核壳结构β-NaYF_4:Yb^(3+),Tm^(3+)/TiO_2的制备及光催化性能  

Synthesis and Properties of Core-shell Structure Photocatalyst β-NaYF_4:Yb^(3+),Tm^(3+)/TiO_2

作　　者：黄民忠 陈建炜[2] 戴乐阳[1] 付明来[2] 

机构地区：[1]集美大学轮机工程学院,福建厦门361021 [2]中国科学院城市环境研究所,福建厦门361021

出　　处：《环境科学与技术》2015年第4期60-64,共5页Environmental Science & Technology

基　　金：福建省自然科学基金项目(E1310036;2013J01202)

摘　　要：核壳结构纳米复合材料β-Na YF4∶Yb3+,Tm3+/Ti O2的制备分为2个步骤:首先通过高温热分解法制备由上转换发光材料β-Na YF4∶Yb3+,Tm3+组成的核;再由钛酸四丁酯(TBOT)在表面活性剂聚乙烯吡咯烷酮K-30(PVP)作用下水解而成的壳。测试表明,β-Na YF4∶Yb3+,Tm3+/Ti O2是由β型六方相结构Na YF4纳米粒子和无定形结构的Ti O2组成。这种核壳结构纳米复合材料可以吸收近红外光(NIR),其中β-Na YF4∶Yb3+,Tm3+可以吸收近红外光,而后通过上行转换发出紫外光,通过激发Ti O2产生活性基团,达到催化降解有机污染物的目的。为了验证其光催化活性,在980 nm激光照射下将其用于罗丹明B(Rh B)的降解,结果证明该复合材料可以达到一定的降解效果。因此,核壳结构纳米复合材料β-Na YF4∶Yb3+,Tm3+/Ti O2是一种新型的近红外光催化剂,其能有效地扩展光催化剂对太阳能光谱的响应区域,提高太阳光的利用率,在未来Ti O2的光催化或者能源利用领域有着广阔的应用前景。Up-conversion photocatalyst β-NaYF4：Yb3＋, Tm3＋/TiO2 with core-shell structure was successfully synthesized by a two-step method. Firstly, up-conversion luminescence material β-NaYF4：Yb3＋, Tm3＋/TiO2 as core was prepared by a thermal decomposition processed, then the shell was formed via the hydrolysis of titanium n-butoxide （TBOT） under the presence of surfactant polyvinylpyrrolidone K-30（PVP）. It was found that β-NaYF4：Yb3＋, Tm3＋/TiO2 were consisted of hexagonal phase - NaYF4 nanoparticles as core and amorphous TiO2 as shell. The nanocomposite exhibited effective near-infrared （NIR） absorption and the energy transfer from β-NaYF4：Yb3＋, Tm3＋/TiO2 was confirmed. The photocatalytic activity of the catalysts was evaluated by the discoloration of RhB under 980 nm laser irradiation, and results suggested that the core-shell structured nanocomposite was an advanced NIR catalyst which might greatly improve the utilization of solar energy, and will contribute to the utilization of solar enerGY in the future.

关 键 词：上转换 β-Na YF4∶Yb3+ Tm3+/Ti O2 光催化 近红外 

分 类 号：X703[环境科学与工程—环境工程]