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All Journal POSITRON Jurnal Fisika Unand Jurnal Pengabdian UntukMu NegeRI JOIV : International Journal on Informatics Visualization Emerging Science Journal Journal of Physics: Theories and Applications Jurnal Penelitian Pendidikan IPA (JPPIPA) Communications in Science and Technology Jurnal Hilirisasi IPTEKS (JHI) Jurnal Ilmu Fisika MONSU'ANI TANO Jurnal Pengabdian Masyarakat BERNAS: Jurnal Pengabdian Kepada Masyarakat Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Indonesian Journal of Community Empowerment and Service
Muldarisnur, Mulda
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Andalas University
Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Veterinary Other

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Sintesis Dan Karakterisasi Karbon Aktif Doping TiO2 Untuk Menurunkan Kadar Asam Lemak Bebas Pada Minyak Jelantah Rahman, Cen; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 13 No 1 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.1.42-48.2024

Abstract

Research has been conducted on reducing the levels of free fatty acids in used cooking oil using activated carbon derived from teak sawdust doped with TiO2. The used cooking oil employed in this study underwent five frying cycles. The activated carbon was derived from teak sawdust and activated using a 10% ZnCl2 solution. The activated carbon was tested for moisture and ash content. The activated carbon was doped with TiO2 in various mass ratios, specifically 3:100, 6:100, 9:100, and 12:100, using solid-state synthesis at a temperature of 500 °C. The doped carbon was subjected to XRD analysis. The purified used cooking oil was tested for free fatty acid levels and clarity using UV-vis spectroscopy. The moisture content of the activated carbon was found to be 3.60%, while the ash content was 1.95%. XRD analysis revealed that the crystal size of the activated carbon was 38.9 nm, which decreased to 27.2 nm after TiO2 doping. Free fatty acid levels decreased from 1.18% to 0.29% in the free fatty acid content test. In the UV-vis measurement, the absorbance value for used cooking oil was higher at 4.5734, while purified oil had an absorbance value of 4.1985. The research results indicated that the best mass ratio of activated carbon to TiO2 was 9:100. The use of TiO2 doped activated carbon as an adsorbent effectively reduced the levels of free fatty acids in used cooking oil.
Peningkatan Aktivitas Fotokatalis Nanopartikel Seng Oksida Didoping Aluminium Untuk Mereduksi Merkuri Ramadhani, Andini; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 13 No 2 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.2.197-203.2024

Abstract

Merkuri (Hg) merupakan salah satu limbah logam berat yang banyak ditemukan di lingkungan perairan. Upaya penanganan diperlukan untuk menurunkan kadar pencemaran merkuri ini. Pada penelitian ini digunakan fotokatalis nanopartikel ZnO didoping Al untuk mereduksi merkuri. Nanopartikel ZnO didoping dengan variasi % mol Al 0%, 3%, 5% dan 7% menggunakan metode sol-gel. Nanopartikel ZnO/Al dikarakterisasi menggunakan X-Ray Diffraction (XRD), Particle Size Analyzer (PSA), dan spektrofotometer UV-Vis. Berdasarkan hasil karakterisasi menggunakan XRD dan PSA, diperoleh ukuran kristal ZnO doping Al 0%, 3%, 5%, dan 7% berturut-turut sebesar 25,15 nm, 36,28 nm, 36,29 nm, 40,85 nm, dengan ukuran partikel 27,6 nm, 36,9 nm, 42,8 nm, 67,5 nm. Hasil uji spektrofotometer UV-Vis didapatkan band gap energy masing-masing sampel sebesar 3,22 eV, 3,13 eV, 3,1 eV, dan 3,02 eV. Aktivitas fotokatalisis nanopartikel diuji untuk mereduksi logam merkuri dengan variasi konsentrasi merkuri 0,5 mg/L, 1 mg/L, 1,5 mg/L dan 2 mg/L. Persen reduksi paling besar untuk setiap variasi larutan merkuri ditunjukkan oleh fotokatalis ZnO/Al 7%, dimana mampu mereduksi merkuri 0,5 mg/L, 1 mg/L, 1,5 mg/L dan 2 mg/L sebesar 94,12%, 93,68%, 93,18%, 92,76%.
Studi Pengaruh Ketebalan Elektroda Karbon Aktif dari Kulit Buah Kakao terhadap Kinerja Elektrokimia Superkapasitor Dunnas, Irsya; Nasution, Widi Mulia; Muldarisnur, Mulda; Yetri, Yuli
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.594-601.2024

