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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan CHEMICA Jurnal Teknik Kimia Journal of Natural Sciences and Mathematics Research CHEESA: Chemical Engineering Research Articles Walisongo Journal of Chemistry Jurnal Riset Teknologi Pencegahan Pencemaran Industri Jurnal Energi Baru dan Terbarukan Jurnal Rekayasa Proses Digital Learning, Social Science, and Life-course Studies
Ramandani, Adityas Agung
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences

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Advanced oxidation processes technology using the Fenton method in Bakung landfill leachate treatment Teguh, Dedi; Cendekia, Devy; Wulandari, Yeni Ria; Putri, Cynthia Eka; Ramandani, Adityas Agung
Journal of Natural Sciences and Mathematics Research Vol. 10 No. 2 (2024): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.v10i2.20987

Abstract

The primary issue at the Bakung final processing location was the high organic and inorganic material concentration. Toxicity, high chemical oxygen demand (COD), a black hue, and an unpleasant smell can usually identify landfill leachate; it can be hazardous if spilled directly into a body of water. Consequently, the implementation of an efficient leachate treatment was necessary. One use of this cutting-edge oxidation process technology consists of the Fenton method for treating leachate. The goals of this study involve implementing the Fenton technique to leachate treatment and ascertaining the impact of reaction time (30, 60, 90, or 120 min) and Fenton molar ratio (1:150, 1:200, or 1:250) on color degradation and chemical oxygen demand (COD). A Fenton molar ratio of 1:150 and a 120-min reaction period were ideal, resulting in maximum color and COD degradation percentages of 91.4% and 92.4%, respectively. The study's findings demonstrate how well the Fenton approach works to reduce COD and color in leachate while also meeting leachate water quality requirements for enterprises and/or ultimate waste processing operations.
Enhancing Social Studies Achievement through the Make a Match Cooperative Model: The Moderating Role of Student Motivation Putri, Herma Kurnia; Risdianto, Eko; Ramandani, Adityas Agung
Digital Learning, Social Science, and Life-course Studies Vol. 1 No. 1 (2025): June 2025
Publisher : WISE Pendidikan Indonesia

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Abstract

This study investigates the effectiveness of the Make a Match cooperative learning model in enhancing social studies achievement among seventh-grade students, while considering student motivation as a moderating variable. Employing a quasi-experimental design with a pretest-posttest control group, the study involved 84 students from Al-Azhar 3 Junior High School in Bandar Lampung, Indonesia, who were divided into experimental and control groups using cluster random sampling. Data were collected through a validated achievement test and a motivation questionnaire, then analyzed using ANOVA and independent samples t-tests. The findings indicate that the Make a Match model significantly improves student learning outcomes compared to traditional methods, particularly for students with high motivation. Conversely, students with low motivation benefited more from the Jigsaw model, highlighting a critical interaction effect between instructional strategy and learner characteristics. These results underscore the importance of aligning pedagogical approaches with students’ motivational profiles to optimize academic achievement. The study contributes to the literature on differentiated instruction and cooperative learning by emphasizing the nuanced interplay between teaching methods and student motivation.
Characteristics of Liquid Sugar from Cassava Flour Using Gelatinization, Liquefaction and Enzymatic Saccharification (amyloglucosidase and α-amylase) Processes Agustina, Tika; Elsyana, Vida; Alvita, Livia Rhea; Ramandani, Adityas Agung; Purnani, Mawar Siti
Walisongo Journal of Chemistry Vol. 7 No. 1 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i1.20458

Abstract

Domestic sugar production is still insufficient to satisfy the national demand for sugar, and production costs are expensive. One of the ingredients that can be used to make liquid sugar is starch. This study aims to determine the response of the resulting reduced sugar by optimizing the substrate concentration, liquefaction, and saccharification time. The method used of Box Behnken Design (BBD) with combinations of 20, 30, and 40% substrate concentrations, liquefaction times of 20, 40, and 60 min, and saccharification times of 20, 40, and 60 min. The characteristics of cassava flour, such as moisture (9.208 ± 0.068%), ash (0.987 ± 0.001%), fiber (2.187 ± 0.033%), and starch (79.876 ± 0.000%), were satisfied on SNI 01-2905-1992. Liquid sugar made from cassava flour reduced the sugar content by 28.299 ± 0.101%. The optimal conditions were 40% substrate concentration, 60 min liquefaction time, and 60 min saccharification time. The characteristics of the validation liquid sugar are in accordance with the specifications for the quality requirements of SNI 01-2978-1992 in the form of moisture content, ash content, and reducing sugar of 5.194 ± 0.003%, 0.996 ± 0.000%, and 29.668 ± 0.761%, respectively. These results highlight the effectiveness of optimizing substrate concentration, liquefaction time, and saccharification time in producing high-quality liquid sugar from cassava flour. This optimization addresses the domestic demand for sugar. It provides a cost-effective solution by utilizing cassava flour, thereby supporting the local agricultural economy and potentially reducing reliance on imported sugar.
Synthesizing and Performance Testing of Zn Promoted Ni Catalyst With γ-Al2O3 Support in The Process of Hydrotreating Used Cooking Oil into Green Diesel Kopli, Faizal Zul; Fadel Kurnia Artha; Ismeini, Ismeini; Erlinawati, Erlinawati; Ramandani, Adityas Agung; Efendi, Dimas Amirul Mukminin Nur
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 15 No. 1 (2024): May
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2024.v15.no1.p41-49

