Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 29
·9996-10003
·
IF 6.4
Xudong Jin,Yanqin Miao,Jianhua Dong,Jingkun Wang,Qiqing Lu,Min Zhao,Bingshe Xu,Junjie Guo
The room-temperature triple-ligand surface engineering strategy demonstrates the advantages of low-cost and high-yield in the preparation of perovskite nanocrystals (PeNCs). However, conventional octanoic acid (OTAc) with short-chain length shows weak binding energy with Pb2+, resulting in higher trap states density and inferior stability of PeNCs. Here, we prepare CsPbBr3 PeNCs capped with 4-dodecylbenzene sulfonic acid (DBSA) to maintain lower trap states density, a higher photoluminescence quantum yield of 91%, larger yield production and better stability compared to OTAc-PeNCs. Consequently, DBSA-PeNCs based PeLEDs with a peak external quantum efficiency (EQE) of 8.95% and a maximum luminance of 4452 cd m−2 are achieved, which constitute about 3-fold and 2-fold enhancement compared to OTAc-PeNCs based PeLEDs, respectively. These results demonstrate that introducing DBSA as the surface ligand is an effective way to realize highly efficient PeLEDs.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Keheng Pan,Xin Tang,Guangfei Qu,Huimin Tang,Kunling Wei,Jiaxin Lv
The detrimental effects of anthropogenic heavy metal pollution on the environment have recently become a pressing concern, with Pb2+ ions emerging as a particularly hazardous pollutant. In this paper, we report the synthesis and characterization of light-driven mesoporous silica-IP (iron phthalocyanine) nanomaterials that exhibit remarkable efficiency and selectivity in the removal of Pb2+ ions from wastewater. The fibrous structure of the material provides a large specific surface area and adsorption sites, enabling it to achieve a theoretical maximum adsorption capacity of 69.78 mg/g. In addition, our studies of the adsorption effect of actual wastewater showed a significant reduction in the concentration of Pb2+ ions to 1.76 mg/L, indicating the excellent effectiveness of the material in treating contaminated water sources. In addition, the photosensitive material on the surface of the material provides reliable light-driving capability, enabling rapid separation of Pb2+ ions from wastewater with a maximum movement speed of 26 μm/s.
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Catalysts
·
2023
·Vol. 13
·期 7
·1073
·
IF 3.9
Kaiwen Yuan,Bo Gong,Chundong Peng,Yanmei Feng,Yingmo Hu,Kai Chen,Daimei Chen,Derek Hao
Cr(VI) is a common heavy metal pollutants present in the aquatic environment, which possess toxic and carcinogenic properties. In this study, a solvothermal reaction was used to prepare porphyrin (TCPP)-modified UiO-66-NH2(UNT). The UNT integrated adsorption and photocatalytics in the application for dealing with Cr(VI). The photocatalytic reduction activities of UNT for Cr(VI) were investigated under visible light illumination. We found that the TCPP doping amount of 15 mg UNT (15-UNT) had a 10 times higher reduction rate of Cr(VI) than pristine UiO-66-NH2. The optimal 15-UNT photocatalyst demonstrated the highest photocatalytic activity, and Cr(VI) was completely removed within 80 min. In addition, the introduction of porphyrin not only enhanced the absorption of light but also enabled the transport of photogenerated electrons from porphyrin to UiO-66-NH2, which promoted the separation of charge carriers. Furthermore, the effects of factors such as porphyrin content, pH and light source on the photocatalytic reduction performances of UNT were also explored. Overall, this work presented a possible relationship between the crystal structures and the performance of UNT.Keywords:photocatalytic reduction;porphyrin;UiO-66-NH2;hexavalent chromium
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Chemosensors
·
2023
·Vol. 11
·期 8
·453
·
IF 4.2
Kai Mao,Lili Tian,Yujie Luo,Qian Li,Xi Chen,Lei Zhan,Yuanfang Li,Chengzhi Huang,Shujun Zhen
