摘要
本文合成了具备水滑石结构(LDH)的Zn-Cr LDH、Zn-Ti LDH以及Ag3PO43种半导体光催化剂,并对它们的催化性能进行对比研究。XRD和SEM分析表明,Zn-Cr LDH、Zn-Ti LDH具有层状结构而Ag3PO4呈纳米球状结构。UV-Vis分析表明,Ag3PO4和Zn-Cr LDH能够吸收可见光(>420 nm)。在可见光照射与添加AgNO3作为电子受体的条件下,Zn-TiLDH几乎没有光催化活性,而Ag3PO4的光催化活性高于Zn-Cr LDH。Ag3PO4在光解水实验中180 min内氧气产量约1.2mL,而Zn-Cr LDH约为0.65 mL。光催化降解有机污染物实验中,在Ag3PO4催化作用下,120 min内亚甲基蓝(MB)被完全降解,在240 min内46%的对硝基酚(PNP)被降解,而Zn-Cr LDH相应的去除率分别为61%和27%。
In this study,three semiconductor photocatalysts Ag3PO4,Zn-Cr and Zn-Ti were fabricated and the catalytical performances were investigated.It was showed that Zn-Cr and Zn-Ti possessed the structure of layered double hydroxide（LDH）,while Ag3PO4 exhibited nanosphere structure by XRD and SEM analysis.And by UV-vis analysis,Ag3PO4 and Zn-Cr was able to absorb visible light（〉420 nm）.However,there is no photocatalytic activity for Zn-Ti when AgNO3 acted as photoelectron acceptor with visible light.Also,it was suggested that Ag3PO4 was more efficient than Zn-Cr.In water splitting experiments,it was produced 1.2 mL and 0.65 mL O2 for Ag3PO4 and Zn-Cr within 180 min,respectively.For organic pollutants degradation,removal rates of methyl blue（MB） by Ag3PO4 and Zn-Cr were nearly 100% and 61%,respectively,within 120 min.Meanwhile,46% and 27% of p-nitrophenol（PNP） could be removed by Ag3PO4 and Zn-Cr,respectively,within 240 min.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第9期2929-2934,共6页
Chinese Journal of Environmental Engineering
基金
长江学者和创新团队发展计划资助项目(IRT0813)
国家"水体污染控制与治理"科技重大专项(2008ZX07208-004-2)
