Improving photocatalytic activity by combining upconversion nanocrystals and Mo-doping: a case study on beta-NaLuF4:Gd,Yb,Tm@SiO2@TiO2:Mo

Yin Dongguang; Zhang Lu; Cao Xianzhang; Tang Jingxiu; Huang Wenfeng; Han Yanlin; Liu Yumin; Zhang Tingting; Wu Minghong

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Improving photocatalytic activity by combining upconversion nanocrystals and Mo-doping: a case study on beta-NaLuF4:Gd,Yb,Tm@SiO2@TiO2:Mo

机译：通过结合上转换纳米晶体和Mo掺杂提高光催化活性：以β-NaLuF4：Gd，Yb，Tm @ SiO2 @ TiO2：Mo为例

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A novel double-shell-structured beta-NaLuF4:Gd,Yb,Tm@SiO2@TiO2:Mo nanocomposite photocatalyst has been developed for the first time. The nanocomposite consists of uniform b-NaLuF4:Gd, Yb, Tm upconversion nanocrystals as the core, a media shell of SiO2, and a lot of small sized anatase TiO2 nanoparticles as the outer shell. The TiO2 shell is modified by Mo-doping, which can narrow the band-gap of TiO2 and act as an electron trap, resulting in enhancement of light absorption and reduction of the recombination rate of the photogenerated carriers. The upconversion nanocrystals can convert NIR into UV and visible light which is overall absorbed by the modified TiO2 shell. The photocatalytic activities of the prepared products are evaluated through photocatalytic degradation of RhB under the irradiation of simulated solar and NIR light. The results show that the as-prepared nanocomposite displays a high photocatalytic activity which is significantly higher than that of commercial P25 and pure TiO2. This work provides new insights into the fabrication of TiO2-based composites as high performance photocatalysts and facilitates their application in environmental protection issues using solar light.

机译：首次开发了新型的双壳结构β-NaLuF4：Gd，Yb，Tm @ SiO2 @ TiO2：Mo纳米复合光催化剂。纳米复合材料由均匀的b-NaLuF4：Gd，Yb，Tm上转换纳米晶体为核，SiO2的介质壳和大量的小尺寸锐钛矿型TiO2纳米颗粒为外壳。 TiO2壳通过Mo掺杂改性，可以缩小TiO2的带隙并充当电子陷阱，从而提高了光吸收率并降低了光生载流子的复合率。上转换纳米晶体可以将NIR转换为UV和可见光，这些光被改性TiO2壳吸收。通过在模拟太阳光和近红外光的照射下RhB的光催化降解来评估所制备产品的光催化活性。结果表明，所制备的纳米复合材料显示出高的光催化活性，其显着高于市售的P25和纯TiO2。这项工作为制造基于TiO2的复合材料作为高性能光催化剂提供了新的见识，并促进了它们在使用太阳光的环境保护问题中的应用。

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《RSC Advances》 |2015年第106期|共8页
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Yin Dongguang; Zhang Lu; Cao Xianzhang; Tang Jingxiu; Huang Wenfeng; Han Yanlin; Liu Yumin; Zhang Tingting; Wu Minghong;
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1. Improving photocatalytic activity by combining upconversion nanocrystals and Mo-doping: a case study on beta-NaLuF4:Gd,Yb,Tm@SiO2@TiO2:Mo [J] . Yin Dongguang, Zhang Lu, Cao Xianzhang, RSC Advances . 2015,第106期

机译：通过结合上转换纳米晶体和Mo掺杂提高光催化活性：以β-NaLuF4：Gd，Yb，Tm @ SiO2 @ TiO2：Mo为例
2. Multiband Monte Carlo modeling of upconversion emission in sub 10 nm beta-NaGdF4:Yb3+, Er3+ nanocrystals-Effect of Yb3+ content [J] . Pawlik G., Niczyj J., Noculak A., The Journal of Chemical Physics . 2017,第24期

机译：亚10NMβ-NAGDF4中的上转换发射的多频带蒙特卡罗建模：YB3 +，ER3 +纳米晶体 - YB3 +含量的效果
3. Preparation of NaYF_4: Gd~(3+), Yb~(3+), Tm~(3+) @ TiO_2 and NaYF_4: Gd~(3+), Yb~(3+), Tm~(3+) @ TiO_2 @ Au nanocomposites and their upconversion and photocatalytic properties under simulated solar light with or without an UV filter [J] . Shuwang Duo, Cuiping Zhong, JieJun Zhang, Journal of materials science . 2018,第4期

机译：NaYF_4的制备：Gd〜（3+），Yb〜（3+），Tm〜（3+）@ TiO_2和NaYF_4：Gd〜（3+），Yb〜（3+），Tm〜（3+）@带有或不带有紫外线滤光片的模拟太阳光下TiO_2 @ Au纳米复合材料及其上转换和光催化性能
4. Gd~(3+) and S~(2+) sensitizer effect on the upconversion emission of ZrO_2:Yb~(3+), Er~(3+) nanocrystals prepared by precipitation method with a hydrothermal process [C] . Alejandra Urbina-Frias, Elder De la Rosa, Tzarara Lopez-Luke, Nanophotonic materials VIII . 2011

机译：Gd〜（3+）和S〜（2+）敏化剂对水热沉淀法制备的ZrO_2：Yb〜（3 +），Er〜（3+）纳米晶体上转换发射的影响
5. Rate Equations Modeling of Upconversion Dynamics in Er, Yb and Tm, Yb doped β-NaYF4 Nanophosphors [D] . Hossan, Md Yeathad. 2019

机译：ER，Yb和Tm，Yb掺杂β-Nayf4纳米膦术中升高动态的速率方程建模
6. Fabrication of Er3+/Yb3+ Co-Doped Bi5O7I Microsphere With Upconversion Luminescence and Enhanced Photocatalytic Activity for Bisphenol A Degradation [O] . Baowei Cao, Siwen Gong, Siyaka Mj Zubairu, 2020

机译：ER3 + / YB3 +共掺杂BI507I微球的制备具有上转化发光和增强的双酚的光催化活性降解
7. Fine-tuning of multiple upconversion emissions by controlling the crystal phase and morphology between GdF3:Yb3+,Tm3+ and GdOF:Yb3+,Tm3+ nanocrystals [O] . Yongsheng Zhu, Dongqin Bi, Huiqiao Wang, 2017

机译：通过控制GDF3：YB3 +，TM3 +和GDOF之间的晶相和形态来微调多重升级排放：YB3 +，TM3 +纳米晶体

Improving photocatalytic activity by combining upconversion nanocrystals and Mo-doping: a case study on beta-NaLuF4:Gd,Yb,Tm@SiO2@TiO2:Mo

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