Gd-N Co-doped TiO2/macroporous resin photocatalyst for enhanced visible-light degradation of organic pollutants
To address the critical limitations of TiO 2 photocatalysts, including insufficient visible-light response and rapid carrier recombination, this study developed a Gd-N co-doped hierarchical porous TiO 2 -macroporous resin (Gd/N/TiO 2 -MAR) composite via a sol-gel hydrothermal method. Multi-scale characterizations (XRD, XPS, BET) revealed that Gd 3 ⁺ doping modulates the band structure and surface properties through 4f-2p orbital hybridization, extending the light response range while suppressing carrier recombination via electron trapping. The hierarchical porous architecture and interfacial synergy significantly enhanced the adsorption-photocatalytic degradation efficiency. Under visible light, the composite exhibited a 1.6-fold higher degradation rate constant for Rhodamine B compared to single N-doped systems, alongside stable performance across a broad pH range (2−12) and under coexisting ion interference. Radical trapping and adsorption-photodegradation kinetic analyses elucidated the cooperative mechanism of interfacial charge transfer and reactive species generation. This work provides new structural design principles for developing efficient multifunctional materials for environmental remediation.
危险品化学品经营许可证（带存储）