炭黑/黑色TiO₂复合材料的制备及其光催化性能

Black TiO₂ (b-TiO₂) was synthesized by hydrothermal and chemical reduction methods. Taking advantage of the adhesion effect of poly-dopamine (PDA), CB/b-TiO₂ composite material was prepared by modifying b-TiO₂ with carbon black (CB). The crystal structure, chemical composition and micro-morphology of the composites were characterized by XRD, XPS, SEM and TEM. The effect of mass ratio of CB to b-TiO₂ on morphology and properties of CB/b-TiO₂ was studied. The effect of the amount of CB/b-TiO₂on photocatalysis degradation properties was also studied and the amount of CB/b-TiO₂ was optimized. The results show that when the mass ratio of CB to b-TiO₂ is 1: 2, the obtained CB/ b-TiO₂ has high light absorption performance in the wide spectrum range, CB/b-TiO₂exhibits excellent photocatalytic performance. Besides, when the amount of CB/b-TiO₂ is 0.5 g/L, the target pollutant malachite green solution MG (10 mg/L) can be degraded by 99.5% after 3 min. Besides, a high degradation rate of 89.2% can still be maintained after 5 cycles, showing good regeneration and utilization performance.