Journal of Materials Chemistry C
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2020
·Vol. 8
·期 39
·13603-13611
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IF 7.059
Shufang Wu,Wenbo Li,Junjie Hu,Peng Gao
Recently, compositional engineering of lead-free halide double perovskite materials (A2B+B3+X6) has attracted increasing research interest in terms of potential optoelectronic applications. Herein, antimony (Sb3+) ions are introduced to manipulate the structure and optical properties of Cs2NaBiCl6. Within the substitution range of 30%, the alloyed Cs2NaBi1−xSbxCl6 crystals maintain the pure double perovskite phase while exhibiting a gradually decreasing band-gap. Through controlled oxidation of Sb3+ ions, the samples, even at low alloy levels, show enhanced visible light absorption. An apparent color change from yellow to brown can be observed and ascribed to the increase of defect states. Meanwhile, the emissions of Cs2NaBi1−xSbxCl6 crystals turned gradually from the broad-band orange-red region to the blue-green region with the increase of the Sb3+ content. The dual-emission phenomenon can be attributed to the radiative recombination of self-trapping excitons activated by the excitation energy from the host lattice. This study augments the frontiers of halide double perovskites and deepens the understanding of optoelectronic tuning by atomic substitution. New possibilities in photovoltaics and white light emission applications could be envisioned.
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ADVANCED POWDER TECHNOLOGY
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2020
·
IF 4.217
Chonghai Deng,Hanmei Hu,Hong Yu,Man Wang,Mengyi Ci,Lili Wang,Sane Zhu,Yiping Wu,Huirong Le
One-dimensional (1D) hierarchically structured CdS nanoparticles (NPs)/NiO nanofibers (NFs) heterostructures with remarkable removal efficiency for diazo dye Congo red (CR) were fabricated by a stepwise synthesis process, which was involved a chemical bathing deposition combined with calcination, and a microwave-assisted wet chemical reaction. The crystal phases, morphologies, optical absorption properties, and adsorption/photocatalytic activity of as-prepared products were investigated by XRD, FESEM, TEM, high-resolution TEM (HRTEM), N 2 adsorption/desorption isotherms, UV–Vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectrum respectively. The experimental results indicated that binary satellite- core CdS NPs/NiO NFs heterojunctions are comprised of n-type CdS NPs with size of 10–30 nm decorated onto 1D p-type NiO NFs with diameter of 60–180 nm and length up to microns, which are self-assembled by nanoparticles with 30–100 nm in size. The possible formation mechanism for satellite-core structured CdS/NiO heterojunction is proposed. Interestingly, the decolorization efficiency over CdS/NiO heterostructures reached up to 91.2% in removal of aqueous CR at high concentration within 40 min under visible light irradiation, which was approximately 5.2 and 3.8 times as high as that of pure CdS nanocrystals (NCs) and the mixture of NiO NFs and CdS NCs. Furthermore, the possible photocatalytic mechanism was also investigated. The as-designed hybrid CdS NPs/NiO NFs heterostructures exhibited improved photocatalytic activity, which is attributed to the enhancement of the visible light adsorption, the efficient separation of photogenerated electrons and holes, and the high adsorption capacity towards CR molecules, thereby displaying superior visible- light-driven photodegradation of CR in high concentration. This work may provide a green engineering heterojunction technology to develop the advanced multifunctional nanocomposites for their applications in wastewater purification.
