JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
·
IF 6.155
Sheng Guo,Zhixiong Yang,Huali Zhang,Wei Yang,Jun Li,Kun Zhou
A simple sol-gel approach is proposed herein to fabricate CaFe 2 O 4 for the degradation of various organic pollutants (rhodamine B (RhB), tetracycline hydrochloride, humic acid, and methylene orange) under LED light irradiation mediated by peroxymonosulfate (PMS). The results indicate that the calcination temperature can significantly influence the performance of CaFe 2 O 4 for PMS activation, and the CaFe 2 O 4 sample obtained at 800 °C (CaFe 2 O 4 -800) exhibits the best efficiency in degrading RhB, which is much higher than that of Fe 2 O 3 -800. This can be attributed to the efficient separation of photogenerated electrons (e − ) and holes (h + ) by PMS, which is validated by transient photocurrent response and photoluminescence measurements. Results from density functional theory calculations indicate that the valence band of CaFe 2 O 4 -800 exhibits a high concentration of carriers and weak localization of electrons, which are favorable for PMS activation. Radical scavenging results confirm that h + and O 2 • − are the dominant reactive species. Moreover, CaFe 2 O 4 -800 not only demonstrated a stable performance during eight cycling runs with negligible iron leaching but also exhibited excellent degradation efficiency under natural water and sunlight. Finally, the mechanism and pathway of RhB degradation by the CaFe 2 O 4 -800/PMS/LED system are also proposed. This work presents the enormous prospect of CaFe 2 O 4 as an environmentally benign photocatalyst for PMS activation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lu Zhang,Meng Zhang,Xiaozhe Song,Hui Wang,Zhaoyong Bian
Here, we report enhancement of the photoelectrochemical (PEC) performance of MnO x /graphite-like carbon nitride (g-C 3 N 4 ) nanocomposites synthesized by one-step thermal decomposition for degradation of clofibric acid (CA). MnO x showed enhanced broadband ultraviolet–visible light regions, efficient charge generation–separation, and enhanced PEC performance when combined with g-C 3 N 4 . Photogenerated holes can be efficiently captured by introducing Mn 2+ /Mn 3+ /Mn 4+ valence band transitions. In addition to a good visible-light response, the MnO x /g-C 3 N 4 -10 (g-C 3 N 4 with 10% Mn(NO 3 ) 2 ·6H 2 O) photoanode showed enhanced photocurrent density of 0.03 × 10 −3 A cm −2 at 0.63 V vs. Ag/AgCl, which was approximately 100 times that of pristine g-C 3 N 4 . The superoxide radical and positive holes played dominant roles in PEC degradation of CA. The MnO x /g-C 3 N 4 -10 photoanode showed the highest photoelectrocatalytic performance under acidic conditions because of electrostatic attraction between the electrode and CA. The CA degradation ratio using the MnO x /g-C 3 N 4 -10 photoanode was 100% under visible light in 6 h at pH = 3. This work provides a simple and sustainable strategy to modify g-C 3 N 4 for captured holes to improve PEC degradation of CA, and it is promising for application to different materials in a variety of fields.
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3D Printing and Additive Manufacturing
·
2020
·Vol. 7
·期 3
·115-125
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IF 3.579
Yue Wang,Yancheng Wang,Deqing Mei
Digital light processing (DLP)-based printing process has been used to print microfeature-sized constructs and architectures for biomedical applications; the key challenge is to achieve both large printing size and high accuracy at the same time. Here we reported a scalable DLP-based three-dimensional (3D) printing system with scalable resolution and building size, which was used for printing of multiscale hydrogel fractal bionic channels. Scalable printing was achieved by moving the convex lens of the printing system, and thus, each single micromirror of the digital micromirror device chip corresponded to the single-pixel size scaling from 6 to12 μm. Using this system, we were able to use poly (ethylene glycol) diacrylate to fabricate a variety of multiscale architectures, such as regular fractal Y-shaped channels, and more irregular and intricate geometries, such as biomimetic capillary vascular networks. Blue and red food dye solutions were able to freely fill all these channels in the scaffolds, from the trunk (>1500 μm in width) to small branch (∼30 μm in width) by capillarity. Cell experiments were carried out to certify the biocompatibility of printed multiscale biomimetic channel networks. This work reveals significant progress in printing multiscale constructs with both large printing size and high precision in scalable DLP-based 3D printing.
