ABSTRACT Green synthesis offers a sustainable and efficient route for the fabrication of inorganic nanoparticles due to its environmental compatibility, simplicity, and cost‐effectiveness. In this study, the primary objective was to develop a rapid, eco‐friendly, and microwave‐assisted method for the synthesis of lanthanum oxide (La 2 O 3 ) nanoparticles using a dual biogenic system of tea leaf and Aloe vera extracts, and to evaluate their catalytic and antibacterial performance. The plant extracts, rich in bioactive phytochemicals such as alkaloids and polyphenols, acted as natural reducing and stabilizing agents. The synthesized nanoparticles were thoroughly characterized by FT‐IR, XRD, SEM, TEM, and BET surface area analyses. Structural and morphological investigations revealed the formation of well‐defined nanoplate‐like La 2 O 3 nanoparticles with thicknesses of 20–50 nm and lateral dimensions of 150–300 nm. BET analysis demonstrated a moderate increase in surface area and pore volume, thereby indicating enhanced catalytic accessibility. The La 2 O 3 nanoparticles exhibited excellent catalytic performance toward the rapid degradation of organic dyes such as methylene blue and methyl orange, achieving complete degradation within 18–33 min, along with excellent stability over five consecutive cycles. In addition, the nanoparticles showed significant antibacterial activity against both Escherichia coli and Staphylococcus aureus . Overall, this study demonstrates the effectiveness of plant‐mediated green and microwave‐assisted synthesis routes for producing catalytically and biologically active La 2 O 3 nanoparticles with promising applications in environmental remediation and biomedical fields.
Sarkar et al. (2026) studied this question.