查找使用阿拉丁产品的科研文献

Constructing flower-like MoS2/ZnIn2S4 microspheres for efficient visible light-driven photocatalytic removal of hexavalent chromium

Wang Yuanyuan,Wu Linqiu,Hu Yingfei,Du Hongxiu,Liu Pengfei,Hao Lingyun,Guan Hangmin,Zhao Yijie

Photocatalytic removal of hexavalent chromium (Cr(VI)) based on semiconductor is important under visible light for environment and energy. Herein, a visible light-responsive heterojunction composed of molybdenum disulfide and zinc indium sulfide was synthesized through a simple one-pot hydrothermal method to ensure full contact between the two components to efficiently improve the Cr(VI) reduction. The MoS 2 /ZnIn 2 S 4 composites build heterojunctions between MoS 2 and ZnIn 2 S 4 to inhibit recombination of photogenerated holes and electrons and provide the reaction sites to trap photogenerated electrons to participate in the reduction of Cr(VI). The highly efficient reduction of Cr(VI) was obtained by adjusting the proportion of molybdenum disulfide. It demonstrates that the 0.5 wt% MoS 2 /ZnIn 2 S 4 composite microstructures show the highest degradation rate of 0.1989 s −1 under visible light irradiation, 1.7 times of bare ZnIn 2 S 4 . Moreover, the MoS 2 /ZnIn 2 S 4 showed excellent stability during photocatalytic recyclable processes. This work encourages researchers to remove Cr(VI) by constructing effective heterojunction structures.

Infrared-light-driven self-healing MoS2/polyvinyl alcohol hydrogel with simultaneous enhancement of strength and ductility

H.T. Zheng,Y.C. Zhang,X. He,H.H. Liu,A.Y. Chen,X.F. Xie

Self-healing hydrogels exhibit special self-healing or self-recovery function like human skin after injuring, thereafter, draw lots of attention in biomedical applications. However, self-healing hydrogels with strong mechanical and rapid self-healing properties are not fully realized. MoS 2 /polyvinyl alcohol (PVA) hydrogels are developed to achieve rapid self-healing function by utilizing the excellent photothermal conversion effect of MoS 2 under near-infrared (NIR) light. Effects of microstructure and content of MoS 2 on self-healing and mechanical properties of MoS 2 /PVA hydrogels are investigated, including flower-like MoS 2 spheres by bottom-up hydrothermal reaction and MoS 2 sheets by liquid-phase stripping method. The MoS 2 /PVA hydrogels embodied with the two types of MoS 2 were produced by simple freezing/thawing method, and exhibited rapid self-healing function, together with simultaneous enhancement of strength and ductility. The MoS 2 /PVA hydrogel modified by flower-like MoS 2 spheres with a content of 0.5 wt% presents a significant self-healing function with a healing efficiency up to 90.0% within 5 min, and an enhancement of tensile strength of 9.1 MPa (190% to blank PVA) and a ductility of 162.5% (290% to blank PVA). Furthermore, the MoS 2 /PVA gel with flower-like MoS 2 spheres into the PVA networks produces a significant enhancement of fracture strength (58.4 MPa) after fully curing, characterized by an increases of 612% compared with the pure PVA. The photo-induced self-healing and strengthening effects of the MoS 2 /PVA hydrogels are discussed.

Composite of g-C3N4/ZnIn2S4 for efficient adsorption and visible light photocatalytic reduction of Cr(VI)

Hu Jie,Lu Songhua,Ma Jianfeng,Zhu Fang,Komarneni Sridhar

In this paper, the g-C 3 N 4 /ZnIn 2 S 4 composite was synthesized by a two-stage hydrothermal method. The microstructure, surface, and optical properties of the composite were thoroughly characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area analysis, and UV-Vis absorption spectroscopic analysis. The removal capacity of Cr(VI) was optimized by using ZnIn 2 S 4 loaded in the composite. Meanwhile, the optimal pH environment for the reduction of Cr(VI) was determined to be about pH 3, and the reduction efficiency could reach more than 99% within 60 min. Further, the results of UV-Vis absorption analysis indicated the high and wide range of light absorption by composite compared with pure g-C 3 N 4 . Therefore, the enhanced photocatalytic performance of the composite could be attributed to the well-matched energy band structure between g-C 3 N 4 and ZnIn 2 S 4 , which apparently promoted the effective separation and transfer of photogenerated carriers. In addition, the composite showed good stability in the visible light catalytic reaction, and the possible mechanism of the photocatalytic activity of Cr(VI) reduction by the composite was proposed.

