Journal of Water Process Engineering
·
2021
·
IF 5.485
Qi Wang,Wenming Zhang,Xiaoru Hu,Limei Xu,Guodong Chen,Xiaochen Li
A novel hollow-sphere structure of tungsten trioxide and titanium dioxide (WO 3 /TiO 2 ) heterojunction was prepared by using a combination of hydrothermal and calcination method. The prepared WO 3 /TiO 2 heterojunction was characterized with scanning electron microscope (SEM), X-ray diffractometer (XRD), Transmission electron microscopy (TEM), X-ray electron spectrometer (XPS), etc. The results showed that 10 % WO 3 /TiO 2 (the mass ratio of W in WO 3 to Ti in TiO 2 was 10 %) has a hollow spherical structure, and the bandgap energy of WO 3 /TiO 2 sample was lower than that of TiO 2 . WO 3 /TiO 2 heterojunction showed an improved photocatalytic performance, compared to pure TiO 2 and WO 3 as well as ZnO and SnO 2 , in degrading a high concentration dye methylene blue (MB) and a micro-organic pollutant metoprolol (MET) under visible-light. MB and MET removal efficiencies could reach 87.8 % and 67.1 %, respectively, within 150 min, by 10 % WO 3 /TiO 2 sample. The relevant photocatalysis mechanisms of the WO 3 /TiO 2 photocatalyst were revealed and discussed. TiO 2 in a heterojunction acted as a photo-generated holes acceptor, effectively decreasing the recombination of photo-generated carriers and improving photocatalytic performance. Our results indicate that the hollow spherical WO 3 /TiO 2 heterojunction is more promising candidate for wastewater treatment in practical applications.
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2021
·Vol. 23
·期 17
·10448-10455
·
IF 3.676
Fengjiao Zhao,Feng Zhang,Dongxue Han,Kai Huang,Yang Yang,Hongming Yin
Solar to hydrogen (H2) conversion systems based on carbon nanomaterials have shown great potentials in the clean energy field recently. However, for most systems, energy level alignments and light-induced redox processes are still unclear, which hinder artificial designing for higher efficiency of solar energy conversion and further applications. Here we report 77% enhancement in the light-driven H2 generation efficiency of N,S co-doped carbon quantum dot (N,S-CQD) aqueous system by adding TiO2 nanoparticles. Using steady-state and transient spectroscopy, four specific energy levels of CQDs are confirmed with the band gaps of 3.55 eV (X4), 2.99 eV (X3), 2.76 eV (X2) and 1.75 eV (X1), respectively. The X2 energy band is highly active for H+ reduction with a longer lifetime of 13.38 ns. Moreover, the observed low efficiency of intrinsic transition from X3 to X2 band of N,S-CQDs accounts for the poor performance of solar to H2 conversion for pure N,S-CQDs based on H2 generation and detailed time-resolved spectroscopic results. The mechanism of H2 generation enhancement can be explained by multiple electron transfer processes between N,S-CQDs and TiO2 NPs where TiO2 NPs act as electron intermediates that efficiently transfer electrons from the inert band (X3) to the active band (X2) for H2 generation. This study enriches the fundamental understanding of N,S-CQDs and provides a new pathway toward high-performance N,S-CQD-based solar to H2 conversion systems.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Shujin Zhou,Kai Sheng,Na Zhang,Han Zhang,Hongguang Li,Panpan Sun,Xia Xin
Metal nanoclusters (NCs) have attracted much attention due to their ultrasmall sizes and unique electronic structures. In recent years, the light-induced reversible assembly of Au NCs is already reported. However, to achieve light-triggered reversible self-assembly of Cu NCs is still challenging. Herein, we prepared photoresponsive Cu NCs by using an azo-containing ligand, i.e., 3,5-dimethyl-4-(phenyldiazenyl)-1H-pyrazole) (abbreviated to Hazopz). Each nanocluster contains three Cu(I) in the core and has atomic precision (denoted as Cu 3 -NCs hereafter). Self-assembly of Cu 3 -NCs into nanofibers occurred in binary solvent mixture with toluene as a good solvent and methanol (MeOH) as a poor one. When the suspension containing the nanofibers was irradiated by UV light, the originally straight nanofibers became bent. This morphological change is mainly due to the isomerization of the peripheral azo groups of the Cu 3 -NCs from trans- to cis -conformation, and to a small extent ascribed to the increased solubility of the cis -conformation of the azo groups in the binary solvent. The disassembled aggregates can reassemble and the bent nanofibers can become straight again when exposed to visible light. This process can be repeated for at least three times, indicating the high reversibility of this light-triggered morphological change of Cu 3 -NCs. The one-dimensional self-assemblies with light-triggered, reversible morphological changes achieved in this work can be potentially used as a medium material in an optical information storage device, and can write and erase information through the irradiation of UV light and visible light.
