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All Journal KOVALEN: Jurnal Riset Kimia CHEESA: Chemical Engineering Research Articles Jurnal Sains dan Teknologi Jurna Beta Kimia Jurnal Bakti Nusantara Scripta Economica: Journal of Economics, Management, and Accounting
Devi Lestari
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Veterinary 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.
Analisis Kualitas Air Hygiene Sanitasi Secara Fisika dan Kimia di Perumahan Green View Sunggal Devi Lestari; Imas Masriah; Sulwiyatul Kamariah Sani; Siti Mahmudha; Adelia Yesya Putri Hasibuan
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 3 (2025): Juni 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i3.5309

Abstract

This study analyzed the quality of borehole water in Green View Sunggal Housing located in a rice field area. This research used a descriptive analytical method with a cross-sectional design. Samples were taken from 25 boreholes through a purposive sampling technique divided into three zones: north (8 wells), middle (7 wells), and south (10 wells). The parameters evaluated included physical aspects (temperature, odor, taste, color, turbidity) and chemical aspects (pH, hardness, Fe, Mn, nitrate, nitrite, chloride). Laboratory analysis was carried out at the Medan State Polytechnic following SNI standards and the APHA method, with statistical analysis using SPSS for Pearson correlation and linear regression. The results showed that the majority of parameters met the standards of Permenkes No. 32 of 2017. The parameters of temperature, odor, taste, hardness, manganese, nitrate, nitrite, and chloride reached a compliance level of 100%. However, there were discrepancies in color (92%), turbidity (84%), pH (64%), and iron content (80%). Samples from the southern zone adjacent to rice fields within a 200-meter radius showed significant problems with acidic pH (5.8-6.4) and excessive iron content (1.12-1.42 mg/L). Statistical analysis revealed significant correlations between well depth, distance from rice fields, and water quality. Distance from rice fields was the strongest predictor for nitrate (R² = 0.475) and iron (R² = 0.374). The study concluded that better environmental management is needed to maintain and improve water quality in the residential area.
A Review of Maghemite Nanoparticles as Environmental Sensors Imas Masriah; Devi Lestari; Prisca Caesa Moneteringtyas; Siti Mahmudha; Sulwiyatul Kamariyah Sani
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 3 (2025): Juni 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i3.5354

Abstract

The increasing urgency to monitor and mitigate environmental pollution has driven significant interest in the development of advanced sensing technologies. Nanotechnology presents promising solutions through the application of nanoscale materials, among which maghemite nanoparticles (γ-Fe2O3) have garnered considerable attention due to their unique physicochemical properties, high chemical stability, a large specific surface area, and superparamagnetic behavior, making them suitable for separation, target deployment, and sensor regeneration. It functionalized maghemite nanoparticles to enhance their selectivity toward specific pollutants, including heavy metals ( e.g., Pb2+ and Cd2+) and toxic gases (e.g., NO, NH3, and H2S). These articles present a review of the structural and physicochemical characteristics of maghemite nanoparticles, including commonly applied synthesis methods, sensor mechanism, and their applications in pollutant detection, such as heavy metals and toxic gases. The review also highlights current challenges and outlines future directions for the development of more efficient, affordable, and sustainable maghemite-based sensors for next-generation environmental monitoring systems.
Evaluating the Potential of Modified Niobium (V) Oxide as Catalyst for 5-Hydoxymethylfurfural (HMF) Production : A Literature Review Inten Pangestika; Imas Masriah; Devi Lestari; Ayu Syufiatun Br Tarigan; Pina Budiarti Pratiwi
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 3 (2025): Juni 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i3.5385

Abstract

Selectively producing 5-hydroxymethylfurfural (HMF) from biomass-derived carbohydrates is key in valorizing renewable resources into biobased chemicals and fuels. HMF is a crucial bio-based platform chemical, but its selective production from glucose and fructose remains challenging due to side reactions and product degradation. Modified niobium(V) oxide (Nb2O5) catalysts have shown great promise owing to their intrinsic Brøntsted and Lewis acidity, thermal stability, and surface tunability. This review overviews recent advances in catalyst design, including metal doping, structural tuning, and hybridization with porous materials. These have significantly improved HMF yields -up to 80%- while enhancing catalyst selectivity and reusability. A systematic review with a descriptive-analytical approach was applied, analyzing literature from 2015 to 2025 across major scientific databases. Furthermore, challenges, including side-product formation and active site leaching, are highlighted alongside future perspectives for scalable and green HMF synthesis using Nb-based catalysts. This review aims to guide the rational development of modified Nb2O5 catalysts for efficient biomass transformation. These developments are crucial for advancing Nb-based catalytic platforms and unlocking the full potential of HMF in a circular, bio-based chemical industry.
Fitoremediasi In Vitro Logam Pb dan Cu Menggunakan Eceng Gondok (Eichhornia crassipes): Strategi Ramah Lingkungan dan Berkelanjutan Siti Mahmudha; Fajar Nugraha; Muhammad Idris; Imas Masriah; Devi Lestari
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 3 (2025): Juni 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i3.5459

