APPLIED OPTICS
·
2020
·Vol. 59
·期 28
·9042-9050
·
IF 1.961
Xiaolin Zhang,Wenfei Shen,Fanchen Bu,Yao Wang,Xiaoshuang Yu,Wenna Zhang,Jiuxing Wang,Laurence A. Belfiore,Jianguo Tang
Sodium alginate (SA), as a natural marine biopolymer, possesses many
merits such as super-easy accessibility from the ocean, low cost,
nontoxicity, and no synthesis for practical application. For the
chemical structure, SA has enough lone electron pairs of oxygen atoms
in the backbone and short branched chains, which is expected to
passivate oxygen vacancy on the surface of the ZnO cathode buffer
layer to improve the photovoltaic performance. Herein, it was applied
to modify the surface trap of the ZnO layer in fullerene and
non-fullerene polymer solar cells (PSCs). The defects were
successfully reduced, and the trap-assisted recombination decreased.
In a $\text{PTB7-Th}:{{\rm
PC}_{71}}{\rm BM}$ system, power conversion efficiency
(PCE) was improved from 8.06% to 9.36%. In the PM6:IT-4F system, PCE
was enhanced from 12.13% to 13.08%. The addition of SA did not destroy
the stability of the device. Overall, this work demonstrates the
potential for preparing devices with long-time stability and
industrial manufacture of PSCs by using biological materials in the
future.© 2020 Optical Society of
America
研究领域:
材料科学
·
可再生能源
·
光电化学
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Nan Qing Yang,Jin Li
To improve the photocatalytic degradation efficiency of ZnO and ZnIn 2 S 4 for organic pollutants, ZnO/ZnIn 2 S 4 0D/2D composite heterojunction materials were constructed using 0D ZnO nanoparticles and 2D layered ZnIn 2 S 4 . ZnO nanoparticles were fixed on the surface of 2D ZnIn 2 S 4 to form type-II heterojunctions, which provided abundant active sites and presented low ionization energy, good visible light adsorption, and low electron–hole recombination rates. The fabricated ZnO/ZnIn 2 S 4 composites presented an excellent performance in photocatalytic experiments. The photocatalytic first-order kinetic coefficient of the 10% ZnO/ZnIn 2 S 4 composite with a ZnO loading of 10 wt% was 4.9 times higher than that of ZnO nanoparticles. Therefore, constructing 0D/2D heterojunctions is an effective method for improving the degradation efficiency of ZnIn 2 S 4 toward organic pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 35
·13260-13272
·
IF 4.052
Shaojia Song,Kun Wu,Huadong Wu,Jia Guo,Linfeng Zhang
A series of multi-shelled Fe3+/Sn4+-doped ZnO microspheres were synthesized by calcining carbon microspheres as sacrificial templates. The crystal structure, morphology and optical properties of prepared photocatalysts were investigated by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Scanning Transmission Electron Microscopy (STEM), X-ray Photoelectron Spectroscopy (XPS), UV-Vis absorption spectroscopy (UV-Vis DRS), Photoluminescence (PL) spectroscopy and transient photocurrent techniques. FESEM and STEM images demonstrated that the samples had a multi-shelled structure and the doping elements were uniformly dispersed in the ZnO matrix. DRS and PL spectra and photocurrent measurements show that the Fe/Sn doped-ZnO samples exhibited higher visible absorption and lower recombination rates of photogenerated electron–hole (e−/h+) pairs. These advantages resulted in higher photodegradation efficiency of these catalysts towards methylene blue (MB) and ciprofloxacin (CIP). Moreover, the band structure and density of states of the un-doped ZnO and Fe/Sn-doped ZnO models with three different doping ratios were calculated based on the CASTEP code. The roles of the Fe3+/Sn4+ dopant in the ZnO matrix were found to be band gap control and electron density adjustment due to the Fe(3d) and Sn(5s, 5p) orbitals. This work has a certain reference value for constructing multi-shelled photocatalysts with doping modification and investigating the mechanism of enhanced photoactivity at the microscopic level.
