Advanced Optical Materials
·
2022
·Vol. 10
·期 21
·2201053
·
IF 10.05
Xiao-Kai Gong,Lan Li,Jian-Ping Xu,Ru-Kun Ding,Zhao-Wei Zhang,Qian Li,Long Liu,Xiao-Song Zhang
Lead-free halide double perovskites continue to draw increasing attention in view of their nontoxicity and stability compared to lead-based perovskites. High-end full-color displays and white light illumination are based on blue-light excitation. However, the excitation of blue light of lead-free halide double perovskites Cs 2 AgInCl 6 at room temperature faces a great challenge, which is crucial to its commercial application. In this study, Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 / x KBr(KI), which can be excited under blue light, have been synthesized by solid-phase compression method. Under blue-light excitation, Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 /16KBr and Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 /16KI emit 605 nm orange light and 665 nm red light, respectively. Based on that, orange and red light-emitting devices are fabricated excited by blue light. The performance of blue-light excitation can not only make the double perovskites widely used in light-emitting devices, but also as a light-emitting down-shift layer in photovoltaic devices to improve the performance of photovoltaic modules. With the Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 /16KBr, the power conversion efficiency of the Si solar cell increases 4.80% and 8.14% under the sunlight and white light-emitting devices, respectively. The blue-light excitation of lead-free double perovskites at room temperature offers greater development potential in the field of display devices and optoelectronics.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Junting Gao,Xidong Ma,Tiefeng Xu,Yan Gu,Xiufang Chen,Wenxing Chen,Wangyang Lu
Color, as an integral part of human life, enriches human material civilization and spiritual life. However, due to increasingly serious environmental pollution, the use of pigments is no longer limited to beautifying the environment, and their broader applications have also become the focus of research in recent years. Here, a simple one-step calcination method has been used to prepare new functional pigments by combining commercialized inorganic pigments with a novel g-C 3 N 4 photocatalyst. These functional pigments exhibit high photocatalytic activity against nicotine under simulated sunlight and even weak white light emitting diode (white-LED) irradiation, and the degree of removal reached almost 100 % in 105 min. The novel photocatalytic pigments were further appended on the surface of low melting point sheath-core composite polyester fibers (LMPET), and the obtained multicolored photocatalytic fibers displayed multiple functions for photocatalytic degradation of organic pollutants and antibacterial properties. Moreover, the prepared multicolored photocatalytic fibers could be recycled, and their catalytic performance was stable without significant reduction after ten cycles. The enhanced performance could be attributed to the expansion of the visible-light response range and the efficient separation of photogenerated electron–hole pairs. In addition, electron paramagnetic resonance analysis confirmed that •O 2 − and 1 O 2 , rather than •OH, are the main reactive species for the photocatalytic reaction, effectively avoiding the oxidative corrosion of textile substrates. These novel photocatalytic pigments show great potential in the fields of painting and decoration, not only being aesthetically pleasing, but also acting to purify the indoor environment.
