RESEARCH ON CHEMICAL INTERMEDIATES
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2018
·Vol. 44
·期 5
·3061-3079
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IF 1.674
Wang Junxiu,Chen Kuan,Shen Yi,Wang Xi,Guo Yongfu,Zhou Xiaoji,Bai Renbi
Abstract To heighten the absorption to visible light and improve photocatalytic degradation to organic pollutants, a novel photocatalyst of m-Bi 2 O 4 /Bi 2 O 2 CO 3 was constructed through a facile hydrothermal method. The crystal structure, optical properties, morphology, composition and photocatalytic ability of the photocatalysts were characterized via X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscope (TEM), high resolution TEM, selected-area electron diffraction and X-ray photoelectron spectroscopy technologies. The as-prepared photocatalysts could efficiently degrade rhodamine B and mixed dye under visible light. The removal rate was up to 95.3% within 50 min. The results demonstrated that m-Bi 2 O 4 /Bi 2 O 2 CO 3 photocatalysts showed outstanding photocatalytic degradation ability compared to the single photocatalyst with the narrow band gap. In addition, photocurrent response tests certified that the heterostructure of the photocatalysts effectively accelerated the separation and migration of photo-induced electrons and holes. Active species trapping experiments indicated that holes (h + ) and superoxide radical (•O 2 − ) were major species rather than hydroxyl radicals (•OH) during the degradation process of organics. According to the test results, a probable photocatalytic mechanism was proposed. This work provided a new and efficient photocatalyst for environmental remediation and water treatment. Graphical Abstract
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ACS Applied Nano Materials
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2024
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IF 5.3
Zhengtong Wang,Cong Chen,Kai Lian,Zhihui Deng,Yiwei Zhao,Jiachen Han,Yelin Ding,Chun Sun
White light-emitting diodes (WLEDs) have become essential to various aspects of our daily lives. However, the absence of a strong cyan emission significantly hinders the development of full-spectrum WLEDs that could achieve high-quality applications. Here, a feasible method is introduced to synthesize highly luminescent and stable CsPbBr3 by employing an efficient dual-matrix encapsulation technique. Sodium citrate (SC) is utilized as a matrix to disperse these CsPbBr3 nanomaterials, thereby reducing self-absorption and energy transfer. In addition to functioning as a matrix, SC also passivates the perovskite nanomaterials, resulting in an increased photoluminescence quantum yield (PLQY) and enhanced stability of the perovskite. Notably, the stability of the perovskite, especially its resistance to water, is significantly enhanced after encapsulating the composite within poly(methyl methacrylate) (PMMA). A series of full-spectrum WLEDs with variable color temperatures ranging from 2763 to 7145 K and high color rendering indices (90–96) were fabricated using SC-CsPbBr3@PMMA in combination with commercially available YAG and red phosphors CaAlSiN3:Eu2+. This research opens up new avenues for the utilization of perovskite nanomaterials in the development of next-generation full-visible-spectrum WLED lighting.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yanqiao Xu,Wentao Li,Qing Hu,Hezhen Wu,Yongao Guo,Feng Jiang,Guo Feng,Xiaojun Zhang,Sanhai Wang,Lianjun Wang,Wan Jiang
Lead-halide perovskite nanocrystals (NCs) present superior photoelectric properties, but the poor stability seriously hinders their practical application. The encapsulation of perovskite NCs inside mesoporous silica (m-SiO 2 ) matrix is considered as one of the most feasible pathways to improve the stability of NCs. However, the challenges of loose encapsulation structure, aggregation of particles, high energy consumption during the preparation of CsPbX 3 @m-SiO 2 composites have not yet been overcome, which throw a shadow over the large-scale commercial applications. Here, we present a dual-shell encapsulation strategy that enables the formation of highly emissive CsPbBr 3 @m-SiO 2 @SiO 2 composites, achieving an exceptional photoluminescence quantum yield (PLQY) of 97.37 %. The reaction parameters for the preparation of composites are meticulous investigated. The CsPbBr 3 NCs can be well formed inside the pores of m-SiO 2 as the m-SiO 2 is introduced into the precursor solution. The secondary SiO 2 shells can effectively seal the open pores of m-SiO 2 . As a result, the as-prepared CsPbBr 3 @m-SiO 2 @SiO 2 composites present excellent stability, in which the composites can maintain 93.16 % of initial intensity after storage for 84 days. Besides, a series of CsPbX 3 @m-SiO 2 @SiO 2 composites with tunable emission wavelength in the range of 428.6–630.6 nm are prepared through facile designing the halide ratios of precursor solution, which present a wide color gamut (148.48 % of the National Television Standards Committee). In addition, a white light-emitting diode (LED) is fabricated by combining CsPbBr 3 @m-SiO 2 @SiO 2 composites and K 2 SiF 6 :Mn 4+ phosphors with a 455 nm LED chip, which exhibits good photoelectric performances. This facile low-temperature dual-shell encapsulation strategy reported here provides a new pathway for preparing high-performance perovskite composites, facilitating their practical photoelectric application.