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Environmental Progress & Sustainable Energy
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2020
·Vol. 40
·期 1
·e13479
·
IF 1.989
Zhengjiang Liu,Anqi Wang,Qiancheng Zhang,Juming Liu,Huiyan Ma,Di Li,Lei Xing
Sensitized kaolinite with improved visible-light catalytic activity was prepared via a facile in-situ growth of nanosized Cu-TiO 2 on the surface of the sulfated kaolinite impregnated in Cu-TiO 2 sol. The as-prepared photocatalysts were characterized in terms of various techniques. The transmission electron microscope and energy dispersive spectrometer results revealed that Cu-TiO 2 could grow on the surface of the pretreated kaolinite and the aggregation of Cu-TiO 2 was successfully inhibited. The X-ray photoelectron spectrum confirmed the formation of Al O Ti bonds between Cu-TiO 2 and sulfated kaolinite in the sensitized kaolinite composite. The sensitized kaolinite composite exhibited significantly improved performance in the degradation of Rhodamine B (RhB), leading to about 87% of RhB degradation in 180 min, which is superior to that of the kaolinite, calcined kaolin, and sulfated calcined kaolin under visible-light irradiation. The superior photodegradation activity of the sensitized kaolinite composite was primarily attributed to the synergetic effect of Cu-TiO 2 sensitization and sulfation, resulting from the efficient transfer and separation of the photo-induced charge carriers between Cu-TiO 2 and kaolinite.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Xuesong Zhao,Yingying You,Shaobin Huang,Yixiao Wu,Yiyang Ma,Guan Zhang,Zhenghua Zhang
Photocatalytic production of hydrogen peroxide from water and oxygen is a promising technique due to the green and sustainable solar-to-chemical energy conversion. However, in the absence of organic sacrificial agents as electron donors, the relatively low photocatalytic H 2 O 2 productivity is still far from satisfactory. Herein, we present a Z‐scheme photocatalytic production of hydrogen peroxide over Bi 4 O 5 Br 2 /g-C 3 N 4 heterostructure under visible light without additive organics. The obtained Bi 4 O 5 Br 2 /g-C 3 N 4 heterostructure exhibited a highest H 2 O 2 production of 124 μM in 60 min by a Z-scheme photocatalytic mechanism. The photoinduced electrons of Bi 4 O 5 Br 2 combine with the holes of g-C 3 N 4 at the contact interface, and the e − and h + of the heterostructure are mainly derived from the conduction band of g-C 3 N 4 and valence band of Bi 4 O 5 Br 2 , respectively. As such, more e − and h + of Bi 4 O 5 Br 2 /g-C 3 N 4 heterostructure are available to reduce oxygen and oxidize water, respectively, with more ·O 2 − and ·OH generated and thus more H 2 O 2 produced.
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APPLIED ORGANOMETALLIC CHEMISTRY
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2020
·Vol. 34
·期 11
·e5932
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IF 3.14
Yanming Jia,Junwen Wang,Kan Zhang,Chuanmin Ding
A highly shape-selective and relatively long-lifetime HZSM-5-based catalyst (Zn-2P/HZSM-5) was prepared by chemical modification with both ZnSiF 6 ·6H 2 O and H 3 PO 4 solution. The phosphoric acid modification could effectively modulate the Brønsted acid strength of the HZSM-5 catalyst, which promotes the oligomerization, alkylation, cyclization, and hydrogen transfer reactions. The introduction of Zn-Lewis acid sites significantly improved the dehydroaromatization of higher olefins. All of these were very beneficial for the generation of BTX (i.e. b enzene, t oluene, and x ylene) hydrocarbons in aromatization of methanol. The coke amount and the average rate of coke formation decreased over the Zn-2P/HZSM-5 catalysts, which may largely be ascribed to its lower strong acid sites and lower outer surface acidity. The catalytic performance of methanol aromatization showed that the Zn-2P/HZSM-5 catalyst exhibited the highest BTX selectivity of about 46.76% and the longest catalytic lifetime of about 498 h at T = 400 °C, P = 0.1 MPa, and weight hourly space velocity = 0.7 h −1 .
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APL Materials
·
2020
·Vol. 8
·期 7
·
IF 3.819
Jiang Jintian,Wang Daoyuan,Wu Mingfang,Peng Ping,Li Fang-Fang,Liu Faqian,Jing Renwei,Ma Xuedan,Chao Yan,Xiao Zhili,Jiang Qinglong
Cs 4 PbBr 6 crystals have been synthesized by an ultrasonication-assisted trace amount polar solvent method. The prepared green Cs 4 PbBr 6 material was found to have high photoluminescence (PL) brightness and 10 ns PL lifetime. The prepared green light emitting device can achieve the maximum brightness of 3.8 × 10 9 cd/m 2 , which is nearly 100 times higher than a wick. The white light emitting device based on Cs 4 PbBr 6 crystals has better performance than commercial products, which can cover 32.3% of the color gamut and achieves 107.3% coverage for International Commission on Illumination (CIE)1931 and 84.8% coverage for CIE1976.
