Green Synthesis and Catalysis
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2022
·
IF 0
Hongwei Li,Yurong Zhang,Jun Tang,Guozheng Huang,Ping Cui,Qingping Ke
Developing highly efficient and recyclable photocatalysts through harvesting solar light as energy is crucial to oxidation for industrial implementation, especially for simple transition metal oxidic catalysts without precious/heavy/rare metal dopants. Herein, we like to report the use of nitrogen-doped CoMn 2 O 4 oxide ( N –CoMn 2 O 4 ) as a heterogeneous catalyst for efficient oxidation of various alcohols such as p / m / o -methyl-substituted aromatic alcohols, p -substituted aromatic alcohols including electron-donating and electron-withdrawing substituents, heterocycle-based alcohols and secondary aromatic alcohols to the corresponding aldehydes/ketones, under visible light (>420 nm) illumination and mild condition of oxygen as oxidant and room temperature. The relation of various Co-based oxides to their catalytic performance was studied. It is shown that the Co 2+ species in N –CoMn 2 O 4 , obviously increased by the doping of nitrogen, are acted as catalytic active species coupled with the synergistic effect between Co and Mn species for the enhanced visible-light selective oxidation of alcohols to aldehydes. A plausible catalytic mechanism is proposed basis of control experiments and published studies, which suggests that this oxidation process probably occurs on Co 2+ sites via an ionic reactive oxygen species pathway and 1 O 2 and O 2 · − species are the reactive oxygen species. This simple transition metal oxide-catalyzed aerobic oxidation provides a green alternative for the manufacture of aldehydes/ketones from alcohols.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Zhen Pei,Pengfei Fei,Aiqin Zhang,Jiandong Guo,Jiacheng Hao,Jing Jia,Hailiang Dong,Qianqian Shen,Liqiao Wei,Husheng Jia,Bingshe Xu
ZIF-8 has excellent antibacterial potential as an important metal organic framework (MOFs) photocatalytic material. However, ZIF-8 is greatly restricted in photocatalytic antibacterial applications due to the wide band gap and only response to ultraviolet light. In this work, the spectral response of ZIF-8 is successfully extended to the visible light region by the thermal gas sensitization treatment technology. Meanwhile, the forbidden band width of the materials is narrowed by about 47%. The results of FTIR, XPS and EDS prove that the elements and functional groups in ZIF-8 have changed, indicating the completion of the thermal gas sensitization reaction. The results of XRD and SEM show that the modification process doesn’t change the crystal structure and morphology of ZIF-8; The result of BET demonstrates that the specific surface area of ZIF-8 decreases slightly after sensitization, but it is still as high as about 1500 m²/g. Photocatalysis studies indicate that the photo-generated charge separation and transfer efficiency of ZIF-8 improve significantly and the recombination reduce substantially after thermal oxygen sensitization. Photocatalytic antibacterial performances reveal that ZIF-8 after thermo-oxygen sensitization can rapidly produce active species such as·O 2 - and h + under visible light irradiation, and the bactericidal efficiency exceed 99% against Escherichia coli and Staphylococcus aureus within 20 min. This research provides scientific basis and experimental data for the application of ZIF-8 in microbial management and health protection.