✓ 已验证
产品关联
DOI
高影响因子
National Science Review
·
2021
·Vol. 9
·期 2
·
IF 17.275
Sun Siyu,Ma Liangwei,Wang Jie,Ma Xiang,Tian He
A set of red-light-excited, metal-free room-temperature phosphorescence (RTP) systems was constructed with brominated phenolsulfonephthaleine derivatives. The best metal-free RTP system has the reddest near-infrared (NIR) RTP emission (λp = 819 nm) with the highest phosphorescence quantum yield (ΦRTP = 3.0%) so far identified. The RTP emission can be switched ON-OFF by adding acid and alkali alternately. A logic operation with half-subtractor function and dual-channel response (visible light emission/NIR RTP emission) was also constructed based on these properties.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Zhi Liu,Jia Zheng,Lianfeng Duan,Zhi Zhu
CO2 photoreduction into high-valued fuels is considered as a promising route to alleviate the clash between the environment and energy. Morphology-dependent CeO2 nanocrystallines with special crystal planes and increased amounts of specific surface areas, structural defects, and active sites have recently demonstrated excellent performance in catalysis. In this article, a biomass-assisted synthesis of CeO2 (BC) photocatalyst is successfully synthesized via a simple yet effective hydrothermal-calcining method by using commercial Ce(NO3)3 as a precursor and leaves of Alternanthera philoxeroides (LAP) as a crystal growth modifier. The amount of LAP introduced into the precursor has a significant effect on regulating the growth of the formed CeO2 from nanocubes to nanorods for the resulting BCs. Owing to the emergence of the just right microenvironment for regulating the growth of the CeO2 nanocrystalline, the optimal sample of BC-15 with a morphology of nanorods is found to be the most efficient one as a photocatalyst for CO2 reduction under visible light. As the major product, the CO yield (126.8 μmol g–1 at a reaction time of 6 h) of BC-15 is ∼7.4-fold of the reference CeO2 nanocubes synthesized without LAP in the precursor. In addition, the underlying evolution process of the nanorods and detailed mechanism insight into the boosted CO2 photoreduction performance are investigated by means of a series of experimental characterizations and results. The present work provides a meaningful protocol to utilize the crystal phase engineering strategy to design morphology dependence of photocatalysts and assisted synthesis with renewable biomass materials for solar-to-fuel conversion.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2020
·Vol. 54
·期 7
·074005
·
IF 3.169
Fangru He,Zhe Liu,Jian Qing,Xinxin Zhao,Xinyan Liu,Fulong Ma,Yanpeng Dai,Shi-Jian Su,Lintao Hou,Zhengjian Qi
Pinhole-free perovskite films with low defect density are essential to boost the efficiency of metal halide perovskite light-emitting diodes (PeLEDs). In this work, a novel amphiphilic silicone copolymer (Si14-PEG14-QAC) is introduced into perovskite as a passivation agent to improve the performance of PeLEDs. Si14-PEG14-QAC possesses polyethylene glycol and –NCH3 units, which can interact with perovskite by hydrogen bonding, resulting in high-quality perovskite films with small-size crystals, high coverage, low defect density, and enhanced photoluminescence quantum yield. Consequently, the perovskite films with Si14-PEG14-QAC enable efficient green PeLEDs with an external quantum efficiency of 4.5%, which is much higher than that of the control device without the polymer passivator (0.86%). This work suggests the great potential of silicone copolymers as passivation agents for high-quality perovskite films with high performance.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ji Fan,Bingwei Bao,Zehong Wang,Hongqi Li,Yu Wang,Yixiang Chen,Wei Wang,Dan Yu
