CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 1
·120-126
·
IF 1.063
Chen Jianfei,Chen Xiaoyu,Zhang Xing,Yuan Yao,Bi Ruyi,You Feifei,Wang Zumin,Yu Ranbo
BiVO 4 , a promising visible-light responding photocatalyst, has aroused extensive research interest because of inexpensiveness and excellent chemical stability. However, its main drawback is the poor photoinduced charge-transfer dynamics. Building nanostructures is an effective way to tackle this problem. Herein, we put forward a new method to prepare nanostructured BiVO 4 from Bi-based metal-organic frameworks[Bi-MOF(CAU-17)] precursor. The as-prepared material has a rod-like morphology inherited from the Bi-MOF sacrificial template and consists of small nanoparticle as building blocks. Compared with its counterparts prepared by conventional methods, MOF-derived nanostructured BiVO 4 shows better light absorption ability, narrower bandgap, and improved electrical conductivity as well as reduced recombination. Consequently, BiVO 4 nanostructure demonstrates high photocatalytic activity under visible light towards the degradation of methylene blue. Methylene blue can be degraded up to 90% within 30 min with a reaction rate constant of 0.058 min −1 . Moreover, the cycling stability of the catalyst is excellent to withstand unchanged degradation efficiency for at least 5 cycles.
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ACS Omega
·
2019
·
IF 2.584
Wenda Zhang,Weidong Zhuang,Ronghui Liu,Xianran Xing,Xiangwei Qu,Haochen Liu,Bing Xu,Kai Wang,Xiao Wei Sun
Traditionally, ZnS or ZnSe is chosen as the shell material for InP quantum dots (QDs). However, for green or blue InP QDs, the ZnSe shell will form a type-II structure resulting in a redshift of the emission spectrum. Although the band gap of ZnS is wider, its lattice mismatch with InP is larger (∼7.7%), resulting in more defect states and lowered quantum yield (QY). To overcome the above problems, we introduced the intermediate ZnMnS layer in InP/ZnMnS/ZnS QDs. The wide band gap of the intermediate layer (3.7 eV) can confine the electrons and holes in the core completely, and the formation of the type-II structure is avoided. As a result, green InP-based QDs with QY up to 80% were obtained. By adjusting the halogen ratios of the ZnX2 precursor, the minimum and maximum emission peaks are 470 and 620 nm, respectively, covering the whole visible range. Finally, after optimizing the coating shell process, the maximum external quantum efficiency of QD light-emitting diodes fabricated from this InP-based green light QDs can reach 2.7%.
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Advanced Materials Interfaces
·
2019
·Vol. 6
·期 4
·1801965
·
IF 4.713
Yunyu Sun,Ye Liu,Bo Song,Hui Zhang,Ruomeng Duan,Dafeng Zhang,Bin Dong
Micromotor that exhibits various movement behaviors has attracted more attention in recent years. However, most researchers focus on its motion behavior and few have studied the fluid flow surrounding it. In this work, a novel micromotor with both controlled motion behavior and surrounding fluid flow, which is driven by near-infrared (NIR) light based on the unique Marangoni effect caused by the light irradiation of its constituent, i.e., polypyrrole (PPy), is reported. Interestingly, these motion behaviors and the surrounding fluid flow can be easily switched by adjusting the incident angle of the NIR laser. This unique property may have potentials in different fields. Among others, its application in remotely controlled targeted delivery and release is demonstrated.
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ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Xiqing Liu,Zhiping Zhou,Yang Lu,Tao Wang,Pengwei Huo,Yongsheng Yan
In this work, a simple method to prepare defect two-dimension (2D) Bi 4 Ti 3 O 12 nanosheets material by NaBH 4 reduction with Argon atmosphere was reported. The results of EPR and XPS demonstrated that the presence of oxygen vacancy in Bi 4 Ti 3 O 12 , which resulted in color changed and extend photon-absorbance. By comparing to pristine Bi 4 Ti 3 O 12 , the black Bi 4 Ti 3 O 12 exhibited higher photocatalytic activity to pollutants. The mechanism was also proposed for exploring the defect in the photocatalytic process.
