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Bui, Thi Diem
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Polyethyleneimine-Functionalized Magnetic Bagasse Composite for Efficient Adsorptive Removal of Yellow 4GL and Black R–S Dyes Vu, Thi Thuy Hong; Bui, Thi Diem; Nguyen, Le Huu Khanh; Nguyen, Thi Hong Anh
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.20368

Abstract

Efficient removal of dye contaminants from wastewater remains a significant environmental challenge. In this study, a polyethyleneimine (PEI)-modified magnetic bagasse composite was synthesized by integrating sugarcane bagasse, PEI, Fe₃O₄ nanoparticles, and glutaraldehyde as cross-linking. The synthesized material was comprehensively characterized using SEM, BET, XRD, TGA, and FTIR techniques to elucidate its structural and physicochemical properties. Adsorption experiments were performed to investigate the effects of adsorbent dosage, initial dye concentration, pH, and contact time on the removal efficiency of Yellow 4GL and Black R-S dyes. The PEI-magnetic bagasse composite (PMBC) demonstrated impressive adsorption capacities of 185.19 mg/g for Yellow 4GL and 204.08 mg/g for Black R-S. The adsorption kinetics conformed to the pseudo-second-order model, indicating that chemisorption dominated the process, driven by electrostatic interactions and hydrogen bonding between the amino groups of PEI and the sulfonate groups of the dyes.
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).
Effect of Surface Stabilizers on the Optical Properties of ZnSe/ZnS:Mn/ZnS Nanocrystals Bui, Thi Diem; Nguyen, Quang Liem; Cuong, Nguyen Van; Nguyen, Trong Tang
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20454

Abstract

In this study, we produced nano-sized, spherical ZnSe/ZnS:Mn/ZnS in a non-toxic aqueous solvent with surface stabilizers such as 3-mercaptopropionic acid (MPA), polyethylene glycol (PEG), and starch. These surface stabilizers aid to prevent agglomeration and passivation, thereby stabilizing the nanoparticle surface. ZnSe/ZnS:Mn/ZnS nanocrystals (NCs) are cubic in structure. Changing the surface stabilizer and doping Mn metal does not alter the structure of the ZnSe base material, but it boosts fluorescence efficiency by 2.2 - 3.9 times. The fluorescence efficiency of ZnSe/ZnS:Mn/ZnS MPA NCs using MPA stabilizer is 73.95%, which is higher than the fluorescence efficiency of ZnSe/ZnS:Mn/ZnS Starch NCs (57.35%) using Starch stabilizer and higher than the fluorescence efficiency of ZnSe/ZnS:Mn/ZnS PEG NCs (41.72%) using PEG stabilizer. ZnSe/ZnS:Mn/ZnS MPA NCs are originally assessed for their potential use in biomedical applications. 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).
Co-Authors Cuong, Nguyen Van Dang, Huu Phuc Nguyen, Le Huu Khanh Nguyen, Quang Liem Nguyen, Thi Hong Anh Nguyen, Trong Tang Nguyen, Van Cuong Vu, Thi Thuy Hong