Aggregate
·
2021
·Vol. 3
·期 2
·e147
·
IF 0
Bingyan Han,Qifang Yan,Ze Xin,Qingdong Liu,Dan Li,Jiao Wang,Gaohong He
Nonconjugated polymer dots (PDs) without largely conjugated structures entitle their advantages such as environment friendliness, nontoxicity, and intrinsic fluorescence. However, color-tunable PDs remain a challenge. Herein, polyvinyl pyrrolidone (PVP) and ascorbic acid (AA) are used to synthesize nonconjugated PDs, namely, PA PDs with intensive blue emission. The introduction of a third component, m-phenylenediamine (MPD), redshifted the emission to green. The as-prepared color-tunable blue to green emissive PDs exhibit excellent properties, whether in solution or in solid state, originated from the mechanism of clustering-triggered emission (CTE) induced by the overlap of electron-rich atoms, the strong inter/intrachain interaction. The quantum yields of blue and green PDs reached up to 15.07% and 28.22%, respectively. Furthermore, PA PDs were successfully applied to the highly efficient photocatalytic degradation for dyes: methylene blue (MB) and methyl orange (MO) were degraded by 89.9% and 93.8% within 20 min under visible light, respectively.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Anjli Sharma,Sanjeev Kumar Kanth,Shishi Xu,Ni Han,Lei Zhu,Lele Fan,Chao Liu,Qinfang Zhang
A highly potential visible light active g-C 3 N 4 /Bi 4 NbO 8 X (Cl, Br) heterojunction photocatalysts were constructed at the interface of the coupling between Bi 4 NbO 8 X (Cl, Br) and g-C 3 N 4 . The band gap value of heterojunctions g-C 3 N 4 /Bi 4 NbO 8 Br-20% (CNBNB-3), g-C 3 N 4 /Bi 4 NbO 8 Cl-20% (CNBNC-3), and pristine materials g-C 3 N 4 (CN), Bi 4 NbO 8 Cl and Bi 4 NbO 8 Br were analyzed to be 2.68 eV, 2.69 eV and 2.74 eV, 2.46 eV and 2.48 eV, respectively. The degradation performance of optimized CNBNC-3 and CNBNB-3 photocatalysts revealed much superior removal efficiency of 97% and 84% than the pristine material for rhodamine B. The synthesized photocatalysts maintained good recyclable stability after five consecutive cycles and potentially capable of pollutant degradation. The electrochemical impedance and photoluminescence spectroscopy revealed that the migration and separation efficiency of photogenerated charge carriers of photocatalyst were boosted, while reduced recombination rate was observed. The photocatalytic reaction mechanism also revealed the superoxide ·O 2 − and • OH radicals are the main active species responsible for the pollutant degradation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14128-14136
·
IF 2.478
Song Fengmin,Zhang Gongguo
A series of double-perovskite orange–red-emitting Ca (3−2 x ) Sm x Na x TeO 6 ( x = 0.01–0.25) phosphors have been synthesized via high-temperature method. The single-phase and orthorhombic structure of Ca 3 TeO 6 :Sm 3+ , Na + phosphors was confirmed by X-ray powder diffraction. Under 405 nm excitation, Ca 3 TeO 6 :Sm 3+ , Na + phosphors emitted a series of orange–red emission due to the transition of Sm 3+ from 4 G 5/2 to 6 H J/2 ( J = 5, 7, 9, and 11). The optimal Sm 3+ -doping concentration of Ca (3−2 x ) Sm x Na x TeO 6 ( x = 0.01–0.25) was x = 0.10. The thermal-quenching temperature of Ca 3 TeO 6 :0.10Sm 3+ , 0.10Na + phosphor was above 480 K. A white light-emitting diode (w-LED) based on 410 nm UV chip was successfully fabricated, and it presented a good correlated color temperature and a high color-rendering index (R a ). Therefore, orange–red-emitting Ca 3 TeO 6 :Sm 3+ , Na + phosphors have potential applications in UV-based w-LEDs.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 2
·339-349
·
IF 5.693
Lin Chunling,Liu Boyang,Pu Liuyue,Sun Yan,Xue Yanli,Chang Mulan,Li Xin,Lu Xingyu,Chen Rong,Zhang Jiaoxia
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by hydro-thermal method and calcination using melamine as precursors. The morphology and chemical structure of the prepared photocatalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), SEM, UV-vis, and photoluminescence analysis (PLA). At last, the photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to remove fluoride under simulated visible light were evaluated. Results showed that the fluoride removal rate of the prepared g-C 3 N 4 /TiO 2 was about three times than pure g-C 3 N 4 due to the rapid charge transfer and the efficient separation of photogenerated electron-hole pairs in heterojunctions between g-C 3 N 4 and TiO 2 . Graphical abstract Heterojunction g-C 3 N 4/ TiO 2 display the excellent fluoride removal rate due to the rapid charge transfer and efficient separation of electron-hole pairs.