Materials with reversible optical properties under light irradiation have great potential application in various optoelectronic fields. Particularly, photochromic materials have received extensive attention in many fields. Herein, a novel composite photochromic fabric was fabricated via Layer-by-Layer self-assembling of phosphomolybdic acid (PMoA) and polyacrylamide (PAM). Based on the established electron transfer photochromic system, the dynamic manipulation of photochromic behavior of the cotton fabric was achieved with outstanding fine high-resolution image under the visible light irradiation. The prepared fabric can change from colorless to blue rapidly (within 5 min) under UV light and maintain excellent reusability photochromic performance after more than 20 reversible color changing cycles, implying its great potential applications in the field of intelligent devices and UV detection in sunlight. Moreover, we constructed fabric weaving and developed a Quick Response (QR) code security identification to prove the practical application of the prepared photochromic fabric in the fields of wearable, optical information storage and information security encryption.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 58
·35164-35173
·
IF 3.119
Juan Pang,Xincheng Mao,Jialin Xu,Xiang Zhao,Jingyang Kong,Xiaohong Hu
The application of azobenzene (AZO) as a kind of photo-switch is restricted by its excitation source, i.e., UV light. Hence, visible light-driven azobenzene-based photo-switching is needed and has been designed in the work. In order to forecast the optimal triggered wavelength, the electrostatic potential, theoretical UV-vis spectra, as well as the energy gap for focused structures was calculated to describe the energy and orbit status of the molecules by DFT. According to the theoretical optimization results, m-Methyl Red (m-MR) containing copolymer was successfully synthesized as a visible light-driven photo-switch. Further, for performance evaluation, the efficiency and effectiveness of different excitation wavelengths was firstly evaluated for the copolymer using m-MR and m-Methyl Red acrylic anhydride (m-MRAA) as the controls. Compared with m-MR and m-MRAA, the copolymer exhibited outstanding characteristics as a photo-switch according to its response–recovery behavior. At the same time, blue light proved to be the most efficient excitation light source. Moreover, the equilibrium response time and recovery time showed some dependence on the excitation wavelength. Secondly, the influence of the light intensity on the isomerization transition was investigated. A relatively low light density could lead to a relatively low degree of the final cis form and needed more equilibrium time for trans to cis transformation but showed little effect on the recovery process. Thirdly, repeatable on/off irradiation was used to evaluate the fatigue resistance of the copolymer. Good fatigue resistance without photobleaching was verified from the results. Fourthly, the influence of the solvent on visible light-driven isomerization was also evaluated. Finally, the synthesized copolymer still had the characteristic of a pH indicator with a critical point at pH 5.0 and exhibited an obvious fluorescent characteristic.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Lan Yuan,Yue-Hua Li,Zi-Rong Tang,Jinlong Gong,Yi-Jun Xu
Pairing CO 2 reduction with oxidative organic synthesis in one photoredox cycle opens a new avenue for cooperative utilization of excited electrons and holes towards efficient solar-to-chemical energy conversion. In this work, we demonstrate a facile cetyltrimethylammonium bromide (CTAB) surfactant functionalized ZnIn 2 S 4 (ZIS)-based dual-functional reaction system for efficient visible light-driven CO 2 -to-CO conversion pairing with selective oxidation of benzyl alcohol to value-added C C coupled products. Our research suggests that the markedly enhanced redox activities are mainly attributed to the unique structure of CTAB-ZIS featuring more crystalline and surface defects, which greatly promotes the interfacial charge carrier transfer, and in particular elevates CO 2 activation and electrons reducibility. It is anticipated that this work would inspire further establishment of efficient novel photocatalysts and cooperative reaction system coupling CO 2 reduction and organic synthesis in a cost-effective manner under ambient conditions to meet the economic and social sustainability goals.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 35
