CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 7
·2100291
·
IF 1.599
Shuang Wang,Minghui Yu,Hao Yu,Yuye Cheng,Minghao Dou,Xiaoyu Gong,Zhiqiang Li,Hongyu Shao,Guangyu Chen,Shenjie Li,Yanyan Chen
The design and construction of Ag 2 S heterostructures capable of significantly separating photocarriers is a significant challenge in photocatalysis. In this study, CdS/Ag 2 S heterojunction composite photocatalyst is fabricated through a simple one-step hydrothermal method. The composite structure is characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflection spectroscopy. Under visible light irradiation, the photocatalytic activity of the sample is evaluated by degradation of methyl orange. The photoelectric chemical performance of the CdS nanoparticles modified by Ag 2 S is closely related to the ratio of Cd/Ag cation. The experimental results show that the sample ACS-2 (CdS-Ag 2 S = 1:1) composite has higher charge transfer/separation efficiency and longer carrier life. The degradation efficiency reaches 74.4% within 30 min, and the degradation rate constant is 0.047 min −1 . After four cycles, the degradation efficiency of the catalyst only decreases slightly, indicating that the CdS/Ag 2 S catalyst has good stability and repeatability. Meanwhile, the study of the photocatalytic mechanism shows that •O 1 − is the primary active substance in the catalytic process, and h + and •OH play a secondary role. This work provides a great significance for constructing efficient Ag 2 S-based heterojunction photocatalyst systems.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiali Meng,Qin Lian,Shuang Xi,Yingjie Yi,Yi Lu,Guofeng Wu
Zirconia is extensively used for manufacturing dental prostheses because of its superior mechanical properties . The idea of using 3D printing to manufacture zirconia dental prostheses has gradually become popular, but printing accurate shapes and obtaining excellent dimensional accuracy still remain challenging. In this study, the optimal curing parameters and shrinkage ratios of zirconia slurry were investigated using a multi-angle model and a standard fixed crown model. Then the dimensional accuracy and crown fit were investigated, and the fixed crown and fixed bridge were fabricated by using digital light processing (DLP) technology. Further, the dimensional accuracy and crown fit were investigated. The results showed that the optimal curing parameters and enlargement factors for zirconia fixed crown printing were 80 PWM (light source power), 2s (curing time) and 1.400, 1.400, 1.500 (in X, Y, Z directions), respectively. The internal fit was 239.3 ± 7.9 μm, which met the clinical criteria (≤300 μm), whereas the marginal fit was 128.1 ± 7.1 μm, which was extremely close to the clinical criteria (≤120 μm). For dimensional accuracy, the standard error of sintered fixed crown was 0.14 ± 0.06 mm, and the boundary dimensional accuracy and anatomical landmark points’ dimensional accuracy were also investigated. In addition, the density of sintered zirconia was 6.01 ± 0.02 g/cm 3 . From the results of this study, it could be found that the crown fit of zirconia fixed crowns printed using the DLP technique could be close to clinical standards, although there is still a gap with the zirconia fixed crowns from the milling technique. In addition incomplete removal of the support structures have a negative impact on dimensional accuracy, hence it is necessary to further explore the optimization strategies of the support structures for improving the dimensional accuracy of fixed crowns printed by DLP.
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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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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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ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Xiao-Fang Hou,Shu Zhang,Xiao Chen,Hari Krishna Bisoyi,Tianchi Xu,Jiang Liu,Dongzhong Chen,Xu-Man Chen,Quan Li
Artificial supramolecular light-harvesting systems have expanded various properties on photoluminescence, enabling promising applications on cell imaging, especially for imaging in organelles. Supramolecular light-harvesting systems have been used for imaging in some organelles such as lysosome, Golgi apparatus, and mitochondrion, but developing a supramolecular light-harvesting platform for imaging two organelles synchronously still remains a great challenge. Here, we report a series of lower-rim dodecyl-modified sulfonato-calix[4]arene-mediated supramolecular light-harvesting platforms for efficient light-harvesting from three naphthalene diphenylvinylpyridiniums containing acceptors, Nile Red, and Nile Blue. All of the constructed supramolecular light-harvesting systems possess high light-harvesting efficiency. Furthermore, when the two acceptors are loaded simultaneously in a single light-harvesting donor system for imaging in human prostate cancer cells, organelle imaging in lysosome and Golgi apparatus can be realized at the same time with distinctive wavelength emission. Nile Red receives the light-harvesting energy from the donors, reaching orange emissions (625 nm) in lysosome while Nile Blue shows a near-infrared light-harvesting emission at 675 nm in Golgi apparatus in the same cells. Thus, the light harvesting system provides a pathway for synchronously efficient cell imaging in two distinct organelles with a single type of photoluminescent supramolecular nanoparticles.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hao Luo,Jiaxin Yan,Yiwei Shan,Jianwen Zhou,Jun Yu,Bruno Boury,Hui Wu,He Xiao,Liulian Huang,Zhanhui Yuan,Lihui Chen