Abstract

Green diesel was a mixture of straight-chain and branched-chain alkanes, typically mostly 15 to 18 carbon atoms per molecule (C15 to C18) extracted from the hydrotreating process of vegetable oils. In this study, a catalyst of Nickel (Ni) promoted Zinc (Zn) supported by Alumina (Al2O3) was used. The catalyst was made by varying the use of and without the Zn promoter in the catalyst. Catalyst tested for Scanning Electron Microscope characterization. For the 60Ni/Al2O3 catalyst, the total area was 51,575.51 m2/gr, while for the 15Ni-45Zn/Al2O3 catalyst, the total area was 20.577,55 m2/gr. Furthermore, a performance test of the catalyst was also carried out using a green diesel reactor with a temperature of 400°C and a pressure of 20 bar, the percentage yield on the 60Ni/Al2O3 catalyst was 25.73% while the 30Ni-30Zn/Al2O3 catalyst was 23.60%. The 60Ni/Al2O3 catalyst has the following properties: physical properties such as density, viscosity, flash point, cetane number, and acid number of 765.17 ± 0.249 kg/m3, 3.55 ± 0.076 mm2/s, 60.73 ± 0.170°C, 88.10 ± 0.648 CN, and 0.33 ± 0.76 mgKOH/g, respectively. The 15Ni-45Zn/Al2O3 catalyst has the following properties: physical properties such as density of 766.77 ± 0.679 kg/m3, viscosity of 66.13 ± 0.249 mm2/s, flash point of 2.92 ± 0.011°C, cetane number of 82.33 ± 0.386, and acid number of 82.33 ± 0.386 mgKOH/g.
Formation of Phosphate Crystals from Cow Urine Using Aeration System Batch Reactor Fadilah, Reza; Hanifah, Windia; Cendekia, Devy; Ramandani, Adityas Agung
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26595

Abstract

The waste generated from the livestock sector is cow urine containing nitrogen, sulfur, phosphate, ammonium, sodium, manganese, iron, silica, chlorine, magnesium and calcium. The aim of this research is to reduce phosphate levels which will have an impact on the environment caused by cow urine which contains phosphate and ammonium and forms phosphate crystals using a batch reactor with an aeration system. The results of wastewater treatment using a batch reactor produce precipitate in the form of phosphate crystals which can be used as fertilizer for plants. This study used a completely randomized design (CRD) with two repetitions, namely with a comparison of the rate of aeration (air flow) 1 Lpm, 1.5 Lpm and 2 Lpm with the time used, namely 0 minutes, 60 minutes, 120 minutes, 180 minutes and 240 minute. Based on research that has been done, the highest aeration rate (air flow) in phosphate removal in cow urine waste is at 1 Lpm air flow with a time of 240 minutes and a phosphate removal efficiency of 84.8822%. Meanwhile, at an air flow of 1.5 Lpm with a time of 60 minutes and a phosphate removal efficiency of 95.4315%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%. At an air flow of 2 Lpm with a time of 240 minutes, the removal efficiency can only be 34.3421%. The content of phosphate crystals obtained from the XRF results was obtained at 3.173%.
Utilization of Bamboo Waste by Engineering Acid Hydrolysis (H2SO4) to Produce Furfural Compounds Fitri, Nur Hidayatul; Ramandani, Adityas Agung; Cendekia, Devy; Teguh, Dedi
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.26609

Abstract

Bamboo waste containing lignocellulosic can be used as a material for forming furfural compounds. Furfural is an intermediate product that is widely needed by the chemical industry in the manufacture of finished products such as resins, disinfectants, lubricating oils, synthetic rubber, and so on. This product can be produced from materials containing pentosan. The purpose of this study was to determine the effect of the delignification process on pentosan levels,yield and characterization of the resulting furfural, as well as the potential of pentosan to become furfural compounds. In this study the formation of furfural from bamboo waste was carried out using the acid hydrolysis method, with the independent variables namely cooking temperatures of 90 oC, 100 oC and 110 oC, H2SO4 concentrations of 5%, 10% and 15% and cooking times of 60 minutes, 90 minutes , and 120 minutes. Based on the results of research that has been done, it is known that the delignification process has an influence on the pentosan level, where the sample without delignification obtained a pentosan level of 11.10% and using the delignification process obtained a pentosan level of 14.67%. Characterization of furfural analysis results by color test showed a change in color to red and based on the results of GC-MS analysis at retention time 24.
Industrial wastewater treatment using venture injector type Micro-bubble aeration as a reduction of dissolved Iron (Fe2+) levels Efendi, Dimas Amirul Mukminin Nur; Ramandani, Adityas Agung; Cendekia, Devy; Hanifah, Windia
Journal of Natural Sciences and Mathematics Research Vol. 9 No. 2 (2023): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

