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All Journal CHEESA: Chemical Engineering Research Articles Jurnal Bio-Geo Material Dan Energi Journal Peqguruang: Conference Series Research In Chemical Engineering Jurnal Bakti Nusantara
Devi Lestari
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Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Public Health Social Sciences Other

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Pengaruh Ekstraksi SiO2 dari Lumpur Lapindo Terhadap Daya Adsorpsinya pada Larutan Metil Orange Ulfindrayani, Ika Fitri; Ikhlas, Nurani; A'yuni, Qurrota; Fanani, Nurull; Gaol, Binaria Lumban; Lestari, Devi
CHEESA: Chemical Engineering Research Articles Vol. 2 No. 2 (2019)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (340.736 KB) | DOI: 10.25273/cheesa.v2i2.5108

Abstract

Metil orange merupakan salah satu zat warna yang banyak digunakan di industri tekstil. Metil orange ini tergolong ke dalam zat warna yang berbahaya bagi lingkungan. Salah satu metode yang baik digunakan untuk mengurangi bahaya dari metil orange yaitu metode adsorpsi. SiO2 diketahui memiliki sifat adsorben yang baik karena memiliki struktur dan sifat permukaan yang stabil terhadap bahan kimia. Lumpur Lapindo merupakan salah satu sumber SiO2 yang keberadanya melimpah. Kandungan SiO2 pada Lumpur Lapindo yakni sebesar 55%. Tingginya kandungan SiO2 dalam Lumpur Lapindo, membuat lumpur lapindo memiliki daya adsorpsi yang baik. Pada penelitian ini Lumpur Lapindo digunakan sebagai adsorben untuk metil orange. Proses adsorpsi dilakukan dengan metode batch. Lumpur Lapindo dipreparasi terlebih dahulu untuk mengetahui pengaruhnya terhadap daya adsorpsi pada Metil orange. Preparasi dilakukan dengan ekstraksi SiO2 dari Lumpur Lapindo menggunakan metode kopresipitasi yang dapat meningkatkan kemurnian SiO2 dari 50% menjadi 78,6%. SiO2 hasil ekstraksi memiliki %removal dan kapasitas adsorpsi yang lebih tinggi dibandingkan dengan lumpur Lapindo masing-masing sebesar 81,39% dan 0,081mg/g.
Edukasi Dampak Negatif Penggunaan Vape bagi Remaja di Desa Banyumas Stabat, Langkat, Sumatera Utara Miswanda, Dikki; Lestari, Devi; Masriah, Imas; Sebayang, Alexander
Jurnal Bakti Nusantara Vol. 2 No. 3 (2025): Jurnal Bakti Nusantara
Publisher : Pustaka Media Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63763/jbn.v2i3.90

Abstract

Penggunaan rokok elektrik atau vape semakin meningkat di kalangan remaja di Indonesia termasuk di wilayah pedesaan. Kurangnya pemahaman masyarakat mengenai bahaya vape menjadi tantangan serius dalam upaya pencegahan dampak kesehatan yang panjang. Kegiatan pengabdian masyarakat ini bertujuan untuk mengidentifikasi tingkat pemahaman masyarakat Desa Banyumas, Kecamatan Stabat, terhadap bahaya penggunaan vape bagi kesehatan. Edukasi dilakukan melalui pendekatan partisipatif yang melibatkan peserta secara aktif dalam ceramah dan diskusi interaktif. Hasil kegiatan menunukkan adanya peningkatan pengetahuan peserta sebesar rata-rata 49,8% yang diukur melalui pre-test dan post-test. Selain itu, perubahan sikap positif juga teridentifikasi, dengan 85% remaja menyatakan komitmen untuk menghindari penggunaan vape. Pendekatan partisipatif dan kontekstual terbukti efektif dalam meningkatkan kesadaran risiko kesehatan di tingkat desa. Temuan ini menegaskan pentingnya strategi edukasi berbasis komunitas dalam upaya pencegahan penggunaan vape di lingkungan masyarakat.
A Review on Valorization of Coal Fly Ash into High-Purity Silica: Extraction Methods, Applications, and Future Perspectives Devi Lestari; Imas Masriah
Research in Chemical Engineering Vol. 5 No. 1 (2026): Research in Chemical Engineering
Publisher : Universitas Muhammadiyah Purwokerto

