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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

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.

Circular Economy Approach for Sustainable Tree Litters Waste Management, study case in Universitas Diponegoro Ariyanti, Dessy; Ambariyanto, Ambariyanto; Utama, Yos Johan; Sugianto, Denny Nugroho; Hapsari, Farida Diyah
Journal of Sustainability Perspectives Vol 4, No 2 (2024)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jsp.2024.24809

Universitas Diponegoro, with an open forest area and planted vegetation of 30 – 40%, produced vast amounts of organic waste, especially tree litter. Piles of tree litter are everywhere if it is not properly managed. Universitas Diponegoro has taken a comprehensive approach to handling leaf and tree litter by converting it into economically valuable and beneficial products to meet the objectives of SDGs 12, which are focused on Responsible Consumption and Production. Through the Technical Implementation Unit for Occupational Safety, Health, and Environment (UPT K3L) Universitas Diponegoro has pyrolyzed tree branches to create liquid smoke and anaerobically converted leaf waste into compost. Later, the liquid smoke produced by pyrolysis and compost can achieve the consumer demand standard. In addition, from the policy approach, it is mandatory for every building to handle tree litter surrounds into compost using composting pits and composting bags. The circular economy idea has been incorporated into waste management at Universitas Diponegoro.

Circular Economy Approach for Sustainable Tree Litters Waste Management, study case in Universitas Diponegoro Ariyanti, Dessy; Ambariyanto, Ambariyanto; Utama, Yos Johan; Sugianto, Denny Nugroho; Hapsari, Farida Diyah
Journal of Sustainability Perspectives Vol 4, No 2 (2024)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jsp.2024.24809

Universitas Diponegoro, with an open forest area and planted vegetation of 30 – 40%, produced vast amounts of organic waste, especially tree litter. Piles of tree litter are everywhere if it is not properly managed. Universitas Diponegoro has taken a comprehensive approach to handling leaf and tree litter by converting it into economically valuable and beneficial products to meet the objectives of SDGs 12, which are focused on Responsible Consumption and Production. Through the Technical Implementation Unit for Occupational Safety, Health, and Environment (UPT K3L) Universitas Diponegoro has pyrolyzed tree branches to create liquid smoke and anaerobically converted leaf waste into compost. Later, the liquid smoke produced by pyrolysis and compost can achieve the consumer demand standard. In addition, from the policy approach, it is mandatory for every building to handle tree litter surrounds into compost using composting pits and composting bags. The circular economy idea has been incorporated into waste management at Universitas Diponegoro.

Technical Assessment and Optimization of Off-Gas Cooling in Nickel Matte Pyrometallurgy Based on Carbon Variation Badaruddin, Sabrianah; Alif Nur Laili Rachmah; Taipabu, Muhammad Ikhsan; Farida Diyah Hapsari; Esther Muatiara Santallum Ekklesia Tibalia
Journal of Green Chemical and Environmental Engineering Vol. 2 No. 1 (2026): Journal of Green Chemical and Environmental Engineering
Publisher : Candela Edutech Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63288/jgcee.v2i1.21

Exhaust gas emission management is a critical aspect of pyrometallurgical nickel smelting because it directly affects energy efficiency, operational safety, and overall process sustainability. This study investigates the influence of calcine carbon content on exhaust gas formation and determines the required cooling air volume in an industrial electric furnace operating at approximately 150 tons per hour. The research is based on deterministic mass and energy balance modelling developed from actual operational data obtained from a nickel smelting facility. The analysis quantifies the relationship between carbon oxidation reactions and off-gas generation during the smelting process. Results reveal a strong linear correlation between increasing calcine carbon content and exhaust gas volume. At an average carbon content of 1.96 %, the furnace produces 47,241 Nm³/h of exhaust gas. Under these operating conditions, a cooling air injection of 9,292 Nm³/h is required to reduce the gas temperature from 1000 °C to 800 °C in order to maintain safe furnace operation. The findings demonstrate that precise control of calcine carbon content and optimised cooling air design are essential for improving operational safety and efficiency in nickel smelting. The developed model provides a quantitative basis for designing safer and more efficient industrial off-gas control systems.

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

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.

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