APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Tianyi Zhang,Da Teng,Jiaojiao Zhang,Zihui Meng,Lili Qiu
The unique periodic structure of photonic crystals demonstrates an effective slow photon effect that enhances the interaction between light and matter. This study designed and prepared MOF photonic crystal beads, and significantly improved the photocatalytic efficiency by utilizing the slow light effect. Utilizing microfluidic technology, ZIF-8 was self-assembled to form photonic crystal beads (PCB-Z) to enhance adsorption properties and light absorption. The surface of PCB-Z is modified with CdS to form a heterostructure (PCB-ZC), which widens the absorption spectrum, reduces the carrier recombination rate, and increases the specific surface area, while the photocurrent intensity of PCB-ZC is about 1.8 and 29 times that of CdS and PCB-Z. Under the combined effect of photonic crystal structure, ZIF-8/CdS heterojunction and slow photon effect, the degradation rate of Rhodamine B by PCB-ZC was 15.22 times higher than the disordered ZIF-8 powder, and the photocatalytic performance was significantly improved. The dominant role of holes in Rhodamine B degradation was confirmed by free radical trapping experiments and EPR tests. This research confirms that MOF-based photonic crystals can be assembled into periodic structures to enhance adsorption properties and light absorption, which provides a new paradigm for the development of MOF-based photocatalysts.
研究领域:
材料科学
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光化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
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2018
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IF 3.789
Xiaojie Wu,Dengpeng Lan,Ruifang Zhang,Fei Pang,Jianping Ge
Monodisperse ZnO particles with adjustable size have been produced on a large scale by two-step seeding-growth polyol reactions. Through spin coating of supersaturated ZnO/diethylene glycol solution and evaporation of solvent, opaline ZnO photonic crystal (PC) film with good crystallinity and uniform photonic structures can be prepared from these ZnO particles. Compared with a disorderly stacked ZnO film, the ZnO PC film shows a higher activity in photocatalytic reduction of CO2 due to the generated slow photons at the edge of the photonic band gap and their promotion to the light absorption. When the electronic band gap of ZnO matches the red edge of the photonic band gap of ZnO PC, the enhancement factor of photocatalytic activity represented by CO evolution can be maximized to 2.64-fold in the current experiment. Compared to the traditional inverse opal photocatalysts, the opaline ZnO photocatalysts are prepared by simplified and scalable procedures, and they still possess the same enhancement in activity compared to ZnO without the photonic structure, which might be broadly used in solar energy utilization, environment protection, and many other green chemical processes in the future.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiaojiao Zhang,Tianyi Zhang,Da Teng,Zihui Meng,Lili Qiu
Photocatalytic oxidation technology using solar energy is an effective strategy to solve environmental pollution and energy shortage. To avoid angle dependence of traditional photonic crystal photocatalysts and address the limitations of high charge recombination rate and low light utilization of TiO 2 , this study proposed a novel inverse opal TiO 2 /CdS photonic crystal beads (IO TiO 2 /CdS PCBs) photocatalyst. By leveraging the synergistic coupling of PCBs’ slow light effect and TiO 2 /CdS heterojunction, the photocatalytic activity was significantly enhanced. The results revealed that the PCBs matching the blue edge with TiO 2 ′s electronic band gap (IO TiO 2 -140 PCBs) exhibited the highest apparent rate constant of 0.01901 min −1 . By introducing CdS to form a heterojunction with TiO 2 , the photocatalytic performance was further improved by effectively inhibiting the recombination of photogenerated carriers. The degradation rate of RhB reached 96.6 % in 60 min, outperforming that of IO TiO 2 at 65.1 %, with the rate constant increasing by 3.1 times. Electron spin resonance and trapping experiments indicated that h + was the main active specie, and the possible reaction mechanism path was proposed. The combination of “extrinsic” modifications by doping CdS and “self-structural” modifications by shaping TiO 2 into periodic IO PCBs structure provided a systematic insight on the design of novel photocatalysts.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Wenxue Gong,Xuechun Wei,Yanhu Han,Sidra Subhan,Xin Yu,Tianjian Ji,Wenqing Sun,Yuming Zhang,Zhongfeng Shi,Zhenxia Zhao,Zhongxing Zhao
Herein, ZnO based materials are modified to narrow the photonic band gap, improved utilization rate of visible light and recombination efficiency of photoexcited carriers for the photocatalytic degradation of tetracycline hydrochloride (TCH). For this purpose, a photonic crystal (PC) heterojunction was constructed comprising of nitrogen (N) doped cadmium sulfide (CdS) coupled with ZnO (CdS-N/ZnO) via sacrificial template and multilayer in-situ deposition methods. The constructed PC junction acted as photocatalyst for the effective degradation of TCH under visible light by synergistically promoting the separation efficiency of electron-hole pairs, narrowing the band gap and broadening the light absorption spectrum of ZnO. Moreover, a slow light effect was achieved by adjusting the band gap of the PC overlapped with the wavelength of incident light, which finally enhanced the light harvesting performance of the CdS-N/ZnO photocatalyst. The optimized PC CdS-N/ZnO composites exhibited efficient TCH removal rate of 97.0 % in 90 min and kb as 4.00–15.17 times that of other reported catalysts. Moreover, PC CdS-N/ZnO catalyst achieved 45.2 % mineralization rates reached in 120 min with high stability and reusability for six cycles. HPLC-MS method was used for monitoring the intermediates of TCH degradation, and also analyzing the possible pathways of products. In addition, the toxicity of TCH and its intermediates were also investigated, which showed that the toxicity has effectively been alleviated. The photocatalytic mechanism endowed that ·O 2 – and h + are the major active free radicals in the photocatalytic degradation process, and the electron transport path is type Ⅱ heterostructure. This work will thus envisage a novel vision of designing ZnO photocatalysts for the antibiotic degradation in the practical application of wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Hui Wang,Xiaodong Chen,Ge Xie,Duohang Bi,Shuo Du,Miaomiao Li,Lianbin Zhang,Jintao Zhu
Photodynamic therapy is promising for combating bacteria by reactive oxygen species. However, the therapeutic efficiency of photodynamic antibacterial therapy (PDAT) is largely hindered by limited photon absorption and the low quantum yield of photosensitizers. Herein, a novel light-harvesting platform is designed by decorating photosensitizer chlorine e6 (Ce6) into an inverse opal photonic hydrogel (Ce6/IOPG) framework for efficient light utilization to enhance PDAT. It is shown that the generating efficiency of singlet oxygen ( 1 O 2 ) can be tuned by the relative positions of the photonic bandgap (PBG) of IOPG and the absorption band of Ce6. The coupling of the slow photon effect with the efficient dispersion of Ce6 allows for a maximum generation of 1 O 2 of approximately 69.5-fold and markedly enhances PDAT activity upon low light irradiation when the blue edge of PBG overlaps with the absorption band of Ce6. Particularly, slow photons at the blue edge show advantages in improving 1 O 2 generation compared to those at the red edge. The variation in 1 O 2 generation by altering the incident angle of light provides direct evidence for the slow photon effect in Ce6/IOPG. This work provides insights into blue-edge slow photons in photodynamic enhancement and offers an advisable design principle for efficient antibacterial therapy.
研究领域:
材料科学
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生物医学工程
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光子学
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治疗学
✓ 已验证
产品关联
DOI
高影响因子
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