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XINLIN LIU,Yongsheng Yan,Qian Wang,Peng Lv,GUANXIN YAO,CHANGCHANG MA,Yan Yan,Yanfeng Tang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
A new-type photocatalyst of cadmium sul¯de carbon nanotubes (CdS/CNTs) was prepared bythe hydrothermal method. This as-prepared CdS/CNTs composite photocatalyst was proved toexhibit an excellent photocatalytic activity for degradation of tetracycline (TC). Specially, the95%-CdS – 5%-CNTs composite photocatalyst played the best degradation rate (81.2%) in 60 minunder the visible light irradiation. Moreover, this 95%-CdS – 5%-CNTs composite photocatalystpossessed great stability and could be used at least four cycles with almost no loss of photo-catalytic e±ciency. Furthermore, the as-synthesized CdS/CNTs composite photocatalyst wascharacterized by X-ray di®raction (XRD), transmission electron microscopy (TEM), UV-Visdi®used re°ectance spectra (UV-Vis), Raman and thermal gravimetry (TG). In addition, thepossible mechanism and kinetics of photodegradation of TC with CdS/CNTs photocatalyst wasalso discussed.
Ping Yu,Yongsheng Yan,Qilong Sun,Jianfeng Li,Zhenjiang Tan,Chunxiang Li 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
In the work, we reported an effective method for the preparation of surface molecularly imprintedpolymers based on bacillus as substrate material with superparamagnetic property throughminiemulsion polymerization. Then, the obtained magnetic surface molecularly imprinted polymers(MMIPs) were evaluated as adsorbents for selective recognition 2,4,6-trichlorophenol (2,4,6-TCP) fromaqueous medium. The resulting MMIPs were characterized by several techniques including FT-IR, SEM,TEM, Raman, XRD, VSM and TGA. The results demonstrated rod-shaped MMIPs was covered withimprinted layer, and exhibited chemical stability and good magnetic sensitivity. Batch mode of bindingstudies were carried out to determine the equilibrium isotherm, kinetics, selectivity adsorption andregeneration of MMIPs toward 2,4,6-TCP. The results indicated that the selective adsorption behaviors ofMMIPs were well described by the Langmuir isotherm model and the pseudo-second-order kineticsmodel. The specific adsorption capacity of MMIPs was 45.16 mg g 1 at 298 K, which was 2.15 timeshigher than that of magnetic non-imprinted polymers (MNIPs). The selective recognition studiesdemonstrated the outstanding affinity and selectivity toward 2,4,6-TCP in the presence of competitivephenols. The regeneration study showed excellent adsorption capacity even after five regenerationcycles. In addition, MMIPs were successfully applied to the extraction of 2,4,6-TCP from milk sample.
XIAOLEI SU,YONGSHENG TAN,YAN JIA,KAILI ZHAO,SONGTAO LIU,XINHAI HE,CHONG FU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
Cu-doped SiC nanopowders have been prepared via combustion synthesis of the silicon andcarbon system in a 0.1 MPa nitrogen atmosphere under di®erent reaction time, using copper asthe dopant and PTFE as the chemical activator, respectively. X-ray di®raction, scanning elec-tronic microscope and Raman spectra have been used to characterize the phase and morphologyof prepared nanopowders. Results indicate that the lattice constant of prepared Cu-doped SiCnanopowder decreases with extending reaction time. The prepared nanopowders have ¯nespherical particles and narrow particle size distribution and the particle size increases withincreasing reaction time. The electric permittivities of prepared Cu-doped SiC nanopowders inthe frequency range of 8.2 – 12.4 GHz have been determined. The real part " 0, imaginary part " 00and dielectric loss tg ? of complex permittivity decrease with increasing reaction time. All pre-pared Cu-doped SiC nanopowder exhibits good microwave absorption property in the frequencyrange of 8.2 – 12.4 GHz.
( Bo Wang ),( Ying Yan ),( Jing Xu ),( Xiaoyan Fu ),( Hongjuan Han ),( Jianjie Gao ),( Zhenjun Li ),( Lijuan Wang ),( Yongsheng Tian ),( Rihe Peng ),( Quanhong Yao ) 한국미생물 · 생명공학회 2018 Journal of microbiology and biotechnology Vol.28 No.12
Laccases can oxidize a variety of phenolic and non-phenolic substrates including synthetic dyes. In this research, a laccase gene Lcc9 from Laccaria bicolor was chemically synthesized and optimized to heterogeneous expression in Pichia pastoris and Arabidopsis thaliana. The properties of recombinant laccase expressed by P. pastoris were investigated. The laccase activity was optimal at 3.6 pH and 40°C. It exhibited K<sub>m</sub> and V<sub>max</sub> values of 0.565 mmol l<sup>-1</sup> and 1.51 μmol l<sup>-1</sup> min<sup>-1</sup> for ABTS respectively. As compared with untransformed control plants, the laccase activity in crude extracts of transgenic lines exhibited a 5.4 to 12.4-fold increase. Both laccases expressed in transgenic P. pastoris or A. thaliana could decolorize crystal violet. These results indicated that L. bicolor laccase gene may be transgenically exploited in fungi or plants for dye decolorization.
Yilin Wu,Ming Yan,Jia Gao,Peng Lv,XINLIN LIU,Chunxiang Li,Yongsheng Yan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08
Development of efficient visible light driven photocatalysts for water splitting has attracted great research interest. Herein, a novel H2-producing nitrogen-doped graphene quantum dots (NGQDs)-Cu2O was successfully constructed and synthesized. The as-prepared NGQDs-Cu2O photocatalysts were benefited for light harvesting and charge separation and showed highly efficient photocatalytic property for hydrogen production by water splitting. Results displayed that the amount of NGQDs exhibited significant influence for H2 production, and the optimum sample of 3%NGQDs-Cu2O performed the highest hydrogen-evolution rate of 22.6 μmol h -1 g -1, which was about 2 times higher than that of the pure Cu2O (10.1 μmol h -1 g -1). By further study, the enhanced photocatalytic performance could be ascribed to the crucial role of NGQDs, which widely improve the separation of photogenerated electron-hole pair's.
