Investigation of Magnetism and Photocatalytic Activity Using Biomass‐Derived Carbon Dots

Abstract A cost‐effective and green synthesis method was adopted for the synthesis of carbon dots (CDs) using easily available biomass, namely, Triticum (wheat), by varying the pyrolysis time. The synthesized CDs are labeled as A 1h, A 2h, and A 3h, respectively, where “A” represents the raw material, and “1h,” “2h,” and “3h” denote the respective pyrolysis time. XRD analysis reveals the turbostratic nature of the synthesized CDs. The size and shape of synthesized samples were visualized by HRTEM images. The bandgap was calculated by Tauc's plot and was determined to be 3.66, 5.08, and 4.89 eV for A 1h, A 2h, and A 3h, respectively. FTIR measurement analyzed the functional groups present on the surface of CDs. VSM measurement confirms the ferromagnetic behavior of CDs. Synthesized CDs have been used for photocatalytic degradation of rose bengal (RB) dye under UV light irradiation. Photocatalytic degradation increases with a decrease in bandgap and the maximum degradation efficiency (90.28%) was obtained for A 1h sample.