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All Journal DIKSI Jurnal Pendidikan Bahasa dan Sastra Indonesia Undiksha Jurnal Teknik ITS Animal Agricultural Journal IPTEK The Journal of Engineering IPTEK Journal of Proceedings Series Eksergi: Chemical Engineering Journal EXPOSURE JOURNAL Solidarity: Journal of Education, Society and Culture Padjadjaran Journal of Dentistry Jurnal Biologi Tropis International Journal of Language Teaching and Education JURNAL PHOTON NUANSA Manuju : Malahayati Nursing Journal Biolearning Journal ACCOUNTIA JOURNAL Accounting Trusted, Inspiring, Aunthentic Journal Jurnal Sastra Indonesia INTERACTION: Jurnal Pendidikan Bahasa Cakrawala Indonesia Jurnal Ners Journal of Telenursing (JOTING) Jurnal Perseda : Jurnal Pendidikan Guru Sekolah Dasar Anakes: Jurnal Ilmiah Analis Kesehatan Jurnal Kesehatan: Jurnal Ilmu- Ilmu Keperawatan, Kebidanan, Farmasi dan Analis Kesehatan Borneo Educational Journal (Borju) Jurnal Kesehatan Tambusai SINTA Journal (Science, Technology, and Agricultural) Didaktis: Proseding Seminar Nasional Pendidikan Dasar Journal of Education Research Prosiding Seminar Nasional Program Pengabdian Masyarakat Ruang Pengabdian : Jurnal Pengabdian Kepada Masyarakat Jurnal Media dan Teknologi Pendidikan Edukasiana: Jurnal Inovasi Pendidikan Indonesian Journal of Management Science Sewagati Matalensa Journal of Photography and Media Journal of Empowerment and Community Service Riwayat: Educational Journal of History and Humanities Jurnal Multidisiplin Indonesia Dharma: Jurnal Pengabdian Masyarakat Lentera Ilmu Jurnal Pengabdian Nusantara JURNAL INSAN CENDEKIA
Yeni Rahmawati, Yeni
Departemen Teknik Kimia Institut Teknologi Sepuluh Nopember
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Journal : Eksergi: Chemical Engineering Journal

 1 
Kinetic and Thermodynamic Studies in Cellulose Acetate-Polybutylene Succinate(CA-PBS)/Single Solvent/Water System for Desalination Membrane Retno Dwi Nyamiati; Siti Nurkhamidah; Yeni Rahmawati; Wahyu Meka
Eksergi Vol 20, No 1 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i1.8820

Abstract

The most important part of the membrane synthesis process so that it has the desired pores is the solidification process of the membrane, the process begins with a change from one liquid phase into two liquid phases (liquid-liquid demixing). At a certain period during demixing, the polymer-rich phase solidifies; thus, a dense membrane matrix is formed. Parameters that determine the mechanism of membrane formation are based on thermodynamics including phase separation of Solvent-Polymer-Non-solvent which is explained through a phase diagram (Flory-Huggins Theory). This study aims to determine the initial prediction of the formation of CA-PBS membranes with various solvents used and variations of non-solvents in the best system, which is proven by its characteristics and performance when applied to desalination membranes which include ternary diagrams using cloud point data, solubility parameters with Hansesn solubility, the solvent-non-solvent diffusivity using the Tyn Calus Equation approach and the morphological proofing of the membrane through SEM photos, and the performance of the resulting membrane through salt rejection and permeate flux. The results of the difference in solubility parameters are can be predicted that using DMF solvent on the CA-PBS membrane can reduce the pore size and eliminate voids and macrovoids in the membrane morphology.
Effect of Immersion Time on CA/NMP Membrane Preparation for Microplastic Separation in Water Rahmah, Annisa Alifia; Rifai, Muhammad Ayub; Nurkhamidah, Siti; Rahmawati, Yeni
Eksergi Vol 21, No 2 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i2.12854