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Journal of Physical Chemistry C
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2013
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IF 4.814
Yan Yan,Yafan Wu,Yuting Yan,Weisheng Guan,Weidong Shi
Recently, the controlled synthesis of semiconductor photocatalysts has attracted intense attention. In this report, we first report the controlled synthesis of Bi2WO6 nanostructures via the soluble inorganic salt Na2SO4-assisted hydrothermal method by simply adjusting the reaction time and pH value. Four typical Bi2WO6 nanostructures were obtained, namely nestlike nanostructures assembled by nanoplates (NNS-ANPs), rodlike nanostructures assembled by nanoplates (RNS-ANPs), quantum dots-modified nanoplates (QDs-NPs), and smooth-surfaced nanoplates (SSNPs). Tentative formation mechanisms of the different morphologies based on our observations are discussed. Photocatalytic degradation results show that the degradation ratios (DRs) of three-dimensional structures are higher than those of two-dimensional structures, and surface QDs play key roles in enhancing the DR of QDs-NPs. Morphology-dependent photocatalytic activities of different Bi2WO6 nanostructures are possibly due to different charge-separation abilities, which has been demonstrated by photoluminescence analyses.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Shutao Li,Pengfei Wang,Haoxu Zhao,Rendong Wang,Ruisen Jing,Zilin Meng,Wenzhi Li,Zhilei Zhang,Yunyan Liu,Qian Zhang,Zhao Li
The novel photocatalyst capable of utilizing the full spectrum of solar energy has attracted the attention of researchers. Black phosphorus (BP), as a rising star in an assortment of 2D materials , possesses a broadband absorption due to its tunable direct bandgap, which makes it a candidate photocatalyst. In our work, poly dimethyldiallyl ammonium chloride (PDDA) is used to passivate BP nanosheets (BPNs) to improve its stability. Further, the functionalized BPNs and BiOBr are combined by a one-step co-precipitation method to form nanocomposites . The successful formation of nanocomposites obviously promoted the possibilities for the carrier transporting between BiOBr and BPNs, and effectively hindered the recombination of carriers, which is confirmed by all manner of characterization. Meanwhile, nanocomposites have enhanced light absorption and relatively large specific surface area , which also has a gain in its photocatalytic activity. The as-prepared nanocomposite photocatalysts significantly enhanced the photocatalytic activity with the best degradation effect of 14 and 3.4 times than pure BiOBr towards degradation of methylene orange (MO) and ciprofloxacin (CIP), respectively, under visible light . To get clear proofs of the photocatalytic mechanism, the UV–vis diffuse reflectance spectroscopy, photocurrents , electrochemical impedance spectra and Mott-Schottky measurements et al. were employed and the type-I band alignment was proposed. This finding provides an easily synthesis and effective way of BP/semiconductor photocatalysts and demonstrates a new perspective for designing novel solar light driven photocatalysts.
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iScience
·
2023
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IF 5.8
Chengcheng Suo,Wei Li,Sha Luo,Chunhui Ma,Shouxin Liu
Summary Photocatalytic depolymerization is a high value-added approach for utilization of lignin. In this study, magnetic microspheres of FeCoRu@SiO 2 –TiO 2 were synthesized by a co-precipitation method. Doping with CoO x and RuO x was used to improve the response to visible light, and doping with TiO 2 was used to improve the response to ultraviolet light ( λ < 380 nm). The lignin model compound depolymerization rate was >90%. The electron paramagnetic resonance results showed that the reaction occurred in two steps (aerobic phase and oxygen-free phase). Most of the O 2 − was produced in the first step by cleavage of C-O bonds. The second step was inhibited in an oxygen-free atmosphere. This research provides a valid method for enhancing the photocatalytic properties using full-spectrum light and exploring the lignin photocatalytic depolymerization mechanism. Further research is required to develop the catalyst properties and performance to produce radicals.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2015
·Vol. 32
·期 6
·686-692
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IF 3.081
Xiaoyan Wu,Linlin Liu,Zhicong Deng,Li Nian,Wenzhuo Zhang,Dehua Hu,Zengqi Xie,Yueqi Mo,Yuguang Ma