Abstract

Sintesis karbon aktif dari kulit kakao dengan variasi ketebalan elektroda 0,4; 0,5; dan 0,6 mm bertujuan untuk melihat pengaruhnya terhadap kinerja superkapasitor. Tebal elektroda yang berbeda diberi kode sampel yaitu tebal 0,4 mm dengan kode CC-0,4; tebal 0,5 dengan kode CC-0,5 mm dan tebal 0,6 mm dengan kode CC-0,6. Pembuatan elektroda karbon dari kulit kakao dilakukan dalam beberapa tahap yaitu pengeringan organik, prakarbonasi, aktivasi kimia menggunakan aktivator KOH 0,4 M dan pencetakan pelet menggunakan press hidrolik dengan tekanan 8 ton. Pelet yang telah dicetak dikarbonasi menggunakan gas N2 pada suhu 600 ⁰C dan aktivasi fisika menggunakan gas CO2 pada suhu 700 °C. Sifat elektrokimia dari sel superkapasitor ditinjau melalui sistem dua elektroda dalam elektrolit 1 M KOH. elektroda karbon aktif optimum yang diperoleh pada sampel CC-0,5 dengan kapasitansi spesifik yang tinggi  mencapai 366,67 F/g pada rapat arus 1,0 A/g. Rapat energi maksimum yang didapatkan sebesar 660 Wh/Kg pada rapat daya optimum 2378,39 W/Kg. Potensi kulit kakao sebagai sumber karbon aktif dengan ketebalan 0,5 mm menunjukan kinerja perangkat penyimpanan energi elektrokimia superkapasitor yang tinggi dan stabil dengan ketahanan bahan yang baik.
Pengaruh Ukuran Dimer Nanopartikel Bola Emas, Perak, dan Aluminium yang Ditambahkan pada Lapisan Back Surface terhadap Efisiensi Sel Surya CIGS Syaibah, Abi; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.843-849.2024

Abstract

This research aims to determine the effect of the size and material of spherical nanoparticle dimers placed on the back surface layer of CIGS solar cells on the resulting current density. This research was conducted computationally using the finite difference time domain (FDTD) method. Three materials were studied: silver, gold, and aluminium. For each material, nanoparticle diameter was varied. The calculation results show that the short circuit current density (Jsc) increases with the nanoparticle diameter. Silver nanoparticle dimers showed the highest increase in Jsc. A sphere diameter of 60 nm produces the highest Jsc. The increase in the Jsc of CIGS solar cells is due to the back reflection of light into the active layer of solar cells by nanoparticles and the near field excitation around nanoparticle dimers. The significant increase in Jsc shows the potential for utilizing silver nanoparticle dimers to increase the efficiency of CIGS solar cells.
Applications of Fiber Optic Sensor for Monitoring and Early Warning of Soil Shift on IoT based System Herlin, Helmi Septaria; Harmadi, -; Febrielviyanti, -; Muldarisnur, -
JOIV : International Journal on Informatics Visualization Vol 4, No 3 (2020)
Publisher : Society of Visual Informatics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62527/joiv.4.3.219

Abstract

A fiber optic sensor system has been designed to monitor ground shift using a multimode FD-620-10 step index fiber optic cable equipped with an IoT-based data transmission system. The sensor system consists of a light source in the form of a diode laser, a fiber optic cable light wave guide, and an OPT101 photodetector. Data processing is done using the Arduino Uno R3 microcontroller and data transmission to the server using the Arduino Ethernet Shield. Localhost is a webserver that displays measurement data and sends e-mail early warning notification of ground shift hazards. Optical fiber is used to measure the value of ground displacement by utilizing changes in output voltage. The change in output voltage occurs due to variations in the change in the diameter of the optical fiber arch. The results of sensor testing obtained an average measurement error of 1.53%.
Penerapan Sistem Monitoring Suhu dan Kelembaban Ruangan Berbasis IoT untuk Optimalisasi Pengujian Di Laboratorium Riset UPT Laboratorium Sentral Universitas Andalas Apriani, Akmecia Risqa; Margani, Taufik Try; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.41-48.2026