Abstract

Heavy metal contamination, especially by lead (Pb) and copper (Cu), is a major environmental issue in aquatic ecosystems caused by industrial, mining, and agricultural activities. These metals are toxic, persistent, and bioaccumulative, posing risks to aquatic life and human health. Various remediation methods have been developed, including physical, chemical, and biological approaches; however, their effectiveness on a large scale remains limited. This study explores the potential of Eichhornia crassipes (water hyacinth) for in vitro phytoremediation of Pb and Cu. Plants were grown in Hoagland solution containing 100 mg/L of each metal. Metal accumulation in plant tissues was measured using Atomic Absorption Spectroscopy (AAS), and chlorophyll content was analyzed with a UV-Vis spectrophotometer. The results showed that Pb primarily accumulated in the roots, while Cu was more translocated to the leaves. Chlorophyll levels decreased more significantly in Cu-treated plants, indicating higher stress. These findings suggest that E. crassipes is a promising, cost-effective, and environmentally friendly option for the remediation of heavy metal-contaminated waters. The implementation of this technology could contribute to improving environmental quality and reducing the risk of heavy metal exposure to both ecosystems and human health.
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.
XRD Characterization and Structural Insights of Activated Carbon-ZnO Composite for Potential Photocatalytic Applications Lestari, Devi; Masriah, Imas; Hasibuan, Adelia Yesya Putri; Pratiwi, Pina Budiarti
Jurnal Beta Kimia Vol 5 No 2 (2025): Volume 5 Number 2, November 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i2.25811

Abstract

This study presents a structural characterization of an activated carbon-ZnO (AC/ZnO) composite synthesized via a simple sol-gel route using activated carbon derived from oil palm empty fruit bunches (OPEFB), introducing a sustainable biomass based carbon source as a functional photocatalytic support. X-ray diffraction (XRD) analysis revealed sharp diffraction peaks corresponding to the wurtzite ZnO phase, together with a broad amorphous carbon halo, confirming the successful incorporation of crystalline ZnO within the carbon matrix. Microstructural parameters, including crystallite size, lattice strain, and dislocation density, indicate nanoscale structural ordering accompanied by beneficial defect sites that promote charge trapping. Structural interpretation was further validated through Rietveld refinement, which confirmed a single-phase ZnO structure with good fitting quality, demonstrating the structural stability and compatibility of ZnO within the carbon framework. Photocatalytic evaluation using methylene blue showed a higher removal efficiency under natural sunlight (95%) compared to dark adsorption (85%), evidencing a synergistic adsorption-photocatalysis mechanism. The novelty of this work lies in integrating low temperature sol–gel synthesis, waste derived activated carbon, and XRD based microstrain and refinement analyses to establish a clear structure–function relationship in AC/ZnO composites. These findings highlight the practical potential of this material as a low cost, scalable, and solar responsive photocatalyst for sustainable wastewater treatment applications, particularly in resource limited and tropical regions.
XRD-Based Structural and Crystallite Size Analysis of Nano-MgO Prepared via Sol–gel Method Masriah, Imas; Lestari, Devi; Sani, Sulwiyatul Kamariyah; Pangestika, Inten; Miswanda, Dikki
KOVALEN: Jurnal Riset Kimia Vol. 11 No. 2 (2025): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2025.v11.i2.17909

Abstract

Nano-MgO was synthesized via a nitrate–citrate sol–gel combustion method, in which magnesium nitrate acted as the oxidizing precursor and citric acid served simultaneously as the chelating agent and organic fuel. The formation of a homogeneous Mg–citrate coordination network enabled controlled gelation, while the auto-combustion process produced a porous MgO matrix composed of ultrafine crystallites. Calcination at 800 °C promoted phase consolidation, removal of organic residues, and enhanced long-range atomic ordering. X-ray diffraction confirmed the exclusive formation of the cubic periclase phase (fm3m), with no detectable hydroxide or carbonate impurities. Crystallite size analysis yielded an average size of 16.03 nm based on the Scherrer equation, whereas the Williamson–Hall method produced a larger value of 25.44 nm with a microstrain of 5.37 × 10-4. indicating minimal lattice distortion. The discrepancy between the two size estimates reflects the contribution of microstrain effect not considered in the Scherrer approach. Overall, the synthesized nano-MgO exhibits high crystallinity, narrow crystallite size distribution, and excellent structural stability, highlighting its potential for catalytic, gas-sensing, and high-temperature functional applications. These results demonstrate that the sol–gel combustion method is an efficient and reliable strategy for producing nanocrystalline MgO with well-controlled structural characteristics.
Strategi Adaptasi Organisasi: Studi Kasus Transformasi Digital pada Perusahaan Manufaktur Arief Saptono; Devi Lestari
Journal of Economics, Management, and Accounting Vol 1 No 3 (2026): March: Scripta Economica: Journal of Economics, Management, and Accounting
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/600ew416

Abstract

This study examines organizational adaptation strategies in digital transformation within manufacturing firms through a qualitative interpretative library research design grounded in a critical constructivist epistemology. Drawing on systematically selected and thematically synthesized scholarly literature, the analysis integrates operational, structural, leadership, and human resource perspectives to explain how organizations respond to digital disruption. The findings demonstrate that successful digital transformation depends on the coherence between adaptive operational practices, flexible organizational structures, digitally oriented leadership, and continuous workforce capability development. Fragmented or technocentric approaches are shown to generate limited performance gains and organizational resistance. The study further highlights the relevance of dynamic capability theory in explaining how sensing, seizing, and reconfiguring processes enable sustainable adaptation. By synthesizing diverse empirical and conceptual contributions, this article advances an integrative framework that clarifies the mechanisms linking digital transformation and organizational performance in manufacturing contexts. Methodologically, the study contributes by offering a transparent and replicable approach to theory-driven literature synthesis.
Co-Authors A'yuni, Qurrota Adelia Yesya Putri Hasibuan Alexander Sebayang Arief Saptono Ayu Syufiatun Tarigan Dikki Miswanda Erlinda Ningsih Ningsih Fajar Nugraha Gaol, Binaria Lumban Hasibuan, Adelia Yesya Putri Ika Fitri Ulfindrayani Imas Masriah Muhammad Idris NUNIK ARDIANA Nurani Ikhlas Pangestika, Inten Pratiwi, Pina Budiarti Prisca Caesa Moneteringtyas Roslian Lubis Siti Mahmudha Sulwiyatul K Sani