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Abstract

Coal fly ash (CFA), a by-product of coal combustion, contains high silica (SiO₂) content and is continuously generated, making it a promising secondary source of silica. Efficient extraction of silica from CFA can support sustainable material utilization, reduce industrial waste, and align with circular economy principles. This review analyzes recent advances in CFA-derived silica, focusing on extraction techniques, structural characteristics, applications, sustainability, and future prospects. Techniques examined include alkaline leaching, acid dissolution, alkali fusion, sol–gel processing, hydrothermal activation, and emerging biological and process-intensified methods such as ultrasonic treatment and ZnO sintering. Key factors such as CFA composition, Si/Al ratio, and amorphous content are discussed for their influence on extraction efficiency. Recovery efficiencies of CFA-derived silica vary from 38% to over 93%, with cascaded processes achieving purities up to 99%. Structural forms range from amorphous nanoparticles to ordered mesoporous frameworks, enabling applications in construction, catalysis, environmental remediation, energy storage, and biomedicine. Life cycle assessments show that CFA valorization significantly reduces CO₂ emissions compared to conventional quartz-based silica production. Limitations include feedstock heterogeneity, reagent consumption, and economic feasibility. CFA-derived silica offers a sustainable route for industrial waste mitigation while providing high-purity silica for advanced applications. Future research should focus on greener hybrid extraction methods, process standardization, and application-driven material design, supported by regulatory and cross-sector collaboration.
STRATEGI PENGEMBANGAN USAHA KERIPIK UBI JALAR UNGU (Ipomoea Batatas L) PADA USAHA MAKMUR SUMARORONG DI DESA RANTE KAMASE KECAMATAN SUMARORONG KABUPATEN MAMASA Andi Baso; Haeruddin Haeruddin; Devi Lestari
Journal Peqguruang: Conference Series Vol 4, No 2 (2022): Peqguruang, Volume 4, No.2, November 2022
Publisher : Universitas Al Asyariah Mandar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35329/jp.v4i2.1246

Abstract

Penelitian ini dilaksanakan selama 3 bulan yakni pada bulan Februari 2020 sampai dengan Mei 2020 di Desa Rante Kamase Kecamatan Sumarorong Kabupaten Mamasa. Penelitian ini bertujuan untuk mengetahui faktor Internal dan faktor Eksternal strategi Pengembangan Usaha Keripik Ubi Jalar Ungu dengan studi kasus pada “Usaha Makmur Sumarorong” di Desa Rante Kamase. Metode yang digunakan dalam penelitian ini yaitu populasi dengan asumsi bahwa Usaha Makmur Sumarorong ini telah memenuhi kriteria karakter penelitian. Untuk menganalisis strategi pengembangan menunjukkan bahwa strategi pengembangan usaha keripik ubi jalar ungu pada Usaha Makmur Sumarorong yaitu faktor kekuatan dengan nilai total 1,91 lebih besar dibandingkan faktor kelemahan dengan nilai total yaitu 0,96 hal ini menunjukkan bahwa kekuatan dapat mendukung pengembangan usaha Keripik Ubi Jalar Ungu Pada Usaha Makmur Sumarorong. Sedangkan faktor eksternal memiliki faktor peluang dengan nilai total yaitu 1,50 lebih besar dari faktor ancaman dengan nilai total yaitu 1,15 hal ini menunjukkan bahwa usaha keripik ubi jalar ungu pada usaha Makmur Sumarorong ini memiliki potensi peluang yang sangat besar. Posisi Strategi usaha keripik ubi jalar ungu pada usaha Makmur Sumarorong di Desa Rante Kamasemenggunakan strategi SO (Strength-Opportunity) dimana menggunakan seluruh kekuatan untuk memanfaatkan peluang. Kata kunci : ubi jalar ungu, pengembangan, strategi, analisisSWOT.
FTIR Analysis of ZnO-Functionalized Activated Carbon Derived from Oil Palm Empty Fruit Bunches for Potential Photocatalytic Applications Lestari, Devi; Masriah, Imas; Hasibuan, Adelia Yesya Putri; Pratiwi, Pina Budiarti
Jurnal Bio-Geo Material Dan Energi Vol. 6 No. 1 (2026): Journal of Bio-Geo Material and Energy (BiGME), February 2026
Publisher : PUI BiGME Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/j-bigme.v6i1.49493

