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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Fisika Unand JKPK (Jurnal Kimia dan Pendidikan Kimia) Lontar Physics Today
Elvinda Bendra Agustina
Physics, Faculty Of Science And Technology, Institute Of Technology And Science Nahdlatul Ulama Pekalongan Jl. Karangdowo No.9, Pekalongan, Central Java, 51173, Indonesia
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Microstructure and Optical Properties Study of Nd-doped BiFeO3 (Ba1-xNdxFeO3) Films on Quartz Substrate Yofentina Iriani; Dianisa Khoirum Sandi; Rainisa Nurmawanti; Sri Budiawanti; Elvinda Bendra Agustina
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 11 No. 2 (2021)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v11n2.p148-157

Abstract

Bismuth ferrite oxide (BFO), due to its remarkable properties, has become one of the most attractive multiferroic materials to be extensively studied. BFO doped with various materials, including Neodymium (Nd), could improve its properties applicable to numerous electronic devices. However, the study related to the properties of Nd-doped BFO (Ba1-xNdxFeO3) thin films on a quartz substrate, especially the optical properties, is rather scarce. This study aimed to investigate the microstructure and optical properties of the Nd-doped BFO (BNFO) as the variation of the Nd concentrations. Here, the BNFO thin films with Nd concentrations of 0.05 (BNFO5); 0.1 (BNFO10); and 0.2 (BNFO20) have been deposited on the quartz substrates via the sol-gel method done by a spin coater. The films were annealed at 600oC for 1.5 h. The XRD result of the BNFO films revealed a single phase of BFO with a cubic structure. The lattice constants and volume cells of the films declined with more Nd. Meanwhile, the crystallite size and lattice strain changed due to the change in the Nd number. Additionally, the morphology images showed the pores on the films’ surface and the different film thicknesses of each BNFO film. From the optical characterization, the transmittance spectra of the BNFO films tended to rise as the more Nd amount doped, in which the BNFO20 had the highest transmittance. The BNFO10 had the highest refractive index, followed by the BNFO5 and BNFO20. Contrarily, the BNFO20 had the highest extinction coefficient and  spectra, followed by the BNFO5 and BNFO10. Further, the bandgap values of the BNFO5, BNFO10, and BNFO20 were 2.75, 2.85, and 2.64, respectively. Accordingly, due to the highest Nd amount that most impacted its microstructure, the BNFO20 exhibited the lowest bandgap value compared to the other films that are good for photovoltaic application.
Study of BOD, COD and TSS Removal in Batik Industry Wastewater using Electrocoagulation Method Elvinda Bendra Agustina; Abdul Hakim Prima Yuniarto
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 7, No 2 (2022): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v7i2.59977

Abstract

Central Java, especially Pekalongan, is one of the largest batik centres with a high amount of batik waste and has the potential to pollute the environment. Wastewater treatment using the electrocoagulation method as an alternative to environmental pollution prevention in Pekalongan Regency. This study determined the effect of stress and resistance time on decreasing COD, BOD and TSS levels in batik wastewater. The analysis performed on the samples included BOD (Biological Oxygen Demand), COD (Chemical Oxygen Demand), TSS (total suspended solids), and pH. Voltage variations of 12, 24, and 30 volts and holding times of 90, 120, 150, and 180 minutes were applied. A pair of aluminium metals (Al-Al) was used with a thickness of 0.1 cm, an area of 12x14 cm, and a volume of 2500 ml. The results showed that the voltage and contact time decreased the amount of COD, BOD and TSS. In addition, the results showed that the electrocoagulation method at a voltage of 30 volts and a contact time of 180 minutes could reduce COD levels by 75.78%, TSS levels by 93.9%, and BOD levels by 83.75%.
Pengaruh Jarak Elektroda dan Waktu Terhadap Kandungan COD dan TSS Menggunakan Metode Filtrasi-Elektrokoagulasi pada Pengolahan Limbah Batik Elvinda Bendra Agustina; Abdul Hakim Prima Yuniarto; Dian Arif Rachman; Alif Tiana Dewi
Lontar Physics Today Vol 1, No 1 (2022): Februari 2022
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v1i1.10669

Abstract

Produksi batik menghasilkan limbah cair yang memiliki dampak negatif terhadap lingkungan karena bahan kimia hasil pengolahan.  Metode filtrasi-elektrokoagulasi dirasa efektif untuk menurunkan kandungan COD dan TSS pada limbah cair batik sehingga layak buang. Telah dilakukan pengolahan limbah batik menggunakan metode filtrasi-elektrokoagulasi dengan variasi jarak elektroda (2, 4, dan 6) cm dan waktu kontak (60, 90, 120 dan 150) menit. Digunakan elektroda alumunium (Al-Al) dengan ketebalan 0,1 cm dan volume limbah 2500 ml. Hasil penelitian menunjukkan efisiensi penurunan COD dan TSS tertinggi pada variasi jarak 2 cm dengan waktu kontak 150 menit. Efisiensi penurunan COD sebesar 95% sedangkan efisiensi penurunan TSS sebesar 94%. Hasil tersebut menunjukkan bahwa semakin dekat jarak antar elektroda dan semakin lama waktu kontak maka semakin tinggi penurunan kandungan COD dan TSS.Keywords: Filtrasi-elektrokoagulasi, Limbah batik, COD, TSS
Desain Sistem Smart Feeder Ayam Berbasis Internet of Things (IoT) Guna Mencegah Keterlambatan Pemberian Pakan Elvinda Bendra Agustina; Dian Arif Rachman; Recha Nofillah; Lia Ikhlasia Fitri
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.13.2.297-302.2024

Abstract

Pemberian pakan ayam secara manual menjadikan pemberian pakan ayam kurang efektif dan efisien. Pengembangan sistem pemberi pakan ayam cerdas berbasis Internet ofThings (IoT) telah dilakukan. Penelitian ini bertujuan untuk mengembangkan desain sistem smart feeder ayam berbasis IoT guna mencegah keterlambatan pemberian pakan. Memungkinkan alat bekerja dengan melakukan kontrol feeder berdasarkan pengaturan waktu, monitoring hopper secara otomatis yang diintegrasikan dengan IoT. Setiap device dihubungkan dengan internet sehingga dapat dipantau dari jarak jauh. Metode yang digunakan adalah perancangan dan telah dilakukan uji dan pengambilan data. Hasil uji aplikasi Blynk menunjukkan ketepatan pengaturan yang telah diberikan dengan kondisi real. Fungsi sistem alat sudah sesuai dengan desain sistem yang direncanakan. Rata-rata persentase error yang terjadi 14% secara keseluruhan tetapi mengecil sampai rata-rata 3% pada berat pakan diatas 5 kg dikarenakan semakin besar volume hopper maka jarak antara sensor ke pakan semakin dekat sehingga nilai error semakin rendah. Pengujian NTP menunjukkan nilai akurasi dan kepresisian 100%. Uji kecepatan rotasi menunjukkan rata-rata kecepatan rotasi hopper yaitu 445,4 rpm sehingga hopper berotasi sesuai dengan perkiraan. Uji volume distribusi pakan sudah sesuai karna pakan 1 diletakkan paling dekat dengan hopper sehingga volume pakan akan terisi paling banyak di bandingkan dengan tempat pakan lainnya
Co-Authors Abdul Hakim Prima Yuniarto Alif Tiana Dewi Dian Arif Rachman Dianisa Khoirum Sandi Lia Ikhlasia Fitri Rainisa Nurmawanti Recha Nofillah Sri Budiawanti Yofentina Iriani