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Phan Thanh Long, Đoàn Văn Đạt, Lê Thành Thọ, Lê Văn Tán; Đoàn Văn Đạt(1); 

NGHIÊN CỨU XÚC TÁC CHUYỂN HÓA CÁC CHẤT HỮU CƠ ĐỘC HẠI SỬ DỤNG NANO VÀNG TỔNG HỢP BẰNG PHƯƠNG PHÁP TIẾP CẬN XANH

CATALYTIC CONVERSION OF TOXIC ORGANIC COMPOUNDS USING GOLD NANOPARTICLES SYNTHESIZED VIA A GREEN APPROACH

Tạp chí Phân tích Hóa, Lý và Sinh học

2024

3A

09-16

Organic dyes such as methylene blue (MB) and bromocresol green (BCG), are significant contributors to water pollution if discharged untreated. This study explores the catalytic efficiency of gold nanoparticles(AuNPs) in the reduction reaction of these dyes with NaBH4. AuNPs were synthesized using a green, one-step method employing extracts from Helicteres hirsute Lour containing saponins, tannins, and flavonoids as both reducing and stabilizing agents. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analyses revealed that the AuNPs are spherical with an average particle size of 12.4 nm and are uniformly dispersed. The nanoparticles demonstrated high stability, as indicated by a zeta potential of -29.8 mV, attributed to electrostatic repulsion. Kinetic studies on the catalytic reduction of MB and BCG showed reaction rate constants of k = 0.4107 min⁻ ¹ and k = 0.3286 min⁻ ¹, respectively. Additionally, the activation energies for these reactions were calculated as -8.42 kJ/mol for MB and -35.21 kJ/mol for BCG, indicating effective catalysis and potential application in wastewater treatmen

Organic dyes such as methylene blue (MB) and bromocresol green (BCG), are significant contributors to water pollution if discharged untreated. This study explores the catalytic efficiency of gold nanoparticles(AuNPs) in the reduction reaction of these dyes with NaBH4. AuNPs were synthesized using a green, one-step method employing extracts from Helicteres hirsute Lour containing saponins, tannins, and flavonoids as both reducing and stabilizing agents. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analyses revealed that the AuNPs are spherical with an average particle size of 12.4 nm and are uniformly dispersed. The nanoparticles demonstrated high stability, as indicated by a zeta potential of -29.8 mV, attributed to electrostatic repulsion. Kinetic studies on the catalytic reduction of MB and BCG showed reaction rate constants of k = 0.4107 min⁻ ¹ and k = 0.3286 min⁻ ¹, respectively. Additionally, the activation energies for these reactions were calculated as -8.42 kJ/mol for MB and -35.21 kJ/mol for BCG, indicating effective catalysis and potential application in wastewater treatmen

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