Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability.

To provide an economical magnetic photocatalyst and introduce an innovative approach for efficiently utilizing discarded waste rice noodle (WRN) and iron oxide scale (IOS), we initially converted WRN into carbon quantum dots (CQDs) using a hydrothermal method, simultaneously calcining IOS to obtain iron oxide (FeO). Subsequently, we successfully synthesized a cost-effective, magnetic CQDs/FeO photocatalytic composite for the first time by combining the resulting CQDs and FeO. Our findings demonstrated that calcining IOS in an air atmosphere enhanced the content of photocatalytically active α-FeO, while incorporating WRN-based CQDs into FeO improved the electron-hole pair separation, resulting in increased O reduction and HO oxidation.

CQDs/ZnO composites based on waste rice noodles: preparation and photocatalytic capability.

To provide a low-cost photocatalyst and new methodology for the utilization of waste rice noodle (WRN), a carbon quantum dots/zinc oxide (CQDs/ZnO) composite using WRN as the raw material was synthesized and characterized. The CQDs/ZnO composite based on WRN exhibited a highly efficient photocatalytic degradation effect on various organic pollutants and could be a good alternative for commercial ZnO. For methylene blue, the CQDs/ZnO composite showed a good degradation rate of 99.