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Open Ceramics
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2024
·
IF 2.9
Shuhao Qi,Tengkuo Sun,Mi Cui,Hongyan Li,Yanlong Chen,Tao Zhou,Qin Lian,Changquan Shi,Dichen Li
Zirconia is a ceramic material with fine properties for dental restorations, but the color of zirconia does not match natural teeth color. In this study, the effect of zirconia doped with different rare earth oxides on the color of denture manufactured by Digital Light Processing (DLP) method was investigated. Experimental results showed that the color of the ceramic parts after sintering could cover Vita 3D colorimetric plate for natural teeth, and the color accuracy was within 1.5 NBS. Meanwhile, the forming accuracy of the denture reached 67.7 μm, and the three-point bending strength was 520.32 ± 35.44–649.10 ± 42.31 MPa, which met the requirements of triple crown in dentistry. This study establishes a method to achieve colors of natural teeth using DLP technology, and the results of this study have important leading implications for the use of additive manufacturing technology to fabricate natural-color ceramic dentures for dental applications.
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Journal of the American Chemical Society
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2024
·
IF 14.4
Jingwen Yao,Zhiyu Wang,Yuling Huang,Jie Xue,Dengliang Zhang,Jiangshan Chen,Xihan Chen,Shou-Cheng Dong,Haipeng Lu
Introducing molecular chirality into perovskite crystal structures has enabled the control of carrier spin states, giving rise to circularly polarized luminescence (CPL) in thin films and circularly polarized electroluminescence (CPEL) in LEDs. Spin-LEDs can be fabricated either through a spin-filtering layer enabled by chiral-induced spin selectivity or a chiral emissive layer. The former requires a high degree of spin polarization and a compatible spinterface for efficient spin injection, which might not be easily integrated into LEDs. Alternatively, a chiral emissive layer can also generate circularly polarized electroluminescence, but the efficiency remains low and the fundamental mechanism is elusive. In this work, we report an efficient green LED based on quasi-two-dimensional (quasi-2D) chiral perovskites as the emitting layer (EML), where CPEL is directly produced without separate carrier spin injection. The optimized chiral perovskite thin films exhibited strong CPL at 535 nm with a photoluminescence quantum yield (PLQY) of 91% and a photoluminescence dissymmetry factor (glum) of 8.6 × 10–2. Efficient green spin-LEDs were successfully demonstrated, with a large EL dissymmetry factor (gEL) of 7.8 × 10–2 and a maximum external quantum efficiency (EQE) of 13.5% at room temperature. Ultrafast transient absorption (TA) spectroscopic study shows that the CPEL is generated from a rapid energy transfer accompanied by spin transfer from 2D to 3D perovskites. Our study not only demonstrates a reliable approach to achieve high performance spin-LEDs but also reveals the fundamental mechanism of CPEL with an emissive layer of chiral perovskites.
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JOURNAL OF CATALYSIS
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2025
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IF 6.5
Jue Wang,Jinyi Yang,Siyu Zeng,Huitao Liu,Fei Li,Haijiao Xie,Senpei Tang,Zaihui Fu,Youji Li
The highly selective synthesis of KA oil (cyclohexanol and cyclohexanone) from the oxidation of cyclohexane (CHA) with O 2 under mild conditions is still a very important and challenging research topic. This paper discloses that the hybrid (DTCN) is easily prepared by inducing carbon nitride (CN) in the synthesis of decatungstate (DT) and is found to be efficiently photo-catalyst for the above selective oxidation in acetonitrile. After illumination (LED of 405 nm) for 2 h, the best DTCN-0.5 can achieve 41.03 % CHA conversion and greater than 95 % KA oil selectivity with an apparent quantum efficiency of 25.52 %, which is much superior to the pure DT (12.46 % CHA conversion). Also, it is active for the selective oxidation of other substrates containing inert C(sp 3 )-H bonds. A series of characterizations, free radical trapping and isotope tracing tests as well as DFT calculations support that the doped CN can construct a built-in electric field with DT to accelerate the separation of the photo-generated charge, thus hoisting the photo-excited quantum efficiency of DT. Furthermore, it also plays a key role in converting O 2 into superoxide (•O 2 – ) radical as the active oxygen donor. Additionally, the doped CN also contributes to the limited participation of water as a weak oxygen donor in the selective oxidation of CHA to cyclohexanol. It is hoped that this work will be informative for advancing the key technology of selective oxidation of saturated hydrocarbons under mild conditions.
