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Pengwei Huo,Chongyang Liu,Dongyao Wu,Jingru Guan,Jinze Li,Huiqin Wang,Qi Tang,Xiuying Li,Yongsheng Yan,Shouqi Yuan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
In this work, we reported one kind of photocatalytic and antibacterial materials, Ag/Ag2S/reducedgraphene oxide (rGO), which prepared by the hydrothermal and UV-light-assisted reduction methods. The Ag2S nanoparticals were well dispersed on the surface of rGO as revealed by series ofcharacterization. The obtained Ag/Ag2S/rGO photocatalyst showed excellent photocatalytic degradationefficiency of 87.6% for ciprofloxacin (CIP) under visible light irradiation and outstanding antibacterialactivity for Escherichia coli (E. coli) which reached to 97.76% in 24 h. The trapping of active species showedthat the hydroxyl radicals, holes and superoxide radicals played important roles in the photocatalyticdegradation of CIP processes.
Pengwei Huo,Yanfeng Tang,Mingjun Zhou,Jinze Li,Zhefei Ye,CHANGCHANG MA,Longbao Yu,Yongsheng Yan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
ZnWO4-CdS heterostructure photocatalysts have been successfully synthesized by hydrothermalmethod with assembling CdS on the surface of ZnWO4. The obtained composite photocatalysts werecharacterized by X-ray diffraction, transmission electron microscopy, Raman, thermo-gravimetricanalysis, UV–vis diffuse reflectance spectroscopy, photoluminescence and photocurrent measurement. The results show that the interface between ZnWO4 and CdS is well formed, and the CdS nanoparticlesare uniformly distributed onto ZnWO4 nanorods which could facilitate charge transfer and reducerecombination of photo-generated electrons and holes. Compared with pure ZnWO4 and CdS, the aspreparedheterostructure photocatalysts exhibit excellent photostability and photodegradation abilityof ciprofloxacin (CIP) under visible light irradiation.
Hu, Pengwei,Zheng, Dewen,Xian, Yuxi,Hu, Xianhai,Zhang, Qian,Wang, Shanyu,Li, Mingjun,Cheng, Congliang,Liu, Jin,Wang, Ping Materials Research Society of Korea 2021 한국재료학회지 Vol.31 No.6
Bi<sub>2</sub>MoO<sub>6</sub> (BMO) via the structure-directing role of CO(NH<sub>2</sub>)<sub>2</sub> is successfully prepared via a facile solvothermal route. The structure, morphology, and photocatalytic performance of the nanoflake BMO are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), fluorescence spectrum analysis (PL), UV-vis spectroscopy (UV-vis) and electrochemical test. SEM images show that the size of nanoflake BMO is about 50 ~ 200 nm. PL and electrochemical analysis show that the nanoflake BMO has a lower recombination rate of photogenerated carriers than particle BMO. The photocatalytic degradation of tetracycline hydrochloride (TC) by nanoflake BMO under visible light is investigated. The results show that the nanoflake BMO-3 has the highest degradation efficiency under visible light, and the degradation efficiency reached 75 % within 120 min, attributed to the unique hierarchical structure, efficient carrier separation and sufficient free radicals to generate active center synergies. The photocatalytic reaction mechanism of TC degradation on the nanoflake BMO is proposed.
Huiqin Wang,Pengwei Huo,Jinze Li,Mingjun Zhou,Qingfeng Guan,Ziyang Lu,Yongsheng Yan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
The Ag2O/SWNTs photocatalysts were prepared by precipitated method, the photocatalysts werecharacterized by XRD, SEM, TEM, EDS, BET, UV–vis DRS, XPS, PL and Raman. The photocatalytic activitieswere evaluated by degradation of tetracycline. The results showed that the composited photocatalystswere successfully prepared, the responded light was enhanced with increasing the supported dosage ofAg2O, and the photocatalytic activity was also improved. The enhanced photocatalytic activity wasattributed to the synergy effect of SWNTs and Ag2O, the recycled degradation of tetracycline exhibitedstability of Ag2O/SWNTs composited photocatalysts. Finally, the possible mechanism for transferredprocesses of photoelectrons and photoholes were proposed.
Fault Detection and Diagnosis for Delay-Range-Dependent Stochastic Systems Using Output PDFs
Liping Yin,Pengwei Zhu,Tao Li 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.4
This paper investigates a new fault detection and diagnosis(FDD) scheme for delay-range-dependentstochastic systems. Compared with classical FDD problem, the measurable information in this paper is supposedto be the output probability density function(PDF), rather than the output itself. By using the square root B-splineapproximation technique, the dynamic weight model of the output PDFs is established and the considered problemis converted into a nonlinear FDD problem for stochastic systems with delays. The main objective of this paper isto construct a filter based residual generator such that the fault can be detected and estimated. The FDD criteria isprovided on the basis of linear matrix inequalities(LMIs). Besides, to improve the FDD performance, the tuningparameters, slack variables as well as the free-weighting matrices are applied to optimize the FDD criteria. Finally,the simulations are given to demonstrate the effectiveness of the proposed method.
