Nature Energy
·
2019
·Vol. 4
·期 7
·575-584
·
IF 54
Luo Nengchao,Montini Tiziano,Zhang Jian,Fornasiero Paolo,Fonda Emiliano,Hou Tingting,Nie Wei,Lu Jianmin,Liu Junxue,Heggen Marc,Lin Long,Ma Changtong,Wang Min,Fan Fengtao,Jin Shengye,Wang Feng
Photocatalytic hydrogen production from biomass is a promising alternative to water splitting thanks to the oxidation half-reaction being more facile and its ability to simultaneously produce solar fuels and value-added chemicals. Here, we demonstrate the coproduction of H 2 and diesel fuel precursors from lignocellulose-derived methylfurans via acceptorless dehydrogenative C−C coupling, using a Ru-doped ZnIn 2 S 4 catalyst and driven by visible light. With this chemistry, up to 1.04 g g catalyst −1 h −1 of diesel fuel precursors (~41% of which are precursors of branched-chain alkanes) are produced with selectivity higher than 96%, together with 6.0 mmol g catalyst −1 h −1 of H 2 . Subsequent hydrodeoxygenation reactions yield the desired diesel fuels comprising straight- and branched-chain alkanes. We suggest that Ru dopants, substituted in the position of indium ions in the ZnIn 2 S 4 matrix, improve charge separation efficiency, thereby accelerating C−H activation for the coproduction of H 2 and diesel fuel precursors.
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MRS Advances
·
2019
·Vol. 4
·期 38
·2071-2078
·
IF 0
Zhong Yong,Hu Yaoqing,Wang Jiefei,Wang Jinghan,Ren Xitong,Sun Jiajie,Bai Feng
Photocatalytic water splitting to form hydrogen can effectively alleviate energy and environmental problems attracting wide attention. However, the current photocatalysts have low photocatalytic efficiencies due to the narrow absorption spectrum, which is far from the actual application requirements. Herein, we use the as-prepared zinc porphyrin self-assemblies to visible-light-drive photocatalytic hydrogen evolution with Pt as the cocatalyst and ascorbic acid (AA) as the sacrificial agent. The results exhibit morphology-dependent performance and hexagonal stacks achieved optimal H 2 evolution rate (47.1 mmol/h/g), then followed by nanodiscs, nanorod and tetragonal stacks, meanwhile the nanorods with different aspect ratios show size-dependent properties. The UV-vis absorption and photoluminescence spectra and the shortening of decay time of the corresponding ZnTPyP aggregates reveal that the well-defined self-assembled porphyrin networks are J-aggregation and boost efficient energy transfer with respect to monomer. Such porphyrin self-assemblies are standing for one of the most promising photosensitizers in photocatalysis field and provide an important reference for designing the next generation of hydrogen production.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Hongxuan Qiu,Jiwen Hu,Run Zhang,Wenting Gong,Yichang Yu,Hongwen Gao
Nowadays, oil spills have occurred frequently, which is seriously harmful to the aquatic wildlife and the ecological environment. The photocatalysis is one important approach to degrade the diesel. The diesel floats on the water surface and is difficult to be removed by direct photocatalysis. However, floating photocatalytic composites can solve this problem. We used one facile solvothermal synthesis method to deposit the metal semiconductor (BiOI) on the expanded perlite (EP) and obtained one efficient photocatalysis nanocomposites, which could float on the water surface with good efficient adsorption and excellent degradation of the diesel. And the experimental results shows a good photocatalytic performance, which is up to 85% of removal rate of the diesel after irradiation for 2 h under simulated sunlight. In addition, this composite is a recycled material (reusing for 5 times) and eco-friendly material with low biotoxicity. As a result, the proposed combination of adsorption and photocatalysis will provide a novel strategy to greatly facilitate the treatment of diesel wastewater.
