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All Journal Jurnal Rekayasa Proses International Journal of Renewable Energy Development CALYPTRA : Jurnal Ilmiah Mahasiswa Universitas Surabaya Jurnal Bahan Alam Terbarukan Seminar Nasional Teknik Kimia Kejuangan Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Communications in Science and Technology Jurnal Rekayasa Proses MIZAN, Jurnal Ilmu Hukum Jurnal Pengendalian Pencemaran Lingkungan (JPPL) IBLAM Law Review Jurnal Teknologi Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Sains Materi Indonesia Jurnal Rekayasa Proses Malahayati International Journal of Nursing and Health Science Jurnal Pengabdian, Riset, Kreativitas, Inovasi, dan Teknologi Tepat Guna (Parikesit)
Teguh Ariyanto
Chemical Engineering Department, Universitas Gadjah Mada, Jl. Grafika, No. 2, Yogyakarta 55281
Religion Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Nursing Physics Public Health Social Sciences

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Effect of Presence of Ammonia in Aqueous Solution on Urea Adsorption Capacity Using Porous Carbon Prasetyo, Imam; Rahayu, Theresia Evila Purwanti Sri; Ariyanto, Teguh
Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Vol. 1 No. 01 (2019): JPPL, September 2019
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M), Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jppl.v1i01.47

Abstract

Urea is the main source of nitrogen for plants. Conventional urea fertilizer is made by reacting ammonia and carbon dioxide. Wastewater produced by urea fertilizer plants usually contains urea and ammonia in high concentrations. In each m3 of wastewater urea content can reach 650 - 4000 ppm and ammonia amounting to 100 - 1300 ppm. The disposal of wastewater that still contains urea and ammonia with high levels can cause eutrophication in waters which is very detrimental to aquatic organisms. The uptake of urea in the urea fertilizer plant wastewater is an interesting study because it can provide a double benefit of reducing the concentration of urea in wastewater so that it can meet environmental quality standards that are environmentally friendly and obtain cheap urea fertilizer for plants. This study aims to determine the adsorption capacity of urea with porous carbon if there is ammonia in the liquid. Porous carbon is made from pyrolysis of coconut shell which is oxidized with sulfuric acid. The oxidation process is carried out by heating porous carbon which is immersed in a 50% w/w sulfuric acid solution at 90oC for 2 hours. The adsorption process is carried out at room temperature with an initial concentration of urea between 500 - 8000 ppm in a solution of urea-ammonia as a simulated liquid. The results showed that the urea adsorption capacity increased significantly in urea-ammonia solution compared to urea solution with an increase of 41%. The capacity of urea adsorption in urea-ammonia solution is 27 - 444 mg urea / g carbon.
Penjerapan Natrium pada Hasil Ekstraksi Silika dari Lumpur Panas Bumi Akmal, Afiffurroyan Aflah; Purnomo, Chandra Wahyu; Ariyanto, Teguh
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

Geothermal sludge contains silica which can be used as plant fertilizer. Extraction of silica from geothermal sludge can be carried out by the extraction method using sodium hydroxide solution to form sodium silicate. This extraction was conducted by varying the extraction time of 10, 20, 30, 40, 50, 60, 70 and 80 minutes; NaOH concentration of 1,5N; and extraction temperature of 80oC. Extracted silica concentration was analyzed using UV-Vis Spectrophotometry. The best extracted silica content was 158673 ppm under 60 minutes of extraction time, 80oC of extraction temperature, and 1.5N of NaOH concentration. The results of this extraction still contain sodium at a concentration and need to be reduced so that it can be used as fertilizer. The process of reducing sodium concentration using the ion exchange method in a batch system. This process uses variations of initial sodium concentration with a resin mass of 20 grams and temperature of 45oC. From the Atomic Adsorption Spectroscopy (AAS) analysis, the adsorption capacity (qe) increases with increasing the initial sodium concentration. Langmuir's equilibrium provide a match to the adsorption equilibrium experimental data.
Evaluating the implementation of hospital management information systems based on the DeLone and McLean model: A systematic review Ariyanto, Teguh; Aji, Budi; Intiasari, Arih Diyaning
Malahayati International Journal of Nursing and Health Science Vol. 8 No. 8 (2025): Volume 8 Number 8
Publisher : Program Studi Ilmu Keperawatan-fakultas Ilmu Kesehatan Universitas Malahayati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/minh.v8i8.1609

Abstract

Background: The evaluation of information system success continues to attract attention from researchers, practitioners, and management stakeholders alike. Gaining a clear understanding of this success is essential, as it underscores the system’s value and informs future decision-making related to its implementation and improvement. Several methods exist for measuring information system (IS) success, with the DeLone and McLean IS Success Model (D&M model) being the most widely recognized and validated framework. Purpose: To evaluate the effectiveness of Hospital Information Systems (HIS) based on the DeLone and McLean Information Systems Success Model in various healthcare settings. The research focuses on identifying key success factors, challenges in adoption, and implications for future HIS implementations. Method: A systematic review was conducted across five articles published between 2017 and 2024, sourced from Saudi Arabia (1 paper, 20%), Nigeria (1 paper, 20%), South Africa (1 paper, 20%), and Indonesia (2 papers, 40%). The articles were assessed using the DeLone and McLean model, which includes six core dimensions: system quality, information quality, service quality, user satisfaction, usage, and net benefits. Data were collected through user satisfaction surveys, Structural Equation Modeling (SEM), and Partial Least Squares (PLS) techniques. A total of 2,441 participants were involved, including 1,784 healthcare professionals and 657 health information management staff. Results: Findings show that system quality is the most significant factor influencing HIS success, with a positive correlation coefficient of 0.87 between system quality and user satisfaction (p < 0.01). A study in South Africa demonstrated that information quality significantly influenced system usage (β = 0.65, p < 0.05), while service quality impacted user satisfaction with a coefficient of 0.73 (p < 0.01). In Nigeria, although system quality was associated with net benefits (β = 0.53, p < 0.01), user satisfaction did not directly correlate with these benefits (p > 0.05). Common adoption challenges included network disruptions and data storage problems, which were reported in 35% of hospitals using SIMRS in Indonesia. Conclusions: For future HIS implementations to succeed, healthcare institutions must prioritize improving system quality, enhancing information quality, and strengthening service quality. Addressing technical and training challenges will be crucial in overcoming adoption barriers and ensuring the long-term success of HIS.
Modification of HZSM-5 with Phosphotungstate, Silver, and Cobalt to Enhance Catalytic Reaction of Bioethanol to Bioethylene Risnawati, Dhea Atika; Pradana, Nova Yoga; Rochmadi, Rochmadi; Prasetyo, Imam; Saputra, Daffa Dewa; Pranamuda, Hardaning; Tandio, Sugianto; Ariyanto, Teguh
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20604

