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All Journal Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK METANA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Bulletin of Chemical Reaction Engineering & Catalysis Communications in Science and Technology ASEAN Journal of Chemical Engineering Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Journal Of Sustainability Perspectives Pharmaceutical Sciences and Research (PSR) Journal of Sustainability Perspectives International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Dessy Ariyanti
Department Of Chemical Engineering, Universitas Diponegoro, Semarang 50275, Indonesia
Aerospace Engineering 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 Materials Science & Nanotechnology Public Health

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Journal : Reaktor

 1 
Study on Organic Redox Flow Battery Mechanism using TEMPO and FMN-Na Solutions Faishal Maulana Kusumah; Dita Baeti Pridiana; Peter Kusnadi; Dessy Ariyanti
Reaktor Volume 19 No. 3 September 2019
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.516 KB) | DOI: 10.14710/reaktor.19.3.96-100

Abstract

Among numerous energy storage technologies, redox flow battery is one of the promising technologies that can be used to supply reliable continuation of electricity to electricity grids with a scale up to MW or MWh.  In this paper, the process mechanism and optimization of redox flow battery using organic solution such as Riboflavin-5’-phosphate sodium salt dihydrate (FMN-Na) as anolyte and 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) as catholyte were investigated. Sodium and chloride ions in salt feed were moved respectively to anolyte and catholyte by electrochemical reaction of electrolytes during the charge process and return to the feed during the discharge process. The study was carried out by given electric current with different voltage to graphite electrode range 1,5-10,5 volts and TEMPO concentration 0,02-0,08 M. The result shows that the optimum voltage is 7,5 volts with the concentration of TEMPO 0,06 M. The result also confirms the role of TEMPO solutions in the cathode. In addition to that, the FTIR and SEM analysis to the sedimentation generated during the process also revealed the change of the anolyte and catholyte after charging process.Keywords: Organic; Flow Battery; TEMPO; FMN-Na; energy storage
MODIFIKASI TEPUNG UMBI TALAS BOGOR (COLOCASIA ESCULENTUM (L) SCHOTT) DENGAN TEKNIK OKSIDASI SEBAGAI BAHAN PANGAN PENGGANTI TEPUNG TERIGU Dessy Ariyanti; C Sri Budiyati; Andri Cahyo Kumoro
Reaktor Volume 15, No.1, APRIL 2014
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (457.271 KB) | DOI: 10.14710/reaktor.15.1.1-9