研究领域:
材料科学
·
理论计算化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 3.226
Yu-Xia Song,Li-Yuan Chai,Chong-Jian Tang,Ruiyang Xiao,Bing-Rong Li,Di Wu,Xiao-Bo Min
The spread application of nanoparticles (NPs) would cause instability on anaerobic ammonium oxidation (anammox) process. The present study focused on the short-term evaluation of ZnO nanoparticles (NPs) on anammox process by batch tests. Results indicated that a significant inhibition occurred under ZnO NPs stress of 5–100 mg gVSS −1 . The half inhibitory concentration (IC 50 ) of ZnO NPs was found to be 11.6 mg gVSS −1 . The release of zinc ions from ZnO NPs dissolution was confirmed to be the main mechanism of inhibition on anammox activity. Haldane kinetic model simulation results confirmed that ZnO NPs imposed a non-competitive inhibition on nitrite conversion by decreasing maximum nitrogen removal rate ( q max ), while they showed a competitive inhibition on ammonium conversion kinetics with affinity constant ( K s ) increasing by 6 times. From the competitive inhibition results, it is suggested that the inhibition caused by ZnO NPs could be alleviated and recovered under higher ammonium concentrations.
研究领域:
环境生物学
·
微生物生态学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·Vol. 40
·期 3
·484-489
·
IF 3.1
Xiao Qi,Liu Ting,Zhou Qianhe,Li Liangyu,Chang Chuntao,Gao Dawei,Li Danyang,You Feifei
Photocatalytic CO 2 reduction driven by solar light is a green approach that can decrease the greenhouse effect induced by high CO 2 concentration in the atmosphere and generate carbon-based chemicals/fuels as well. In this paper, non-metal co-catalysts ZnO/ZnS type-II hetero-junction nanoparticles with a rough surface were prepared through a hydrothermal process. When used as a photocatalyst for CO 2 reduction, the optimal one showed good cycle stability and a higher yield rate of 27.8 µmol·g −1 ·h −1 for CO 2 conversion into CO. The outstanding catalytic activity originated from i) the rich interfaces between ZnO and ZnS in the nanoscale could significantly reduce the delivery path of carriers and improve the utilization efficiency of photo-excited electron/hole pairs and ii) enriched surface oxygen defects could supply much more reaction active sites for CO 2 adsorption.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
催化
·
可再生能源
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Yingdong Hao,Fang Mao,Jialin Shi,Yonghui Zhao,Luozhen Jiang,Nannan Sun,Lina Li,Wei Wei
New catalysts and product diversification of direct CH 4 conversion remain very challenging in catalysis. Here, we report FeO x /ZnO photo-catalysts for the conversion of CH 4 to liquid oxygenates with high yield (4,108 μmol·g cat −1 ·h −1 ) and nearly 100% selectivity. Based on the combinative results from X-ray photoelectron spectroscopy, X-ray absorption, electron paramagnetic resonance, radical quenching, and theoretical calculations, it is found that, in addition to the activation of CH 4 in the liquid phase, the presence of highly dispersed FeO 3 motifs in the ZnO lattice facilitates the formation of surface-active O − species; this plays an effective role for CH 4 activation to · CH 3 radicals. Meanwhile, HCHO is obtained as the major product in our system, rather than the typically reported CH 3 OH, and this may offer new opportunities to extend the product structure of CH 4 upgrading via tandem catalysis.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2018
·
IF 1.861
Xiaojuan Li,Bo Jin,Jingwen Huang,Qingchun Zhang,Rufang Peng,Shijin Chu