The “far-field” effect of metal nanoparticles (NPs), when chromophores localized nearby metal NPs (typically the distance > λ /10), is an important optical effect to enhance emission in photoluminescence. The far-field effect originates mainly from the interaction between origin emission and mirror-reflected emission, resulting in the increased irradiative rate of chromophores on the mirror-type substrate. Here, the far-field effect is used to improve emission efficiency of polymer light-emitting diodes (PLEDs). A universal performance improvement is achieved for the full visible light (red, green, blue) PLEDs, utilizing gold (Au) NPs to modify the indium tin oxide (ITO) substrates; this is shown by experimental and theoretical simulation to mainly come from the far-field effect. The optimized distance, between the NPs and chromophores with visible light emission ranging from 400 to 700 nm, is 80–120 nm. Thus the scope of the far-field may overlap the light-emitting profile very well to enhance the efficiency of optoelectronic devices. The 30–40% enhancement is obtained for different color-emitting materials through distance optimization. The far-field effect is demonstrated to enhance device performance for materials in the full-visible spectral range, which extends the optoelectric applications of Au NPs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Benlin Dai,Xin Chen,Xiaofan Yang,Gang Yang,Shijie Li,Lili Zhang,Feihu Mu,Wei Zhao,Dennis Y.C. Leung
A novel S-scheme Au/g-C 3 N 4 /BiO 1.2 I 0.6 plasmonic heterojunction was constructed by calcining a mixture of flower-like BiOI and Au/g-C 3 N 4 nanosheets for the first time. This Au/g-C 3 N 4 /BiO 1.2 I 0.6 heterojunction exhibited excellent photocatalytic activity in bisphenol AF (BPAF) degradation and Cr(VI) reduction with high cycle stability under visible light irradiation. In particular, the photocatalytic performance of the optimum material developed (4-Au/g-C 3 N 4 /BiO 1.2 I 0.6 ) can reach 0.0174 min −1 (apparent rate of BPAF degradation) and 0.0204 min −1 (apparent rate of Cr(VI) reduction), which were 6.5 and 3.7 times that of pristine g-C 3 N 4 , respectively. The high photocatalytic performance was due to the high efficiency of charge separation, the excellent light absorption of localized surface plasmon resonance (LSPR) caused by the Au deposition, and the formation of S-scheme heterojunctions, which maintained strong photocatalytic reduction and oxidation activity. Noticeably, the charge density difference and band offsets of the g-C 3 N 4 /BiO 1.2 I 0.6 were calculated. The results revealed that an internal electric field (IEF) was created, which further demonstrated the formation of an S-scheme photocatalytic mechanism.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2017
·
IF 4.217
Qian Wen Cao,Yi Fan Zheng,Xu Chun Song
The efficient visible-light-driven AgIO 3 /AgBr photocatalyst was successfully synthesized by an in-situ anion-exchange method at room temperature. The scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflection spectroscopy (DRS) were used to characterize the obtained samples. The photocatalytic activities of the as-prepared heterojunctions were estimated by decomposing the organic dye RhB under visible-light irradiation ( λ > 420 nm). Compared with pure AgBr and AgIO 3 , the AgIO 3 /AgBr compounds showed dramatically improved visible-light photocatalytic activity. Besides, the results also revealed that 20% AgIO 3 /AgBr exhibited the best photocatalytic activity, which could decompose the RhB completely in 24 min. The enhanced photocatalytic activity of the composites could be ascribed to the high separation rate of the photoinduced electron–hole pairs in the heterojunction structure. Moreover, the radical trap experiments were also carried out which confirmed that h + played the major role in RhB photodegradation . The possible mechanism of RhB degradation on the AgIO 3 /AgBr composite was also discussed according to the results of the experiments and the performance of the obtained photocatalysts.
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Soft Matter
·
2022
·Vol. 18
·期 41
·8017-8023
·
IF 4.046
Shilin Yang,Bo Liao,Enxiang Liang,Shoujun Yi,Qing Liao
A novel type of aggregation-induced emission (AIE) nanoparticles, which are carbon dots (CDs) grafted with block polymer of tetraphenylethylene, spiropyran and N-isopropylacrylamide (CD-g-poly((TPE-co-SPA)-block-NIPAM)), was synthesized. The CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles can emit weak cyan fluorescence in tetrahydrofuran, while showing AIE-enhanced cyan fluorescence in water and solid film. The fluorescence of the CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles can reversibly transform cyan to red with UV/visible light irradiation, and functioned as a reversible fluorescence photoswitch. Importantly, the CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles have low cytotoxicity and, therefore, can be used for imaging in living cells.