Abstract

Indonesia produces more than 4.8 million tons of plastic waste every year, but it has not been managed properly so that it will end up in Indonesian waters. This plastic waste is then decomposed into microplastics (MPs) which are <5 mm in size. The presence of MPs in Indonesian waters can have a negative impact on living things, so it needs to be separated from the waters. One method that is considered to separate MPs in water is microfiltration using Membrane Technology. This study aims to determine the effect of immersion time on the characteristics and performance of microfiltration membranes. The fabrication of membrane was prepared using phase inversion method, with Cellulose Acetate (CA)/N-Methyl-2Pyrrolidone (NMP) as polymer/solvent and distilled water as non-solvent. Characteristics analysis to determine the hydrophilicity of the membrane such as contact angle, moisture content, porosity and pore size of the membrane. Scanning Electrone Microscope (SEM) to determine the surface morphology and structure of the membrane, and analysis of microplastic rejection in water. The results of the characteristic analysis showed that the membrane was hydrophilic with a contact angle in the range of 61-53°, porosity of 80-83%, moisture content of 79-82% and pore size of 8.4-5.8 μm in accordance with the microfiltration membrane, as well as the membrane rejection ability reached 99%. So that membrane technology needs to be developed again to separate MPs in water.
Pengaruh Gliserol sebagai Plasticizer terhadap Karakterisasi Edible Film dari Kappa Karaginan Larasati, Wahyu Adinda; Rahmawati, Yeni; Taufany, Fadlilatul; Susianto, Susianto; Altway, Ali; Nurkhamidah, Siti
Eksergi Vol 21, No 3 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i3.12451

Abstract

Perkembangan industri pengemasan makanan di era mendatang akan beralih ke bahan alami dan ramah lingkungan yang bisa diproduksi dari biopolimer seperti pati dan hidrokoloid lainnya untuk mengurangi paparan polusi dari polimer sintetis. Kappa karaginan memiliki sifat yang rapuh, sehingga dibutuhkan plasticizer untuk menghasilkan edible film yang lebih elastis. Jenis plasticizer yang digunakan adalah gliserol. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh konsentrasi gliserol terhadap karakterisasi edible film dari kappa karaginan. Kappa karaginan dengan konsentrasi 1% (b/v) dilarutkan dengan akuades kemudian ditambahkan gliserol dengan variasi konsentrasi 0,5; 1; 1,5, dan 2% (b/v). Edible film kemudian di karakterisasi berdasarkan sifat mekanik, gugus fungsional, ketebalan, kadar air, kuat tarik, elongasi, warna dan opacity. Hasil analisa menunjukkan bahwa penambahan gliserol sebesar 1% dapat meningkatkan sifat mekaniknya, dan film mempunyai 0,146 mm, kadar air 17,90%, kuat tarik dan elongasi 2,53 MPa dan 14,09% dan sifat optik warna dan opacity masing-masing sebesar 96,96% dan 1,32. 
Aplikasi Membran Komposit PSF/Zeolit untuk Pemisahan Zat Warna Methylene Blue Nurkhamidah, Siti; Rahmawati, Yeni; Virdiansyah, Wahyu Fiqih
Eksergi Vol 21, No 3 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i3.12439

Abstract

Industri tekstil menghasilkan limbah cair dengan kandungan zat warna sekitar 40%. Metilen biru adalah zat warna yang dapat berdampak pada terganggunya ekosistem perairan dan kesehatan manusia karena bersifat karsinogenik. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan zeolit pada membran polisulfon (PSF) terhadap kinerja membran dalam penyisihan metilen biru. Metode pembuatan membran menggunakan metode inversi fasa dengan N-Methyl-2-pyrrolidone (NMP) sebagai solvent dan akuades sebagai nonsolvent. Karakterisasi membran berdasarkan uji SEM-EDX, menunjukkan zeolit terdeposit pada permukaan membran secara merata. Pada penyisihan metilen biru didapatkan permeabilitas lebih rendah dengan menggunakan zeolit dibanding yang tidak menggunakan zeolit. Sedangkan rejeksi membran PSF dengan zeolit lebih tinggi daripada membran PSF tanpa zeolit. Rejeksi membran PSF dengan zeolit didapatkan hasil hingga 93%.
Aplikasi Membran Komposit PSF/Zeolit untuk Pemisahan Zat Warna Methylene Blue Siti Nurkhamidah; Yeni Rahmawati; Wahyu Fiqih Virdiansyah
Eksergi Vol 21 No 3 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i3.12439