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ACS Applied Nano Materials
·
2019
·
IF 0
Peng Du,Weiguang Ran,Yafei Hou,Laihui Luo,Weiping Li
The Eu3+-activated NaGdF4 nanorods were achieved through a simple precipitation procedure at ambient temperature. With the irradiation at 396 nm, the designed nanorods exhibited visible red light with admirable color purity of 90.5% and the optimal doping concentration was 50 mol %. The concentration quenching mechanism was revealed to be decided by dipole–quadrupole interaction and the critical distance was 11.14 Å. The optical transition parameters, which were estimated from Judd-Ofelt theory, of the Eu3+ ions were obtained to confirm its local symmetry behaviors. Moreover, the emission spectra of the designed nanorods at diverse temperatures were used to identify its thermal quenching performance. In comparison with that of the Y2O3:Eu3+ compound, the emission intensity of the Eu3+-activated NaGdF4 nanorods with optimum doping content was 2.47 times higher and its internal quantum efficiency was around 62.3%. Furthermore, the developed white light-emitting diode device, which was constructed by resultant nanorods, green-emitting phosphor (i.e., (Ba,Sr)2SiO4:Eu2+), blue-emitting phosphor (i.e., BaMgAl10O17:Eu2+), and a near-ultraviolet chip, exhibited admirable colorific properties (i.e., good color coordinates, low correlated color temperature, high color rendering index). These achieved features implied that the NaGdF4 nanorods doped with Eu3+ ions were sutiable red-emitting platforms for indoor illumination.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yunfan Lin,Donglin Han,Yuan Li,Lei Tan,Xiangmei Liu,Zhenduo Cui,Xianjin Yang,Zhaoyang Li,Yanqin Liang,Shengli Zhu,Shuilin Wu
On a global scale, bacterial infection has become a huge threat to human health. Taking into consideration the increasing drug-resistance bacteria, it is urgent to develop novel nonantibiotics strategies to kill bacteria rapidly. Herein, Ag2S@WS2 was developed as a new kind of antibacterial agent, where exfoliated WS2 nanosheets were decorated with Ag2S nanoparticles through in situ growth. Under near-infrared (NIR) light irradiation (808 nm), the tight contact between Ag2S and WS2 endowed the composite with outstanding photocatalytic property, which was attributed to effective separation of photoactivated electronics and holes. Because of the synergistic effect of photocatalytic and photothermal properties, highly effective antibacterial efficacy could be achieved for Ag2S@WS2 within 20 min NIR light irradiation, that is, 99.93% toward Staphylococcus aureus and 99.84% toward Escherichia coli. Moreover, the in vitro cell culture test showed that the synthesized Ag2S@WS2 was noncytotoxic. These results demonstrate that Ag2S@WS2 can be a promising material for rapid and highly effective disinfection under NIR irradiation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Ying Wang,Na Bi,Hao Zhang,Wen Tian,Tao Zhang,Pan Wu,Wei Jiang
In this study, a photocatalysis-assisted adsorption process was proposed to remove a typical azo dye , Congo red (CR), from wastewater, using Ag 2 O. The organic dyes were adsorbed using Ag 2 O, and photodegraded in situ under visible light irradiation, thus, eliminating the desorption step. The results indicated that the maximal adsorption capacity of Ag 2 O for CR reached 180.8 mg/g at the initial CR concentration of 300 mg/L and pH 7. The adsorption of CR could be described using the Langmuir equation, and obeyed the pseudo-second-order kinetic expression. The CR adsorbed by Ag 2 O was completely photodegraded in 35 min to regenerate the Ag 2 O adsorbent under visible light irradiation, and only a slight decrease in the performance of Ag 2 O was observed after four cycles. This photocatalysis-assisted adsorption process could be extended to other azo dyes including acid orange 7 and amido black 10B , but could not be applied to non-azo dyes such as rhodamine B and methylene blue . This adsorption behavior difference was ascribed to the similar molecular orbital structures of Ag 2 O and azo dyes.
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Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Junlei Zhang,Zhen Ma
Novel Ag-Ag 2 CO 3 /Bi 2 MoO 6 composites were obtained through in situ formation of Ag 2 CO 3 rods/nanoparticles onto Bi 2 MoO 6 nanosheets, followed by photoreduction. These composites were found to be much more active than Bi 2 MoO 6 in photocatalytic degradation of rhodamine B (RhB) under visible-light irradiation. In particular, an Ag-Ag 2 CO 3 /Bi 2 MoO 6 composite with a theoretical Ag 2 CO 3 /Bi 2 MoO 6 mass ratio of ∼27.5% exhibited the highest photocatalytic activity. It was also the most active in photocatalytic degradation of methyl blue (MB) and tetracycline hydrochloride (TC), due to the enhanced visible-light absorption and efficient separation of photogenerated carriers. The good reusability of Ag-Ag 2 CO 3 /Bi 2 MoO 6 was verified by cycling degradation experiments. The dominant active species were found to be photogenerated holes (h + ). A possible photocatalytic mechanism was proposed.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jun Wan,Baihong An,Zhibeng Chen,Jingwei Zhang,William W. Yu
Nitrogen doped graphene oxide (NG) modified WSe 2 nanorod composites (WSe 2 /NG) were prepared by a hydrothermal synthesis route. The synthesized samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy(DRS) and elemental analysis . Using methylene blue (MB) as a target organic dye, WSe 2 /NG nanocomposites exhibited significant enhancement in photocatalytic degradation of MB under visible light irradiation compared with WSe 2 . That was mainly attributed to the strong adsorption of MB, excellent electrical conductivity and charge separation features of the NG, leading to effectively restrained electron-hole pair recombination of WSe 2 nanorods. Among the hybrid photocatalysts , WSe 2 /50NG (50 wt% of NG) exhibited the highest photocatalytic activity with a rate constant of 0.0572 min −1 for the degradation of the MB in aqueous solution under visible light irradiation, and the removal efficiency reached 99.3% which was 2.4 times higher than that of WSe 2 . In addition, WSe 2 /NG also showed higher stability and good reusability.