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Nanomaterials
·
2024
·Vol. 14
·期 24
·1996
·
IF 4.4
Dongxu Wang,Wanfeng Mao,Lihong Zhao,Duo Meng,Jiaqi Tang,Tengfei Wu
With the development of industry, agriculture, and aquaculture, excessive ammonia nitrogen mainly involving ionic ammonia (NH4+) and molecular ammonia (NH3) has inevitable access to the aquatic environment, posing a severe threat to water safety. Photocatalytic technology shows great advantages for ammonia nitrogen removal, such as its efficiency, reusability, low cost, and environmental friendliness. In this study, CP (g-C3N4/CoP) composite materials, which exhibited high-efficiency ammonia nitrogen removal, were synthesized through a simple self-assembly method. For the optimal CP-10 (10% CoP) samples, the removal rate of ammonia nitrogen reached up to 94.8% within 80 min under visible light illumination. In addition, the nitrogen selectivityS(N2)is about 60% for all oxidative products. The high performance of the CP-10 photocatalysts can be ascribed to the effective separation and transmission of electron–hole pairs caused by their heterogeneous structure. This research has significance for the application of photocatalysis for the remediation of ammonia nitrogen wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Yidan Luo,Puxin Xu,Chao Liu,Huiyin Ye,Ke Peng,Shuohan Yu,Mingshan Xue,Yu Xie,Luhui Wang
Constructing heterostructures is an effective method for enhancing photocatalytic efficiency. Herein, a two-dimensional (2D)/2D heterojunction of NiAl-LDH/BiOBr with a built-in electric field (BIEF) was firstly synthesized. The photocatalytic efficiency of CO 2 reduction was assessed under visible light. And the findings revealed that the composite with 10 wt% NiAl-LDH demonstrated the highest CO 2 photoreduction performance, yielding a rate of 10.7 μmol·g −1 ·h −1 for CO generation, which was 21.4 and 4.3 times higher than that of pure NiAl-LDH and BiOBr. The heterojunction of the sample was type-II heterojunction with the analysis of XPS, band structures, and in-situ XPS. Photoluminescence (PL) and electrochemical tests demonstrated that the type-II heterojunction between NiAl-LDH and BiOBr efficiently enhanced the separation and transfer of electrons and holes, consequently boosting the photocatalytic performance. Besides, in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS) was employed to reveal the reaction intermediates of CO 2 . This work provides experimental approaches and theoretical development of nanocomposite for photoreduction of CO 2 .
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Materials Today Communications
·
2025
·
IF 4.5
Lifeng Chi,Xiutong Wang,Siyao Guo,Meipeng Ren,Hua Guo,Mingchun Wang,Youbo Nan,Jinguo Wang
Photocathodic protection has obtained enormous attention in the field of metal corrosion control as an efficient and eco-friendly technology. Developing the photoelectrode with good photoelectrochemical properties is a prerequisite for achieving satisfactory photocathodic protection performance. Here, the NH 2 -MIL-101(Cr)/TiO 2 heterostructures are prepared. Meanwhile, the organic linkers and metal ions from NH 2 -MIL-101(Cr) are used to synthesize the N- and Cr-doped TiO 2 anodes, respectively. The UV–vis DRS, photoluminescence spectra and photoelectrochemical tests conducted under visible light demonstrate the enhanced light absorption, suppressed photoinduced charge carrier recombination, and accelerated separation and transfer rates of photoinduced electron-hole pairs in the TiO 2 composites. The 304 stainless steel connected with NH 2 -MIL-101(Cr)/TiO 2 heterostructures shows the most negative potential (about −0.72 V vs. SCE) and satisfied stability in a 3.5 wt% NaCl solution. The result can be explained by the significantly enhanced optical and photoelectrochemical properties and the strong electric field intensity in the composite heterojunctions. Besides, it has been observed that the NH 2 -MIL-101(Cr)/TiO 2 heterostructures exhibit the best photocathodic protection performance than Cr and N-doped TiO 2 anodes. This research broadens the application scope of MOFs in corrosion resistance and helps to assess the effect of heterostructure construction and element doping on TiO 2 .
