Reactive Radical Species in Photocatalytic Activities of PET-Ag-TiO2 Nanoparticles Composites Under Visible Light Irradiation

Hui Zhang,Dou Wang,Cuihong Sheng,Deping Ben,Hailiang Wu,Ningtao Mao 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3

In this research, the reactive radical species in photocatalytic activities of a composite photocatalyst made fromPET filaments loaded with Ag-TiO2 nanoparticles under visible light irradiation, in comparison with those of as-modifiedAg-TiO2 nanoparticles, were reported and its photocatalytic mechanism was investigated. The PET filaments were modifiedby using tetrabutyl titanate as the TiO2 precursor and silver nitrate as the dopant in a hydrothermal process. The Ag decoratedTiO2 nanoparticles were synthesized and deposited on the surfaces of PET filaments in the hydrothermal process at 120 oCfor 180 min. The morphology, phase structure, chemical binding state, and optical properties of the PET-Ag-TiO2nanoparticles composites were systemically studied by means of field emission scanning electron microscopy (FESEM), X-raydiffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL)spectroscopy, diffuse reflectance spectroscopy (DRS), and ultraviolet photoelectron spectroscopy (UPS) techniques. Thephotocatalytic activities of the PET-Ag-TiO2 nanoparticles composites were evaluated in the photodegradation of bothmethylene blue (MB) and methyl orange (MO) dyes under visible light irradiation. It was found that, unlike in the asobtainedTiO2 nanoparticles and Ag decorated TiO2 nanoparticles, the photoinduced holes (h+) were the major reactiveradical species in both PET-Ag-TiO2 composite photocatalyst and the PET filaments loaded with TiO2 nanoparticles in theMB photodegradation process. The experimental results also indicated that the PET-Ag-TiO2 nanoparticles composites led tothe improvement of the separation efficiency of photogenerated electron-hole pairs. The enhanced photocatalytic activity ofthe PET filaments coated with Ag decorated TiO2 nanoparticles was ascribed to both the incorporation of Ag nanoparticlesinto TiO2 nanoparticles and the possible infiltration of Ag/Ti nanoparticles into PET polymers. In addition, the wavelengthand intensity of monochromatic light had great influences on the photodegradation rate of dye used, which was closelycorrelated with the maximum absorption wavelength of the dye to be degraded.

The Role of Cotton Fibers in Mediating the Energy Band Structure of TiO2-BiFeO3 Heterojunction in Cotton-TiO2-BiFeO3 Composites for Its Photodegradation of Congo Red Dyes and Photoreduction of Cr(VI) Ions

Wendou Chen,Hui Zhang,Wenming Li,Li Mengyang,Hailiang Wu,Ningtao Mao 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8

TiO2-based heterojunctions loaded on organic templates (e.g., cotton fabrics) are found to have improvedphotocatalytic activities. However, the role of fibrous templates on their photocatalytic properties has hardly beeninvestigated. In this paper, TiO2-BiFeO3 heterojunction (TiO2-BFO) was immobilized on cotton fibers in hydrothermalprocess. The structures of both TiO2-BFO and cotton-TiO2-BFO composites (C-TiO2-BFO) were systematicallycharacterized. Their photodegradation of Congo red (CR) dyes and photoreduction of Cr(VI) ions under visible lights wereanalyzed. Their active species were identified via trapping experiments and electron spin resonance spectra, and their energyband structures were examined via the density functional theory (DFT). Experimental results indicated that in comparisonwith the TiO2 loaded cotton fibers (C-TiO2), the superior photocatalytic properties of C-TiO2-BFO were attributed to itssubstitutional doping of C/O of cotton into BFO in the TiO2-BFO, which resulted in the narrowed band-gap, the strong lightharvestingcapability, and the fast separation of photoinduced electron-hole pairs of C-TiO2-BFO. Importantly, DFTcalculations testified that the energy band structure of TiO2-BFO could be mediated by constructing the built-in electric fieldbetween TiO2-BFO and cellulose cotton. The hole species were the dominant radicals in the C-TiO2-BFO, while 1O2 specieswere the main radicals in the TiO2-BFO in CR photodegradation process.

An experimental study on the ballistic performance of FRP-steel plates completely penetrated by a hemispherical-nosed projectile

Changhai Chen,Xi Zhu,Hailiang Hou,Lijun Zhang,Xiaole Shen,Ting Tang 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.16 No.3

Experiments were carried out to investigate the ballistic performance of fiber reinforced plastic(FRP)-steel plates completely penetrated by hemispherical-nosed projectiles at sub-ordnance velocities greater than their ballistic limits. The FRP-steel plate consists of a front FRP laminate and a steel backing plate. Failure mechanisms and impact energy absorptions of FRP-steel plates were analyzed and compared with FRP laminates and single steel plates. The effects of relative thickness, manufacturing method and fabric type of front composite armors as well as the joining style between front composite armors and steel backing plates on the total perforation resistance of FRP-steel plates were explored. It is found that in the case of FRP-steel plates completely penetrated by hemispherical-nosed projectiles at low velocities, the failure modes of front composite armors are slightly changed while for steel backing plates, the dominate failure modes are greatly changed due to the influence of front composite armors. The relative thickness and fabric type of front composite armors as well as the joining style of FRP-steel plates have large effects whereas the manufacturing method of front composite armors has slight effect on the total perforation resistance of FRP-steel plates.