Abstract

Industri tekstil menghasilkan limbah cair dengan kandungan zat warna sekitar 40%. Metilen biru adalah zat warna yang dapat berdampak pada terganggunya ekosistem perairan dan kesehatan manusia karena bersifat karsinogenik. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan zeolit pada membran polisulfon (PSF) terhadap kinerja membran dalam penyisihan metilen biru. Metode pembuatan membran menggunakan metode inversi fasa dengan N-Methyl-2-pyrrolidone (NMP) sebagai solvent dan akuades sebagai nonsolvent. Karakterisasi membran berdasarkan uji SEM-EDX, menunjukkan zeolit terdeposit pada permukaan membran secara merata. Pada penyisihan metilen biru didapatkan permeabilitas lebih rendah dengan menggunakan zeolit dibanding yang tidak menggunakan zeolit. Sedangkan rejeksi membran PSF dengan zeolit lebih tinggi daripada membran PSF tanpa zeolit. Rejeksi membran PSF dengan zeolit didapatkan hasil hingga 93%.
Modelling Urea and Creatinine Concentration Distribution in Hollow Fiber Membranes for Hemodialysis Applications Fauziah, Melinda Nur; Nurkhamidah, Siti; Taufany, Fadlilatul; Altway, Ali; Susianto; Rahmawati, Yeni
Eksergi Vol 22 No 2 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i2.14515

Abstract

Humans are dynamic creatures who continue to follow developments over time. This development also has a big impact on changes in habits and has an impact on the health of everyone, which needs special attention in this era of globalization. One of the treatments for kidney failure patients is kidney function replacement therapy, namely haemodialysis. Haemodialysis therapy is a high technology to replace the function of the kidneys in removing metabolic waste (air, sodium, potassium, hydrogen, urea, creatinine, uric acid and other substances) through a semi-permeable membrane as a separator for blood and dialysate fluid in an artificial kidney (dialyzer). where the processes of diffusion, osmosis, and ultrafiltration occur. In this study, a hollow fiber type dialyzer was used which consisting of three main components: the shell (which directs dialysate flow), the porous membrane, and the tube (which carries blood). In general, this research will be carried out theoretically by developing a mathematical model of mass transfer in hollow fiber membranes in the haemodialysis process to study the distribution of urea and creatinine concentrations in the tube, membrane, and shell axial and radial section, the effect of pore area of membrane on urea and creatinine clearance, and the influence of dialysate flowrate on urea and creatinine clearance. The mathematical modeling successfully illustrates the distribution of urea and creatinine concentrations within the hollow fiber membrane both axially and radially, with a concentration decrease from blood to dialysate, influenced by diffusion and convection mechanisms. Simulation results indicate that increasing dialysate flowrate enhances haemodialysis efficiency, but its effect diminishes after reaching a certain threshold. Meanwhile, increasing the membrane surface area from 1.3 m² to 1.8 m² results in only a slight reduction in the urea concentration from 16.67 mol/m³ to 16.62 mol/m³ and creatinine from 8.85 mol/m³ to 8.83 mol/m³, demonstrating that membrane surface area has a smaller impact.
Comparative Analysis of CO₂ Content in Biogas and Synthetic Gas Using Chittick Titration Validated by Gas Chromatography Pambudi, Alfian Wisnu; Rahmawati, Yeni; Taufany, Fadlilatul; Altway, Ali; Susianto
Eksergi Vol 22 No 2 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i2.14809

