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All Journal KOVALEN: Jurnal Riset Kimia Chimica et Natura Acta Jurnal Sains dan Teknologi Jurna Beta Kimia Jurnal Bakti Nusantara Journal of Chemistry Sciences and Education Nexus
Imas Masriah
Program Studi Teknik Rekayasa Kimia Industri, Teknik Mesin, Politeknik Negeri Medan
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Veterinary Other

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Sintesis Nanopartikel Codoped Ceria Melalui Metode Sol-Gel Menggunakan Ekstrak Jeruk Lemon (Citrus limon) Sebagai Agen Pengkelat Imas Masriah; Arie Hardian; Dani Gustaman Syarif
Chimica et Natura Acta Vol 6, No 2 (2018)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (450.551 KB) | DOI: 10.24198/cna.v6.n2.16477

Abstract

Ceria dengan dopan ganda (codoped) merupakan salah satu alternatif elektrolit padat untuk sel bahan bakar padatan oksida suhu menengah (Intermediate Temperature – Solid Oxide Fuel Cell, IT-SOFC). Tujuan penelitian ini adalah untuk melakukan sintesis dan karakterisasi nanopartikel ceria terdoping Gadolinia 10% dan Neodimia 10% dengan metode sol-gel menggunakan asam sitrat atau ekstrak jeruk lemon sebagai agen pengkelat. Ce0,8Gd0,1Nd0,1O1,9 (GNDC1010) telah berhasil disintesis dengan metode sol-gel menggunakan asam sitrat dan ekstrak jeruk lemon dengan variasi pH 5; 7; dan 9. Berdasarkan hasil XRD, pola XRD dari GNDC1010 memiliki kemiripan dengan pola XRD dari struktur fluorit ceria murni (JCPDS ICDD: #00-034-394). Pergeseran 2θ ke arah yang lebih kecil dari pola difraksi GNDC1010 dibandingkan dengan ceria murni mengindikasikan terjadinya ekspansi kisi. Berdasarkan hasil penghalusan (refinement) GNDC1010 hasil sintesis memiliki struktur kubik dengan grup ruang Fm3m dan parameter kisi pada rentang 5,435(1) hingga 5,4438(7) Å. Ukuran kristalit (persamaan Scherrer) GNDC1010 ekstrak berada pada rentang 4,27nm hingga 13,85nm.
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.
Reevaluasi Miskonsepsi Struktur Atom Dan Partikel Subatom Serta Implikasinya Terhadap Pemahaman Ilmiah: Studi Literatur Moneteringtyas, Prisca Caesa; Meidita Kemala Sari; Inten Pangestika; Dini Novi Rohmah; Imas Masriah
Journal of Chemistry Sciences and Education Vol 2 No 01 (2025): Journal of Chemistry Sciences and Education
Publisher : PT. Pubsains Nur Cendekia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69606/jcse.v2i01.229

Abstract

Misconceptions about atomic structure and subatomic particles are a systemic issue in chemistry education, hindering the understanding of advanced concepts and limiting critical thinking. This study aims to identify common misconceptions, explore their root causes, and propose effective corrective strategies. A literature review of 20 peer-reviewed articles was conducted using thematic analysis across three main focuses. Findings reveal that deterministic views of the Bohr model, confusion over technical terms, and misinterpretation of symbolic representations are the most prevalent misconceptions. These stem from unadaptive teaching methods, cognitive limitations, and misleading visuals. Effective remedies include cognitive conflict, dynamic visualizations, and historical-metacognitive approaches to support conceptual change and deepen scientific understanding.
Jurnal Review: Potensi Biji Kebiul (Caesalpinia bonduc) sebagai Bahan Baku Minuman Herbal Fungsional Inten Pangestika; Imas Masriah; Prisca Caesa Moneteringtyas; Efriyana Oksal; Shally Sapitri
Nexus Sains dan Teknologi Vol. 1 No. 1 (2025): Nexus: Jurnal Sains dan Teknologi
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/nst.v1i1.2363

Abstract

Masyarakat Indonesia secara turun-temurun telah mempercayai dan menggunakan tanaman herbal untuk mengobati berbagai penyakit. Tanaman herbal tersebut disajikan dengan cara yang sederhana seperti diseduh dan diminum untuk mengobati berbagai masalah kesehatan ataupun untuk memelihara kesehatan tubuh. Salah satu tanaman yang berpotensi sebagai minuman herbal adalah biji kebiul (Caesalpinia bonduc) karena berbagai penelitian telah membuktikan bahwa biji kebiul memiliki kandungan senyawa metabolit sekunder yang memiliki aktivitas sebagai antimalaria, antibakteri, antifungi, antiinflamasi, antioksidan, antidiabetes, dan lain-lain.
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.
Co-Authors Adelia Yesya Putri Hasibuan Alexander Sebayang Arie Hardian Ayu Syufiatun Tarigan Dani Gustaman Syarif Devi Lestari Dikki Miswanda Dini Novi Rohmah Efriyana Oksal Fajar Nugraha Hasibuan, Adelia Yesya Putri Inten Pangestika Meidita Kemala Sari Muhammad Idris Pangestika, Inten Pratiwi, Pina Budiarti Prisca Caesa Moneteringtyas Prisca Caesa Moneteringtyas Shally Sapitri Siti Mahmudha Sulwiyatul K Sani