Finite groups all of whose maximal subgroups are SB-groups

Pengfei Guo,Junxin Wang,Hailiang Zhang 대한수학회 2014 대한수학회보 Vol.51 No.4

A finite group G is called a SB-group if every subgroup of G is either s-quasinormal or abnormal in G. In this paper, we give a complete classification of those groups which are not SB-groups but all of whose proper subgroups are SB-groups.

FINITE GROUPS ALL OF WHOSE MAXIMAL SUBGROUPS ARE SB-GROUPS

Guo, Pengfei,Wang, Junxin,Zhang, Hailiang Korean Mathematical Society 2014 대한수학회보 Vol.51 No.4

A finite group G is called a SB-group if every subgroup of G is either s-quasinormal or abnormal in G. In this paper, we give a complete classification of those groups which are not SB-groups but all of whose proper subgroups are SB-groups.

Mechanical Properties and Strengthening Mechanism of Aluminum Matrix Composites Reinforced by High-entropy Alloy Particles

Kaiguang Luo,Shilei Liu,Hanqing Xiong,Yun Zhang,Charlie Kong,Hailiang Yu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.11

1 − 6 wt% Al0.5CoCrFeNihigh-entropy alloy particles (HEAp)/AA1050 aluminum matrix composites (AMCs) were preparedby stir casting process. The effect of HEAp mass fractions on microstructure and mechanical properties of the AMCswas studied. The results showed that with the increase in HEAp, the grains were obviously refined, and the ultimate tensilestrength (UTS) was gradually increased. The AA1050 − 3 wt% HEAp AMCs had the optimum mechanical properties. ItsUTS was 115 MPa and its elongation was 32.1%. The fracture mechanism of composites changed from ductile fracture toquasi-cleavage fracture with more HEAp. A theoretical model for predicting the yield strength of composites was established. The theoretical values were in good agreement with experimental results, and the average error between theoreticaland experimental values was 4.2%.

3D-QSAR and Molecular Docking Studies on Benzotriazoles as Antiproliferative Agents and Histone Deacetylase Inhibitors

Xiaolin Li,Jie Fu,Wei Shi,Yin Luo,Xiaowei Zhang,Hailiang Zhu,Hongxia Yu 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.8

Benzotriazole is an important synthetic auxiliary for potential clinical applications. A series of benzotriazoles as potential antiproliferative agents by inhibiting histone deacetylase (HDAC) were recently reported. Threedimensional quantitative structure-activity relationship (3D-QSAR), including comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA), were performed to elucidate the 3D structural features required for the antiproliferative activity. The results of both ligand-based CoMFA model (q2 = 0.647, r2 = 0.968, r2 pred = 0.687) and CoMSIA model (q2 = 0.685, r2 = 0.928, r2 pred = 0.555) demonstrated the highly statistical significance and good predictive ability. The results generated from CoMFA and CoMSIA provided important information about the structural characteristics influence inhibitory potency. In addition, docking analysis was applied to clarify the binding modes between the ligands and the receptor HDAC. The information obtained from this study could provide some instructions for the further development of potent antiproliferative agents and HDAC inhibitors.

3D-QSAR and Molecular Docking Studies on Benzotriazoles as Antiproliferative Agents and Histone Deacetylase Inhibitors

Li, Xiaolin,Fu, Jie,Shi, Wei,Luo, Yin,Zhang, Xiaowei,Zhu, Hailiang,Yu, Hongxia Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.8

Benzotriazole is an important synthetic auxiliary for potential clinical applications. A series of benzotriazoles as potential antiproliferative agents by inhibiting histone deacetylase (HDAC) were recently reported. Three-dimensional quantitative structure-activity relationship (3D-QSAR), including comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA), were performed to elucidate the 3D structural features required for the antiproliferative activity. The results of both ligand-based CoMFA model ($q^2=0.647$, $r^2=0.968$, ${r^2}_{pred}=0.687$) and CoMSIA model ($q^2=0.685$, $r^2=0.928$, ${r^2}_{pred}=0.555$) demonstrated the highly statistical significance and good predictive ability. The results generated from CoMFA and CoMSIA provided important information about the structural characteristics influence inhibitory potency. In addition, docking analysis was applied to clarify the binding modes between the ligands and the receptor HDAC. The information obtained from this study could provide some instructions for the further development of potent antiproliferative agents and HDAC inhibitors.