Dongyao Wu,Jinze Li,Jingru Guan,Chongyang Liu,Xiaoxu Zhao,Zhi Zhu,CHANGCHANG MA,Pengwei Huo,Chunxiang Li,Yongsheng Yan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
An Intercalated heterostructural g-C3N4/TiO2/HNTs supported photocatalyst was successfully prepared via sol–gel and calcination methods. The introduction of HNTs and the g-C3N4-TiO2 heterojunction effectively enhanced the charge transfer and separation efficiency of photogenerated electron–hole pairs, which endued the g-C3N4/TiO2/HNTs hybrid material with an outstanding photoelectric performance and good stability. And an obviously enhanced photocatalytic activity was exhibited by photodegrading ciprofloxacin compared with pure TiO2. Furthermore, the main active species were detected through trapping experiment and ESR spin-trap technique with DMPO, which confirmed that the O2− and the h+ were the main active species in the photocatalytic system.
Yinhua Jiang,Yingying Luo,Ziyang Lu,Pengwei Huo,Weinan Xing,Ming He,Jiqin Li,Yongsheng Yan 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
1-Methylimidazole-2-thiol, as a kind of mercaptans, is a typical organic pollutant which has not been efficiently removed. In this study, titanium dioxide (TiO 2 ) photocatalyst based on magnetic multi-walled carbon nanotubes (MWCNTs) was synthesized via hydrothermal and sol-gel methods. The as-prepared photocatalyst was extensively characterized by X-ray diffraction (XRD), X-ray energy diffraction spectrum (EDS), transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectra, UV-Vis diffuse reflectance spectra (UV-vis DRS) and vibrating sample magnetometer (VSM). This photocatalyst of TiO 2 /Fe 3 O 4 /MWCNTs was proved to exhibit high photocatalytic efficiency and the photodegradation rate could reach nearly 82.7% for the degradation of 1-methylimidazole-2-thiol under ultraviolet irradiation. In addition, the results demonstrated that inorganic ions had a negative impact on photodegradation of 1-methylimidazole-2-thiol to varying degrees. Moreover, pH had a great and complex effect on photocatalytic degradation of 1-methylimidazole-2-thiol under ultraviolet irradiation.
Multivariate analysis of original identification and chemical markers exploration of Chinese ginger
Mengqing Guo,Qian Shen,Yu Wu,Lili Li,Lin Zhang,Yu Wang,Yanjun Zhang,Pengwei Zhuang,Hong Guo 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.7
Ginger (Zingiber officinale) is one of the most widely consumed dietary supplements. However, the content of active ingredients varied greatly from place to place. In this study, we first identified and compared the compositions of ginger samples from six different origins. Then, we evaluated the anti-inflammatory activity of different samples in LPS-stimulated RAW264.7 cells. The results indicated that highly variable in chemical composition and activity for ginger from different origin. Further, correlation analysis showed that isoborneol, terpineol, α-curcumene, germacrene D, α-elemol and 8-shogaol exhibited a strong correlation with inflammatory factors, which could be used as potential chemical markers to evaluate quality and distinguish source of ginger. Finally, comprehensive evaluation found that the ginger from Sichuan exerts stronger anti-inflammatory properties. This study will help to select ginger varieties with excellent characteristics, provide theoretical basis for the development and utilization of ginger.
Jiang, Yinhua,Luo, Yingying,Lu, Ziyang,Huo, Pengwei,Xing, Weinan,He, Ming,Li, Jiqin,Yan, Yongsheng Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
1-Methylimidazole-2-thiol, as a kind of mercaptans, is a typical organic pollutant which has not been efficiently removed. In this study, titanium dioxide ($TiO_2$) photocatalyst based on magnetic multi-walled carbon nanotubes (MWCNTs) was synthesized via hydrothermal and sol-gel methods. The as-prepared photocatalyst was extensively characterized by X-ray diffraction (XRD), X-ray energy diffraction spectrum (EDS), transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectra, UV-Vis diffuse reflectance spectra (UV-vis DRS) and vibrating sample magnetometer (VSM). This photocatalyst of $TiO_2$/$Fe_3O_4$/MWCNTs was proved to exhibit high photocatalytic efficiency and the photodegradation rate could reach nearly 82.7% for the degradation of 1-methylimidazole-2-thiol under ultraviolet irradiation. In addition, the results demonstrated that inorganic ions had a negative impact on photodegradation of 1-methylimidazole-2-thiol to varying degrees. Moreover, pH had a great and complex effect on photocatalytic degradation of 1-methylimidazole-2-thiol under ultraviolet irradiation.
Longbao Yu,Zhefei Ye,Jinze Li,Chunhong Ma,CHANGCHANG MA,XINLIN LIU,Huiqin Wang,Lili Tang,Pengwei Huo,Yongsheng Yan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6
A series of hamburger-like Ag@ZnO/C core–shell plasmonic photocatalysts have been synthesized via a simple solvothermal method for degradation of tetracycline (TC) under visible light irradiation, possessing high photocatalytic activity and good stability. The presence of localized surface plasmon resonance (LSPR) in the Ag core has increased the photocatalytic activity over an extended wavelength range. The plasmon-induced resonant energy transfer (PIRET) and direct electron transfer (DET) have facilitated the excitation and separation of photogenerated e-/h+pairs, which has been further confirmed by electrochemical investigations. The presences of hydroxyl radicals ( ·OH), superoxide radicals ( · O-2) and singlet oxygen (1O2) in the photocatalytic reaction system of Ag@ZnO/C photocatalyst have been demonstrated by electron spin resonance (ESR) measurements. All of the experiment results indicate that the ternary structure of Ag@ZnO/C can effectively enhance the photocatalytic activity. Furthermore, the effects of introduced Ag contents and carbon source dosage were researched by comparative photocatalytic experiments, and the potential structures of photodegradation products were studied by HPLC-MS.