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Nanomaterials
·
2022
·Vol. 12
·期 10
·1776
·
IF 5.719
Wentao Xu,Guoqiang Shu,Shihui Zhang,Lei Song,Kui Ma,Hairong Yue
Titanium dioxide is a mainstream photocatalyst, but it still confronts great obstacles of poor visible light absorption and rapid recombination rate of photogenerated carriers. Herein, we describe the design of a highly active visible-light photocatalytic system of graphited carbon layers anchored V2O5/TiO2heterojunctions derived from Ti3C2MXene, which demonstrates about 4.58 and 2.79 times higher degradation activity of MB under visible light (λ > 420 nm) than pure V2O5and TiO2-carbon. Combined with the characterization results, the formed V2O5/TiO2heterojunction promotes the separation of photogenerated carriers, while the graphitized carbon derived from MXene acts as an electronic reservoir to enhance the absorption of visible light. The ESR results show that superoxide radicals and hydroxyl radicals are the main active species in the reaction system. Therefore, we propose a possible mechanism model to provide a feasible idea for the subsequent design of high-efficiency photocatalysts for environmental treatment.Keywords:MXene;heterojunction;degradation;visible light;photocatalysis
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CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 68
·e202202004
·
IF 5.02
Conghui Zhao,Liwei Sun,Yang Xu,Beibei Dong,Yuhong Luo,Jingde Li,Jianxin Chen,Zisheng Zhang
Graphical Iodine-doped Bi 2 GdO 4 Cl with a significantly promoted visible-light-responsive O 2 -evolving performance of 154.8 μmol ⋅ h −1 and an apparent quantum efficiency of ∼1.1 % at 420 nm is reported. The incorporation of I − ions causes the extended light absorption and promoted charge separation. Visible-light-responsive bismuth-based oxyhalide has recently attracted extensive attention, however, the promotion of its charge separation is still challenging. Herein, we introduce iodine into Bi 2 GdO 4 Cl to synthetize I-doped Bi 2 GdO 4 Cl (denoted as yI−Bi 2 GdO 4 Cl, 0≤y≤2). The incorporation of I − ions is found to enhance light absorption and to accelerate charge separation by combining various characterizations such as density functional theory calculation, photoelectrochemical test, electrochemical impedance spectroscopy, photoluminescence spectrum, and open-circuit voltage decay. The O 2 -evolving performances of 1I−Bi 2 GdO 4 Cl with optimized dopant concentration of I − ion and IrO 2 loaded 1I−Bi 2 GdO 4 Cl are tremendously enhanced by ca. 4 and 45 times compared to pristine Bi 2 GdO 4 Cl. Notably, The O 2 evolution rate reaches as high as 154.8 μmol ⋅ h −1 with an apparent quantum efficiency of ∼1.1 % at 420 nm. The synthetic iodine-doped photocatalyst remains stable after long-term photoreaction, demonstrating its potential in the field of photocatalysis.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 12
·3377-3388
·
IF 3.146
Sun Shuhan,Li Shiling,Hao Yibing,Yang Xiao,Dou Xiaomin
g/C 3 N 4 -ZnO composite catalysts were synthesized through surface hybridization of the delocalized conjugated- π structure of g/C 3 N 4 with the closely contacted surface of ZnO via a successive and simultaneous calcination procedure, and two kinds of photocatalysts, g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, were obtained. Heterojunctions were formed between the two components, which promote the separation of photogenerated carriers efficiently, and then enhanced the degradation of 100 mg/L of AMX The degradation rate of g/C 3 N 4 -ZnO1 was 1.54, 11.33, and 2.52-fold that of g/C 3 N 4 -ZnO2, g/C 3 N 4 and ZnO, respectively, at a 3.5-h reaction period, with the dosage of 0.3 g/L, and solution pH at 7.0±0.2. The recycle and reuse ability was excellent and 90.5% of AMX mitigation was achieved in the fifth cycle. For g/C 3 N 4 -ZnO1, electrons migrated from the conduction band of g/C 3 N 4 to that of ZnO via the heterojunction. ·OH and h + were the main active species for AMX degradation, compared to ·O
− 2
dominated for g/C 3 N 4 . Twelve intermediate products were identified, and two degradation pathways were inferred for g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, respectively. Finally, transformation products without lactam rings were achieved, which lost most of the antibacterial potencies, and the ecotoxicity was also dramatically decreased as indicated by the ECOSAR program.