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高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
·
2021
·Vol. 25
·期 04
·298-306
·
IF 1.811
Dingwa Zhang,Xueren Huang,Jiangen Huang,Yuting Li,Jinhua Cai
Porphyrin nanostructures are widely used in the field of visible light catalysis due to their superior light absorption properties and good controllability in size, shape and function. In this paper, the development of various morphologies in three types of porphyrins with three different phenyl substituents (designated as H 2 TTP, H 2 TPP and H 2 TCPP, respectively) is demonstrated. The formation mechanism proposed was based on the evolution of morphology as functions of molecular structure and solvent mixture. These nano/micro assemblies are well characterized by SEM, IR, UV-vis, X-ray diffraction and photoelectric conversion. The photocatalytic oxidation reactions under visible light irradiation of 1,5-dihydroxynaphthalene (DHN) in water is utilized to evaluate the photoactivity of the as-prepared porphyrin assemblies. The photocatalytic results indicate that the obtained porphyrin assemblies exhibit enhanced visible-light photocatalytic activity. In addition, the photocatalyst is easy to separate and recover, and has good stability. The possible photocatalytic degradation mechanism of DHN by the porphyrins nanopolyhedron photocatalyst was also proposed.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Zhaohui Wu,Zhongfu Li,Min Wu,Jie Shen,Wenhui Feng,Xue Li,Difa Xu,Shiying Zhang,Nan Ma
It is inevitable to form invalid Type I heterostructure of BiOCl/bismuth-based photocatalysts due to the wide bandgap of BiOCl , which could only transfer the charge carriers efficiently, rather than separate. Herein, two-dimensional (2D) Type I van der Waals heterostructure of BiO 2-x /BiOCl nanosheets were prepared through a solvothermal route, and massive defects and multiple pores were in-situ constructed on the BiO 2-x /BiOCl nanosheets simultaneously. The defective and porous van der Waals structure of BiO 2-x /BiOCl ultrathin nanosheets possessing enhanced internal electric field , induced defect level, and reduced interfacial barriers, promoting both efficient transfer and separation of charge carriers. Furthermore, the massive defects of BiO 2-x /BiOCl porous nanosheets provided higher reactivity owing to its more hydrophilic surface . As a result, the BiO 2-x /BiOCl nanosheets boosted the photocatalytic performance of Cr (VI) reduction and Rhodamine B (RhB) degradation when employing LED as simulated solar light. Based on the results, a plausible photocatalytic mechanism of Cr (VI) removal and RhB photodegradation was illustrated. We expected that this work could provide a feasible route to design distinctive heterostructure photocatalysts for improved photocatalytic performances under simulated solar light.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Wenting Guo,Jiaojiao Li,Yuanyuan Yang,Meng Zhang,Yunpu Zhai,Donghui Li,Hao Zhao,Yonggang Liu
In this study, broad-spectral-responsive photocatalysts O-doped g-C 3 N 4 /Red P (OCN/RP) heterojunctions were prepared by mechanical grinding at room temperature, which is a simple and green synthesis process. The OCN nanosheets are fixed on the red P particles to form intimate I-type heterojunctions . The OCN/RP heterojunctions show extended excitation wavelength to 700 nm and enhanced photocatalytic activity against organic pollutant malachite green (MG). The enhancement benefits from the migration of photogenerated e − from OCN to RP, which facilitates effective charge separation at the interface between OCN and RP. ‧O 2 − , and ‧OH are proved to be the main active substances of MG photo-degradation on OCN/RP. This experiment provides a general strategy for the preparation of non-metal photocatalysts with broad-spectral responsibility and improved catalytic activity.
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高影响因子
Coatings
·
2021
·Vol. 11
·期 7
·816
·
IF 2.881
Ziang Xu,Guiying Xu,Beibei Han,Kun Wang,Hui Ge,Baigang An,Dongying Ju,Maorong Chai,Lixiang Li,Weimin Zhou
To provide an effective method of green aquaculture, the photocatalysts of CuO/ZrO2/CB/coal-tar-pitch-SAC, which have visible light sterilization capacity, were successfully fabricated by coating ZrO2and CuO on the surface of CB/coal-tar-pitch-SAC. The structures of synthesized CuO/ZrO2/CB/coal-tar-pitch-SAC were investigated by XRD, XPS and SEM measurements in detail. It was observed that CuO/ZrO2/CB/coal-tar-pitch-SAC materials possess obvious heterojunction structure and excellent visible light sterilization capacity when the prepared weight ratio of CuO, ZrO2and CB/coal-tar-pitch-SAC is controlled as 0.03:0.3:1. Our studies can provide a beneficial reference for the design of photocatalysts with sterilization capacity in visible light.Keywords:photocatalyst;heterojunction;coal tar pitch;green aquaculture;ZrO2
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Hongbo Lu,Chunli Wang,Xueming Liu,Jing Zhang,Zhang Lin,Zhengping Hao,Gang Pan
Arsenic sulfide sludge (ASS) is a typical precipitation product of acid smelting wastewater. Previous study reported that when exposed to sunlight, the release and oxidation of As(III) in ASS were markedly accelerated. However, the key factor to trigger the photocatalytic transformation of ASS is still unclear. Herein, we revealed that the coexisting Fe(II)/Fe(III) ions were critical to promote the photo-oxidation of released As(III) under visible light. We further validated that Fe(II)-stimulated photo-oxidation mechanism of As(III) in ASS was pH-dependent. In acid conditions, OH and SO 4 − were promoted by Fe(II)/Fe(III) cycling catalysis with the assistance of the reductive sulfur species from ASS, e.g. S 2− and SO 3 2− , and thus accelerated the oxidation of As(III). While in neutral conditions, the nascent ferric hydroxide colloids enhanced the oxidation rate of As(III) via photo-induced ligand-to-metal-charge transfer (LMCT) mechanism. These findings help in predicting and controlling the fate of real arsenic-containing sludge in sunlit environments.
