摘要
以Ta2O5和NaOH为起始原料,三聚氰胺(C3N6H6)为氮源采用改进的高温固相法制备了N掺杂NaTaO3(NaTaO3-xNx)光催化剂,并以亚甲基为目标降解物,在紫外光下研究NaTaO3-xNx的光催化活性。实验结果表明:改进固相法能够在700℃下得到结晶度高、粒径大小均一的N掺杂的NaTaO3,且实验过程中不需要二次研磨,提高了NaTaO3-xNx在紫外光下的吸收活性。光催化活性的大小与N的掺入量有关,样品NaTaO2.961N0.039具有较高的光催化活性。而且,NaTaO3-xNx在光降解过程中非常稳定,500℃煅烧后可重复利用,是一种很有前途的光催化剂。
N-doped NaTaO3compounds(NaTaO3- xNx) were successfully synthesized by using NaTaO3 prepared at low calcination temperature as starting material and melamine(C3H6N6) as nitrogen source.The photocatalytic activities of NaTaO3- xNxwere examined by methylene blue(MB) aqueous solution under UV light.NaTaO3 precursor was prepared by an improved solid state reaction method.Such method requires low calcination temperature( only 700℃),and avoidance of intermittent grinding,resulting in the improved photocatalytic activity of NaTaO3- xNx.The results found that the photocatalytic activity of NaTaO3- xNxdepends strongly on the doping content of N,and sample NaTaO2.961N0.039 shows the highest photocatalytic activity for the degradation of MB.Furthermore,it is also found that NaTaO3- xNxcatalysts display super structural stabilities during photocatalytic degradation,and could recover their photocatalytic activity after calcination at 500 ℃,suggesting a promising utilization of such photocatalyst.
出处
《环境工程》
CAS
CSCD
北大核心
2014年第S1期951-956,960,共7页
Environmental Engineering
关键词
光催化
N掺杂钽酸钠
钙钛矿
亚甲基蓝
N-doped NaTaO3
photocatalytic activity
perovskite
methylene blue