In this study, novel ternary Fe 2 O 3 /ZnO/ZnFe 2 O 4 (ZFO) composites were successfully prepared through a simple hydrothermal reaction with subsequent thermal treatment. The as-prepared products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis, Barrett-Joyner-Halenda (BJH) measurement, and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). The photocatalytic degradation of rhodamine B (Rh B) under visible light irradiation indicated that the ZFO composites calcined at 500 °C has the best photocatalytic activity (the photocatalytic degradation efficiency can reach up to 95.7% within 60 min) and can maintain a stable photocatalytic degradation efficiency for at least three cycles. In addition, the photocatalytic activity of ZFO composites toward dye decomposition follows the order cationic Rh B > anionic methyl orange. Finally, using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species during the degradation reaction of Rh B.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yong Xia,Libo Zhao,Yunyun Luo,Rahman Hebibul,Jiuhong Wang,Lei Li,Guoxi Luo,Xiangyang Zhou,Zhuangde Jiang
Unlike previous work generally adopting high temperature annealing (≥500 °C) to suppress defects in hydrothermal grown ZnO, this work suppressed ZnO defects by optimizing overall process parameters of low temperature electrospinning-hydrothermal hybrid process (≤300 °C) with Taguchi method and Analysis of Variance (ANOVA). Sum ratio of defect peaks to eigen peaks (SRDE) in room-temperature photoluminescence (PL) spectrum was proposed to evaluate defect conditions in 27 experiments (L 27 (3 8 )). With the optimal process, good crystal quality (SRDE = 0.31) was achieved at low temperature (200 °C), of which the SRDE decreased by 68.04% compared with the initial counterpart. Then confirmation experiment was conducted to validate the selected levels, and results of signal-to-noise ratio (SNR) showed good agreement with the predicted ones. Besides, the response time and recovery time of the ZnO photodetectors with optimal process were decreased by 72.5% and 79.3%, respectively, compared with the initial ones. This method can also be used to fabricate ZnO materials with other wanted defect features.
研究领域:
材料科学
·
光电应用
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 4
·2231-2246
·
IF 1.843
Luo Qiuzi,Sun Yihua,Guo Jin,Zhang Jiangyu,Fang Liang
The properties of ZnO nanoparticles doped with titanium ions (Ti 4+ ) and gallium ions (Ga 3+ ) were modified by sol–gel method. Considering the ion radius of doped metal elements, the radius of Zn ions and the doping limit of ZnO, the doping rate of Ti is fixed at 1 atom%, and the optimal doping amount of Ga is discussed. The Ga/Ti co-doped ZnO nanoparticles were characterized by X-ray diffraction (XRD), ultraviolet/visible spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and infrared spectroscopy. XRD results show that Ga/Ti co-doped ZnO has hexagonal wurtzite phase structure. With the increase of Ga doping concentration, the particle size of ZnO decreases. Through photoluminescence analysis, it is found that the absorption of Ga/Ti co-doped ZnO in the visible region moves to the long wave direction. In addition, with the increase of Ga doping, the particle size of GTZ powder first decreases and then increases, the band gap also decreases and then increases. When the doping amount of Ga is 1.5 atom%, the photocatalytic activity is the best. The degradation rate of MB was 90% within 2.5 h. Ga/Ti co-doped ZnO nanoparticles have good photocatalytic properties and low cost. They are a promising catalyst for wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Jun Zhang,Wei Zuo,Lingchao Kong,Hao Cui
In this study, a newly-designed Z-scheme g-C 3 N 4 @ZnO heterostructure was synthesized by 3D ZnO controllable deposition on 2D g-C 3 N 4 nanosheets using thermal atomic layer deposition. The activity of 2D/3D g-C 3 N 4 @ZnO was evaluated by photocatalytic degradation of cephalexin under simulated sunlight. Results showed that the g-C 3 N 4 @ZnO photocatalyst achieved 98.9% degradation and 72.8% mineralization of cephalexin within 60 min of illumination. This degradation process fitted to the pseudo first order dynamic model with reaction rate constant of 0.0735 min −1 , 5.4 and 8.1 times higher than that of pure g-C 3 N 4 and ZnO, respectively. Consecutive degradation experiments revealed the excellent stability and