Enzyme-linked immunosorbent assay (ELISA) is one of the most commonly used method for the detection of staphylococcal enterotoxin B (SEB), the main protein toxin causing staphylococcal food poisoning. However, the traditional ELISA reaction needs to be stopped by sulfuric acid to obtain stable colorimetric signal, and it is easily influenced by a colored sample. In order to address this problem, a new ELISA method using zeolite imidazolate skeleton-8 metal-organic framework (ZIF-8 MOF) as a light scattering (LS) reporter for SEB detection was developed in this work. ZIF-8 MOF has the characteristics of high porosity, large specific surface area, clear pore structure, and adjustable size, which is one of the most representative MOFs constructed from Zn2+and 2-methylimidazole (2-mIM). The 2-mIM ligand of ZIF-8 exhibited antioxidant activity and can strongly react with H2O2, which could destroy the structure of ZIF-8, resulting in the obvious decrease in LS intensity. We combined this specific reaction with the sandwich immune reaction to construct the LS ELISA method for the successful detection of SEB. This method is more reliable than commercial tests kits for the detection of colored samples, and it is simple, sensitive, and selective, and has great potential in the detection of other toxins by simply changing the corresponding recognition units.Keywords:ELISA;light scattering;metal organic framework;ZIF-8;staphylococcal enterotoxin B
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DYES AND PIGMENTS
·
2023
·
IF 4.5
Xuanqi Hao,Qiaoyu Yang,Chenchen Liu,Ping Yang
It is still a challenge for multicolor carbon dots (CDs) with stable and bright photoluminescence (PL). The controlling of synthesis becomes a hot topic. In this paper, CDs with blue-, green- and red-emitting named as B-CDs, G-CDs, and R-CDs were prepared using three isomers of phenylenediamine as precursors by one-step solvothermal synthesis . Green and red emitting CDs with C, N and O components named as samples G-CDs and R-CDs revealed uniform nanoparticle distribution with average sizes of 7.2 and 5.7 nm, respectively. The PL peak wavelength of three kinds of CDs were 430, 546 and 613 nm, and their average fluorescence lifetime was 5.32, 22.35, 8.74 ns, respectively. The full width at half maximum of PL spectra of the samples was 65.12, 92.63, 83.62 nm, and their PL quantum yields were 8.19, 43.43, and 5.14%, respectively. The brightly luminescent CDs were further embedded in prepared polyvinyl alcohol films to prepare a white emitting layer by adjusting the ratios of CDs with different emitting color. The composite CDs revealed stable and bright white emitting in the film with a Commission Internationale d'Eclairage (CIE) coordinate of (0.28, 0.33). The result suggested that these unique luminescent CDs have potential applications in various luminescence fields.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 10
·4257-4274
·
IF 3.3
Cao Wenbo,Ren Haitao,Cai Chaochen,Li Dashuai,Li Tingting,Lou Chingwen,Lin Jiahorng
Photocatalysis is a promising technology for wastewater treatment. It is a key problem to develop photocatalytic materials that can efficiently remove tetracycline (TC) under weak light intensity. This article synthesized the UiO-66-NH 2 /Bi 2.15 WO 6 heterojunction using a solvothermal method, and its specific surface area increases by 2.1 times relative to Bi 2.15 WO 6 , endowing good adsorption capacity for TC. Compared with Bi 2.15 WO 6 , the heterojunction effectively improves the separation of electrons and holes and enhances the photocatalytic performance. Under weak light intensity (4 mW cm −2 ), the removal percentage of 50 mg L −1 TC can reach 78.0%, attributing to a synergistic effect between adsorption and photocatalysis. The free radical capture experiment showed that TC was photodegradation mainly under the action of hole (h + ) and superoxide radical (·O 2 − ). Finally, through LC/MS analysis, it is inferred that TC is degraded into H 2 O and CO 2 after a series of reactions such as deamination, dehydroxylation, amide bond breaking and ring opening. This study provides insights for the synthesis of more powerful photocatalysts for TC removal.