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Abstract

Water quality problems that are often encountered, especially by-product wastewater resulting from industrial processes that do not meet the requirements for wastewater quality standards. Iron levels in wastewater can cause the water to turn brownish yellow and produce an unpleasant odor, which of course has a big impact on the environment. Therefore, it is necessary to implement a treatment process to reduce the iron level in the water, ensuring that the water is safe when discharged into the environment. The purpose of this research is to analyze the initial parameters of temperature, pH, TDS, TSS, dissolved oxygen (DO) and dissolved iron (Fe2+) in industrial waste water and then wanted to know whether the venture injector type micro bubble aeration process was able to increase the value of dissolved oxygen (DO) and decrease the dissolved iron content (Fe2+) in wastewater and to know the micro bubble type aeration process Venture injectors are the best to use. The research was conducted with an experimental design using a completely randomized design (RAL) with two factors: air flow (2 LPM, 4 LPM, and 6 LPM) and aeration time (0 minutes, 15 minutes, 30 minutes, 45 minutes, and 60 minutes), each with two repetitions. In the results of the initial parameter analysis, the pH value was 8.02 (alkaline), the temperature value was 28°C, the TDS value was 1548.3 mg/L, the TSS value was 291 mg/L, the DO value was 0.1 mg/L and dissolved iron (Fe2+) of 7.453 mg/L. After conducting research, it was found that the venture injector type micro bubble aeration process was able to increase the value of dissolved oxygen (DO) and reduce dissolved iron (Fe2+) in industrial waste water, the best increase in dissolved oxygen (DO) at 6 LPM air flow for 60 minutes was able to increase oxygen dissolved (DO) to 2.40 mg/L. The most efficient and effective reduction in the value of dissolved iron (Fe2+) at 6 LPM air flow with a time of 15 minutes was able to reduce the value of dissolved iron by 84.42%.
Characteristics candlenut shell-based activated Carbon for reduction Iron (Fe) in surface water from Bratasena Tulang Bawang, Lampung Elisa, Elisa; Shintawati, Shintawati; Afifah, Dian Ayu; Ramandani, Adityas Agung
Journal of Natural Sciences and Mathematics Research Vol. 10 No. 1 (2024): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

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Abstract

Candlenut shells are only used as fuel, and some are thrown away, so their use has not been maximized. Because of their high carbon content, candlenut shells may be used to create adsorbents. This study looks at how different activator concentrations of KOH activators can be used to make adsorbents from candlenut shells. The study will investigate how various activator concentrations affect the ability of adsorbents based on candlenut shells to bind molecules. Furthermore, the investigation will examine the possible uses of these adsorbents in diverse sectors, including air purification and wastewater treatment. This research was carried out using the Completely Randomized Design (CRD) method, which consisted of 1 activator KOH concentration of 0.5 M, 1 M, 1.5 M, 2 M, and 2.5 M with 3 replications each. The finding demonstrated that adsorbent products activated with 0.5 M KOH yield the highest quality and satisfied SNI 06-3770-1995 requirements for an ash and water content of 10.21% and 0.98%, respectively. The adsorbent product has an iodine absorption capacity of approximately 639.39 mg/g, comparable to SNI 06-3770-1995. For iron metal, the adsorbent product exhibits an adsorption capacity and absorption efficiency of 0.14 mg/g and 98.30%, respectively. The Freundlich adsorption isotherm model is suitable for this investigation, with a Kf value of 0.14 mg/g and an R2 of 0.9999.
Co-Authors Afifah, Dian Ayu Afifah, Meita Agustina, Tika Aji, Salomo Pranata Alvita, Livia Rhea Arief, Febrina Cendekia, Devy Dahlan, Astryd Viandila Didik, Nurjan Efendi, Dimas Amirul Mukminin Nur Eko Risdianto Elisa Elisa Elsyana, Vida Erlinawati Erlinawati, Erlinawati Fadel Kurnia Artha Fadian Farisan Silmi Fadilah, Reza Fitri, Nur Hidayatul Hanifah, Windia Herlambang, M. Julian Indah Maulidia, Indah Indradewa, Rhian Ismeini, Ismeini Kopli, Faizal Zul Oktaf Rina Prihatini, Chindy Aulia Purnani, Mawar Siti Putri, Cynthia Eka Putri, Herma Kurnia Ricky Fernando Shintawati shintawati, shintawati Siti Purnani, Mawar Sudibyo Sudibyo Sukma, Vinda Avri Sunarsi, Sunarsi Syamsuri, Iyappateya Gelegar Dirgantara Teguh, Dedi