Catalysis Science & Technology
·
2019
·Vol. 9
·期 9
·2103-2110
·
IF 5.726
Shuhui Liang,Yukun Chang,Yue Wang,Dafeng Zhang,Xipeng Pu
A simple combustion method was reported to prepare a novel BiOBr:Yb3+,Er3+/AgBr (BYE/AgBr) heterojunction photocatalyst. Phase composition, morphology and optical properties of samples were characterized. The diffuse reflectance and photoluminescence spectra showed that the as-synthesized BYE/AgBr can be activated under both visible (vis) and near-infrared (NIR) light. Notably, BYE/AgBr composites exhibited enhanced photocatalytic activity for RhB degradation under vis/NIR irradiation. The degradation rate constants of BYE/AgBr-1 : 1.5 for RhB were 0.0220 min−1 and 0.01368 h−1 under visible and NIR irradiation, which are about 2.6 and 4.9 times higher than that of pure BYE, respectively. The upconversion effect of Er3+ can convert the NIR light (∼980 nm) to visible light which was then absorbed by BYE/AgBr to generate e− and h+. Moreover, the formation of the heterojunction also plays a role in the enhanced vis/NIR photocatalytic abilities; and a corresponding plausible photocatalytic mechanism was proposed.
研究领域:
材料科学
·
光催化
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Junhao Ma,Yubin Wei,Tong Liu,Liang Xu,Tianhui Wang,Zhiguo Song,Jianbei Qiu,Yongjin Li
Lanthanide-doped upconversion (UC) materials are important in near-infrared (NIR) photocatalytic field because they can harvest NIR photons and then emit high-energy UV and visible light via the UC process. However, these materials still exhibit low UC luminescence efficiency, which strongly limits their practical applications. Herein, we report UC luminescence enhancement in BiOBr: Yb 3+ , Er 3+ (BYE) nanosheets by doping Li + and Zn 2+ and the elucidation of the enhancement mechanism. The XRD and Rietveld refinement results showed that the doping improved the crystallinity of the samples, with the effect of codoping being more pronounced than that of single doping. Under 980-nm laser excitation, the red emission of the Li + -Zn 2+ -codoped BYE sample increased drastically by 2.5, 4.3, and 5.3 times than that of the Li + -doped BYE, Zn 2+ -doped BYE, and BYE samples, respectively. The luminescence enhancement could be ascribed to the reduction of the crystal site symmetry and the improvement of the crystallinity upon Li + and Zn 2+ doping. Moreover, photocatalytic experiments showed that Li + and Zn 2+ doped BYE exhibited better photocatalytic performance than BYE, thus paving the way toward achieving enhanced UC luminescence efficiency.
研究领域:
材料科学
·
光学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shuhui Liang,Manman He,Jingjing Guo,Jie Yue,Xipeng Pu,Bo Ge,Wenzhi Li
The BiOBr:Yb 3+ ,Er 3+ /g-C 3 N 4 (BYE/CN) p-n junction photocatalysts were successfully fabricated by a stepwise method. Experimental results show that Er 3+ /Yb 3+ were successfully doped into BiOBr lattice. As-obtained BYE/CN exhibited strong NIR light absorption and upconversion emission from NIR to UV–visible due to the upconversion transition of Er 3+ . The p-n junction was constructed due to the appropriate alignment band structure of BYE and g-C 3 N 4 , which distinctly suppresses the recombination rate of electron-hole pairs. Compared with pure BYE and CN, as-synthesized BYE/CN samples exhibit distinctly improved photoactivities under the irradiation of visible or NIR light, which can be attributed to the upconversion effect of Er 3+ and the construction of p-n junction. This result may provides a promising system for efficient harvest of the NIR light, which will contribute to the utilization of solar energy in the future.
研究领域:
材料科学
·
光催化
·
能源利用
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xintong Yao,Xue Jiang,Dafeng Zhang,Shuya Lu,Mengyao Wang,Sihan Pan,Xipeng Pu,Junchang Liu,Peiqing Cai
The key to obtain effective photocatalysts is to increase the efficiency of light energy conversion, and thus the design and implementation of full-spectrum photocatalysts is a potential approach to solve this problem especially by extending the absorption range to near-infrared (NIR) light. Herein, the improved full-spectrum responsive CuWO 4 /BiOBr:Yb 3+ ,Er 3+ (CW/BYE) direct Z-scheme heterojunction was prepared. The CW/BYE with CW mass ratio of 5% had the best degradation performance, and the removal rate of tetracycline reached 93.9% in 60 min and 69.4% in 12 h under visible (Vis) and NIR light, respectively, which were 5.2 and 3.3 times of BYE. According to the outcome of experimental, the reasonable mechanism of improved photoactivity was put forward on the basis of (i) the up-conversion (UC) effect of Er 3+ ion to convert NIR photon to ultraviolet or visible light, which can be used by CW and BYE, (ii) the photothermal effect of CW to absorb the NIR light, increasing the local temperature of photocatalyst particle to accelerate the photoreaction, and (iii) the formed direct Z-scheme heterojunction between BYE and CW to boost the separation of photogenerated electron-hole pairs. Additionally, the excellent photostability of the photocatalyst was verified by cycle degradation experiments. This work opens up a promising technique for designing and synthesizing full-spectrum photocatalysts by utilizing synergetic effects of UC, photothermal effect and direct Z-scheme heterojunction.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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