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Advanced Optical Materials
·
2020
·Vol. 8
·期 23
·2001073
·
IF 8.286
Junnan Li,Xuechun Wang,Yeshu Tan,Dong Liang,Yatao Zou,Lei Cai,Tian Wu,Kaichuan Wen,Yusheng Wang,Yajuan Li,Tao Song,Lu Wang,Baoquan Sun
Halide perovskites are promising emitters for light-emitting diodes (LEDs) due to their outstanding optoelectronic properties, i.e., tunable bandgap, high photoluminescence quantum efficiency, and excellent color purity. However, in contrast to their green and red cousins, the present blue perovskite LEDs are still suffering from poor operational lifetime and electroluminescence shift during bias operation, hindering their practical applications in full-color information displays. Developing rational strategies to achieve efficient and stable blue perovskite LEDs is one of the urgent tasks in this community. Herein, through substituting the Pb site with strontium ions, blue perovskite films with stable emission under relatively harsh working conditions, i.e., high electrical bias, constant thermal heating, and UV illumination, are obtained, which accordingly guarantees spectrally stable blue perovskite LEDs with external quantum efficiency of 4.1%. Moreover, different alkaline-earth metal ions are also investigated to further explore the effects of B-site ion substitution on the performance of perovskite LEDs. This work demonstrates an alternative path for the development of spectral-stable blue perovskite LEDs.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2019
·Vol. 166
·期 14
·H685
·
IF 3.12
Jun Feng,Yulu Tian,Otieno Kevin Okoth,Ling Cheng,Jingdong Zhang
Metal element doping is an effective way to tune visible light absorption ability and improve the charge carrier separation efficiency of a semiconductor. Herein, we studied the visible light photoelectrocatalytic property of ZnO doped with nickel (Ni-ZnO). The Ni-ZnO film was prepared by using a liquid phase deposition technique. Scanning electron microscopy analysis and X-ray diffraction measurement indicated that the as-prepared Ni-ZnO film comprised of many prismatic wurtzite nanoparticles. X-ray photoelectron spectroscopy analysis indicated that Ni2+ entered the ZnO lattice. Cyclic voltammetric analysis confirmed that Ni2+ in the ZnO lattice was electroactive and a pair of Ni2+/Ni3+ redox waves were observed. UV-visible diffuse reflectance and photoluminescence spectra showed that doping of Ni in ZnO improved the visible light utilization and separation of photogenerated charge carriers. The Ni-ZnO film subsequently exhibited a higher photocurrent than the ZnO film. The photoelectrocatalytic activity of the Ni-ZnO film was evaluated by the degradation of tetracycline under visible light illumination. The degradation rate constant for tetracycline on Ni-ZnO film was found to be 1.65 times higher than that of ZnO film.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Jiaming Li,Zhaoping Chen,Jianming Liu,Enrou Mei,Xiaojuan Liang,Jianping Liu,Weidong Xiang
CsPbX 3 (X = Br, I) quantum dots (QDs) have gradually become the star materials in light-emitting diodes (LED), but its stability has a big impact on development. Here, a variety of novel CsPbX 3 -TS-1 nanocomposites have been fabricated and the luminescence wavelength can be tunable by varying the halide nanocomposites (Br, I). What's particularly nice is that the original photoluminescence quantum yield (PLQY) of CsPbBr 1 l 2 QDs approaches 82% and it still has close to 74% after being combined with TS-1. Besides, the nanocomposites enhance stability resisting moisture, thermal stressing and light. In addition, a 460 nm InGaN blue chip, YAG:Ce 3+ and CsPbBr 1 I 2 -TS-1 were equipped with white light emitting diodes (WLEDs), with a luminous effect of 95 lm/W, a color rendering index of 80, and a color temperature of 5144 K. Meanwhile, wide color gamut (116% of the National Television Standards Committee, 86.3% of the ITU-R Recommendation BT. 2020) and great chromaticity coordinate (0.3425, 0.3408) are realized. This is a very important step to open up the awkward situation of the practical application of perovskite QDs materials in LED.
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