Abstract

The quality of laboratory test results is strongly influenced by temperature and humidity conditions, therefore monitoring these parameters is essential to ensure compliance with ISO/IEC 17025:2017 standards. This study aims to develop an Internet of Things (IoT)-based temperature and humidity monitoring system accessible via the Adafruit IO platform. The system is designed using a DHT22 sensor for temperature and humidity detection, with data processing carried out by the ESP32 microcontroller, which transmits the information in realtime to Adafruit IO. The experimental results indicate that the system performs reliably in recording laboratory room conditions, with an average measurement error of 1.873% for temperature and 3.743% for humidity, while the overall accuracy reached 98,127% for temperature and 96,257% for humidity. furthermore, the ESP32 successfully transmitted data to the Adafruit IO dashboard and activated the LED and buzzer as warning indicators when the measured values exceeded the predefined thresholds.
Peningkatan Absorpsi Cahaya pada Nanostruktur TiO₂ Terdoping Cu dan Ni untuk Aplikasi Pemisahan Air Fotokatalitik Novianti, Noni; Ramona, Fransischa; Wellia, Diana Vanda; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.635-643.2025

Abstract

This study reports the enhancement of light absorption by TiO₂ nanoparticles when doped with Ni and Cu nanoparticles. Numerical simulations were performed using the boundary element method. The absorbance in the visible region of Ni-doped TiO₂ increases compared to pure TiO₂. The increase in absorbance is accompanied by a shift in the absorption band edge to a longer wavelength (redshift) due to the formation of new energy levels that narrow the band gap. Cu-doped TiO₂ exhibits a more significant increase in absorbance and a wider absorption range. Both dopants decrease the band gap relative to pure TiO₂, with Cu doping producing a greater decrease. Ni and Cu doping enhance the optical response of TiO₂ in the visible region. Cu doping has the most dominant effect in broadening the absorption and lowering the band gap energy. These findings indicate that Ni- and Cu-based dopant engineering is a potential approach to improve the performance of TiO₂-based materials in photocatalytic applications such as hydrogen production by water splitting.
Optimalisasi Potensi Limbah Alat Gelas sebagai Adsorben Limbah Logam Berat Fe, Cd, Pb dan Mn Skala Laboratorium Gusthia, Melisa Weno; Nurmi, Fatiyah Aghni Yati; Rahmatunisa, Sefina; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 15 No 2 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.2.125-131.2026

