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All Journal Teknomekanik Bulletin of Chemical Reaction Engineering & Catalysis
Nguyen, Van Cuong
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Chemical Engineering, Chemistry & Bioengineering Chemistry Mechanical Engineering

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Effect of the Dimethylformamide/Isopropanol Solvent Ratio on the Structure, Optical Properties, and Photodegradation Performance of RhB Using Bi-MOF Bui Bao Long, Pham; Nguyen, Van Cuong; Pham, Hoang Ai Le; Ta, Qui Thanh Hoai; Dang, Huu Phuc
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20345

Abstract

This study investigated the structural characteristics, surface morphology, and photocatalytic activity of bismuth-based metal-organic frameworks (BiBTC-ISOx) synthesized with varying ratios of N, N-dimethylformamide (DMF) and isopropanol (ISO). X-ray diffraction confirmed the crystalline structure of the BiBTC-ISOx (x = 1, 3, 6) compounds, while FTIR spectroscopy verified the successful bonding between the ligand and the Bi3+ complex. UV-Vis spectroscopy revealed strong UV light absorption with tunable bandgaps ranging from 3.28 to 3.68 eV. Nitrogen adsorption/desorption analysis revealed a hierarchical micro/mesoporous structure, with BiBTC-ISO6 exhibiting the highest surface area (24.968 m2/g). SEM imaging revealed a rectangular rod-like morphology, which became more elongated with increasing ISO content. The photocatalytic activity of BiBTC-ISOx was evaluated based on the degradation of Rhodamine B (RhB) under visible light, with BiBTC-ISO6 demonstrating the highest efficiency. Optimal conditions for RhB degradation were determined to be 0.03 g catalyst mass, 10 ppm RhB concentration, and pH of 3. Mechanistic studies revealed that superoxide radicals are the primary active species in the photocatalytic process. The BiBTC-ISO6 catalyst exhibited excellent stability and reusability over three consecutive degradation cycles, highlighting its potential for practical applications in organic dye removal. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Tunable Optical and Photoluminescence Properties of Metal X (Ni, Co, Mn, Ag)-Doped ZnSe Quantum Dots: Structural, Spectroscopic, and Colorimetric Analysis Bui, Thi Diem; Nguyen, Quang Liem; Nguyen, Van Cuong; Nguyen, Trong Tang; Dang, Huu Phuc
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 2 Year 2025 (August 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20372

Abstract

This study explores the impact of Ni, Co, Mn, and Ag doping on the optical and photoluminescence properties of ZnSe quantum dots (QDs). Structural analysis confirms successful dopant incorporation, with XRD revealing lattice strain-induced shifts. Optical studies show that Ni²⁺ and Co²⁺ induce blue shifts, while Mn²⁺ and Ag⁺ create redshifted emissions. Photoluminescence analysis demonstrates that Mn²⁺ doping enhances quantum efficiency to 49.52% via the 4T1 → 6A1 transition. Ag+-doped ZnSe exhibits blue-shifted emissions but suffers from defect-related non-radiative losses. CIE color coordinates validate tunable emissions, confirming potential applications in LEDs, displays, and bioimaging. These findings provide insights into dopant-induced band structure modifications, advancing the design of high-performance luminescent materials for optoelectronics. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Microstructural and mechanical properties of 17-4PH stainless steel fabricated via material extrusion 3D printing Cao, Dang Long; Nguyen, Van Cuong; Thi, Van Nga Tran
Teknomekanik Vol. 8 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i1.34872

Abstract

This study investigates the microstructural and mechanical properties of metal 3D printing products fabricated using material extrusion technology. It focuses on the critical post-processing stages: printing, washing, and sintering. A Markforged 3D printing system and 17-4 PH stainless steel material were utilized to assess the effect of printing orientation and sintering conditions on microstructural and mechanical properties of the final product. The results demonstrate that printing orientation and sintering conditions critically govern the microstructural and mechanical properties of the final product. During sintering, the microstructure undergoes significant phase transformation and densification, while micropores and shrinkage voids emerge due to capillary stresses during binder removal. Furthermore, the mechanical properties are significantly influenced by the combined effects of printing orientation and sintering conditions. Optimizing deposition parameters (printing orientations and sintering conditions) substantially enhances the mechanical performance of the final printed product.
Co-Authors Bui Bao Long, Pham Bui, Thi Diem Cao, Dang Long Dang, Huu Phuc Nguyen, Quang Liem Nguyen, Trong Tang Pham, Hoang Ai Le Ta, Qui Thanh Hoai Thi, Van Nga Tran