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高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 152
·期 24
·
IF 2.991
Zhu Jingxian,Jiang Wenshuai,Wang Bin,Niu Lijuan,Dong Chenxi,Qu Dan,An Li,Wang Xiayan,Sun Zaicheng
Mixed phase TiO 2 (Degussa P25) exhibits superior photocatalytic performance and stability due to the formation of the hetero-phase junction between anatase and rutile. However, the large bandgap limits its visible light activity. CdS is a photocatalyst with a broad light absorption band up to 550 nm. Constructing a hetero-phase junction will greatly promote the photocatalytic activity of CdS. In this work, the one-step solvothermal method was used to synthesize CdS hetero-phase junction with both hexagonal wurtzite (WZ) and cubic zinc blende (ZB) phases. The ratio of WZ and ZB phases can be tuned by adjusting the solvent ratio and reaction time to construct type I junction and effectively separate the photogenerated electron–hole pair. Under visible-light illumination, the optimal photocatalytic activity of the prepared material reaches 7.96 mmol h −1 g −1 , and the quantum efficiency is 36.7% at 420 nm, which is three times higher than that of any single-phase sample (cubic or hexagonal phase) and maintains high photocatalytic stability as well. It is expected that this work will provide a feasible prospect for the practical application of high-efficiency homogeneous junction photocatalysts.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
·
IF 3.306
Shuguang Li,Zhiyu Liu,Chunxiao Lu,Zhihui Qu,Congcong Piao,Jianhe Tang,Dawei Fang,Jun Wang
The use of co-catalysts can observably enhance photocatalytic hydrogen production activity. In this work, a novel visible-light driven photocatalyst, (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite, is prepared for the first time by loading Er 3+ :Y 3 Al 5 O 12 , MoSe 2 -RGO and RuO 2 on the surface of ZnS nanoparticles. Er 3+ :Y 3 Al 5 O 12 as an effective visible-to-ultraviolet up-conversion luminescence agent can provide the ultraviolet-light to activate wide band-gap ZnS. MoSe 2 -RGO and RuO 2 , acting as conduction band co-catalyst and valence band co-catalyst, respectively, can effectively separate the photo-generated carriers and supply more reactive sites. The activities of the photocatalysts were assessed via photocatalytic hydrogen production in Na 2 S and Na 2 SO 3 aqueous solution under 300 W xenon lamp irradiation. In addition, the visible-light irradiation time and used times of the prepared samples as influence factors on the photocatalytic hydrogen production were also investigated. It was easily found that the prepared (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite shows fairly high activity in photocatalytic hydrogen production, compared with single ZnS photocatalyst. It was mainly attributed to the excellent up-conversion luminescence property of Er 3+ :Y 3 Al 5 O 12 and the efficient separation of photo-generated electrons and holes caused by MoSe 2 -RGO and RuO 2 . This research may pave an effective way for photocatalytic hydrogen production utilizing solar light.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12789-12800
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IF 3.553
Han Jie,Jiang Weitao,Zhang Hongjian,Zhang Yajun,Feng Xueming,Wang Lanlan,Niu Dong,Lei Biao,Liu Hongzhong
There is a growing interest in the design and fabrication of small-scale soft actuators and robotics, especially the realization of functionalities mimicking biological systems with biomimetic motions in response to external stimuli. However, the mobility and self-weight are still the critical challenges for further improvement and broader application of soft actuators. It is attractive to develop untethered and ultra-light small-scale robotics by integrating the actuators and drivers while achieving the ability to respond to external stimuli. Inspired by the spiders that rely on electrostatic forces in the environment to stay airborne by their ballooning silk, a positively charged fiber-paper structure-based soft actuator is proposed. Utilizing electrospinning of tetraethyl orthosilicate (TEOS) solution, this ultra-light soft actuator can realize the movement of bending and high-frequency vibration with the stimuli of electrostatic force in the electric field. Programmable motions, i.e., continuous bending with a series of angles, variable frequency vibration, can be realized by regulating the external electric field. The 3D fluffy structure of the silica micro-nanofibers and the paper-based structure endow the soft actuator with ultra-lightweight and excellent flexibility. The untethered, ultra-light soft actuator suggests a feasible approach to develop ultra-light, soft and autonomous robotics and holds promise in reconnaissance and environmental detection. Graphic abstract
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Yuxin Song,Jihui Lang,Jiale Guo,Qi Zhang,Qiang Han,Hougang Fan,Ming Gao,Maobin Wei,Jinghai Yang,Zifeng Sheng
A carbon cloth@TiO 2 @Ag (CC@TiO 2 @Ag) membrane has been prepared by two-step method, including the hydrothermal method to make TiO 2 grow on carbon cloth and the photodeposition method to synthesize Ag element on CC@TiO 2 for oil-water separation. The obtained CC@TiO 2 @Ag membrane shows the good superhydrophilicity and underwater superoleophobicity due to its hierarchical broccoli-like interface with the good surface roughness and the natural hydrophilicity of TiO 2 . Importantly, the resultant membrane exhibits a strong self-cleaning ability under visible light irradiation of CC@TiO 2 @Ag membrane with loading a certain amount of Ag, so that the separation efficiency remains above 99% even after 60 cycles for various oil-water mixtures. Moreover, the CC@TiO 2 @Ag membrane is flexible and durable. The high separation efficiency and excellent self-cleaning ability of the membrane may own the broad application prospects in the field of oil-water separation.
