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All Journal Journal of English Language and Education Jurnal Teknologi Kimia Unimal Jurnal Teknik Kimia dan Lingkungan Journal Serambi Engineering (JSE)
Reza, Mutia
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Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Other

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SIMULASI ALIRAN FLUIDA PADA PROSES PENYERAPAN CO2 DENGAN ADSORBENT BATU APUNG METODE CFD Reza, Mutia; Saputra Ramadhan, Muhammad Bagus; Sylvia, Novi; Yunardi, Yunardi
Jurnal Teknologi Kimia Unimal Vol. 13 No. 2 (2024): Jurnal Teknologi Kimia Unimal - Nopember 2024
Publisher : Chemical Engineering Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jtku.v13i2.19556

Abstract

Emisi gas alam yang dihasilkan industri minyak dan gas, menyebabkan pemanasan global. CO2 yang terkandung dalam reservoir gas alam dapat menurunkan kualitas gas dan menyebabkan masalah teknis, seperti korosi dan penyumbatan pada pipa. Proses adsorpsi menggunakan batu apung sebagai adsorben dipelajari untuk mengoptimalkan penyerapan CO2 dengan metode CFD. Penelitian ini mengeksplorasi pengaruh laju alir terhadap tinggi kolom adsorpsi menggunakan computational fluid dynamics (CFD) dengan perangkat lunak Ansys 2022 R1. Studi dimodelkan seperti kolom adsorpsi sederhana berbentuk silinder dengan isian packing batu apung sebagai adsorben. Tujuan dari penelitian ini untuk mengetahui persen penyerapan terhadap variasi tinggi unggun yaitu 10 cm, 12 cm, 14 cm. Hasil menunjukkan bahwa pada tinggi unggun 14 cm menunjukkan persen penyerapan tertinggi disebabkan karena kontak antar CO2 dengan adsorben lebih lama sehingga luas permukaan lebih besar pada temperatur yang sama.
Analysis of KCl and H2SO4 Electrolyte Concentration Variations on Specific Capacitance of Electrodes (CNT/PVA) Through Cyclic Voltammetry (CV) Reza, Mutia; Lusi Ernawati; Asful Hariyadi; Ranti Kusuma Wardhani; Thalia Winda Sari; Novi Sylvia
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Escalating need for power usage is the author’s concern in producing this research. Supercapacitors are one of the energy storage devices that have better performance than conventional capacitors. Supercapacitor components generally consist of electrodes, electrolytes, and separators. Electrolytes have an important role that can affect the specific capacitance of supercapacitors. This research resulted in analyzing the type and variation of electrolyte concentrations in the form of KCl and H2SO4 at concentrations of 0.4; 0.7 and 1 M, respectively. Cyclic voltammetry (CV) was conducted using carbon nanotube electrodes which were molded into sheets using Polyvinyl Alcohol (PVA) binder. CV analysis aims to determine the supercapacitor performance as measured by the specific capacitance value. Based on the observation of the results obtained, the best specific capacitance in each type of electrolyte KCl and H2SO4 at a concentration of 1 molar is 55.561 and 54.981 F/g, respectively.
Adsorption Kinetics and Process Parameter Effects on Oil Uptake by Tamarind Fruit-Shell Activated Carbon Ernawati, Lusi; Anifah, Eka Masrifatus; Musyarofah, Musyarofah; Reza, Mutia; Waluyo, Joko; Sapawe, Norzahir
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7596

Abstract

Oil contamination presents a major challenge to wastewater treatment systems due to its detrimental effects. This research explores the effectiveness of activated carbon derived from tamarind fruit shells as an adsorbent for removing oil from wastewater. The activated carbon was prepared using three different chemical agents: phosphoric acid, zinc chloride, and sodium hydroxide. Characterization of the resulting carbon materials was performed using XRD, FTIR, SEM, and BET analysis. Batch adsorption experiments were conducted to evaluate the influence of initial oil concentration, adsorbent dosage, contact time, temperature, and pH. The BET specific surface area, pore size and total pore volume for the optimum adsorption capacity of activated carbon using H3PO4 are obtained at 617.59 m2.g-1, 37.14 cm3.g-1 and 0.812 g.g-1, respectively. Optimal adsorption occurred at an oil concentration of 5000 mg.L-1, a dosage of 1 g.L-1, a contact time of 60 minutes, a temperature of 60°C, and neutral pH (7). Across all activating agents, the Langmuir isotherm best described the adsorption equilibrium, while adsorption kinetics followed the pseudo-second-order model. Among the samples, activated carbon treated with H3PO4 demonstrated the highest adsorption capacity (1070 mg.g-1), followed by ZnCl2 (879 mg.g-1), and NaOH (643 mg.g-1). These results indicate that tamarind shell-derived activated carbon is a cost-effective and efficient solution for oil removal in wastewater treatment applications.
Willingness to Communicate and English Speaking Performance: A Phenomenological Study of Tadulako University EFL Students Reza, Mutia; Hastini, Hastini; Sadilia, Sukmawati; Marhum, Mochtar
Journal of English Language and Education Vol 10, No 6 (2025)
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jele.v10i6.1843

Abstract

Willingness to communicate (WTC) has emerged as a critical psychological construct mediating between linguistic competence and actual language use, yet its influence on speaking performance remains underexplored in Indonesian EFL contexts through learners' lived experiences. This qualitative study employs Interpretative Phenomenological Analysis (IPA) to investigate how English Education students at Universitas Tadulako experience and interpret the ways WTC shapes their English-speaking performance. Three undergraduate students (semesters 3-5) participated in in-depth semi-structured interviews, with findings triangulated through a lecturer interview. Systematic IPA analysis revealed four superordinate themes: (1) WTC as Dynamic Social-Cognitive State, fluctuating with context rather than functioning as a stable trait; (2) The Fluency-Accuracy Paradox, whereby students universally prioritize comprehensibility over grammatical correctness as a strategic coping mechanism; (3) Fear as Cultural-Pedagogical Construct, wherein judgment anxiety rooted in Indonesian educational culture inhibits WTC despite supportive teaching; and (4) The Preparation Imperative, in which advance notice and cognitive readiness universally facilitate WTC while spontaneous demands trigger defensiveness. Findings demonstrate that WTC operates as a multi-dimensional construct shaped by individual motivation, social ecology, cultural context, and pedagogical environment. Practical implications include creating psychologically safe environments, validating fluency-first strategies, and scaffolding spontaneity through preparation.
Co-Authors Anifah, Eka Masrifatus Fachry Abda El Rahman Hariyadi, Asful Hastini, Hastini Joko Waluyo Mochtar Marhum Musyarofah Musyarofah, Musyarofah Novi Sylvia Ranti Kusuma Wardhani Sadilia, Sukmawati Sapawe, Norzahir Saputra Ramadhan, Muhammad Bagus Sembiring, Rinawati Thalia Winda Sari yunardi, yunardi