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ChemCatChem
·
2019
·Vol. 11
·期 22
·5487-5494
·
IF 4.495
Xia Yang,Chun Li,Jiangfei Wang,Jing Zhang,Fangfang Wang,Rengui Li,Can Li
Graphical On the tip of my tung : A novel bismuth tungstate nanosheets photocatalyst dispersed by graphene is fabricated through PVP assisted assembly of Bi 2 WO 6 nanostructures and simultaneously reduced graphene oxide. The well dispersion of Bi 2 WO 6 nanosheets by graphene provides enhanced separation/transfer of photogenerated charges and exposed active sites for interfacial charge transfer, giving enhanced visible light photocatalytic activity compared with other similar photocatalysts. Promoting photogenerated charge separation is the key and bottleneck step in photocatalysis, which mainly determines the efficiency of solar energy conversion. Reduced graphene oxide (rGO) has been emerging in the fields of physics, catalysis and material sciences due to its unique structures, high catalytic activity and tunability. In this work, we introduced rGO nanosheets as support to fabricate uniformly-dispersed Bi 2 WO 6 nanostructures onto the rGO surface under hydrothermal condition. The resulted rGO/Bi 2 WO 6 composite exhibited superior performances in degradation of various kinds of environmental pollutants including dyes and phenol. Further electrochemical characterizations including open circuit potential, electrochemical impedance spectroscopy and electrochemical specific area indicated that incorporation of rGO evidently accelerated the interfacial charge separation and transfer. These improvements consequently contributed to largely exposed active sites and superior photocatalytic performance. Our work presented a facile strategy to tune the interfacial charge separation in semiconductor-based photocatalysts using layered materials like graphene and its derivatives.
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CHEMOSPHERE
·
2019
·
IF 5.108
Guoshuai Liu,Guoqiang Zhang,Shuo Zhang,Yangsen Xu,Xun Yang,Xuedong Zhang
This work focuses on the photocatalytic removal of recalcitrant organic pollutants in water treatment . Based on facile precipitation reaction, we fabricated a photocatalyst (PbCrO 4 ) in single crystals that present evident response to visible light and employed the catalyst in the photocatalytic decomposition of microcystin-LR (MC-LR). In the degradation test using the nanorods with prepared PbCrO 4 photocatalyst, a 100% removal efficiency (27 min reaction) and a kinetics constant of 0.1356 min −1 were achieved. Such a high performance of PbCrO 4 in photocatalytic conversion of MC-LR was ascribed to its high carrier separation efficiency, positive valence band (VB) position, and good delocalization of VB and conduction band (CB). The test of electron spin-resonance resonance (ESR) demonstrated that excessive free OH radicals were produced during the PbCrO 4 photocatalysis of MC-LR. The density functional theory (DFT) and LC/MS/MS technology were employed to ascertain the intermediates during the MC-LR photocatalytic degradation . The major intermediates were resulted from the attack of hydroxyl radicals to the ADDA side chains of MC-LR structure. This study provides a proof-of-concept strategy to develop effective photocatalysts to efficiently produce OH radicals for the visible-light induced photocatalytic degradation of MC-LR in water.
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PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 9
·4173-4178
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IF 7.233
Hua Wu,Yu Zhang,Min Lu,Xiaoyu Zhang,Chun Sun,Tieqiang Zhang,Vicki L. Colvin,William W. Yu
Cesium lead halide perovskite nanocrystals (NCs) possess excellent optical properties at visible wavelengths with great promise for applications in luminous display fields. We demonstrate a method to modify the surface ligand passivation of perovskite NCs for enhanced colloidal stability and emitting properties by incorporating didodecyl dimethyl ammonium bromide (DDAB). The photoluminescence quantum yield of the NC solution was improved to 96% from 70% and the perovskite film showed fewer trapped sites and enhanced carrier transport ability. The thus fabricated electroluminescent perovskite NC-LEDs exhibited a bright luminance of 11 990 cd m−2, corresponding to 4-times improved external quantum efficiency (EQE), compared to the control device using regular NCs without DDAB.
