酞菁铜对纳米α-Fe2O3光催化剂的表面改性  

Surface modification of nano α-Fe2O3 by copper phthalocyanine

作　　者：陈双影 慕志远 李志君[1,2] 曲阳[1,2] 井立强[1,2] CHEN Shuangying;MU Zhiyuan;LI Zhijun;QU Yang;JING Liqiang(Key Laboratory of Functional Inorganic Material Chemistry(Heilongjiang University),Ministry of Education,Harbin 150080,China;School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China)

机构地区：[1]功能无机材料化学教育部重点实验室(黑龙江大学),哈尔滨150080 [2]黑龙江大学化学化工与材料学院,哈尔滨150080

出　　处：《哈尔滨工业大学学报》2020年第6期134-139,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(U1805255,21905080)。

摘　　要：为推动纳米氧化铁基光催化材料在水体环境修复领域中的应用,针对氧化铁半导体导带底能级位置较正而导致的光生电子热力学还原能力不足及其表面催化活化O2位点少的科学问题,在控制合成小尺寸纳米氧化铁的基础上,通过复合改性实现对其光生电子的有效调控是关键.首先利用尿素调制的相分离水解-溶剂热法制备了小尺寸纯相α-Fe2O3.在此基础上,通过简单的湿化学法实现了CuPc对α-Fe2O3纳米粒子的表面改性.结果表明:所获得的最佳样品(CuPc和α-Fe2O3的质量比为1%)的光催化降解2,4-二氯苯酚(2,4-DCP)的活性达到了纯α-Fe2O3的2.5倍;利用紫外-可见漫反射光谱(DRS)、傅里叶红外光谱(FT-IR)、激光拉曼光谱(Raman)等手段对其进行了结构表征,揭示了CuPc与α-Fe2O3之间通过氢键作用实现有效连接;基于羟基自由基荧光测试及电化学分析表明光催化活性提高的主要原因有:CuPc的引入有效改善了其光生电荷分离效率,并且进一步促进了O2的活化;CuPc对长波可见光的特征吸收进一步改善了其可见光利用范围.该策略也适用于其他过渡金属酞菁对α-Fe2O3的修饰,并且均改善了α-Fe2O3的光催化性能.To promote the development of iron oxide-based photocatalysts and its application in the field of water environment remediation, the key is to tackle the issues of insufficient thermodynamic reaction capacity of electrons and poor surface catalytic sites for O2 catalytic activation due to the positive conduction band bottom position of iron oxide. In this regard, modulating the photo-generated electrons via modification on the controlled nano-sized iron oxide is an effective method for improving the photocatalytic activity of iron oxide. In this work, small sized pure α-Fe2O3 nanoparticles were synthesized by a urea modulate phase separation hydrolysis-solvothermal method. Based on this, the α-Fe2O3 nanoparticles were controllably modified by copper phthalocyanine(CuPc) through a simple wet chemical method. Results show that the as-prepared optimized sample(mass fraction of CuPc and α-Fe2O3 is 1%) exhibited nearly 2.5 times enhancement for photocatalytic 2,4-DCP degradation compared with the pure α-Fe2O3 sample. Through DRS, Raman, and FT-IR, it was revealed that CuPc and α-Fe2O3 had an effective interface connection by hydrogen bonding. Based on the analysis of hydroxyl radicals test and electrochemical test, the enhanced photocatalytic degradation activities could be attributed to the significantly improved photo-generated charge separation and the promoted O2 activation. In addition, the characteristic absorption of CuPc in longer wavelengths could further extend the range of visible-light response of the nanocomposites. Significantly, this efficient strategy can also be applied to other metal phthalocyanine materials for the modification of α-Fe2O3.

关 键 词：Α-FE2O3 CuPc修饰 环境光催化 光生电荷分离 2 4-DCP降解 

分 类 号：O64[理学—物理化学]