Abstract

This study investigates the surface chemical characteristics of ZnO-functionalized activated carbon (AC) derived from oil palm empty fruit bunches (OPEFB) using Fourier Transform Infrared (FTIR) spectroscopy. Activated carbon was prepared through carbonization at 400 °C followed by chemical activation using KOH. ZnO functionalization was performed via the sol–gel method with a nominal ZnO loading of 10 wt% relative to AC. FTIR analysis revealed dominant absorption bands corresponding to O–H stretching (~3430 cm⁻¹), C=O stretching (~1630 cm⁻¹), and C–O vibrations (~1050–1100 cm⁻¹), indicating the presence of oxygen-containing surface functional groups. The appearance of a characteristic Zn–O vibrational band in the 450–600 cm⁻¹ region confirmed the incorporation of ZnO within the composite structure. Minor peak shifts and variations in band intensity observed after ZnO modification suggest changes in the local chemical environment and possible interactions between ZnO nanoparticles and oxygen-containing functional groups. However, FTIR analysis alone does not provide definitive confirmation of specific interfacial bonding configurations. The results indicate that KOH activation preserved reactive oxygenated functionalities that remained stable after ZnO incorporation. The coexistence of porous AC characteristics and ZnO-associated vibrational features suggests that the synthesized AC/ZnO composite possesses surface chemical properties relevant for adsorption-assisted photocatalytic applications. This work demonstrates the potential valorization of OPEFB biomass into functional carbon-based hybrid materials.
Structural and Crystallographic Evolution of Nano-POFA using XRD-Based Crystallite Analysis Masriah, Imas; Lestari, Devi; Sani, Sulwiyatul Kamariyah; Pangestika, Inten; Miswanda, Dikki
Jurnal Bio-Geo Material Dan Energi Vol. 6 No. 2 (2026): Journal of Bio-Geo Material and Energy (BiGME), April 2026
Publisher : PUI BiGME Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/j-bigme.v6i2.49631

Abstract

Palm oil fuel ash (POFA) is one of the main by-products of the palm oil industry, predominantly composed of silica (SiO2) and various other metal oxides. Nano-POFA (P1) was synthesized using a top-down approach via high-energy ball milling process at a rotational speed of 1300 rpm for 1 hour using 4 mm-diameter milling balls. The X-ray diffraction patterns revealed that the dominant crystalline phases were Quartz (SiO2) and Mullite (Al6Si2O13), accompanied by minor phases such as Cristobalite (SiO2), Hematit (Fe2O3), Calcite (CaCO3), CaO, and Al2O3. The XRD analysis results of samples P0 (without ball milling) and P1 (1 hour of ball milling) revealed a significant decrease in peak intensity and peak broadening after 1 hour of the milling process. This phenomenon indicates partial amorphization and crystal fragmentation. The average crystallite size decreased from 92.14 nm in sample P0 to 47.52 nm in sample P1. These results indicate that the high-energy ball milling process induces lattice distortion, structural disorder, and amorphization within the Si-O framework of the POFA. The Williamson-Hall analysis indicated an increase in microstrain from ԑ=3.38 x 10-3 to ԑ=1.227 x 10-2. The structural transformations increase surface defect density and reactivity, signifying nano-POFA’s potential as material heterogenous catalyst for related chemical processes
Co-Authors Alexander Sebayang Andi Baso Dikki Miswanda Gaol, Binaria Lumban Haeruddin Haeruddin Hasibuan, Adelia Yesya Putri Ika Fitri Ulfindrayani Imas Masriah NUNIK ARDIANA Nurani Ikhlas Nurull Fanani Pangestika, Inten Pratiwi, Pina Budiarti Qurrota A’yuni Roslian Lubis Sulwiyatul K Sani