Abstract

Tanaman talas bogor (Colocasia esculentum (L) Schott) sangat mudah dibudidayakan di daerah tropik dan sub-tropik, termasuk Indonesia. Umbi talas bogor kaya akan karbohidrat, sehingga dapat digunakan sebagai sumber energi yang potensial bagi manusia melalui berbagai proses modifikasi. Tujuan dari penelitian ini adalah memperbaiki kualitas tepung umbi talas bogor dengan mengkaji pengaruh konsentrasi suspensi, katalis, oksidator, dan temperatur dari proses modifikasi dengan cara oksidasi menggunakan larutan hidrogen peroksida (H2O2). Variabel yang dikaji adalah suspensi tepung dengan air (40, 30, 20, dan 10%), waktu reaksi (30, 60, 90, dan 120 menit, konsentrasi katalis (0; 0,1%; 0,2%), konsentrasi oksidator (1%, 2% dan 3%) dan temperatur (30; 40; 50oC). Hasil penelitian menunjukkan bahwa penggunaan konsentrasi suspensi 40% , konsentrasi katalis 0,1%, konsentrasi H2O2 2% dan temperatur 30oC pada waktu oksidasi 30 menit memberikan hasil yang paling optimum ditinjau dari daya kembang (swelling power) dengan nilai 7g/g dan kelarutannya dalam air yaitu 4% dengan mempertimbangkan aspek teknis dan ekonomis dari proses. Hasil penelitian ini menunjukkan bahwa penggunaan H2O2 sebagai oksidator cukup efektif dalam meningkatkan nilai daya kembang tepung talas bogor yang sebelumnya hanya 4,3 g/g menjadi 7 g/g, dimana nilai tersebut telah masuk dalam rasio daya kembang tepung terigu yaitu 6,8-7,9 g/g. Namun oksidator H2O2 tidak cukup efektif dalam meningkatkan nilai kelarutan tepung dalam air yang sebelumnya hanya 2% menjadi 4%, dimana nilai tersebut masih dibawah rasio kelarutan tepung terigu yaitu 6,3-7,3%. Selain itu uji organoleptik pada kue kering berbahan baku tepung umbi talas bogor teroksidasi menunjukkan kelemahan berupa rasa yang agak pahit dan tekstur yang terlalu rapuh dibandingkan dengan kue kering yang menggunakan bahan baku tepung terigu.Bogor taro (Colocasia esculentum (L) Schott) is one of the local resources which can be used as raw material for flour and starch production. They are easy to cultivate in tropical and sub-tropical area such as Indonesia. Tubers of Bogor taro contain a lot of carbohydrates and the flour can be modified using several technique of modification in order to achieve the similar content and properties as wheat flour. The objective of this research was to upgrade the quality of tuber Bogor taro flour by studying the effect of suspension consistency (40; 30; 20;10%), concentration of catalyst (0; 0.1%; 0.2%) and H2O2 (1%; 2% and 3%) as oxidizer and temperature of oxidation process (30; 40; 50oC). The results showed that the use of 40% suspension consistency, 0.1% catalyst concentration, 2% H2O2 concentration and 30oC of oxidation temperature at 30 minutes gave the most optimum results in terms of swelling power with 7g/g and water solubility 4% with taking the technical and economic aspects of the process as consideration. Swelling power and water solubility of modified tuber of Bogor taro flour were higher compared to the native ones, which successively 4.3 g/g and 2%. However, in organoleptic analyses showed that the cookies made from modified flour of Bogor taro tuber still have weaknesses such as a bitter taste and fragile textures compared to the cookies made from wheat flour.
A Leak Free Phase Change Materials with Enhanced Thermal Buffering Properties by TiO2/Biochar Ariyanti, Dessy; Huda, Khoirul; Bayu Samudra, Muhammad; Lesdantina, Dina; Adi Saputra, Erwan; Hamzah, Fazlena
Reaktor Volume 23 No.3 December 2023
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.23.3.116-126

Abstract

A leak free organic phase change material of palmitic acid with enhanced thermal buffering properties was synthesized by simple chemical TiO2/biochar encapsulation process. By utilizing the optimum amount of TiO2 as an encapsulation agent the minimalization of leakage phenomena during the phase change process can be achieved with the value 20-25% of weight loss. Furthermore, the additional sugar cane bagasse-based biochar that was introduced to the encapsulation system acts as a support matrix that enhances further the leakage properties into free leak category with the percentage of weight lost 1.1-1.4 %. Moreover, the introduction of sugar cane bagasse-based biochar in the encapsulation system of the palmitic acid PCM can improve the thermal buffering properties by keeping a package box temperature in the range of 2-80C for more than 20 h by means small increment of temperature 0.72oC/h.  Keywords: PCM, encapsulation, palmitic acid, thermal buffering, leakage
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
Co-Authors Adi Saputra, Erwan Adrianus Kristyo Prabowo, Adrianus Kristyo Afiatin Afiatin Agnes Priska Tiarasukma Aji Prasetyaningrum Ambariyanto , Andri Cahyo Kumoro Aprilina Purbasari Apsari Puspita A. Azizah, Nadya Ummi Bakti Jos Bayu Samudra, Muhammad C Sri Budiyati Catarina Sri Budiyati Denny Nugroho Sugianto Desiyantri Siti P. Diah Susetyo Retnowati Dita Baeti Pridiana Erwan Adi Saputro Faishal Maulana Kusumah Filicia Wicaksana H Hadiyanto Hamzah, Fazlena Handayani, Elinna Putri Hapsari, Farida Diyah Heny Kusumayanti Herman Suryadi I N. Widiasa Intan Nurcahyani Junye Dong Junzhe Dong Khoirul Huda Lesdantina, Dina Maksum Radji Marcelinus Christwardana Mo’ungatonga, Satriani Noer Abyor Handayani Peter Kusnadi Purwanto Purwanto Purwoko, Agus Pury Diana Shintawati Saputra, Erwan Adi Setia Budi Sasongko Slamet Priyanto Srivastava, Vimal Chandra Wei Gao Wei Gao Wei Gao Yos Johan Utama