Abstract

Developing an optimal catalyst formulation is a critical challenge in expanding sustainable ethylene production and utilization as a chemical intermediate product. Metal oxide impregnation (silver nitrate (AgNO3), cobalt nitrate (Co(NO3)2), and phosphotungstic acid (H3PW12O40)) was used to enhance the catalytic performance of HZSM-5 by increasing active sites and acidity. The preparation of the catalyst was performed by the impregnation of various metals and amounts of loading particles inside the pores of HZSM-5. The particles were impregnated by incipient wetness impregnation and followed by calcination to obtain Ag/HZSM-5, Co/HZSM-5, and W/HZSM-5 catalysts. Characterization techniques, including N2 adsorption-desorption, SEM, and XRD, were used to analyze the catalyst properties. Catalytic performance was evaluated in a packed-bed reactor under varying reaction conditions at WHSV 1.8 h-1. The aim of this research is to identify optimal catalyst formulations that exhibit superior activity in both conversion and selectivity towards ethylene production. Modified HZSM-5 catalysts incorporating Ag, Co, and W exhibited enhanced catalytic performance for bioethanol dehydration to bioethylene, attributed to optimized acidic sites, pore structure, and metal synergy. The 1%W/HZSM-5 catalyst demonstrated superior ethylene conversion (98.2%) and selectivity (99.88%) at 300 ℃. Increasing tungsten loading up to 2% impacted the conversion of bioethanol. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Synthesis of Ternary Nanocomposites of MnO2/PANI/Maxsorb and their Performance as an Electrode Material for Supercapacitors Nur'aini, Aprilianti; Prasetyo, Imam; Ariyanto, Teguh
Journal of Mathematical and Fundamental Sciences Vol. 57 No. 2 (2025)
Publisher : Directorate for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2025.57.2.2

Abstract

Increasing performance of supercapacitors can be achieved by using a composite of electrode materials. Nevertheless, selecting appropriate materials and determining the optimal combination composition remain significant challenges. In this research, a ternary composite of MnO2/polyaniline (PANI)/Maxsorb was studied. The combination of Maxsorb, PANI, and MnO₂ is a unique feature of this research, with Maxsorb acting as a porous structural framework; PANI enhancing electrical conductivity; and MnO₂ providing high pseudocapacitance. The ternary material was prepared by impregnation of MnO2 and PANI into the pores of Maxsorb carbon in a two-sequence procedure, i.e., (i) incipient wetness impregnation of Mn(NO3)2 into porous carbon followed by calcination to obtain MnO2/Maxsorb, and (ii) in situ polymerization of aniline monomer in the MnO2/Maxsorb, hence obtaining the final ternary nanocomposite of MnO2/PANI/Maxsorb. The electrochemical test using H2SO4 electrolyte (1 M) revealed that the ternary material outperformed single porous carbon or PANI as well as their binary nanocomposite in terms of properties such as energy density, power density, and capacitance. The ternary material had a specific surface area of around 2,078 m2 g-1, containing microporous and mesoporous structures. The material featured a specific capacitance up to 500 F g-1 and a power density of 37.6 kW kg-1 as well as an energy density of 62.69 Wh kg-1.
Co-Authors AA Sudharmawan, AA Agus Prasetya Akmal, Afiffurroyan Aflah Amelia, Shinta Anggun Rahmada Arief Budiarto Arih Diyaning Intiasari Budi Aji, Budi Budi Satria Panandita Cahyono, Rochim Bakti Chandra Wahyu Purnomo Evila Purwanti Sri Rahayu, Theresia Fahrurrozi, Moh. Fajar Marendra Fera Wahyuningsih Gala, Kyla Amalia Hardaning Pranamuda Hardhianti, Meiga Putri Wahyu Henra Gurning Hery Widijanto Imam Prasetyo Imam Prasetyo Irsal, Muh. Masruroh, Kuni Mayang Rachma Aninstya Moh. Fahrurrozi Nur'aini, Aprilianti Nurbaedah, Nurbaedah Pani Satwikanitya Pradana, Nova Yoga Prasetyo, Imam Putri, Nur Rofiqoh Eviana Risnawati, Dhea Atika Rochmadi Rochmadi Saputra, Daffa Dewa Satwikanitya, Pani Sri Widiyati Sudarto Sudarto Tandio, Sugianto Wahyudi Budi Sediawan Wahyudi Budi Sediawan Yuni Kusumastuti, Yuni Zahrul Mufrodi, Zahrul