·16522-16532
·
IF 3.553
Wei Zhiping,Dong Xiaoli,Zheng Nan,Wang Yu,Zhang Xiufang,Ma Hongchao
A series of niobium-doped BiOBr (Nb-BiOBr) were successfully synthesized via hydrothermal method. Moreover, the morphology structure and optical property of BiOBr and Nb-BiOBr samples were determined using various characterization techniques including SEM, TEM, EDS, BET, XRD, XPS and DRS, etc. The photocatalytic performance of Nb-BiOBr was deeply investigated with the rhodamine B and ofloxacin degradation under visible-light irradiation as model reaction. The results showed that Nb-BiOBr samples depicted the outstanding photocatalytic performance, especially for the 1.25Nb-BiOBr. Moreover, its reaction kinetic constant was ca. 6.4 times higher than that of undoped BiOBr. The observed photocatalytic performance could be attributed to the strong light absorption, enhanced separation efficiency of charge carriers as well as high specific surface area. Meanwhile, 1.25Nb-BiOBr demonstrated stability in RhB degradation, thereby facilitating the water treatment application.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 6
·2115-2122
·
IF 7.059
Weigao Wang,Zhenghui Wu,Taikang Ye,Shihao Ding,Kai Wang,Zhengchun Peng,Xiao Wei Sun
Preparing perovskite light emitting diodes (PeLEDs) by a solution process leads to inevitable imbalanced carrier injection and solvent erosion, which prevent us from obtaining high-performance PeLEDs. Here, we report a facile method to fabricate green-emitting PeLEDs with double hole transport layers (HTLs) that significantly promote the hole injection and charge balance. To address the problem of solvent erosion, 1,4-dioxane was adopted as the solvent for poly(9-vinylcarbazole) (PVK) and it was cast onto the surface of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,40-(N-(p-butylphenyl))-diphenylamine)] (TFB). At the same time, an orthogonal solvent 1,4-dioxane was employed to improve the surface smoothness of the perovskite film on the double HTLs. The PeLEDs with TFB/PVK double HTLs showed a maximum current efficiency (CE) and an EQE of 53.5 cd A−1 and 12.9%, respectively. The EQE of the device is about 1.7 and 3 times higher than that of the single HTL device with PVK and TFB, respectively. This remarkable improvement is mainly attributed to the cascade-like energy alignment of the double HTLs, which prevents charging in perovskite nanocrystals (NCs). This work offers a new insight into preparing high performance PeLEDs for displays and lighting devices.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Suqing Wu,Xueyan Li,Yanqin Tian,Yan Lin,Yun Hang Hu
As an emerging semiconductor different from regular white TiO 2 , black TiO 2 has attracted intensive attention on visible light driven photocatalysis for degrading dyes, but rarely for degradation of antibiotics. In this study, black anatase-TiO 2 was demonstrated to be an effective catalyst for tetracycline (TC) visible light photodegradation. 66.2% removal efficiency of TC was achieved over black TiO 2 under visible light illumination, while white TiO 2 and N-doped TiO 2 exhibited 43.4% and 59.6% removal efficiencies, respectively. Furthermore, only ⋅O 2 − radicals played an important role in TC photodegradation over white TiO 2 , whereas both ⋅O 2 − and h + were responsible for the degradation over black TiO 2 and N-doped TiO 2 . Different from white TiO 2 for visible light photocatalytic TC degradation that follows photosensitization, the visible light photodegrataion over black TiO 2 is due to photoexcitation.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）