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All Journal Reaktor International Journal of Renewable Energy Development TEKNIK METANA JURNAL KIMIA SAINS DAN APLIKASI JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Kimia dan Kemasan Majalah Ilmiah MOMENTUM ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Inovasi Teknik Kimia Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Jurnal Teknik Kimia Indonesia Jurnal Kimia dan Kemasan Jurnal Pengabdian Vokasi Jurnal Profesi Insinyur Indonesia International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Aprilina Purbasari
Departemen Teknik Kimia, Fakultas Teknik, Universitas Diponegoro
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 Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Transportation

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Characteristics of all organic redox flow battery (AORFB) active species TEMPO-methyl viologen at different electrolyte solution Ariyanti, Dessy; Purbasari, Aprilina; Hapsari, Farida Diyah; Saputra, Erwan Adi; Hamzah, Fazlena
International Journal of Renewable Energy Development Vol 13, No 5 (2024): September 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60155

Abstract

The practice of using wind and solar energy to generate electricity represents a solution that would be beneficial for the environment and ought to be explored. However, in order to ensure users' stability and continuous access to electricity, the increasing usage of renewable energy needs to align with the advancement of energy storage technologies. Redox flow batteries, which use an organic solution as the electrolyte and a proton exchange membrane as an ion exchange layer, are currently the subject of extensive research as one of the alternative renewable energy storage systems with the benefit of a techno economy. This study investigated the solubility of organic solution, namely 2,2,6,6-Tetramethylpiperidinyloxy or 2,2,6,6-Tetramethylpiperidine 1-oxyl (TEMPO) and methyl viologen (MV) in various essential electrolyte solutions such as NaCl, KCl, KOH, and H2SO4 that can be used as electrolytes of all organic redox flow battery (AORFB) system to produce high energy density and charging and discharging capacity. The result shows the optimum condition for effective charge transfer in AORFB is TEMPO catholyte and MV anolytes in the 0.08 M H2SO4electrolyte solution. Additionally, a correlation between the acquisition of electrolyte solutions on TEMPO catalyst and MV anolytes was discovered by the data. Electrolyte solution can improve electrical conductivity in TEMPO solution, which in turn can improve the efficiency of AORFB charging and discharging. Contrarily, MV anolytes exhibit a different pattern where the addition of electrolyte solutions reduces their electrical conductivity. RFBs systems with the aforementioned catholyte and anolyte can be used to store solar energy with a maximum current of 0.6 A for 35 minutes. Storage effectiveness is characterized by a change in colour in the catholyte and anolyte. The findings firming the possibility of using AORFB as one of the alternative energy storage systems that can accommodate the intermittence of the renewable energy input resource. 
Sedimentation Process of TiO2 Nanoparticles in Aqueous Solution Ariyanti, Dessy; Purbasari, Aprilina; Lesdantina, Dina; Saputro, Erwan Adi; Gao, Wei
Reaktor Volume 22 No.2 August 2022
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.22.2.70-76

Abstract

TiO2 nanoparticles, a semiconductor photocatalyst is widely used in various applications especially for water treatment. The common problems for the application are separating the nanoparticles from the water body and recovering it to be reused. This research was conducted to investigate the aggregation and sedimentation properties of TiO2 nanoparticles via chemical addition. The experiment was carried out for 5 hours by varying the pH, ionic strength, and the addition of organic matter such as rhodamine B, methylene orange, and humic acid. The results indicate that pH and ionic strength greatly affect the TiO2 sedimentation process. Sedimentation can be formed properly when the solution is at pH 1 and 14, this happens because pH is close to the isoelectric point. Meanwhile, ionic strength with a concentration of 0.1 M gave the most optimal results in TiO2 sedimentation. In the presence of ionic strength with the appropriate concentration, the thickness of the electrical double layer particles can be reduced so the attractive force increases and sedimentation occur. Meanwhile, in the presence of organic matter, rhodamine B, methylene orange, and humic acid did not significantly affect the formation of TiO2 sedimentation.Keywords: titanium dioxide, sedimentation, ionic strength, isoelectric point, water treatment
PEMANFAATAN ABU TERBANG SEBAGAI GEOPOLIMER UNTUK ADSORPSI LOGAM BERAT Mn Aprilina Purbasari; Nita Aryanti; Vitus Dwi Yunianto; Budi Ismadi
Jurnal Inovasi Teknik Kimia Vol 9, No 4 (2024)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v9i4.11322