Rational design of efficient semiconductors for photocatalytic nitrogen fixation is an urgent challenge for artificial ammonia (NH 3 ) production under mild condition. Recently, graphitic carbon nitride (g-C 3 N 4 , CN) shows fascinating potential in photocatalytic nitrogen fixation under visible light. However, compared with other catalysts, the low NH 3 production with pure CN leads to the restriction of practical application. Herein, we covalently coupled covalent organic frameworks (Tptta-COF) and carboxylated carbon nanotubes (CNT) onto CN with amido-linkage and imine-linkage, respectively, through the hydrothermal reaction. Compared with the pristine CN, the obtained COF/CN/CNT achieved larger specific surface area, more visible light absorption and more efficient separation of the photo-generated carriers. The optimal catalyst (COF/CN/CNT) exhibited enhanced photocatalytic activity with NH 3 conversion of 864 μmol·g −1 within 4 h under visible light illumination. Moreover, the introduction of COF and CNT results in a 6.20 times improved photocatalytic NH 3 conversion rate (211 μmol·g −1 ·h −1 ) under visible light in contrast to that of the pure CN. The boosting NH 3 production is due to the dual covalent decoration effect of COF and CNT. On the one hand, the COF introduction is favorable for the regulation of band gap, promoting specific surface area as well as N 2 adsorption ability. On the other hand, the CNT introduction not only enhances optical light harvesting, but also accelerates the transfer of photo-excited electron, maintaining high efficient separation of photo-generated carriers. This dual covalent decoration, therefore, shows a potential as a feasible strategy of combining light-harvesting and charge transfer for efficient NH 3 production.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Chumin Yan,Xiaoli Dong,Yu Wang,Nan Zheng,Hui Dang,Hongchao Ma,Xiufang Zhang
As an efficient and sustainable technology, photocatalysis driven by visible light has made great contributions to the removal of heavy metals from environment. In this work, a series of Cd 3 (TMT) 2 /CdS heterojunction composite photocatalysts were prepared by self-formation of CdS nanoparticles using an octahedral coordination polymer Cd 3 (C 3 N 3 S 3 ) 2 (denoted as Cd 3 (TMT) 2 ) as a precursor. The photocatalytic performance of Cd 3 (TMT) 2 /CdS heterojunction composites for Cr(VI) has been significantly improved under visible light irradiation owing to effective separation and migration of photoexcited charge carriers. Moreover, Cd 3 (TMT) 2 /CdS composites exhibited remarkable photocatalytic reduction performance of Cr(VI) solution with high concentration. This photocatalyst provides a novel route in the photoreduction of Cr(VI).
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ChemSusChem
·
2022
·Vol. 15
·期 14
·e202200337
·
IF 9.14
Li-Qi Qiu,Zhi-Wen Yang,Xiangyang Yao,Xiao-Yang Li,Liang-Nian He
Graphical CO 2 photoreduction : Toward building robust artificial photosynthetic systems, a series of single-active-site rhenium bipyridyl complexes with dipyrromethene-BF 2 units exhibit outstanding catalytic efficiency for visible light-driven-CO 2 reduction. New rhenium bipyridyl complexes with dipyrromethene-BF 2 chromophores (A-ReBDP-CZ, A-ReBDP 2 , ReBDP-CZ, and ReBDP 2 ) were developed for highly efficient photocatalytic carbon dioxide (CO 2 ) reduction to carbon monoxide (CO). These catalysts consisted of two moderate electron-deficient groups (dipyrromethene-BF 2 , BDP) as the visible-light-harvesting antenna as well as both electron donor ( N -phenylcarbazole, CZ) and acceptor (BDP) on Re bipyridyl framework. Among ReBDP-CZ and ReBDP 2 complexes, the ReBDP 2 incorporating two electron-deficient BDP chromophores had a longer-lived photoexcited state (182.4 μs) and a twofold enhanced molar absorption coefficient ( ϵ =157000 m −1 cm −1 ) compared with ReBDP-CZ. Thus, ReBDP 2 achieved the superior photocatalytic reactivity and stability with a CO turnover number (TON CO ) value as high as 1323 and quantum yield ( Φ CO ) up to 55 %, which was the most excellent photocatalysis efficiency among the single-active-site Re catalysts without additional photosensitizer. Furthermore, the acetylene-bridged linker was detrimental to the photoactivity and durability of the catalyst. In brief, two BDP-based Re bipyridyl systems with outstanding catalytic performance and significant visible-light-harvesting capabilities in the solar spectrum offer a promising strategy for solar-to-fuel conversion schemes.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Yuhuan Wang,Dengchao Wang,Shuqing Dong,Jianyu Qiao,Zhixing Zeng,Shijun Shao