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International Journal of Green Energy
·
2023
·
IF 3.3
Zefeng Zhang,Xianli Fang,Haiyan Qian
ZnS is a well-known photocatalyst in the field of water treatment, but its applicability is limited due to poor visible light sensitivity, low photon efficiency, and photo corrosion. In this study, a new type of ZnS/Ti3C2Tx composite photocatalyst was developed by growing ZnS microspheres on a single-layer Ti3C2Tx, which is based on the sheet-like structure and metal-like characteristics of Ti3C2Tx. The resulting Ti3C2Tx-based composite photocatalyst with ZT0.35% showed superior catalytic activity in the degradation of methyl orange under natural light. The catalytic rate constant was 3.51 times higher than that of ZnS alone, reaching a maximum of 0.0244 min−1. Within 120 minutes, the degradation rate of methyl orange was 96.3%, while that of ZnS was only 41.6%. Photoluminescence and free radical scavenging experiments revealed that the composite structure is responsible for the improved photocatalytic activity and that the ZnS/Ti3C2Tx structure is favorable for the separation and transport of photogenerated carriers. The developed ZnS/Ti3C2Tx composite has great potential as a photocatalyst for the degradation of organic contaminants.
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Crystals
·
2022
·Vol. 12
·期 9
·1286
·
IF 2.67
Yu Yan,Qi Zhang,Zhijian Wang,Qifeng Du,Ruitao Tang,Xiaoyu Wang
The performance of monochromatic perovskite light-emitting diodes (PeLEDs) has undergone rapid development in recent years, while white PeLEDs are still in their infancy. The tandem devices prepared by connecting light-emitting units of different colors with intermediate connectors comprise one of the promising approaches for realizing white light emission. The intermediate connector plays a crucial role in determining the effectiveness of the light-emitting units. In this work, all-perovskite-based white LEDs are assembled by employing sky-blue (490 nm) and red (690 nm) perovskite emitters as active layers. With mixed p-type and n-type organic charge transport materials as the intermediate connector, the highest external quantum efficiency (EQE) of the device was 1.4%, the electroluminescence (EL) peak position of the blue light part was shifted to 512 nm, and the red light part was shifted to 673 nm. In contrast, with organic and inorganic charge transport materials as the intermediate connector, the devices exhibited better charge generation/injection capabilities and a record EQE of 8.5%. The EL peak position of the device prepared from the stored film was not shifted, implying that the organic/inorganic layer effectively suppresses halide migration. Our work paves the way for highly efficient tandem white PeLEDs.Keywords:tandem;white perovskite light-emitting diodes;organic/inorganic intermediate connector
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Nanomaterials
·
2022
·Vol. 12
·期 18
·3132
·
IF 5.719
Longshi Rao,Qing Zhang,Bin Sun,Mingfu Wen,Jiayang Zhang,Guisheng Zhong,Ting Fu,Xiaodong Niu
Carbon dots (CDs) are attracting much interest due to their excellent photoelectric properties and wide range of potential applications. However, it is still a challenge to regulate their bandgap emissions to achieve full-color CDs with high emissions. Herein, we propose an approach for producing full-color emissive CDs by employing a solvent engineering strategy. By only tuning the volume ratio of water and dimethylformamide (H2O/DMF), the photoluminescence (PL) emission wavelengths of the CDs can be changed from 451 to 654 nm. Different fluorescence features of multicolor CDs were systematically investigated. XRD, SEM, TEM, Abs/PL/PLE, XPS, and PL decay lifetime characterizations provided conclusive evidence supporting the extent to which the solvent controlled the dehydration and carbonization processes of the precursors, leading to a variation in their emission color from red to blue. The as-prepared CDs exhibited excellent and stable fluorescence performance even after being heated at 80 °C for 48 h and with UV light continuously irradiated for 15 h. Based on their excellent fluorescent properties and photothermal stability, bright multicolor light-emitting diodes with a high CRI of up to 91 were obtained. We anticipate that these full-color emissive CDs are beneficial for applications in lighting, display, and other fields.Keywords:carbon dots;multicolor emission;solvent engineering;light-emitting diodes
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Catalysts
·
2022
·Vol. 12
·期 11
·1293
·
IF 4.501
Limeng Wu,Xin Yue,Ying Chang,Kunlei Wang,Jinyue Zhang,Jiajie Sun,Zhishun Wei,Ewa Kowalska
