathogens in the last five years. There were 37 articles found in the PUBMED database by June 15, 2023. After searching, 6 of them were duplicates. A total of 2 papers were inaccessible, 4 were not research articles, and five were excluded because they were irrelevant to the scope of this study. This review shows that research related to patchouli as an antimicrobial in the last five years involves Pogostemon cablin leaf samples as silver nanoparticle bioreductors. Patchouli oil is used in membrane, nanocomposite film, and starch hydrogel manufacturing. Patchouli oil is a prestigious antimicrobial agent because it can fight numerous pathogenic microbes from bacteria, fungi, and viruses.
Optimizing Palm Oil Biodiesel Purity for a Cleaner Environment: Urea Complexation and RSM Approach Zohera, Zohera; Helwani, Zuchra; Sunarno, Sunarno
Leuser Journal of Environmental Studies Vol. 3 No. 2 (2025): October 2025
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v3i2.311

Abstract

The performance and stability of biodiesel are strongly influenced by its fatty acid composition, particularly the balance between saturated (SFA) and unsaturated fatty acids (UFA). This study employed the urea inclusion compound (UIC) method to fractionate biodiesel and optimize conditions for obtaining a high-yield, high-quality saturated fraction (UCF). A central composite design (CCD) under response surface methodology (RSM) was used to evaluate the effects of urea-to-methanol ratio, crystallization temperature, and crystallization time on UCF and NUCF yields and iodine values. Experiments were conducted using a range of crystallization temperatures (18–22 °C), times (3–5 h), and urea-to-methanol ratios (1:1.5–1:2.5). The response variables were analyzed and optimized using desirability functions. The results showed that all three factors significantly influenced both the yield and iodine value of the fractions. The optimal condition, urea-to-methanol ratio of 1:1.73, temperature of 19.99 °C, and time of 5 h, yielded 81.59% UCF with an iodine value of 36.65 g I2/100 g, falling within the desired range for high-performance saturated biodiesel. In contrast, the NUCF fraction was minimized to 1.76% and enriched in PUFA. These findings demonstrate the potential of UIC-based fractionation for producing biodiesel with improved oxidative stability and combustion properties, aligning with international quality standards and contributing to more sustainable fuel formulations.
Optimasi Proses Pembuatan Arang Batang Sawit Melalui Proses Karbonisasi Menggunakan Response Surface Methodology Afriyenti, Mia; Helwani, Zuchra; Fatra, Warman
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

Palm oil trunk until this date is a waste which still not been used maximally, so palm oil trunk have potential to be used as alternative energy resource of solid fuel with the way of increasing its calorific value through carbonization process. Carbonization is converting process of biomass to become charcoal at temperature range 300-600 oC in inert condition. The objective of this research is to study the characteristics of resulted solid fuels. Palm oil carbonization used tube furnace as reactor within operating conditions of temperature (350, 400 and 450 oC), residence time (90, 120 and 150 minutes) and feed size (2, 4 and 6 cm). The analized responses were calorific value and volatile matter content. Obtained result for calorific value amounts 24,426.300-28,929.100 kJ/kg and volatile matter content amounts 8-19 %. The obtained analysis is processed using Design Expert v7.0.0 Trial Version. Processing data begins with using first order to see the degree of curvature. Degree of curvature obtained indicate the model to use is second order. Level of significance between variables can be observed from the value of P-value < 0,05 and lack of fit > 0,05, which indicate that model is suitable with the obtained data. R2 obtained for Y1 = 0.9486 and Y2 = 0.9704. The most influential factors to all responses are carbonization temperature followed with residence time and feed size. At optimum operating conditions (temperature 449,99 °C during 149,96 minutes with feed size 2 cm), the value of optimum responses obtained are Y1= 28.282,2 kJ/kg and Y2 = 9,234 %.Keywords : biomass, carbonization, optimization, palm oil trunk, rsm, solid fuel
Pengaruh Kondisi Proses Terhadap Kuat Tarik Pulp Pada Pembuatan Pulp Rumput Perimping Dengan Pelarut Organik Asam Formiat Susanto, Edi; Helwani, Zuchra; 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

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

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 Biodiesel Dari Minyak Nyamplung Menggunakan Katalis Geopolimer: Pengaruh Suhu Reaksi Transesterifikasi Dan Rasio Mol Minyak Terhadap Metanol Syafi’i, Abdullah; Saputra, Edy; 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