recyclability of 2D/3D g-C 3 N 4 @ZnO photocatalyst. Mechanism exploration found the enhanced photocatalytic activity was mainly ascribed to the strong oxidizability of active species generated on Z-scheme g-C 3 N 4 @ZnO. Besides, the oxidative species, especially h + and · OH played significant roles in the degradation process. Moreover, the degradation intermediates were identified through HPLC/MS/MS analysis and the possible pathway of cephalexin decomposition was proposed accordingly. The Z-scheme 2D/3D g-C 3 N 4 @ZnO was also proved effective for contaminants removal in real sewage. This study provided a new platform for controllable creation of Z-scheme photocatalysts with broad application prospects in contaminants remediation from aquatic environment under solar light.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Zeng Dong,Ziqing Du,Xingyue Wu,Kefeng Zhai,Zhaojun Wei,Marwan M.A. Rashed
The current study sought to fabricate pectin nano-films from Premna microphylla Turcz (PMTP) leaves using a combination of ZnO-carboxymethyl cellulose. The rheological and physical properties of fabricated nano-ZnO films were studied. Spectroscopy FT-IR, microscopic study (SEM), thermogravimetry (TG), and XRD were applied to characterize the fabricated film. The antibacterial activity of the nanofilm was determined using the antibacterial circle method. The findings showed that the addition of PMTP can reduce the nanofilm color, water solubility/hydrophilicity, air permeability, and ultraviolet light permeability of the nanofilm. Treatment CPN0.5 achieved the optimized Tensile strength (TS) of 4.50 Mpa, significant differences compared to CPN2 (3.99 Mpa) and CPN1 (3.65 Mpa). In addition, treatment CPN1 achieved the lowest WVP value (29.35) compared to the highest value (41.62) achieved by CPN0.5 treatment with no significant differences with CPN3 (29.7) and CPN1 (30.98) treatments. Elongation (E%) at break was the best for each CP10 (74.9) and CPN0.5 (73.03). Moreover, ZnO can enhance the nanofilm activity and the nanofilm water swelling ratio. Furthermore, adding ZnO to the nano-formula improved the antibacterial activity of the fabricated film against Staphylococcus aureus . In sum, nanofilms fabricated of PMTP and ZnO possess promising prospects as antibacterial agents in packaging applications.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Hongjian Wen,Xinhua Zhou,Zhichuan Shen,Zhicheng Peng,Huayao Chen,Li Hao,Hongjun Zhou
Polyethyleneimine (PEI) was immobilized on SBA-15 for obtaining polyethyleneimine-modified silica [email protected] ( [email protected] , [email protected] , and [email protected] ). With the coordination from PEI, zinc ions were impregnated on the [email protected] , and then, Zn 2+ [email protected] were calcined at 550 ℃ to obtain the nano zinc oxide loaded on the mesoporous silica, ZnO-SBA-15s (ZnO-SBA-1.0, ZnO-SBA-1.5, and ZnO-SBA-2.0). The anti-bacterial activity of ZnO-loaded SBA-15 was; thereafter, assessed by the zone of inhibition and enzyme labeling methods. The results confirmed that the coordination ability of the imino groups in PEI helped adsorb more zinc ions during the process of impregnation so that more nano-ZnO could be supported on the surface of SBA-15. The modification did not change the mesostructure of the two-dimensional hexagonal phase and orderliness of SBA-15. At the mass ratio of PEI:SBA-15 = 1.0:1, 1.5:1, and 2.0:1, the concentration of zinc element (wt.%) was measured by inductively coupled plasma optical emission spectrometry as 2.5, 2.56, and 3.5% for ZnO-SBA-1.0, ZnO-SBA-1.5, and ZnO-SBA-2.0, respectively. The size of inhibition of SBA-15, ZnO-SBA-0, ZnO-SBA-1.0, ZnO-SBA-1.5, and ZnO-SBA-2.0 were 0, 1.14 ± 0.01, 2.56 ± 0.01, 2.58 ± 0.01, and 2.69 ± 0.02 cm, respectively. ZnO-SBA-15s suppressed the growth of Escherichia coli compared to blank SBA-15 in a ZnO dose-dependent manner.
研究领域:
材料科学
·
纳米技术
·
生物技术
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）