Abstract

Geopolimer merupakan polimer anorganik yang tersusun dari ikatan Si-O-Al. Geopolimer dapat diperoleh dari material alumino-silikat seperti abu terbang yang direaksikan dengan aktivator alkali. Pada penelitian ini, abu terbang yang merupakan limbah padat dari proses pembakaran batubara dimanfaatkan sebagai geopolimer dengan aktivator alkali campuran larutan NaOH 10 N dan larutan natrium silikat. Geopolimer yang diperoleh digunakan untuk mengadsorpsi logam berat mangan (Mn). Faktor-faktor yang mempengaruhi proses adsorpsi, yaitu konsentrasi awal larutan logam berat Mn dan waktu kontak, dipelajari pada penelitian ini selain dilakukan juga kajian isoterm dan kinetika adsorpsi. Hasil yang diperoleh menunjukkan bahwa semakin tinggi konsentrasi awal larutan logam berat Mn maka semakin rendah efisiensi adsorpsi yang diperoleh. Sementara itu proses adsorpsi logam berat Mn oleh geopolimer mencapai kesetimbangan setelah 120 menit. Berdasarkan kajian isoterm dan kinetika adsorpsi yang telah dilakukan, adsorpsi logam berat Mn oleh geopolimer dari abu terbang mengikuti model isoterm Langmuir dan model kinetika order dua semu.
PEMANFAATAN ABU TERBANG SEBAGAI GEOPOLIMER UNTUK ADSORPSI LOGAM BERAT Mn Aprilina Purbasari; Nita Aryanti; Vitus Dwi Yunianto Budi Ismadi
Jurnal Inovasi Teknik Kimia Vol. 9 No. 4 (2024)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v9i4.12510

Abstract

Geopolimer merupakan polimer anorganik yang tersusun dari ikatan Si-O-Al. Geopolimerdapat diperoleh dari material alumino-silikat seperti abu terbang yang direaksikan denganaktivator alkali. Pada penelitian ini, abu terbang yang merupakan limbah padat dari prosespembakaran batubara dimanfaatkan sebagai geopolimer dengan aktivator alkali campuranlarutan NaOH 10 N dan larutan natrium silikat. Geopolimer yang diperoleh digunakan untukmengadsorpsi logam berat mangan (Mn). Faktor-faktor yang mempengaruhi proses adsorpsi,yaitu konsentrasi awal larutan logam berat Mn dan waktu kontak, dipelajari pada penelitianini selain dilakukan juga kajian isoterm dan kinetika adsorpsi. Hasil yang diperolehmenunjukkan bahwa semakin tinggi konsentrasi awal larutan logam berat Mn maka semakinrendah efisiensi adsorpsi yang diperoleh. Sementara itu proses adsorpsi logam berat Mn olehgeopolimer mencapai kesetimbangan setelah 120 menit. Berdasarkan kajian isoterm dankinetika adsorpsi yang telah dilakukan, adsorpsi logam berat Mn oleh geopolimer dari abuterbang mengikuti model isoterm Langmuir dan model kinetika order dua semu.
Chemically activated biochar derived from mangrove litter with enhanced CO2 adsorption capacity for carbon sequestration Ariyanti, Dessy; Syifa, Viona; Hapsari, Farida Diyah; Widiasa, I Nyoman; Widayat, Widayat; Silviana, Silviana; Purbasari, Aprilina; Setiabudi, Herma Dina; Hamzah, Fazlena
International Journal of Renewable Energy Development Vol 15, No 3 (2026): May 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.62059