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PubMed
高影响因子
Biomaterials Science
·
2018
·Vol. 6
·期 11
·2965-2975
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IF 5.831
Bin Yang,Kaiyuan Wang,Dong Zhang,Bingjun Sun,Bin Ji,Lin Wei,Zhenbao Li,Menglin Wang,Xuanbo Zhang,Haotian Zhang,Qiming Kan,Cong Luo,Yongjun Wang,Zhonggui He,Jin Sun
In the context of prodrug nanomedicines for cancer therapy, one of the great challenges is the slow and variable release of the parent drug in tumors. Recently, many smart redox-sensitive nanocarriers have been developed to address this problem. However, due to significant tumor heterogeneity, some redox-sensitive nanomedicines still show poor selectivity in drug release. Herein, we report the design and synthesis of a ROS-triggered prodrug nanoplatform fabricated with oxidation-responsive cabazitaxel (CTX) prodrugs for synergistic chemo-photodynamic therapy, thioether-/selenoether-linked conjugates of CTX and oleic acid (OA). These prodrugs can be readily self-assembled into nanoparticles, with pyropheophorbide a (PPa) co-encapsulated into the prodrug-nanosystem for combination therapy. The dual-source ROS-responsive prodrug nanosystems selectively and rapidly release CTX not only in response to endogenous ROS overproduced in tumor cells, but also to exogenous PPa-generated ROS under laser irradiation. Moreover, the selenium-containing linkage demonstrates significant advantages over a sulfur-containing linkage in terms of ROS-triggered drug release and cytotoxicity. The prepared prodrug-nanosystems significantly prolong the systemic circulation and tumor distribution of both CTX and PPa, thereby demonstrating synergistic chemo-photodynamic therapy in vivo. All these drug delivery advantages render the nanosystem extremely promising for cancer treatment.
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高影响因子
Catalysts
·
2018
·Vol. 8
·期 9
·366
·
IF 3.465
Hongwei Wang,Guiqing Huang,Zhiwei Chen,Weibing Li
In this study, we prepared carbon self-doped carbon nitride nanosheets through a glucose synergic co-condensation method. In the carbon self-doped structure, the N atoms in the triazine rings were substituted by C atoms, resulting in enhanced visible-light photocatalytic hydrogen production, which is three-times higher than that of bulk carbon nitride. The enhanced photocatalytic hydrogen production was attributed to the higher charge-carrier transfer rate and widened light absorption range of the carbon nitride nanosheets after carbon self-doping. Thus, this work highlights the importance of carbon self-doping for improving the photocatalytic performance. Meanwhile, it provides a feasible method for the preparation of carbon self-doped carbon nitride without destroying the 2D conjugated backbone structures.Keywords:carbon nitride nanosheets;carbon self-doping;photocatalytic hydrogen production;charge transfer rate
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2018
·Vol. 51
·期 40
·405103
·
IF 2.373
Xi Cheng,Chengjun Qi,Wei Ding,Jingwen Lu,Xiaoming Mo,Yulu Zhou,Tao Lin,Xiaoma Tao,Hongmei Chen,Yifang Ouyang
Organic–inorganic hybrid perovskites are emerging as promising light-emitting materials due to their superior photophysical properties. Poor surface coverage creating substantial pinholes and shunt paths, nevertheless, is one of the most severe problems that hinder the further development of perovskite light-emitting diodes (PeLEDs). Here in this work, we demonstrated a fabrication of PeLEDs by using a robust, stable, and highly transparent poly(methyl methacrylate) (PMMA) polymer to passivate the pinholes of CH3NH3PbBr3 emissive layer and hence reduce the non-radiative losses through the shunt paths formed by the pinholes. Uniform surface coverage and reduced leakage current were achieved. Green electroluminescence (EL) emission centered at ~534 nm was greatly boosted by a factor of 10 at 8 V with optimizing the thickness of the PMMA modifier. This facile and universal technique provides an effective way to circumvent the poor formation of the CH3NH3PbBr3 perovskite film and may be very helpful in the development of PeLEDs.