Abstract

Chemical laboratory activities produce liquid waste containing hazardous materials, including heavy metals such as Fe, Cd, Pb, and Mn, which have the potential to pollute the environment if not managed properly. This study aims to optimize the use of laboratory glassware waste as an environmentally friendly alternative adsorbent to reduce heavy metal levels in laboratory-scale liquid waste. The research stages include collecting glassware waste from various laboratories, grinding, sieving, and activating the adsorbent through chemical treatment (HNO₃ and HCl-HNO₃), drying, calcination, and adding NaOH to open the adsorbent pores. Material characterization was carried out using SEM, FTIR, and BET to observe the morphology and surface area of the pores. Initial results showed that the three-stage activation was able to improve the quality of the adsorbent pores so that it was ready for use in the adsorption process. In the next stage, heavy metal adsorption tests were carried out with variations in time and mass of the adsorbent, then analyzed using Flame AAS and re-characterized with SEM-EDX, FTIR, and BET. The results using FTIR can be proven that the adsorbent contains SiO2 compounds that have the potential to have pores due to the structure of the compound. The results of the BET characterization obtained a surface area value of 0, which proves that the adsorbent has a very small pore size, also called micropores. The results of Flame AAS measurements show that the adsorbent is able to adsorb heavy metals with an adsorption percentage above 85%.
Co-Authors Abi Syaibah Adine Melossa Famia Adrial, Rico Afdal Afdal Afdal Afdal Afdhal Muttaqin Afrineldi, Rendi Afza, Vikra Yudha Yolanda Ahmad Fauzi Pohan Akrajas Ali Umar Aldilla, Muhammad Syaugi Alimin Mahyudin Amrullah, Yasir Anak Agung Istri Sri Wiadnyani Andini Ramadhani Anggini, Aulia Anla, Anla Fet Hardi Apriani, Akmecia Risqa Ardhiati, Fitria Ardian Putra Astuti Astuti - Astuti Astuti Aulia Anggini Betta Centaury Cecep Irwanda Cen Rahman Dahyunir Dahlan Dahyunir, Dahyunir Damayanti, Elok Dedi Mardiansyah Dian Fitriyani Dian Milvita Disti Nabila Suci Dunnas, Irsya Dwi Pujiastuti Dwi Puryanti Ebriyen Zeni Eldiani Arifya Elistia Liza Namigo, Elistia Elvaswer Elvaswer Exaudi Pratama Rajagukguk Exaudi Pratama Rajagukguk F Marlow Fadilla Monica Fahendri Fahendri Fahendri, F. Famia, Adine Melossa Fani Anjelina Faula Rahmi Febrielviyanti, - Feriska Handayani Irka, Feriska Handayani Fitria Ardhiati Geby Sri Ayu Oktavia Gusthia, Melisa Weno Haiqal, Helmi Harmadi Harmadi Harmadi Harmadi Harmadi, - Helmi Haiqal Helmi Septaria Herlin Ilham Perdana Ilham Perdana Ilham Perdana AT Imam Taufiq Imam Taufiq Irsya Dunnas Irwanda, Cecep Kurniawan, Rengga Adit Lubis, Muhammad Siddiq Ilyas M. Ali Shafii Mahardhika, Muhammad Khaishar Margani, Taufik Try Marzuki Marzuki Marzuki Marzuki Maulidan, Ikhwan Fikri Meqorry Yusfi Mieke Wulandari Mora Mora Muftahul Rizka Muhammad Khaishar Mahardhika Muhammad Siddiq Ilyas Lubis Muhammad Syaugi Aldilla Mutya Vonnisa Nasution, Widi Mulia Nini Firmawati Nola Fridayanti Nola Fridayanti Nola Fridayanti, Nola Novia Dwi Agusri Novianti, Noni Novirza, Resti Nurmi, Fatiyah Aghni Yati Nurul Annisa Perdana AT, Ilham Rahma Fikri Nuradi Rahmad Rasyid Rahman, Cen Rahmatunisa, Sefina Rahmawati Yusri Rahmi Suryani Rahmi, Faula Rajagukguk, Exaudi Pratama Ramacos Fardela Ramadhani, Andini Ramona, Fransischa Rani Delvihardini Rendi Afrineldi Rengga Adit Kurniawan Resti Novirza Ridwan, Jaenudin Rifa Lihayati Rizchi Aulia Utami Rizka, Muftahul Sadikin, Siti Naqiyah Salamah, Ummi Salim Muhaimin Septriani, Yulni Solly Aryza Sri Handani Sri Oktamuliani SRI RAHAYU Sri Rahayu Suci, Disti Nabila Sucy Lestari Wirma Suryani, Rahmi Syaibah, Abi Syukri - Syukri Syukri Trengginas Eka Putra Sutantyo Ummi Salamah Usna, Sri Rahayu Alfitri Utami, Rizchi Aulia Vikra Yudha Yolanda Afza Wellia, Diana Vanda Widi Mulia Nasution Widi Mulia Nasution Wildian Wildian Wulandari, Mieke Yoci Darwita Putri Yuli Yetri Yuli Yetri Yulia Eka Putri, Yulia Eka Yulni Septriani Yusri, Rahmawati Zeni, Ebriyen Zulfi Zulfi Abdullah Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi