Urea-modified Bi2MoO6 friction-catalyzed oxidative degradation of rhodamine B
Urea modified Bi2MoO6(Urea-Bi2MoO6)catalyst was prepared by a hydrothermal method,and its microstructure was characterized by SEM,XRD,XPS,BET,etc.The crystallinity of Bi2MoO6 modified by urea was improved,and it exhibited excellent frictional catalytic performance.Under the conditions of a rotational speed of 700r/min,RhB initial concentration of 5mg/L,catalyst dosage of 1g/L,and 35mm PTFE magnetic particles,the degradation of RhB reached 99.02％after 300min.The friction catalyzed oxidation degradation of RhB by Urea-Bi2MoO6 followed first-order reaction kinetics equation After 5cycles of Urea-Bi2MoO6 friction catalysis,RhB degradation remained above 91.6％.EPR confirmed that h+,·O2-,and·OH radicals were generated during the friction catalytic process of Urea Bi2MoO6.And scavenger test for radicals confirmed that h+was the main substance causing RhB to be degraded.Urea-Bi2MoO6 is stimulated by friction,producing electron(e)-hole(h+)pairs.H+reacts with OH-to generate·OH,and e reacts with O2 in water to generate·O2-,then RhB is degraded by them.
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