新型层状结构可见光催化剂的制备与性能研究

Fabrication and Properties of Novel Layered Double Hydroxide Photocatalysts

以合成层状双羟基金属氧化物(LDH)为掺杂手段,制备了Zn-Cr LDH、Zn-Ti LDH两种半导体光催化剂。XRD和SEM分析表明Zn-Cr LDH和Zn-Ti LDH具有层状结构,层间距分别为0.73 nm和0.69 nm。UV-vis分析表明Zn-Cr LDH在410 nm和560 nm分别有2个最大吸收峰,而Zn-Ti LDH无法吸收400 nm以上的可见光。在可见光(≥420 nm)照射与添加AgNO3作为电子受体的条件下,光分解水实验中,反应300 min后Zn-Cr LDH产氧量约为0.79 mL。在光降解亚甲基蓝(MB)中,MB在反应300 min后被完全降解。而Zn-Ti LDH在实验中不具备光催化活性。

Zn-Cr Layered double hydroxide（LDH） and Zn-Ti LDH semiconductor photocatalysts were fabricated and tested.XRD and SEM confirmed the layered double hydroxide structure of Zn-Cr LDH and Zn-Ti LDH and the layer distance are 0.73 nm and 0.69 nm,respectively.It was found that Zn-Cr LDH is efficient in absorbing visible light（≥420 nm） but Zn-Ti LDH could not absorb visible light above 400 nm.With visible light irradiation and AgNO3 as photoelectron scavenger,about 0.79 mL oxygen was generated in water splitting experiments with Zn-Cr LDH in 300 min.And Zn-Cr LDH could completely decompose methyl blue（MB）in 300 min.Zn-Ti LDH had no photocatalytic activity in all experiments.