Monoclinic scheelite bismuth vanadate (BVO) microballs were prepared by a facile hydrothermal method and subsequently modified with 2 wt% of noble metals (NM = Au, Ag, Cu, Pt and Pd) by a photodeposition route. All materials were characterized by diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR). The photocatalytic performance was investigated by degradation of tetracycline antibiotic under visible light irradiation. Moreover, photocurrent generation under UV/vis was also examined. It was found that BVO modification with all tested NMs resulted in a significant improvement in photocatalytic performance. The highest activity was obtained for Cu/BVO with mainly oxidized forms of copper. Based on scavenger tests (∙O2−and ∙OH as the main responsible species for TC degradation) and redox properties, it was proposed that the Z-scheme mechanism between copper oxides and BVO was responsible for enhanced photocatalytic activity. However, the co-participation of zero-valent forms of NMs should also be considered, either as electron scavengers, plasmonic sensitizers or conductors. Presented data reveal that porous microballs, highly attractive for practical applications due to micro-sized diameter and efficient light harvesting inside the structure, could be efficiently used for environmental and energy purposes under solar radiation.Keywords:photocatalysis;BiVO4;degradation of pollutants;noble metals;photocurrent;surface modification
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Lerong Liu,Weizheng Song,Wan Zheng,Feihu Li,Hanlin Lv,Yuhang Wang,Yanjun Chen,Yifeng Wang
Multilayer beads made from biomacromolecules are useful for encapsulating, protecting, and delivering active ingredients such as drugs, dyes, and proteins. However, their encapsulated cargos are allowed to diffuse slowly out into the surrounding solvent during storage. This study describes a “smart” multilayer bead that can achieve zero leakage for encapsulated materials during storage and controlled release after triggered by near-infrared (NIR) light. The innermost layer of the multilayer bead containing Fe 3 O 4 magnetic nanoparticles is prepared based on the thermal-responsive sol-gel transition of agar, which offers magnetic responsiveness to the bead. The middle layer of the bead embedding gold nanorods (Au NRs) is produced by the ionic crosslinking between alginate and terbium ions. Moreover, encapsulated materials (drugs, dyes, and agrochemicals) are loaded in the middle layer. The outermost layer of the bead, a paraffin-wax shell, is formed at 75 ℃ through the phase transition of paraffin wax . Because of the protection of the paraffin-wax shell, the encapsulated materials present zero leakage when the multilayer bead is placed in aqueous solutions for at least six weeks. Under the irradiation of 808 nm NIR light for 1 min, the multilayer bead is heated up to 50 ℃ by the photothermal effect of Au NRs in the middle layer, which triggers the melting of the paraffin-wax shell. Then, the controlled release of the encapsulated materials can be achieved by the rest of the bead. Furthermore, the bead can be recycled after the release due to its magnetic responsiveness. Consequently, the multilayer bead is a novel, green and economical candidate for diverse applications, especially for the encapsulation and controlled release of hydrophilic materials in bio-related applications.
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Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-11
·
IF 5.418
Jiang Xingwang,Cheng Jie,Liu Ping,Gao Qingguo,Liu Liming
High-quality four-layer molybdenum disulfide (MoS 2 ) nanosheets with lateral dimension of about 11 µm were prepared by ultrasonic treatment of MoS 2 powder with assistance of 1-methyl-2-pyrrolidone (NMP) solvent. The optimal preparation conditions for the preparation of MoS 2 nanosheets were investigated from the aspects of ultrasonic processing time, ultrasonic power and amount ratio of MoS 2 powder and NMP solvent. At the same time, the MoS 2 nanosheets were employed as anode buffer layer in organic light-emitting diode (OLED) with copper nanowire (CuNW) film being anode. MoS 2 nanosheets can reduce roughness of CuNW film, protect CuNW film from oxidation and improve work function of CuNW film. Experiments show that MoS 2 nanosheets can significantly improve the current density and brightness of the OLED with CuNW film being anode. The maximum brightness of the OLED with MoS 2 anode buffer layer is 2.15 times that of the OLED without MoS 2 anode buffer layer. The current density of the OLED with MoS 2 anode buffer layer is also obviously increased compared with the OLED without MoS 2 anode buffer layer.
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