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ACS Applied Nano Materials
·
2018
·
IF 0
Shining Ni,Tiantian Zhou,Haonan Zhang,Yongqiang Cao,Ping Yang
By virtue of the facile anion-exchange technique, smart BiOI/BiVO4 two-dimensional (2D) heteronanostructure (HNS) photocatalysts targeted for the degradation of organic pollutants have been developed by the in situ growth of BiVO4 on the scaffolds of BiOI nanoplates. The as-obtained BiOI/BiVO4 HNSs exhibited excellent 2D structure as templates of BiOI nanoplates and well structure stability due to the in situ growth pattern of BiVO4 on BiOI. The 2D HNSs exhibited superior photocatalytic activities, especially the V/I8 2D HNSs (V:I = 80%), exhibited the highest Rhodamine B (RhB) and salicylic acid (SA) degradation rates, which are 29.8 times (RhB) and 15.7 times (SA) those of the individual BiVO4 and 6.4 times (RhB) and 10 times (SA) those of BiOI, respectively. Such excellent photocatalytic activities should be attributed to the organic combination of the 2D structure and heterojunction, as verified by the detailed morphology and composition characterizations. The well-known unique advantages of 2D nanostructures such as efficient light harvesting, quick reactant transport, exposure of plenty of surface reactive sites, and significantly reduced perpendicular migration distances of photogenerated carriers from the interior to the surface of materials, coupled with enhanced carrier separation behavior due to the built-in field at the heterointerface endow the 2D HNSs with ultrastrong photocatalytic abilities. It is hoped that our work could offer a paradigm for the development of smart 2D HNS optoelectronic functional materials used in photosynthesis, solar cells, sensors, catalysis, and so on, in the future.
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CELLULOSE
·
2018
·Vol. 25
·期 7
·4133-4144
·
IF 3.809
Geng Aobo,Meng Liang,Han Jingquan,Zhong Qiang,Li Meirun,Han Shuguang,Mei Changtong,Xu Lijie,Tan Lin,Gan Lu
Abstract There is an urgent need to explore alternatives to replace traditional carbonaceous materials because of dwindling oil reserves and increasing atomospheric carbon dioxide. In the present study, the cellulose derived carbon nanofibers (CCNF) were prepared and used to hybridize with bismuth oxybromide to prepare novel photocatalyst composites (CCNF/BiOBr). The structural properties of the prepared composites were then characterized. Afterwards, the photocatalytic performance of the CCNF/BiOBr composites was investigated through degrading rhodamine B (RhB) under continuous visible light irradiation. The results indicated that the pyrolysis process could convert the cellulose to carbon nanofiber with high graphitization degree. The photocatalytic performance of the CCNF/BiOBr composite was better than that of the pure BiOBr, which was ascribed to the introduction of the CCNF into the composite system. The present work provides a promising way to design new photocatalyst composites with desirable carbon alternatives from biomass materials for effective treatment of organic contaminants in water media. Graphical Abstract
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ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Lianwei Fan,Ke Ding,Hongting Chen,Songpo Xiang,Rui Zhang,Runda Guo,Zhitian Liu,Lei Wang
Formamidinium (FA) lead bromide (FAPbBr 3 ) perovskite nanocrystals (P-NCs) have ultrapure green emission and high stability, while FAPbBr 3 NCs based light-emitting diodes (FA-NLEDs) still have little report. Here, FAPbBr 3 NCs with a high photoluminescence quantum yield of 85.8% were synthesized. By controlling the concentration of FAPbBr 3 NCs in toluene solution, the exciton recombination region was precisely confined to the emitting layer and the parasitic emission coming from electron transport layer disappeared, resulting in the pure green emissions. The optimized FA-NLED presents a maximum external quantum efficiency (EQE), current efficiency (CE) of 3.84% and 16.08 cd/A respectively, with the EL emission peak of 528 nm, CIE of (0.183, 0.763) and a full width of half-maximum (FWHM) of 24 nm, which is among the best performance of FA-NLEDs.
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