Engineering n-Type and p-Type BiOI Nanosheets: Influence of Mannitol on Semiconductor Behavior and Photocatalytic Activity.

Photocatalytic technology holds significant promise for sustainable development and environmental protection due to its ability to utilize renewable energy sources and degrade pollutants efficiently. In this study, BiOI nanosheets (NSs) were synthesized using a simple water bath method with varying amounts of mannitol and reaction temperatures to investigate their structural, morphological, photoelectronic, and photocatalytic properties. Notably, the introduction of mannitol played a critical role in inducing a transition in BiOI from an n-type to a p-type semiconductor, as evidenced by Mott-Schottky (M-S) and band structure analyses.

Dual-functional CuO/g-CN heterojunctions: a high-performance SERS sensor and photocatalytic self-cleaning system for water pollution detection and remediation.

This study introduces a multifunctional device based on CuO/g-CN monitoring and purification p-n heterojunctions (MPHs), seamlessly integrating surface-enhanced Raman scattering (SERS) detection with photocatalytic degradation capabilities. The SERS and photocatalytic performances of the CuO in various morphologies, g-CN nanosheets (NSs) and CuO/g-CN MPHs with different g-CN mass ratios were systematically evaluated, with a particular emphasis on the CuO/g-CN-0.2 MPH, where g-CN constituted 20% of the total mass.

Photocatalytic Enhancement and Recyclability in Visible-Light-Responsive 2D/2D g-CN/BiOI p-n Heterojunctions via a Z-Scheme Charge Transfer Mechanism.

With the intensification of the energy crisis and the growing concern over environmental pollution, particularly the discharge of organic dye pollutants in industrial wastewater, photocatalytic degradation of these contaminants using solar energy has emerged as an effective, eco-friendly solution. In this study, we successfully synthesized 2D/2D g-CN/BiOI p-n heterojunctions via a simple precipitation method and a high-temperature calcination method. The unique 2D structures of g-CN nanosheets (NSs) and BiOI NSs, coupled with the synergistic effect between the two materials, significantly enhanced the photocatalytic degradation performance of the heterojunctions under simulated sunlight.