Abstract

Overcoming climate change is crucial to ensure environmental sustainability. This research focuses on the development of chemically activated biochar (CAB) from mangrove litters that can be used for CO2 adsorption, which leads to reducing the impacts of climate change. The synthesisation of CAB was carried out via pyrolysis at 400℃ for 2 hours under nitrogen gas flow, followed by treatment using various activating agents (0.1 M of H2SO4, HCl, KOH, and NaOH) for 2 hours with a biochar-to-solution ratio of 1 g : 4 mL. The activation process was designed to enhance surface area, pore characteristics, and functional groups associated with CO2 adsorption performance. The observation on the characteristics of CAB using Scanning Electron Microscope and Energy Dispersive X-Ray (SEM-EDX), The Brunauer, Emmett, Teller and Barret-Joyner-Halenda (BET-BJH), Fourier Transform Infrared Spectroscopy (FTIR), CHN Analyser, and static batch CO2 adsorption tests shows the ability of CAB in capturing CO2 through several possible mechanism. Among the samples, KOH-activated biochar (B-KOH) exhibited the highest CO2 adsorption capacity, reaching 12.47 mmol CO2 g-1 biochar. This high performance is attributed to a potassium (K) composition of 9.74%, which effectively catalyzed the development of a microporous structure, resulting in a micropore volume of 5.927 x 10-3 cm3/g and an optimized average pore width of 1.543 nm. Furthermore, B-KOH maintained the highest O-H group area (1.533 a.u. x cm-1), enhancing its affinity for CO2 molecules. This research offers an innovative and practical solution to reduce greenhouse gases and is expected to have a significant impact, both locally and globally, in advancing sustainable development.
A Brief Overview of Corrosion Prevention and Inhibition: Past, Current and Future Technologies Fauzan, Ahmad -; Kumoro, Andri Cahyo; Purbasari, Aprilina; Abidin, Kharis Yohan
Reaktor Volume 25 No.3 December 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.3.%p

Abstract

Corrosion is a process that degrades metal-based materials as a result of chemical reactions with their surrounding environment. For that reason, it causes serious problems across various industries, namely reduced material quality, increased maintenance costs, and extensive safety concerns. This paper presents a concise overview of corrosion prevention and inhibition methods, focusing on key strategies, such as material selection and the use of protective coatings, cathodic protection, and corrosion inhibitors. Furthermore, nano coatings, eco-friendly inhibitors, smart materials, corrosion modelling, and self-healing materials are also discussed as part of current advancements. In-depth understanding and appropriate implementation of these suggested methods are essential for extending material lifespan and improving operational efficiency of the overall industrial systems.            
Co-Authors . Suherman . Widayat Afiatin Afiatin Afri Yenni Agnesia Permatasari Alice Pramashinta Andri Cahyo Kumoro Anissa Ardanti Wulandari Ariestya Meta Devi Arif Fajar Utomo Aulia Beta Safira Ayyubi, Shalahudin Nur Budi Ismadi Budiyono Budiyono Darmaji, Timothius Adrian Christantyo Dessy Ariyanti Dessy Ariyanti Didi Dwi Anggoro Ekky Febri Ariani Erwan Adi Saputro Faleh Setia Budi Fauzan, Ahmad - Fikri Mudzakir Marasabessy Hafsah Fajrin Aprilianti Hamzah, Fazlena Hapsari, Farida Diyah Hargono Hargono Heny Kusumayanti Heny Kusumayanti Herry Santosa Heru Susanto I Nyoman Widiasa Kharis Yohan Abidin, Kharis Yohan Kristinah Haryani Laeli Kurniasari Lesdantina, Dina Lukman Atmaja Lulluil Mahsunnah Luqman Buchori M. Djaeni Machmud Lutfi H Margaretha Praba Aulia Mira Amalia Hapsari Muhammad Adi Irawan Muslim, Aristianto Nita Aryanti Nita Aryanti Noer Abyor Handayani Noer Abyor Handayani Nungki Primastuti Pratama, Pambudi Pajar Pratiwi, Wahyu Zuli Purwanto Purwanto Purwanto Purwanto Pury Diana Shintawati Raizka Kharisma Mediani Ratnawati Ratnawati Restu Kusumawardani Rini Kusumawati Samadhi, T Walmiki Saputra, Erwan Adi Sary, Cindy Nella Setia Budi Sasongko Setiabudi, Herma Dina Shalahudin Nur Ayyubi Silviana Silviana Silviana Silviana Silviana Silviana Siswo Sumardiono Slamet Priyanto Sri Rukiyawati Suherman Suherman Syifa, Viona Titik Istirokhatun Tjokorde Walmiki Samadhi Tjokorde Walmiki Samadhi Tjokorde Walmiki Samadhi Tkokorde Walmiki Samadhi Tutuk Djoko Kusworo Vitus Dwi Yunianto Vitus Dwi Yunianto Budi Ismadi Wei Gao Wisnu Jati N Wulandari Dharsono Y. Saptiana Oktari Yazid Bindar Yazid Bindar Yustina Linasari