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JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Jinxing Yu,Xiaoxiang Xu
Combining structural coherence and large porosity, semiconducting porous single crystals (PSCs) warrant a great potential as photocatalysts. High photocarrier mobility can be realized in PSCs because of a deficiency in grain boundaries, which in turn greatly alleviates photocarriers’ recombination. The large porosity of PSCs not only provides plenty of accessible surfaces to accommodate catalytic reaction sites but also fortifies photon-matter interplay by reflecting and scattering photons. In this work, taking LaNbON 2 PSCs as an example, we demonstrate the importance of PSCs in activating otherwise almost inactive photocatalyst. Compared to conventional inert LaNbON 2 , LaNbON 2 PSCs exhibit exceptional activity for photocatalytic water redox reactions, delivering a high apparent quantum efficiency, i.e. 6.3% and 10.2% at 420 ± 20 nm for H 2 - and O 2 -evolution reactions, respectively. A Z-scheme system containing LaNbON 2 PSCs has succeeded in overall water splitting (H 2 /O 2 molar ratio 2:1) with high stability under visible light illumination (λ ≥ 420 nm).
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Nanotechnology Reviews
·
2022
·Vol. 11
·期 1
·2526-2534
·
IF 6.739
Ling Tan,Qiandan Fan,Fei Huang,Xin Tian,Wei Wei,Tongxin Bian,Yifan Guo,Xiaoling Xu,Zuowan Zhou
Capturing and detecting Fe 3+ ions in aqueous solution is of great significance in biological systems as well as the water treatment industry. Herein, pyrene-modified cellulose nanocrystal (CNC-1-Pyr) acting as a fluorescent probe was prepared by a one-step esterification reaction, which shows geometry relaxation under UV-light excitation. Experiments and density functional theory-based simulations revealed that the structural geometry relaxation is controlled by the electron excitation and fluorescence emission. The S1 state of CNC-1-Pyr provides a conformation match for coordination with Fe 3+ under the excitation of UV light, facilitating the detecting and capturing of Fe 3+ efficiently.
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Advanced Materials Technologies
·
2022
·Vol. 7
·期 12
·2200370
·
IF 8.856
Junjie Wang,Danyang Li,Yu Luo,Jian Wang,Junbiao Peng
Perovskite light-emitting diodes (PeLEDs) for full-color displays based on inkjet printing technology are increasingly attractive. For potential applications, fabricating high-quality perovskite films with defined-pixel sizes is crucially important. The key issue is how to control the contact properties between the perovskite ink and a hole transport layer (HTL). In this study, a novel strategy is proposed by using the poly[(9,9-bis(3′-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)- alt -2,7-(9,9-dioctylfluorene)] dibromide (PFN-Br) polar polymer to modify the HTL surface, instead of conventional O 2 plasma method. The PFN-Br can enhance the surface energy of HTLs, including PVK, Poly-TPD, TFB, etc., and improve the wettability of perovskite inks on the HTL due to its polar quaternary ammonium groups. Besides, the PFN-Br acts as the easier nucleation to induce a tiny crystallization of perovskites. On the other hand, the diphenyl phosphate liver (DPA) is first used to mix in perovskite inks to optimize the perovskite film phase distribution and the elimination of uncoordinated Pb 2+ , resulting from interactions between PEA + and DPA, Pb 2+ and DPA, respectively. As a result, a defined-pixel matrix green quasi-2D PeLED with the peak external quantum efficiency over 10% via inkjet printing technique is achieved, which is the most efficient matrix green PeLEDs fabricated by inkjet printing technique so far.
