Claim Missing Document
Check
Articles

Found 2 Documents
Search
Journal : nexus

Magnetic Zeolite Composites for Heavy Metal Ions Removal: A Concise Review Wayan Gracias; Annisha Noor Dienna; Defia Indah Permatasari
Nexus Sains dan Teknologi Vol. 1 No. 2 (2025): Nexus: Jurnal Sains dan Teknologi (Edisi November)
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/nst.v1i2.2880

Abstract

Magnetic zeolite is a composite material that combines the porous characteristics of zeolite with the magnetic separation capability of magnetic nanoparticles. This study discusses the development of magnetic zeolite synthesis using several main methods, including hydrothermal synthesis, coprecipitation, and dry-gel conversion, each offering different levels of control over particle size, surface area, and magnetic strength of the resulting composite. The synthesized materials generally possess a high surface area and strong magnetic response, making  them  effective  for adsorbing heavy metal ions from aqueous solutions. The reported maximum adsorption capacities reach 625 mg g⁻¹ for Pb(II), 204 mg g⁻¹ for Cd(II), 181 mg g⁻¹ for Cu(II), more than 400 mg g⁻¹ for Cr(VI), and around 42 mg g⁻¹ for Ni(II). According to various studies, the adsorption of heavy metal ions onto magnetic zeolite commonly follows the pseudo-second-order kinetic model and the Langmuir isotherm, indicating that the adsorption process is dominated by a monolayer chemisorption mechanism. In addition to its high adsorption capacity, the main advantage of magnetic zeolite is the ease of separating it from the solution using an external magnetic field, making it an efficient adsorbent that can be easily recovered and reused.
Biomaterial Laut Berbasis Kimia Komputasi untuk Nanoteknologi Hijau: Literature Review Annisha Noor Dienna; Annisa Ananda; Ratri Mauluti Larasati
Nexus Sains dan Teknologi Vol. 2 No. 1 (2026): Nexus: Jurnal Sains dan Teknologi (Edisi Mei)
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/nst.v2i1.3310

Abstract

Penelitian ini bertujuan menganalisis perkembangan biomaterial laut berkelanjutan berbasis pendekatan computational chemistry melalui metode literature review deskriptif-kualitatif. Kajian dilakukan terhadap 22 artikel jurnal internasional tahun 2021–2026 yang membahas marine biomaterials, molecular docking, molecular dynamics simulation, nanotechnology, dan sustainable biomaterials. Hasil penelitian menunjukkan bahwa biomaterial laut seperti alginate, fucoidan, chitosan, carrageenan, marine collagen, phlorotannins, dan marine peptides memiliki potensi tinggi sebagai sustainable biomaterials karena bersifat biodegradable, biokompatibel, bioaktif, dan mendukung green material technology. Molecular docking menjadi pendekatan komputasi paling dominan untuk memprediksi binding affinity, molecular interaction, dan bioaktivitas biomaterial terhadap target biologis, sedangkan molecular dynamics simulation digunakan untuk mengevaluasi stabilitas kompleks biomaterial protein dan sifat mekanik biomaterial pada tingkat atomistik dan nanoscale. Selain itu, integrasi biomaterial laut dengan green nanotechnology dan computational modeling menunjukkan potensi besar dalam pengembangan hydrogel, scaffold, nanocarrier, biosensor, dan smart biomaterials berbasis sumber daya laut terbarukan. Penelitian ini juga mengidentifikasi research gap berupa keterbatasan validasi biologis, standardisasi biomaterial laut, dan minimnya integrasi AI-based biomaterials design. Dengan demikian, computational marine biomaterials berbasis sustainability berpotensi menjadi frontier research yang mengintegrasikan chemistry, nanotechnology, biotechnology, dan green material engineering modern.