摘要
采用水解法结合高温煅烧合成了一种高效的α-Fe_(2)O_(3)/石墨相氮化碳(g-C_(3)N_(4))复合材料,通过控制前驱液中Fe^(3+)的含量设定复合材料中α-Fe_(2)O_(3)的质量分数依次为1%,3%,5%和7%,考察了复合材料在可见光照射下对罗丹明B(RhB)的光降解性能。光催化实验结果表明:与纯g-C_(3)N_(4)相比,复合材料的光催化性能均得到有效提升,α-Fe_(2)O_(3)的最佳含量为3%(质量分数);90min内用量为20mg的3%α-Fe_(2)O_(3)/g-C_(3)N_(4)复合材料对高浓度(20mg/L)RhB溶液的降解率高达87%,而相同条件下纯g-C_(3)N_(4)的降解率仅为27%;一级动力学拟合曲线揭示3%α-Fe_(2)O_(3)/g-C_(3)N_(4)的光催化降解速率最高为0.0167,是纯g-C_(3)N_(4)降解速率的9.36倍。复合材料的高催化活性归因于α-Fe_(2)O_(3)的引入,在材料内部形成了p-n结,有效地抑制了光生-电子空穴对的复合。
A new effective composite catalyst of α-Fe_(2)O_(3)/g-C_(3)N_(4) was synthesized through hydrolyzing method combined with calcination process.The weight percent of theα-Fe_(2)O_(3) in this composite was designed to be 1%,3%,5% and 7% respectively by controlling the mass of the Fe^(3+) in the precursors.The photocatalytic performance of the samples to rhodamine B(RhB)pollutions was investigated.The results confirmed that compared with pure g-C_(3)N_(4),all composite materials exhibited much better photocatalytic performance,and the optimum was 3%(weight percent),whose degradation efficiency for RhB(20mg/L)can reach up to 87% in 90min.Nevertheless,the pure g-C_(3)N_(4) merely achieve 27% at the same condition.The 3% α-Fe_(2)O_(3)/g-C_(3)N_(4) composite also had the highest degradation rate constant 0.0167,which was almost 9.36 times compared with pureα-Fe_(2)O_(3) sample.The excellent photocatalatic performance can be ascribed to the appearance of theα-Fe_(2)O_(3) phase in the samples,leading the formation of the p-n heterojunctions betweenα-Fe_(2)O_(3) and g-C_(3)N_(4),which hugely depressed the combination of the photogenerated electrons-holes.
作者
严超
周迅
籍浩齐
匡代洪
杨占金
杨方源
Yan Chao;Zhou Xun;Ji Haoqi;Kuang Daihong;Yang Zhanjin;Yang Fangyuan(School of Math and Physics,Xinjiang Agricultural University,Urumqi 830052)
出处
《化工新型材料》
CAS
CSCD
北大核心
2022年第9期201-205,共5页
New Chemical Materials
基金
新疆维吾尔自治区自然科学基金(2018D01A14)
中国博士后科学基金第67批面上资助(2020M673643XB)。