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CELLULOSE
·
2022
·Vol. 29
·期 16
·8781-8795
·
IF 6.123
Zhang Tao,Yuan Tiancheng,Xiao Xiao,Peng Haozhe,Fang Xinyu,Wang Kaili,Liu Xiaorong,Li Yanjun
The functional paper holds significant potential in some special fields, which has achieved great development. Nevertheless, using cellulose paper to fabricate functional paper, which integrates transparency, robustness, flexibility, shape memory, and sustainability, remains a challenge. Herein, the vitrimer precursor was vacuum impregnated into cellulose paper and then in-situ polymerized to develop a vitrimer-cellulose paper (VCP) with transparency, shape manipulation, robustness, and sustainability. Taking advantage of the vitrimer’s dynamic performance, the resulting VCP demonstrated excellent optical transparency (transmittance of 84%, haze of 75%), enhanced mechanical strength (tensile strength of 80.5 MPa), chemical resistance, thermal-triggered shape manipulation, and reprocessing. Noteworthily, VCP possessed outstanding light management capability with effective light propagating and scattering performance. Furthermore, VCP laminate showed increased mechanical property with the increased layers, and it can be reprocessed to a bulk composite after crushing. These incorporated merits of VCP make a promising candidate for light management and sustainable building application.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Zhang Zhang,Gao An,Sun Chunyang
Developing bioresponsive nanocarriers with particular tumor cell targeting and on-demand payload release has remained a great challenge for combined chemo-photodynamic therapy (chemo-PDT). In this study, an intelligent nanocarrier (DATAT-NPCe6) responded to hierarchical endogenous tumor pH, and an exogenous red light was developed through a simple mixed micelle approach. The outside TAT ligand was masked to prevent an unexpected interaction in blood circulation. Following the accumulation of DATAT-NPCe6 in tumor tissues, tumor acidity at pH ∼6.5 recovered its targeting ability via triggering DA moiety degradation. Furthermore, the cascaded chemo-PDT was accomplished through light-stimulated nanocarrier disassembly and doxorubicin (DOX) release. Taking advantage of stability and controllability, this work provides a facile approach to designing bioresponsive nanocarriers and represents a proof-of-concept combinatorial chemo-PDT treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Shangyuan Ni,Zhengrong Fu,Lin Li,Manying Ma,Yuelin Liu
Construction of heterojunction between semiconductors is considered an effective strategy for enhancing photocatalytic capability. Herein, this work prepared an abundant porous g-C 3 N 4 /TiO 2 photocatalyst , with the two-dimensional (2D) nanosheet g-C 3 N 4 and nanoparticle TiO 2 . The heterojunction both enhanced the ultraviolet (UV) light absorption ability, and inhibited the recombination of photogenerated electron-hole (h + ) pairs. As expected, the optimal 4 % g-C 3 N 4 /TiO 2 (g-C 3 N 4 :TiO 2 = 1:25) exhibited a prominent degradation efficiency of 96.53 % in the photocatalytic performance of tetracycline hydrochloride (TCH) under UV irradiation . The recycling of the heterojunction photocatalyst g-C 3 N 4 /TiO 2 remained stability and reusability. The main active species were·O 2- , h + and·OH, and the formation of internal electric field on the step-scheme (S-scheme) heterojunction interface accelerated the migration of photogenerated carriers. Moreover, several environmental factors on degradation such as dose, pH, and the initial concentration of TCH were investigated. This work could be spread to the conceive of other S-scheme heterojunction photocatalysts in application to different environmental demands.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lian Chen,Xianshuo Wei,Ye Sun,Yaoting Xue,Jingwen Wang,Qijun Wu,Chunxin Ma,Xuxu Yang,Gaigai Duan,Feng Wang,Shaoju Jian,Weisen Yang,Shaohua Jiang
Near-infrared light-responsive hydrogels are one of the most important soft biomimetic actuators owing to their accuracy, remote control performance, and permeability. However, the complex deformations and materials of hydrogel actuators are still a serious challenge. Herein, we have developed a novel composite hydrogel actuator by combining natural bamboo sheet and nigrosine/poly(N-isopropylacrylamide) (PNIPAM) composite hydrogel. The high-efficient photothermal conversion of the nigrosine/PNIPAM composite hydrogel sheet generates light-responsive actuation that is remotely controllable. Furthermore, the bamboo sheet with fiber-oriented structure can be cut at different angles, which facilitates programmable 3D complex deformations in the actuator. Accordingly, we have designed a series of biomimetic actuating devices, including simulations of butterfly antenna, Dendrobium , smart switch, and even a multi-step deformational biomimetic claw. In addition, we also explored a biomimetic insect with precisely-controlled fast movements on the water surface based on Marangoni effect. This work provides a simple but general strategy for fabricating biomimetic actuators and will inspire new designs for intelligent soft actuators.
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