Petroleum reserves in Indonesia are increasingly depleted, requiring the use of alternative energy that is environmentally friendly and renewable like biodiesel. Biodiesel can be made by transesterification process of vegetable oils. Process of making biodiesel commonly use homogeneous catalyst which has the disadvantage the formation of by products such as complexity of the separation of catalyst. Therefore, in this study biodiesel was synthesized from calophyllum inophyllum oil by using geopolymer catalyst. Geopolymer catalyst is first synthesized by reacting 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 1:6 and 1:9 and variations of temperature 55 and 65 oC. Physical characterization were done including density 871 kg/m3, kinematic viscosity 4.38 mm2/s, acid number 0.41 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
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
Synthesis of Heterogeneous Catalysts NaOH/CaO/C From Eggshells for Biodiesel Production Using Off-Grade Palm Oil Hawa, Karfika Ainil; Helwani, Zuchra; Amri, Amun
Jurnal Rekayasa Kimia & Lingkungan Vol 15, No 1 (2020): Jurnal Rekayasa Kimia & Lingkungan (June, 2020)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v15i1.14610

Abstract

A heterogeneous catalyst, such as Calcium Oxide (CaO), is widely used in biodiesel production due to its various advantages over homogeneous ones. The optimum condition for synthesizing this catalyst is determined by calcination temperature and mass ratio. As a result, a modification is required to increase its performance in improving the biodiesel yield. In this study, eggshell waste was modified by calcination, hydration, and dehydration methods integrated with activated carbon and NaOH. It is used as a heterogeneous base catalyst for off-grade palm oil transesterification reactions. The results shows the catalyst with the highest activity is obtained at calcination temperature of 800c and mass ratio of 7 to 3. This is achieved with transesterification reaction conditions, which include a mole ratio of methanol/oil 6 to 1, catalyst concentration of 6%-b oil, and temperature 70c for 3 hours, yielding 79.08% of the biodiesel. Additionally, CaO, Na2CO3, and Ca (OH) 2 materials were found in the catalyst with a catalyst alkalinity value of H greater than 9.3 through X-ray diffraction (XRD) analysis. Several methyl esters, such as palmitate and oleate were also found in biodiesel through Gas Chromatography-Mass Spectrometry (GC-MS) analysis.
Activation of Cement Clinker as Catalysts for Transesterification Reaction of Palm Oil Off Grade to Biodiesel Putri, Karina Octaria; Miftahudin, Dhani Nur; Helwani, Zuchra; Bahri, Syaiful
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 2 (2019): Jurnal Rekayasa Kimia & Lingkungan (December, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i2.14704

Abstract

Calcium oxide (CaO) is a heterogeneous solid base which is generally used as a catalyst in making biodiesel. It is mainly obtained from cement clinker and activated through calcination method. The purpose of this study was to determine the effect of using cement clinker catalyst on the yield of the biodiesel. A batch reactor with a condenser was used in making the biodiesel under favorable conditions such as calcination temperatures of 700 C, 750 C and 800 C, time of 5, 6 and 7 hours, and catalyst concentration of 1%-w, 2%-w, and 3%-w oil. The analysis involved X-Ray Diffraction (XRD) and Brunauer-Emmett-Teller (BET) for catalysts and Gas Chromatography-Mass Spectrometry (GC-MS). The catalyst calcination temperature determined the optimum conditions. From this study, the conditions necessary for transesterification reaction include the mole ratio of methanol/oil of 6 to 1, the temperature of 70 C for 2 hours and 700 C for 5 hours, and catalyst dosage of 2% by weight. Under these conditions, the yield of the biodiesel was 84.26%. Additionally, at the calcination temperature of 800 C for 7 hours and catalyst dosage of 3% by weight, the yield of the biodiesel was 76.84%. CaO, SiO2, 2CaO.SiO2 and 3CaO.SiO2 were found in the catalyst through XRD analysis. The specific surface areas of the catalyst were 25,497 m2/g (700 C/5 hours) and 35,879 m2/g (800 C/7 hours) through BET analysis. According to the GC-MS analysis, the main components of the biodiesel include methyl palmitate, methyl oleate, and methyl stearate.
Optimization of the Condition of Palm Frond Torrefaction Process by Utilizing Liquid Torrefaction Product as Pre-treatment for Improve Product Quality Susanty, Wenny; Helwani, Zuchra; Bahruddin, Bahruddin
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.13443

