公开(公告)号：US20240302306A1

公开(公告)日：2024-09-12

申请号：US18179054

申请日：2023-03-06

申请人： KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

发明人： Muhammad KAMRAN ,  Mohamed Aly Mohamed MORSY ,  Tarek Abdelsamad Abdelrahman KANDIEL ,  Wissam IALI

IPC分类号： G01N24/10

CPC分类号： G01N24/10

摘要： A method for monitoring and evaluating the photocatalytic activity of a photocatalytic substance is described. The method includes dispersing particles of the photocatalytic substance in a 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL) solution to form a photocatalytic suspension; introducing a gas composition to a reactor containing the photocatalytic suspension in the dark to form a purged photocatalytic suspension; illuminating the purged photocatalytic suspension with a light to initiate a photocatalytic reaction and generate a reactive oxygen species (ROS) that is detectable by an electron paramagnetic resonance (EPR) spectrometer; introducing a portion of the purged photocatalytic suspension to the EPR cell in the cavity of the EPR spectrometer to generate an EPR signal and recirculating the portion of the purged photocatalytic suspension back to the reactor; reacting TEMPOL with the ROS to form a EPR silent compound; continuously recording the EPR signal.