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Journal of Materials Chemistry B
·
2018
·Vol. 7
·期 3
·460-468
·
IF 4.776
Yu Chen,Yujie Gao,Yuce Li,Ke Wang,Jintao Zhu
The combination of chemotherapy and photodynamic therapy (PDT) using polymeric nanocarriers is effective for improving therapeutic efficiency against cancer. Yet, in most reported cases, due to the lack of synergistic mechanisms, chemotherapy and PDT work independently rather than synergistically—the functions of chemotherapeutic drugs and photosensitizers in nanocarriers are independent when they are delivered to cancer cells. Here, we demonstrate the construction of reactive oxygen species (ROS)-degradable nanoparticles (NPs) based on phenylboronic pinacol ester-conjugated dextran (PPE–Dex) through a membrane-extrusion emulsification approach for the co-delivery of anticancer drug (e.g., doxorubicin, Dox) and photosensitizer (e.g., chlorin e6, Ce6). When exposed to 655 nm laser irradiation, ROS generated by encapsulated Ce6 not only induced a significant PDT effect in cancer cells, but also triggered the rapid oxidization and degradation of PPE–Dex, resulting in the quick release and enhanced intra-nuclei accumulation of Dox. In vitro cytotoxicity and combination index (CI) assay indicated that the PPE–Dex NPs offered remarkable synergistic therapeutic effects of Dox and Ce6 against cancer cells under irradiation. Furthermore, the drug release profiles can be well regulated by changing the irradiation time to satisfy different demands in various treatment programs. Our results demonstrated that such ROS-degradable polymeric NPs with light-activated disassembly capability are promising carriers for synergistic photodynamic–chemo therapy in cancer therapy.
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Nano Research
·
2018
·Vol. 11
·期 10
·5657-5669
·
IF 7.994
Chen Qian,Chen Jiawen,Yang Zhijuan,Zhang Lin,Dong Ziliang,Liu Zhuang
The use of near-infrared (NIR) light for photodynamic therapy (PDT) is a promising strategy to circumvent the limitations of current PDT, in which visible light with limited tissue penetration depth is usually used. In the present study, alkyl thiolated gold nanoclusters (AuNCs) were co-modified with human serum albumin (HSA) and catalase (CAT), and then employed as a multifunctional, optical, theranostic nano-agent. In the AuNC@HSA/CAT system, the AuNCs were able to produce singlet oxygen under excitation by a 1,064-nm laser, which locates in the second NIR window (NIR-II), and featured much lower tissue absorption and scattering, enabling NIR-II-triggered PDT. The HSA coating greatly improved the physiological stability of the nanoparticles, which showed efficient tumor retention after intravenous injection, as revealed by detecting the AuNC fluorescence. Moreover, the presence of CAT in the nanoparticles triggered decomposition of tumor endogenous H 2 O 2 to generate oxygen, thereby enhancing the efficacy of PDT by relieving tumor hypoxia. Compared with conventional PDT using visible light, NIR-II-triggered PDT exhibits remarkably increased tissue penetration. Thus, we developed a new type of photosensitizing nano-agent that simultaneously enables in vivo fluorescence imaging, tumor hypoxia relief, and NIR-II light-induced in vivo PDT in the treatment of cancer.
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Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 23
·3644-3651
·
IF 5.047
Yujie Gao,Hongyao Du,Zhanjun Xie,Miaomiao Li,Jinjin Zhu,Jingwei Xu,Lianbin Zhang,Juan Tao,Jintao Zhu
Hydrogel-based dressings can provide a moist environment for wounds, and have been proven to be beneficial for wound healing. However, preparation of effective hydrogel dressings in a facile yet robust manner still remains a big challenge. Herein, a photo-initiated polymerization method is employed to develop a photothermal hydrogel film with self-adhesive properties for accelerated wound healing under solar light irradiation. Such a hydrogel film is obtained by taking advantage of the excellent adhesion of bioinspired polydopamine (PDA) and the great photothermal conversion capability of reduced graphene oxide (rGO) upon solar light irradiation. The formed photothermal hydrogel film could adhere to wounds and convert solar light into heat, warming up the wound locally. The localized temperature enhancement significantly promotes wound healing by reducing the inflammatory response, and enhancing re-epithelialization, angiogenesis, and collagen deposition, presumably correlated with the increased expressions of transforming growth factor-β1 (TGF-β1) and vascular endothelial growth factor-A (VEGF-A). This finding demonstrates the great potential of the photothermal hydrogel film for wound healing in clinical or daily applications.
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