摘要:本文以分子筛SBA-15为载体,预先吸附Bi(NO3)3,然后与NH4F均匀混合,一步煅烧法制备了可见光响应型NF-Bi2O3/SBA.研究发现,高温煅烧时,吸附在SBA上的Bi(NO3)3分解形成Bi2O3.与此同时,NH4F分解生成的HF优先刻蚀SBA,生成的NH3优先掺入Bi2O3晶格.Bi2O3负载在SBA-15上比表面积显著提升,共存NH4F能对Bi2O3进行N、F共掺杂改性,进一步窄化带隙,提升可见光响应,并调控Bi2O3的晶面结构,得到均匀片状的NF-Bi2O3,最终促进电子-空穴对的分离和传递.与Bi2O3、NF-Bi2O3和Bi2O3/SBA相比,NF-Bi2O3/SBA具有最佳的可见光催化活性,光催化还原Cr(Ⅵ)的速率常数是Bi2O3体系的6.3倍.
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