Photoelectrochemical (PEC) analysis technique provides a unique route for sensitive biomolecular detection. In this paper, a novel visible-light-driven PEC sensor for detection of dopamine (DA) was fabricated based on ultrathin FeOOH cocatalyst modified nanoporous BiVO 4 photoanode. Scanning electrochemical microscopy (SECM) technique was employed to characterize the photocatalytic activities of the as-prepared photoanodes surfaces, and the first-order heterogenous electron transfer rate constants ( K eff ) were evaluated, which further revealed the photocatalytic performance of the modified photoanodes in water oxidation and the PEC sensing mechanism. A remarkable water oxidation photocurrent on the ITO/BiVO 4 /FeOOH photoanode could be achieved and served as anodic photocurrent of blank sample for PEC sensing dopamine (DA), which showed linearly range of 0.2–40 μM and 40–1400 μM with a detection limit of 0.09 μM. This method showed simplicity, high sensitivity and selectivity, high stability and wide linearity range, which provided a promising platform for the development of PEC sensor and offered an insight into the exploitation of BiVO 4 -based photolysis water materials for PEC bioanalytical purposes.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Chun Yang,Feng Zhang,Xiao Liu,Yuxin Du,Di Huang,Jun Liu,Lixia Xie,Guiyin Zhou,Jianxin Tang
An important issue in photocatalysis is the light required to carry out the catalytic reaction, so maintaining photocatalytic reaction activity in the dark has been the ultimate target of expanding photocatalytic technology. Herein, we report a photocatalyst g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ through a strategy that couples the energy-storing and light-releasing properties of long afterglow materials and the light-absorbing properties of photocatalytic materials. g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ is able to effectively degrade methyl orange in water under visible light using molecular oxygen in the air, but it maintains significant methyl orange degradation activity after the light is turned off, as if SAO acts as a built-in light source in it. The photocatalytic degradation mechanism is investigated by active species capture experiments, which shows that superoxide radicals (•O 2 − ), hydroxyl radicals (•OH), holes (h + ), and singlet oxygen ( 1 O 2 ) generate during the photocatalytic process. Among them, •O 2 − is the relatively predominantly acting reactive species. This study exemplifies the design of a continuously working photocatalyst with conceptual value for light storage, which provides ideas for practical energy and environmental system applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 10
·7349-7356
·
IF 2.779
Zhou Xin,Tong Xuan,Li Xiaolong,Min Yonggang,Qian Yannan
To balance the carrier injection, adjusting the thickness of PEDOT:PSS through a simple water diluting was a feasible strategy to improve the efficiency of CsPbBrI 2 perovskite quantum dots light-emitting diode (PeLED). CsPbBrI 2 perovskite quantum dots (PeQDs) with a uniform and monodisperse cubic phase exhibited a red light at 649 nm and with CIE of (0.697, 0.302). Based on PEDOT:PSS film with the thickness of 40 nm, a CsPbBrI 2 PeLED displayed 4.3-fold external quantum efficiency improvement up to 3.44%, and 22.3-fold enhancement in luminance, which was attributed to an effective hole transport and an increased electrical conductivity.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yu Zhang,Guishun Li,Guangning Hou,Jianqiu Lin,Maosheng Chen,Shaohua Liu,Hechun Lin,Junfeng Fang,Chengbin Jing,Junhao Chu
Inorganic cesium lead halide perovskite nanocrystals (NCs) show promising application in the field of optoelectronic devices. However, the poor stability and low photoluminescence quantum yield (PLQY) have been a huge hurdle for practical applications. Ligand engineering strategy was proven to be an effective way to improve the stability and PLQY. Herein, we utilize a multidentate ligand of Boc-D-Glutamic acid (BDGA) to treat the perovskite NCs, enabling exceptional quantum yield approaching 100% and superior colloidal stability (about 10% reduction after 60 days storage at ambient conditions), as well as greatly enhanced resistance to thermal treatment and UV irradiation which can be ascribed to the surface defect passivation and an efficient ligand exchange with robust affinity and/or compensation. Besides, the as-fabricated white light-emitting diodes (WLEDs) exhibits a high luminous efficiency of 93.5 lm/W and a wide color gamut (128% of the National Television System Committee and 95% Rec. 2020). This work provides a facile route to realize high PLYQ and improve the challenging stability issue in perovskite NCs.
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