Abstract

This study aimed to validate the Chittick titration method for measuring carbon dioxide (CO2) content using gas chromatography (GC) as the reference method. Two types of gas samples were analyzed: synthetic CO2/N2 gas with a theoretical composition of 40:60 and biogas produced by anaerobic fermentation. Analyses were conducted in parallel using both methods to compare CO2 measurements. For synthetic gas, the Chittick titration recorded an average CO2 content of 39.11%, whereas GC recorded 40.52%. For biogas, Chittick titration produced 30.16%, whereas GC measured 31.40%. The differences between the methods were 0.81% for synthetic gas and 1.55% for biogas, with relative errors of 2.00% and 3.45%, respectively. The t-test results showed statistically significant differences (p < 0.05) between the methods for both gas types. However, the observed deviations remained within practically acceptable limits for small-scale laboratory applications. These findings suggest that Chittick titration is a practical and cost-effective alternative for estimating CO2 content, particularly in laboratories with limited access to gas chromatography equipment. This study is expected to serve as a useful reference for educational institutions and small laboratories that are seeking to develop simple gas analysis methods with adequate validity.
Effect of Diethanolamine (DEA) Solvent Flow Rate on the CO2 Absorption-Desorption Process Using a Hollow Fiber Membrane Contactor Pamungkas, Raditya; Nurkhamidah, Siti; Taufany, Fadlilatul; Altway, Ali; Susianto, Susianto; Rahmawati, Yeni
Eksergi Vol 22 No 3 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i3.14951