Minjia Meng,Yonghai Feng,Weisheng Guan,Yan Liu,Yanfang Xi,Yongsheng Yan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Highly effective molecularly imprinted nano-polymer on wollastonite (nano-WMIP) was prepared byimprinting technique using oil-in-water emulsion polymerization in the presence of salicylic acid (SA) astemplate. The adsorption behavior of nano-WMIP including adsorption kinetic, isotherms, selectiveadsorption, recognition, and effects of initial pH, ionic strength, initial concentration, adsorptiontemperature, and amount of adsorbents were investigated in detail. Moreover, the selective recognitionof nano-WMIP was further investigated by HPLC toward analogs of SA. The relative selectivitycoefficients for p-HB, MS, and MP were 113.4, 8.049, and 6.239, respectively, showing that much higherselectivity of SA on nano-WMIP was obtained than that of wollastonite-based non-imprinted polymer(nano-WNIP).
XINLIN LIU,Yingying Qin,Mingjun Zhou,Yongsheng Yan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11
A unique CdS/Fe3O4/rGO composite photocatalyst is successfully synthesized by the microwave method. It displays promising photocatalytic activity towards the photo-degrading of tetracycline (TC) in aqueous solution, the degradation rate of TC is 69% with adding 0.1 g CdS/Fe3O4/rGO photocatalyst into 20 mg/L tetracycline for 2 h under visible light irradiation. Furthermore, the mechanism was systematically investigated by active species trapping experiment. It can be known that e? was the major active species in the photodegradation process and the possible process of charge transfer for CdS/Fe3O4/rGO was proposed based on the experimental results. The as-prepared samples were carefully evaluated by XRD, TEM, XPS, VSM, PL spectra, Raman spectrometer.
Ion-imprinted antifouling nanocomposite membrane for separation of lithium ion
Dongshu Sun,Tianyu Zhou,Yang Lu,Yongsheng Yan,Chunbo Liu,Guangbo Che 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9
Membrane fouling is a primary challenge restricting the practical application of membrane separation technology. Inspired by the idea that improving hydrophilicity would lead to antifouling performance of membrane material. In this work, ion-imprinted antifouling nanocomposite membrane (LiI-NcMs) blended with GO and TiO2 nanomaterialwas fabricated for selective separation of lithium ion. As a result, markedly improved hydrophilicity was achievedon LiI-NcMs (55.1o for contact angle). LiI-NcMs also showed good selective adsorption capacity in the mixed solutionof Mg2+ and Li+. Moreover, LiI-NcMs exhibited superior stability; after 20 adsorption/desorption cycles a maximumadsorption capacity of 88.1% can be maintained. This work demonstrates a new and facile approach to prepare novelmembrane separation material for a particular substance for efficient selective separation in industrial applications.
Yao Lu,Dongshu Sun,Yang Lu,Yongsheng Yan,Bo Hu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
A surface hydrophilic and antifouling imprinted composite membrane based on zwitterion and dopamine for selective adsorption Li+ from compound has great potential. We investigated the selective adsorption amount for lithium from high Mg2+ and low Li+; the resulting displayed both excellent adsorption amount of Li+ and high selective adsorption efficiency of the fabricated membranes from the compound. Relatively lower contact angle of 50.7o and higher membrane flux value of 11.78mL cm2 min1 were obtained, which indicated the imprinted composite membrane possessed high hydrophilicity. In the BSA protein adsorption experiments, the anti-pollution performance of the imprinted composite membrane was greatly improved. Moreover, the results on perm-selectivity and regeneration ability are 8.94 and 91.4%. Overall results suggest that zwitterion and dopamine can be considered effective for increasing the hydrophilicity and anti-pollution capacity. Moreover, the imprinted composite membranes could be used for selective adsorption of Li+ effectively.
Yanhua Cui,Minjia Meng,Dongshu Sun,Yan Liu,Jianming Pan,Xiaohui Dai,Yongsheng Yan 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
We developed a simple phase inversion technique to prepare molecularly imprinted membrane (MIM) at room temperature for membrane selective adsorption and separation of methyl p-hydroxybenzoate (M4HB). The prepared SMIP-MIM was characterized by SEM, FT-IR, TGA. Compared with non-imprinted membrane (NIM1-5) adsorbent, SMIP-MIM1-5 adsorbent with high specific surface area and showed higher binding capacity, faster kinetic and better selectively adsorption capacity for M4HB. The maximum isotherm adsorption capacity for M4HB of SMIPMIM4 was 3.519mg·g−1, and the experimental data was well fitted to the slips model by multiple analysis. The maximum kinetic adsorption capacity and equilibrium adsorption time for SMIP-MIM4 were 1.335mg·g−1 and 160 min, respectively. The mechanism for dynamic adsorption of M4HB onto SMIP-MIM4 was found to follow pseudo-firstorder model and pseudo-second-order model. Additionally, the permeability separation factor of SMIP-MIM4 for M4HB compared to a structural analogues methyl 2-hydroxybenzoate (M2HB) could reach 2.847. The adsorption capacity of SMIP-MIM4 for M4HB and M2HB was 0.549mg·cm−2 and 1.563mg·cm−2, respectively. The adsorption behavior of M4HB through SMIP-MIM4 followed the retarded permeation mechanism.