Abstract

AbstractPalm frond can be converted to solid fuel using torrefaction process as an alternative energy source. Torrefaction is the process to convert the biomass into solid fuel at a temperature range of 200-300oC in inert condition. Calorific value is the most important response in solid fuel. The aim of this research is to obtain the optimum condition of palm fronds torrefaction statistically was used Response Surface Methodology. Torrefaction of palm frond on fixed bed a horizontal reactor which is equipped with horizontal condenser and condensate trap with the condition process such as the temperature (225-275oC), time (15-45 min), and N2 flow rate (50-150 ml/min). This research methodology consist of drying, washing with liquid product of torrefaction, torrefaction, and analysis. The response variables were mass yield, calorific value, energy yield, and proximate. Design Expert Trial Version 7.0 Software was used for optimization of condition process with desirability. The optimized condition process were temperature of 275oC, time of 44 minute, and N2 flow rate of 50 ml/min.Keywords: solid fuel, design expert, optimization, palm frond, torrefaction
Co-Authors Abd , Ammar Ali Abd Rahman, Sunarti Afriyenti, Mia Agustiyanti, Rini Dwi Agustiyanti, Rini Dwi Ahmad Fadli Ahmad, Khairunnas Akbar, Irfan Sarhadi Amir Awaluddin Amun Amri Anggraini, Diva Putri Anggriani, Rara Dewi Anjani, Putri Anuar, Kaspul Asep Rusyana Aswie, Viqha Bahruddin Bahruddin Bahruddin Boy M. Bachtiar Damayanti, Elok David Andrio Dhani Nur Miftahudin Dizikri, Dizikri Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati Dwi Septiana Edi Susanto Edy Saputra Eko Suhartono Emran, Talha Bin Febrina Dwi Putri Febrina Dwi Putri, Febrina Dwi Febrina, Wetri Fernando, Rivo Ghazi Mauer Idroes Hafiz, Fadlillahi Hanafi, Muhammad Rifter Hari Rionaldo Hari Rionaldo Hawa, Karfika Ainil Hawa, Karfika Ainil Hutagaol, Martiandes Ida Zahrina Idral Amri Idroes, Ghazi M. Idroes, Ghifari Maulana Jecky Asmura Julhijah, Noni Karfika Ainil Hawa Karina Octaria Putri Kemala, Pati Kesni Savitri Khairan Khairan Komalasari Komalasari Komang, Hendri Kusumo, Fitranto Lala, Andi Lubis, Vanizra F. Lukman Arifin Maulana, Aga Maulydia, Nur B. Miftahudin, Dhani Nur Miftahudin, Dhani Nur Muhammad Mardhiansyah Muhammad Zen, Muhammad Muliadi Ramli Mulya, Dynna Ardilla Putri Muslim Abdurrahman, Muslim Nasution, Muhammad Hatta Nazaris, Nazsha Nayyazsha Neonufa, Godlief Frederick Ningsih, Diana S. Noviandy, Teuku R. Nurfatihayati Nurwijayanti Oktariandi, Vito Oktriyono, Febri Dwi Olsy, Fradilla Othman, Mohd. Roslee Peliciamanuela, Samantha Perdana, Rendy Putra Prasetyo Arva S, Prasetyo Arva Pratama, Teddy Pratama, Yudistira Putra Zelly Nugraha, Putra Zelly Putra, Bayu Eldino Putra, Yogi Lesmana Putri, Karina Octaria Putri, Karina Octaria Qalbi, Tiffani Rafi, M Khaidiz Rahayu, Ricky Puji Rahman, Sunarti Abd Raja Heru Nur Alam Ichsan, Raja Heru Nur Alam Randi Sanjaya Randi Sanjaya, Randi Reno Susanto Reski, M. Rinaldi Idroes Rizki, Juliana Rizky, Muhammad Dian Rozanna Sri Irianty Saparullah, Zulkarnaen Saryono Saryono Setiadi, Fydel Simbolon, Kristin Madelin Siregar, Thasya Nurfadillah Sitorus, Mesakh Fridolin Sugesti, Heni Suhendrayatna Suhendrayatna Sunarno Sunarno Surya, Andry Pratama Susanty, Wenny Susilowati Susilowati Syafi’i, Abdullah Syahputra, Dede SYAIFUL BAHRI Tengku Mukhlis Teuku Rizky Noviandy Topan Herianto Trina E. Tallei, Trina E. TRINA EKAWATI TALLEI Triwahyuni, Vanny Efia Ulfaa, Suci Mas’ama Ulima, Riris Warman Fatra, Warman Wenny Susanty Yelmida Azis Yemita, Sylvia Yudha, Ricky Satria Z Zulfansyah Zahriah, Zahriah Zohera, Zohera Zul Amraini, Said Zulfansyah Zulfansyah Zultiniar, Zultiniar