Abstract

One of the primary objectives in decarbonization is the separation of CO₂ from industrial gas mixtures, particularly in application such as biogas purification and flue gas treatment. A dual-layer crossflow membrane module was utilized under both circulation and batch operating modes with a 30% DEA solution. This study investigates the influence of solvent flow velocity on CO₂ separation performance using a hollow fiber membrane contactor with a 30% DEA solvent. the process was evaluated under two operating modes: batch and solvent circulation. Key variables measured include the solvent flow rate (40–160 mL/min), operating temperature (30–50°C), and sweep gas flow rate (100–300 mL/min). The results indicate that under continuous operation with a solvent flow rate of 160 mL/min, a temperature of 30°C, and a sweep gas flow rate of 100 mL/min, 50.42% of the CO₂ was successfully removed. In contrast, the batch system, under identical conditions achieved only a 27.8% removal rate. The superior performance in circulation mode is attributed to the continuous renewal of the solvent, which sustains a stable concentration gradient and minimizes mass transfer resistance. These findings underscore the potential of membrane-based systems with optimized solvent circulation for efficient and stable CO₂ capture in industrial applications.
Co-Authors A Halim A'yunin, Intan Qurratun A. Azhari, A. Abdul Wasi&#039; Achmad Roesyadi Adiningsih, Rosyidah Aditya Maulana, Aditya Ahmad, Alif Arsyaduddin Ainul Khatimah Ainun Fitrayawati Airlangga, Bramantyo Ali Altway Andhika Djalu Sembada Annisa, Tata Annisah K P, Putik Alaeyda Aparamarta, Hakun Wirawasista Arif Widodo Arnesya Ramadhani Asmayani, Nurul Asyifah, Intan Aulia, Ade Annisa Ausof, Afin Ayu Cahyarani Heksa Az-zahra, Fathih Aqidhatul Azzahra, Eliza B, Kornelia Webliana Bagus Arief Febriansyah Bella Nurainin, Anisa Belly Sam Berlina Yunita Sari Romaji Bertiningrum Cintya Devi Damar Saputri, Sukma Ajeng Darmawan, Raden Deffry Danius Dwi Putra Dhanif, Ahmad Donny Satria Bhuana Dwi Isnaini, Septi DWI RAHMAWATI Dzul Rachman, Dzul Eka Nugraha, Bayu Eka Nur Baiti, Shallivia El Qorny, Ashief Emas, S.Sn.,M.Sn, Cindi Adelia Putri Erni Susanti Fadlilatul Taufany Fadlilatul Taufany Fahmi Fahmi Fahmi Fahrun Nur Rosyid Fauzi, Bella Anastasya Virginia Fauziah, Melinda Nur Firman Kurniawansyah Firman Kurniawansyah Firmansyah Firmansyah Firmansyah, Riffat Gabriella Putri Bonita Harfiza, Junisa Harfiza Hayathi, Nurul HENDRATNO Hendrianie, Nuniek Hidayat , Rahmat Hikmatun Ni’mah Hikmatun Ni’mah I Made Pendi Adi Merta Ibrohim Muhammad Imayuri, Infiona Ratu Imroatul Mufidah, Imroatul Indah Wulansari, Farra Istiq’faroh, Nurul Iswanto, Toto Jaelani, Alan Jannah, Fisabilla Annisatul Jannah, Laila Miftahul Jaya, Rachmad Syifa Kayni, Ika Mareta Nur Khatimah, Khusnul Komaria, Winda Kusdianto Kusdianto Kusumahati, Sari Lailatul Qadariyah Larasati, Wahyu Adinda Luthfi Kurnia &#039;Arifushidqi Marisa, Sonia Mathilda Jowito Pasaribu maulina Zain, Salwa Meka, Wahyu Muhammad Rifa&#039;i Muliati, S.S., M. Si, Dr. Roza Musriha Nailufar, Yuyun Nawangsari, Meita Neni Mariana Ni Made Intan Putri Suari Nuniek Hendrianie Nuniek Hendrianie Nuraliffani, Intan Rizqy Nurdin Amin Nurhadi Nurhaliza, Winarti NURHIDAYATI, SAFITRI Nurkhamidah, Siti Nurlaila Fajar, Novia Nursela, Nisa Nurul Farida Nurul Fatimah Nyamiati, Retno Dwi Oktavianingrum, Eva Okti Sri Purwanti Orchidea Rachmania Pambudi, Alfian Wisnu Pamungkas, Raditya Purwoko, Akhmad Edy Puspita, Rani Herning Putri Mudi, Nabila Putri, Novita Eka Putri, Wilda Amalia Ra'is, Amin Rachman , Dzul Rachmaniah, Orchidea Raden Darmawan Rahmad Bustanul Anwar, Rahmad Bustanul Rahmah, Annisa Alifia Rahmasari Nur Setyono Rahmat Hidayat Rahmawati, Annisa Risma Rifa’i, Muhammad Rifai, Muhammad Ayub Rihhadatul ‘Aisy, Zaki Rizky Tetrisyanda rohayati rohayati Romadani, Anggit Tiyas Fitra Romadhoni, Mohammad Rosmaliati, Rosmaliati Rosyantita, Tania Tri Ryanda Luthfi Zaim Sadaat, Muhammad Ananta Salam, Abdullah Faizurrahman Salasa Ariq Sungkono Salasa Ariq Sungkono Salma, Shabrina Aulia Saputra, Aldhi Rangga Sari Kusumahati Shafriani, Nazula Rahma Silfi Rofiyana, Ari Siti Machmudah Siti Machmudah Siti Nurkhamdah Siti Nurkhamidah Siti Rosyafah, Siti Siti Zullaikah Soejoto Gondo Sri Martuti Sri Rachmania Juliastuti Sri Rachmania Juliastuti, Sri Rachmania Sudarman Sudiyono Marzuki Sumarno . Sunarti Sunarti Susianto Susianto Susianto Susianto Susianto Swaditya Rizki Tamara Idrus, Qonita Tantular Nurtono Toto Iswanto Totok Rochana Tri Putri, Geby Harlia Utari, Sri Utomo, Widya Tri Virdiansyah, Wahyu Fiqih Wahyu Fiqih Virdiansyah Wahyu Meka Wahyuni Eka Muqni Waroka, Linda Ardiya Warsono Sarengat Widiyastuti Winardi, Sugeng Windasari, Suci Wiryanto Wiryanto Wulandari, Febriana Tri Wulandari, Rr.Revani Putri Ayu Zena Syaifillah, Umar Syah Zulfahmi Hawali Zulfahmi Hawali Zulfatun Janah, Dwi Rahma