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高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-12
·
IF 12.121
Xu Leimeng,Li Jianhai,Cai Bo,Song Jizhong,Zhang Fengjuan,Fang Tao,Zeng Haibo
Perovskite quantum-dot-based light-emitting diodes (QLEDs) possess the features of wide gamut and real color expression, which have been considered as candidates for high-quality lightings and displays. However, massive defects are prone to be reproduced during the quantum dot (QD) film assembly, which would sorely affect carrier injection, transportation and recombination, and finally degrade QLED performances. Here, we propose a bilateral passivation strategy through passivating both top and bottom interfaces of QD film with organic molecules, which has drastically enhanced the efficiency and stability of perovskite QLEDs. Various molecules were applied, and comparison experiments were conducted to verify the necessity of passivation on both interfaces. Eventually, the passivated device achieves a maximum external quantum efficiency (EQE) of 18.7% and current efficiency of 75 cd A −1 . Moreover, the operational lifetime of QLEDs is enhanced by 20-fold, reaching 15.8 h. These findings highlight the importance of interface passivation for efficient and stable QD-based optoelectronic devices.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qing Cheng,Wulin Yang,Qingling Chen,Jiajun Zhu,Deyi Li,Licai Fu,Lingping Zhou
Maintaining a highly negative value of conduction band (CB) potential of photocatalysts through metal doping has been a great challenge. Herein, we investigated the effects of Fe-doping on the crystal structures and electronic structures of zirconia (ZrO 2 ) in detail by combining experiments and Density Functional Theory (DFT). It was revealed that the Fe-doping obviously triggered the formation of tetragonal phase ZrO 2 and induced a defect states in the bandgap of Fe-doped ZrO 2 . Due to the coherent effect between the electrons of the Fe 3 d orbitals and ZrO 2 intrinsic electronic states, the defect states expanded the light absorption edge of ZrO 2 and Fe-doped ZrO 2 showed a small bandgap with maintaining a highly negative value of the CB potential. Meanwhile, Fe-doping significantly enhanced photoelectrochemical properties, the efficiency separation of electron-hole pairs and photocatalytic activity in comparison with the pristine ZrO 2 . We also found that 0.5%Fe-ZrO 2 exhibited the optimum photocatalytic performance, and reached 96% for degradation of Rhodamine B (RhB) within 150 min under visible light irradiation. This work elucidated the mechanism of the photocatalytic degradation of RhB over Fe-doped ZrO 2 and provided a promising approach in designing highly negative CB potential of ZrO 2 via Fe doping toward sustainable environmental remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Kaili Yao,Yi Liu,Huan Yang,Jingyou Yuan,Shaoyun Shan
In this study, a polyaniline-modified 3D-spongy SnS photocatalyst (PANI/SnS) has been prepared using an in-situ oxidative polymerization technique for the enhanced photocatalytic degradation of methyl orange. PANI/SnS reached to a rate constant of 4.040 × 10 −2 min -1 > 2 times of that pure SnS and maintained a good stability after four cycling runs for methyl orange degradation. The better photocatalytic activity and stability of PANI/SnS catalyst were ascribed to the π-conjugated structure characteristic of PANI and the interaction between PANI and SnS. On the one hand, induced π-conjugated electrons transferred from PANI to SnS could effectually inhibite the electrons and holes recombination. On the other hand, the presence of C–S and Sn-N bonds between PANI and SnS could protect the S and/or Sn element from direct exposure to the corrosive environment, then restraining photocorrosion behavior. This study implies that conductive conjugated polymer (PANI) modified tin sulfide will be a potential reusable and stable photocatalyst for methyl orange removal from waste-water by photocatalysis .
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高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 12
·2343-2351
·
IF 5.958
Ran Wang,Guoan Lin,Xiaoxiang Xu
La/Zr co-doped SrTaO2N has been investigated as visible-light-active photocatalysts for water reduction. Unlike previous aliovalent doping that leads to a decrease in light absorption, La/Zr co-doping largely preserves the visible light absorption of SrTaO2N. More importantly, the La/Zr co-doping not only helps to improve surface hydrophilicity and reduce particle sizes but also effectively inhibits defect formation (e.g. Ta4+) in SrTaO2N. These modifications are responsible for significant enhancements in photocatalytic H2 production. AQE as high as 0.84% was achieved at 420 ± 20 nm for Sr0.4La0.6Ta0.4Zr0.6O2N (x = 0.6), which also showed good durability and stability. Further analysis suggests that La/Zr co-doping negatively shifts the conduction band edge positions of SrTaO2N and contributes to better charge separation conditions.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 11
·1-7
·
IF 1.784
Ge Bo,Li Fengyan,Zhao Xingchuan,Li Wenzhi,Ren Guina,Wang Min,Zhang Zhaozhu
Sewage not only contains water-soluble contaminants but water-insoluble contaminants as well. Superhydrophobic CdS–melamine foam prepared in this research satisfies the requirements of water purification. The photocatalyst CdS effectively adsorbs light energy to generate active species (⋅O 2 − ) for degrading water-soluble pollutants. At the same time, superhydrophobic/superoleophilic characteristic of the melamine sponge can be utilized to remove water-insoluble pollutants. Finally, the degradation mechanism of materials was obtained by studying the parameters such as band gap and valence band structure, as well as by analyzing the experimental data of active species.
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