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Guofu Huang,Kun Liu,Yaseen Muhammad,Tian Fu,Linxing Wang,Jiajing Nong,Shiqi Xu,Luying Jiang,Zhangfa Tong,Hanbing Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
Utilizing the cost-effective natural clay and surface heterojunction engineering to synergistically constructan efficient heterojunction system and promote the separation of photogenerated charges is anappealing strategy for achieving superior photocatalytic activity. In this study, BiOBr/BiOI step-scheme(S-scheme) heterojunction in-suit grown on magnetized bentonite (MBT) was first engineered via facileand mild coprecipitation coupling microwave solvothermal process. The optimized magnetic bentonite/BiOBr/BiOI (MBT25/BiOBr/BiOI, the mass ratio of MBT to BiOBr/BiOI was 25%) attained the largest reactionrate constant (k = 0.021 min1) in tetracycline (TC) photocatalytic degradation within 80 min visible-lightirradiation. In addition, the reaction rate constant k of MBT25/BiOBr/BiOI for TC degradation was 10.51folds higher than that of pristine BiOI. Significantly, the characterization results demonstrated thatMBT effectively assisted the pinecone-like morphology formation of BiOBr/BiOI and endowed the wonderfulmagnetic-separation ability for MBT25/BiOBr/BiOI. Additionally, MBT ingeniously introduced atthe interface could couple with S-scheme heterojunction between BiOBr and BiOI to synergistically boostthe separation and transfer of photogenerated charges. As expected, superior photochemical propertiesand efficient production of active species over MBT25/BiOBr/BiOI were confirmed. Notably, recyclingexperiments verified the wonderful photocatalytic stability and high recovery efficiency of MBT25/BiOBr/BiOI. Furthermore, the abundant O2and OH active species led to hydroxylation, dealkylation,deamidation and ring opening of TC molecules. A synergistically enhanced mechanism over S-schemeMBT25/BiOBr/BiOI was clarified based on band structure calculations. This study offers an innovative perspectiveto design multifunctional photocatalysts with superior activity by integrating properties of magnetizedclay and S-scheme heterojunction.
Xiaoyan Peng,Yao Li,Guofu Xu,Jiwu Huang,Zhimin Yin 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
The mechanical properties, corrosion behavior and microstructures of the Al–Zn–Mg–Cu alloy under various ageing treatmentswere investigated comparatively. The results show that the tensile strength and corrosion resistance are stronglyaff ected by the precipitate state. Massive fi ne intragranular precipitates contribute to high strength. Discontinuous coarsegrain boundary precipitates containing high Cu content, as well as the narrow precipitate free zone, result in low corrosionsusceptibility. After the non-isothermal ageing (NIA) treatment, the tensile strength of 577 MPa is equivalent to that of579 MPa for the T6 temper. Meanwhile, the stress corrosion susceptibility r tf and the maximum corrosion depth are 97.8%and 23.5 μm, which are comparable to those of 92.8% and 26.7 μm for the T73 temper. Moreover, the total ageing timeof the NIA treatment is only 7.25 h, which is much less than that of 48.67 h for the retrogression and re-ageing condition.
Cai Shuyu,Wang Guofu,Xu Hua,Liu Jianxin,Luo Jie,Shen Yi 한국식물학회 2021 Journal of Plant Biology Vol.64 No.6
Chilling stress is a major abiotic constraint that affects sweet corn seedling establishment. Spermidine (Spd) is known to participate in the cold stress response in plants, nonetheless, the molecular mechanisms are largely unknown. The present study reported that exogenous Spd not only stimulated seedling growth but also enhanced photosynthetic attributes under chilling stress. Further analysis revealed that Spd application resulted in depressed abscisic acid (ABA) content and affected the expression of ABA-responsive genes. The augmented antioxidant enzymes activities, coupled with declined reactive oxygen species (ROS) content, were observed in response to Spd treatment under chilling stress. Moreover, Spd up-regulated the transcription levels of some Ca2+ transport-related genes. We propose that Spd contributes to cold tolerance in sweet corn seedlings via the regulation of genes involved in the ROS, ABA pathways and Ca2+ transport.
Long Zhao,Yuxiang Chen,Yuanming Liu,Guofu Zhang,Juncong She,Shaozhi Deng,Ningsheng Xu,Jun Chen 한국물리학회 2017 Current Applied Physics Vol.17 No.1
Addressable field emitter arrays (FEAs) have important applications in vacuum electronic devices. However, it is important to integrate nanowire emitters into a gated structure without influencing the device structure and maintain the excellent field emission properties of nanowire emitters in the FEAs after the fabrication process. In this study, gate-structure ZnO nanowire FEAs were fabricated by a microfabrication process. The structure combines a planar gate and an under-gate, which is compatible with the preparation of ZnO nanowire emitters. The effect of electrode materials on the field emission properties of ZnO nanowires was studied using a diode structure, and it was found that ZnO nanowire pads on indium-tin-oxide (ITO) electrode showed better field emission performance compared with chromium (Cr) electrode. In addition, effective emission current modulation by the gate voltage was achieved and the addressing capability was demonstrated by integrating the ZnO nanowire FEAs in a vacuum-encapsulated field emission display. The reported technique could be a promising route to achieve large area addressable FEAs.
Dan Xiao,Xiaoyan Peng,Xiaopeng Liang,Ying Deng,Guofu Xu,Zhimin Yin 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
Hot compression tests of as-homogenized Al-Zn-Mg-Cu alloy were performed at the deformation temperaturerange of 350-450 °C and the strain rate range of 0.001-1 s-1. The Arrhenius-type constitutive equation and theAvrami-type model were established to predict the flow behaviors of the alloy respectively. The processing map atthe true strain of 0.92 was developed to evaluate the workability of the alloy and the related microstructures wereinvestigated. The results show that the Avrami-type model has a higher accuracy to predict flow stress than theArrhenius-type constitutive equation. The stable deformation occurs under high temperature or low strain ratemainly owing to the dynamic recrystallization. Flow instability is prone to occur under the condition of low temperatureand high strain rate due to the initiation and the propagation of micro-cracks. According to the processingmap and corresponding microstructure characteristics, the optimum processing parameters are in the temperaturerange of 380-405 °C and the strain rate range of 0.006-0.035 s-1.