Blue-Light-Excited Lead-Free Double Perovskite Cs2Ag0.6Na0.4In0.8Bi0.2Cl6/xKBr(KI) at Room Temperature and Photovoltaic Applications

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.

Light-Irradiated Thermal Energy-Promoted Selective Phenol Hydrogenation on Cellulose-Supported Palladium Catalyst with Green Hydrogen

Peijing Guo,Shaoyu Yuan,Chenyang Yu,Zhangyi Xiong,Yushan Yang,Jianlong Du,Yaguang Li,Yongjun Gao

The energy and environmental crises urge us to develop a green and sustainable catalytic strategy to achieve chemical transformation. Thus, light-irradiated thermal energy, green hydrogen generated from water electrolysis, and natural cellulose were combined into a catalytic system for phenol hydrogenation to cyclohexanone in this article. The cellulose containing abundant hydroxyl groups improves the catalytic activity of palladium nanoclusters supported on it and hinder the overhydrogenation of cyclohexanone to cyclohexanol. DFT calculations and control experiments demonstrate that the existence of glucose (the monomer of cellulose) on a Pd surface facilitates the dissociative adsorption of phenol on a catalyst and deactivates the hydrogenation of cyclohexanone to cyclohexanol, which further clarifies the higher catalytic activity and better selectivity of Cel-1Pd. More importantly, the selective hydrogenation of phenol to cyclohexanone can be conducted smoothly in a photothermal reactor under irradiation of a xenon lamp, effectively facilitating the benign conversion between light, thermal, and chemical energies.

Excited-state geometry relaxation of pyrene-modified cellulose nanocrystals under UV-light excitation for detecting Fe3+

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.

Transparent and shape-memory cellulose paper reinforced by vitrimer polymer for efficient light management and sustainability

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.

Inkjet Printing Efficient Defined-Pixel Matrix Perovskite Light-Emitting Diodes with a Polar Polymer Modification Layer

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.

Tumor pH-Responsive Nanocarriers With Light-Activatable Drug Release for Chemo-Photodynamic Therapy of Breast Cancer

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.

Enhancing Optical Performance for White Light-Emitting Diodes Using Quantum- Dots/Boron Nitride Hybrid Reflective Structure

Zhaoshu Cai,Guanwei Liang,Yunlong Zhang,Caiman Yan,Yaoxing Song,Jiasheng Li,Zongtao Li

LaNbON2 mesoporous single crystals with expedited photocarrier separation for efficient visible-light-driven water redox reactions

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).

Flexible g-C3N4-based photocatalytic membrane for efficient inactivation of harmful algae under visible light irradiation

Dongxu Wang,Juan Chen,Huinan Che,Peifang Wang,Yanhui Ao

Development of immobilized composite photocatalysts for efficient inactivation of algal cells is important because of the features of easy recycling and high stability. Herein, ultrathin g-C 3 N 4 (SCN) are embedded into cellulose acetate (CA) matrix to form CA/SCN composite membranes. The obtained photocatalytic membranes exhibit the properties of thickness uniformity, flexible and higher light absorption compared to the bulk one. Under visible light, 92% of algal can be removed by the optimal CA/SCN photocatalytic membrane (CA/SCN-200). During photocatalytic algal inactivation, algal cells occur photosynthetic activity decrease, antioxidant system collapse and membrane damage. In addition, algal organic matters and MC-LR can also be removed during the photocatalytic process. More importantly, large area membrane which also exhibits high algal removal performance can be prepared easily. This work provides a new way to develop high performance photocatalytic membranes for algal removal.