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CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Jing Wang,Shuping Xu,Houyu Zhang,Lei Chen,Shulin Guan,Weiqing Xu
A novel strategy for constructing the organic core–shell structures/heterostructures (OCSHs) was developed by the surface doping of a charge transfer (CT) Py-TFP cocrystal (Py = pyrene; TFP = tetrafluoroterephthalonitrile) with the donor (D) or acceptor (A) replacement reaction. The lattice-selective doping of Pe (Pe = perylene) or TCNB (TCNB = 1,2,4,5-tetracyanobenzene) molecules on the Py-TFP surface resulted from both the molecular size match/mismatch and the distribution of the intermolecular hydrogen bonds. Spectroscopic analyses disclosed that the components of two types of lattice-oriented external shells, (Py-TFP)1–x(Pe-TFP)x and (Py-TFP)1–y(Py-TCNB)y, have the doping ratios of 0 < x ⩽ 2.00% and 0 < y ⩽ 4.03%, respectively. Their di-block core–shell heterostructures display the spatially segregated yellow-blue dual-color emission and the position-dependent optical waveguide with active and passive waveguide modes. Meanwhile, the Pe doped Py-TFP core–shell cocrystal presents (1,0,0) and (0,1,1) lattice-dependent emission and lightwave transmission. This study provides an effective fabrication strategy for the OCSH construction, and this core–shell cocrystallized heterojunction can be available for photonic and optoelectronic functional applications.
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ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Ya Chen,Xiaojuan Liang,Jianping Liu,Suqin Chen,Weidong Xiang
All-inorganic CsPbX3 perovskite nanocrystals (PeNCs) are being investigated intensively as a promising optoelectronic material. However, the issues of its intrinsic instability and toxicity restrict their commercial applications. Herein, we proposed a facile method to improve the stability of CsPbX3PeNCs by encapsulating in a superhydrophobic polymer poly(styrene–ethylene–butylene–styrene) (SEBS) matrix. The blue–green–red emission CsPbX3@SEBS (X = Cl/Br, Br, Br/I) composite films exhibit high stability against moisture and are thermally stable. It is worth noticing that the photoluminescent quantum yield (PLQY) of the CsPbBrI2@SEBS composite film can reach 60%. The SEBS polymer matrix not only protects the PeNCs from contact with the ambient surroundings but also inhibits the escape of lead ions. Notably, the CsPbX3@SEBS flexible films were used as color conversion materials to construct a light-emitting diode (LED) device, and the device exhibits a wide color gamut (113% of the National Television System Committee (NTSC)). This work demonstrates the potential of using CsPbX3@SEBS flexible films as highly efficient color conversion materials for white LED and backlight displays.
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高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 33
·2101797
·
IF 30.849
Tonghan Zhao,Jianlei Han,Yonghong Shi,Jin Zhou,Pengfei Duan
Metal–organic frameworks (MOFs) have attracted tremendous attention for several novel applications. However, functional MOFs with light-responsive circularly polarized luminescence (CPL) are not examined in detail. Therefore, a dual CPL switch exhibiting both upconversion (UC) and downshifting (DS) CPL in the solid state is constructed by loading a luminescent diarylethene derivative (DAEC) and UC nanoparticles (UCNPs) into chiral MOFs. The chiral MOF⊃DAEC composites exhibit both photoswitchable luminescence and DS-CPL properties under alternating UV and visible light irradiation. Additionally, a reversible UC-CPL switch is realized using near-infrared (NIR) and visible light irradiation by introducing energy-level-matched UCNPs and DAEC into the chiral MOFs. The dissymmetry factor ( g lum ) of UC-CPL is noted to be significantly amplified through energy transfer compared to that of DS-CPL, which indicates that the information on circular polarization can be manipulated by altering the incident light. A chiroptical logic circuit with a 2D information output is designed with UV, visible, and NIR light as inputs by setting a rational threshold.
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高影响因子
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