Integrated Nanostructures of TiO2/g-C3N4/Diatomite Based on Low-Grade Diatomite as Efficient Catalyst for Photocatalytic Degradation of Methylene Blue: Performance and Mechanism

The comprehensive utilization of low-grade diatomite resources and the effective treatment printing dyeing wastewater have attracted widespread attention. combined scrubbing-magnetic separation-acid leaching-roasting process was used to increase SiO2 content from 59.22% 86.93%, reduce Al2O3 18.32% 6.75%, Fe2O3 6.85% 1.24% in Heilongjiang, China. TiO2/g-C3N4/diatomite nanocomposite prepared by a facile ultrasonic-thermal polymerization method. In this ternary structure, skeleton effectively increased surface area with abundant adsorption sites, prevented g-C3N4 restacking, facilitated separation electrons holes via formation TiO2/g-C3N4 heterojunctions. degradation rate 98.77%, 90.59%, 89.16% for three catalytic reaction cycles MB solution, respectively. composite showed high solution after cycles, which indicated that had good recyclability. Through free radical capture test, it elucidated O2−·, h+, ·OH all played role photocatalytic O2−· mainly responsible oxidation mechanism, kinetics were further investigated. This nanostructured has fascinating visible light activity excellent stability.