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Tao Gong,Qing Ma,Kaili Qin,Lingxi Wei,Chaochao Wen,hui rui ZHU,Xiaoning Li,Bingmei Chang,Wenting Liang,Rui Guo
Recently, the advancements in the field of responsive nanomaterials have created new possibilities for restraining the overuse of antibiotics. In this research, we present the fabrication of linear maltodextrin and cyclodextrin polymer (LM-CD) modified graphene oxide (GO) nanocomposites, which were subsequently loaded with levofloxacin (LVN) and oxytetracycline (OXY). The as-prepared nanocomplex (GO-LM-CD@LVN and GO-LM-CD@OXY) exhibited the remarkable synergistic antibacterial efficacy through the combined effects of photothermal therapy and pH-responsive drug delivery, effectively eradicating multidrug-resistant Escherichia coli and Staphylococcus aureus, while concurrently reducing the dosage of antibiotics. The bactericidal rate of 20 µg/mL GO-LM-CD@LVN and GO-LM-CD@OXY against the aforementioned bacteria was nearly 100% upon NIR irradiation, demonstrating exceptional photothermal properties. In addition, the photochemotherapy effect of the GO-LM-CD@LVN was verified by wound healing experiments in mice. The results demonstrated that the application of GO-LM-CD@LVN under NIR irradiation for 10 days resulted in a wound healing rate approximately 19% higher than that of the blank control group, indicating a remarkable and rapid therapeutic effect. Furthermore, histological analysis using H&E staining revealed no significant impact on the visceral tissues of mice treated with GO-LM-CD@LVN. Collectively, GO-LM-CD is anticipated to serve as a novel photothermal/pH-responsive nanocarrier for achieving efficient antibacterial effects through the synergistic interplay between photothermal materials and antibacterial drugs.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
JinXia Zhang,Dan Liu,Juan Xiang,Minghui Yang
Major depressive disorder (MDD) is a prevalent brain disorder affecting more than 2% of the world’s population. Due to the lack of well-specific biomarkers, it is difficult to distinguish MDD from other diseases with similar clinical symptoms (such as Alzheimer’s disease and cerebral thrombosis). In this work, we provided a strategy to address this issue by constructing a combinatorial biomarker of serum glial fibrillary acidic protein (GFAP) and neurofilament light chain (NFL). To achieve the convenient and sensitive detection of two proteins, we developed an electrochemical immunosandwich sensor using two metal-ion-doped carbon dots (Pb-CDs and Cu-CDs) as probes for signal output. Each probe contains approximately 300 Pb2+ or 200 Cu2+, providing excellent signal amplification. This method achieved detection limits of 0.3 pg mL–1 for GFAP and 0.2 pg mL–1 for NFL, lower than most of the reported detection limits. Analysis of real serum samples showed that the concentration ratio of GFAP to NFL, which is associated with the relative degree of brain inflammation and neurodegeneration, is suitable for not only distinguishing MDD from healthy individuals but also specifically distinguishing MDD from Alzheimer’s disease and cerebral thrombosis. The good specificity gives the combinatorial GFAP/NFL biomarker broad application prospects in the screening, diagnosis, and treatment of MDD.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Haonan Zhu,Fangyuan Wang,Yingying Cao,Yuhai Yang,Siyu Yang,Zipeng Zou,Fengjie Hu,Feng Chen,Jianping Qiu,Shuang Song
Nb 2 O 5 based photocatalysts have garnered significant attention in the field of antibiotic photodegradation due to their potential. Enhancing the efficiency of carrier separation efficiency still remains a crucial factor for optimizing photocatalytic performance. Herein, a Nb 2 O 5 /Co 3 O 4 p–n heterojunction photocatalyst was synthesized by a straightforward one-step hydrothermal method. The Nb 2 O 5 /Co 3 O 4 composites effectively utilized visible light to catalytically degrade norfloxacin, achieving 89.2% degradation in 90 min. This performance was 2.68 and 7.42-fold greater than pure Nb 2 O 5 and Co 3 O 4 , respectively. Furthermore, this composite maintained its high activity through five cycles of photocatalysis. The exceptional performance was creditable to the establishment of p-n heterojunction structure between Nb 2 O 5 and Co 3 O 4 , which effectively inhibited the electron-hole recombination and distinctly broadens the visible light adsorption region. •O 2 − and h + were confirmed as the critical active species in this process. The primary degradation pathways for norfloxacin were decarboxylation and ring-opening. This study introduced an innovative method for developing and fabricating flower-like Nb 2 O 5 -based heterojunctions for enhancing photocatalytic efficiency. This approach held significant promise for the effective treatment of antibiotic-contaminated wastewater through photocatalysis.
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