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ENERGY
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2019
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IF 5.537
Liang Jiang,Yuan Lei,Qinfeng Liu,Jingxin Lei
Except for the improvement enthalpy value and thermal conductivity of conventional solid-solid phase change materials (SSPCMs), expansion of additional functions other than thermal energy storage function of that has been particularly attractive. In this work, a novel self-luminous SSPCMs based polyethylene glycol have been successfully synthesized via incorporation of long afterglow luminescence (LAL) particles into SSPCMs in the absence of any isocyanates and solvents. The prepared self-luminous SSPCMs have high melting latent heats with a maximum value at 120.2 J g −1 , maximum encapsulation ratio of 80.6%, and a suitable phase change temperature around 28 °C. Importantly, the prepared self-luminous SSPCMs with different concentrations of LAL particles can absorb and store visible light sources in the daylight but can slowly release blue light in the dark over a long time. Furthermore, the prepared self-luminous SSPCMs after thermal cycling tests and storing-releasing light energy cycling tests have preeminent thermal reliability, luminescence repeatability and chemical structure reliability for a long time practical application.
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APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Marimuthu Karpuraranjith,Yuanfu Chen,Xinqiang Wang,Bo Yu,Sivamoorthy Rajaboopathi,Dongxu Yang
It is still challengeable to develop low-cost metal-based photocatalysts with high efficiency and stability for organic pollutant degradation. Herein, we propose a novel “interfacial engineering and suitable band gap matching” strategy to synthesize hexagonal SnSe nanoplate supported SnO 2 -CNTs for highly efficient photocatalytic activity. The CNTs-SnO 2 /SnSe, constructed by SnO 2 nanoparticles homogeneously embedded in carbon nanotube surface, which is anchored on hexagonally crystalline SnSe nanoplates, is synthesized by a facile low-cost and eco-friendly one-pot solvothermal reaction. Compared to SnO 2 , SnSe, CNTs-SnO 2, SnO 2 /SnSe, the CNTs-SnO 2 /SnSe delivers significant performance, enhancement in photocatalytic degradation for aqueous organic dye pollutant under visible light irradiation in 60 min. The k value of CNTs-SnO 2 /SnSe is over 2.2 times larger than CNTs-SnO 2 , SnO 2 and SnSe. The remarkably enhanced photodegradation performance of CNTs-SnO 2 /SnSe is mainly attributed to its unique nanoarchitecture, high surface area and band gap matching: the CNTs skeleton can facilitate the electron transfer; band gap diagram of CNTs-SnO 2 /SnSe is beneficial to efficient electron-hole charge separation and recombination of electron-hole pair can be effectively suppressed. This work presents a rational catalyst design with nanoarchitecture and band gap matching, and a facile one-pot synthesis strategy to synthesize low-cost photocatalysts for dye pollutant degradation with prominent high-efficiency and long-term stability.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Fanghao Ye,Huijun Zhang,Pang Wang,Wei Li,Donghui Li,Baocai Du,Dan Liu,Tao Wang
Two-dimensional (2D)/three-dimensional (3D) perovskites have been successfully applied in high-efficiency light-emitting diodes (LEDs) because of their large exciton binding energy (Eb) caused by the quantum and dielectric confinements. Thermal annealing and antisolvent treatments are usually executed in order to promote the crystallization and film quality of perovskites, which add complexity to the device fabrication process. Here, the cesium-based 2D/3D perovskite was prepared by introducing ammonium halide benzamidine hydrochloride (BMCl) as the additive. By further introducing an appropriate amount of MABr and PbBr2, BM2(Cs1–xMAxPbBr3)n−1PbBr4 crystals can be formed rapidly without any additional treatments, while inhibiting the formation of the unfavorable Cs4PbBr6 phase. The optimized 2D/3D perovskite-based LEDs achieved a maximum luminance of 12 367 Cd/m2, a current efficiency of 17.4 Cd/A, and an external quantum efficiency of 5.2%. Our results suggest that appropriate perovskite crystallization can be achieved at room temperature by the regulation of precursor solution, making the perovskite crystallization process easier to control with reduced processing complexity.
