Seminar khoa học của PGS. TS Lã Đức Dương và TS. Lưu Xuân Cường

Vào 14h00, ngày 21/02/2025 Viện IAST tổ chức buổi trao đổi học thuật tại Phòng họp B với nội dung chi tiết như sau: 

PGS.TS Lã Đức Dương trình bày về "Advanced MXene-porphyrin nanofiber hybrid materials for high-performance photocatalytic degradation of rhodamine B"

Tóm tắt: 

Developing new photocatalysts capable of efficiently harnessing photon energy across a broad solar spectrum is crucial for practical applications. This study focuses on fabricating Ti3C2 MXene materials by etching the Al layer with 40% HF acid. A nanofiber composite of MXene/porphyrin was prepared through self-assembly reprecipitation using MXene nanoparticles and tetrakis(4-carboxyphenyl) porphyrin monomer (TCPP) precursors. The composite was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) analysis. The results demonstrated that the MXene nanoparticles, with thicknesses <100 nm and 10-20 µm diameters, were well integrated into the TCPP nanofiber network. The resulting composite exhibited synergistic photocatalytic activity of both MXene and TCPP nanofibers. The MXene/TCPP photocatalyst achieved superior performance in the degradation of Rhodamine B (RhB), with a removal rate of 97.50% after 50 minutes of simulated sunlight irradiation, demonstrating the combined effect of MXene and TCPP nanofibers. The active species involved in the photocatalytic reaction were identified as O2 and OH, contributing to enhanced photocatalytic efficiency through charge transfer processes between the hybrid materials. This work highlights the potential of MXene/porphyrin composites in environmental remediation, offering a cost-effective and efficient solution for degrading harmful organic dyes in wastewater.

2/ TS. Lưu Xuân Cường trình bày về "Rutin Extraction and Purification from Sophora japonica L.: From Laboratory Research to Industrial Process"

Tóm tắt: 

Rutin, a flavonoid with diverse applications in medicine, food, and other industries, is primarily extracted from Sophora japonica L. This study investigates the extraction of rutin using ethanol/methanol solvents, considering their safety and environmental benefits. Laboratory experiments evaluated the effects of solid-to-solvent ratio and extraction time on rutin recovery efficiency. The purification process, aimed at achieving a purity of >95%, revealed that solvent type, solvent volume, and process sequence significantly influenced purification efficiency. Additionally, industrial-scale processes were examined, including process design and equipment selection.