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ACS Nano
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2019
·
IF 13.903
Jingwen Xu,Ning Liu,Di Wu,Zhida Gao,Yan-Yan Song,Patrik Schmuki
The low penetration depth of UV light in mammalian tissue is the critical limitation for the use of TiO2-based photocatalysis in biomedical applications. In this work, we develop an effective near-infrared (NIR)-active photocatalytic platform that consists of a shell structure of upconversion nanocrystals decorated on a core of Au/dark-TiO2. The heart of this system is the strong photocatalytic activity in the visible region enabled by the gold surface-plasmon resonance on dark TiO2 (D-TiO2). Simulation and experiment demonstrate for an optimized Au/D-TiO2 combination a highly enhanced light absorption in the visible range. Using ampicillin sodium (AMP) as model drug, we exemplify the effective use of this principle by demonstrating a NIR light-triggered photocatalytic payload release. Importantly, the photocatalytically generated reactive oxygen species can effectively inactivate AMP-resistant bacteria strains, thus maintaining an antibacterial effect even after all drug is released. Overall, we anticipate that the here-introduced NIR-light-active photocatalytic cascade can considerably widen TiO2-based photocatalysis and its applications into the infrared range.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yawei Wang,Shunhang Wei,Xiaoxiang Xu
Solid solutions between SrTaO 2 N and CaTaO 2 N, i.e. Sr 1-x Ca x TaO 2 N (0.0 ≤ x ≤ 1.0) were synthesized and investigated as photocatalysts for water oxidation and reduction. A wealth of important parameters such as Ta-(O, N) bond length, Ta-(O, N)-Ta bond angle, band gap and band edge positions can be successively tuned by varying Sr/Ca molar ratios at A site. These solid solutions work well as photocatalysts to drive water splitting reactions under visible light illumination which clearly outperform their parent compounds SrTaO 2 N and CaTaO 2 N. Apparent quantum efficiency as high as 1.67% at 420 ± 20 nm was achieved on Sr 0.4 Ca 0.6 TaO 2 N (x = 0.6) which stands as the highest one reported for SrTaO 2 N and CaTaO 2 N to date. This simple approach by cation control at A site serves as a useful tool to tailor photocatalytic properties of perovskite oxynitrides, opening new playgrounds for the design and development of these tempting compounds as efficient photocatalysts.
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COLORATION TECHNOLOGY
·
2019
·Vol. 136
·期 1
·15-22
·
IF 1.241
Lili Wang,Xiaying Jiang,Chenglong Wang,Yi Huang,Yiding Meng,Jianzhong Shao
To improve the properties of titanium dioxide particles and realise their firm anchorage in blue light curing film, three modified titanium dioxide particles were prepared by grafting 3-(trimethoxysilyl)propyl methacrylate, 3-aminopropyltriethoxysilane and hexadecyltrimethoxysilane. The surface changes of titanium dioxide particles after modification were characterised. The dispersion stability, photo-polymerisation, rheological and mechanical properties of modified titanium dioxide blue light curing inks were investigated. Results showed that compared with native titanium dioxide, modified titanium dioxide particles were more appropriate for blue light curing ink. The particle sizes of the three modified titanium dioxide particles became smaller, their surfaces exhibited hydrophobicity, and the viscosity of the modified titanium dioxide inks decreased slightly. Of the three modified titanium dioxide particles, 3-(trimethoxysilyl)propyl methacrylate- and hexadecyltrimethoxysilane-modified titanium dioxide particles exhibited better dispersion stability in blue light curing ink. In particular, 3-(trimethoxysilyl)propyl methacrylate-modified titanium dioxide blue light curing ink showed the best photo-polymerisation and mechanical properties, which indicated the participation of the pigment grafted by double bonds in the blue light curable polymerisation. Using modified titanium dioxide in blue light curing ink, the dry/wet rubbing fastness of the printed fabrics improved.
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