Biomass-Based Synthesis of Green and Biodegradable Molecularly Imprinted Membranes for Selective Recognition and Separation of Tetracycline

Wendong Xing,Yilin Wu,Jian Lu,Xinyu Lin,Chao Yu,Zeqing Dong,Yongsheng Yan,Chunxiang Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.02

Aggravating environmental problems have driven the unprecedented development of sustainable materials. Treatments of environmental pollutants with biomass-based sustainable materials are catching attention of more researchers. In the present work, a biomass-based strategy was developed to prepare sustainable molecularly imprinted nanocomposite membranes (S-MINMs). Based on this strategy, biomass-activated carbon nanoparticles (ACNPs) as the porous filler were integrated into the porous cellulose acetate (CA)/chitosan (CS) hybrid membranes to synthesize renewable and easy degradable basal membranes. The specific recognition sites were fabricated from simple free radical polymerization method, and using methacrylic acid (MAA) and acrylamide (Am) as functional monomers, we obtain improved adsorption capacity on tetracycline (TC, template molecule). Performance of S-MINMs was evaluated by adsorption isotherm, adsorption kinetics, perm-selectivity, reusability and biodegradability. Results indicated that the as-prepared S-MINMs not only exhibited desirable biodegradability, but also possess superior adsorption and separation performance toward TC (15.99 mg g -1 for adsorption capacity and 4.91 for perms-selectivity factor). The method developed here shows great potential for development of sustainable membranes for selective separation of various pollutants.

Geochemistry of Late Carboniferous sedimentary rocks from the Zongwulong structural belt and adjacent areas, Qaidam Basin, China: implications for provenance and tectonic setting

Yuan Peng,Yongsheng Zhang,Jiaopeng Sun,Enyuan Xing,Huatai Yu 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.2

This paper documents the geochemistry of clastic sedimentary rocks from the Upper Carboniferous Zongwulong Group in the Zongwulong structural belt of the Qaidam Basin, NW China, in order to trace the sources of the sediments and to understand their tectonic settings at the time of deposition of the Zongwulong Group. Although the major elements differ among different samples, their low mean chemical index of alteration mean CIA = 51.04–64.79), plagioclase index of alteration (mean PIA = 51.41–69.54), and relatively high mean index of compositional variability (mean ICV = 1.18–1.56) indicate relatively low maturity and weak to moderate chemical weathering of their source. The Zr/Sc-Th/Sc diagram and relatively high mean ICV suggest that all sediments of Zongwulong Group have undergone no significant sediment recycling. All samples yield relatively high Al2O3/TiO2 ratios (16–27), strong LREE/HREE differentiation (mean LaN/YbN = 10.83–12.66), and obvious negative Eu anomalies (mean Eu/Eu* = 0.61–0.79). Combined with characteristic ratios (La/Sc, Th/Sc, Cr/Th, and Th/Co) and the provenance discriminant diagrams (Al2O3-(CaO* + Na2O)-K2O and Ni-TiO2), these results indicate felsic source rocks. Combined with the findings of previous studies, the representative values (La, Ce, ΣREE, V, Rb/Sr, Eu/Eu*, La/Sc, Th/Sc, and Zr/Th) and tectonic setting discriminants (SiO2-K2O/Na2O, Fe2O3 + MgO-Al2O3/SiO2, La/Sc-Ti/Zr, and Th-Sc-Zr/10) indicate that the Zongwulong Group sediments were deposited in a back-arc extensional basin behind the active continental margin-continental island arc tectonic setting.

EBKCCA: A Novel Energy Balanced k-Coverage Control Algorithm Based on Probability Model in Wireless Sensor Networks

( Zeyu Sun ),( Yongsheng Zhang ),( Xiaofei Xing ),( Houbing Song ),( Huihui Wang ),( Yangjie Cao ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.8

In the process of k-coverage of the target node, there will be a lot of data redundancy forcing the phenomenon of congestion which reduces network communication capability and coverage, and accelerates network energy consumption. Therefore, this paper proposes a novel energy balanced k-coverage control algorithm based on probability model (EBKCCA). The algorithm constructs the coverage network model by using the positional relationship between the nodes. By analyzing the network model, the coverage expected value of nodes and the minimum number of nodes in the monitoring area are given. In terms of energy consumption, this paper gives the proportion of energy conversion functions between working nodes and neighboring nodes. By using the function proportional to schedule low energy nodes, we achieve the energy balance of the whole network and optimizing network resources. The last simulation experiments indicate that this algorithm can not only improve the quality of network coverage, but also completely inhibit the rapid energy consumption of node, and extend the network lifetime.

ROBUST OPTIMAL PROPORTIONAL REINSURANCE AND INVESTMENT STRATEGY FOR AN INSURER WITH ORNSTEIN-UHLENBECK PROCESS

Ma, Jianjing,Wang, Guojing,Xing, Yongsheng Korean Mathematical Society 2019 대한수학회보 Vol.56 No.6

This paper analyzes a robust optimal reinsurance and investment strategy for an Ambiguity-Averse Insurer (AAI), who worries about model misspecification and insists on seeking robust optimal strategies. The AAI's surplus process is assumed to follow a jump-diffusion model, and he is allowed to purchase proportional reinsurance or acquire new business, meanwhile invest his surplus in a risk-free asset and a risky-asset, whose price is described by an Ornstein-Uhlenbeck process. Under the criterion for maximizing the expected exponential utility of terminal wealth, robust optimal strategy and value function are derived by applying the stochastic dynamic programming approach. Serval numerical examples are given to illustrate the impact of model parameters on the robust optimal strategies and the loss utility function from ignoring the model uncertainty.

Robust optimal proportional reinsurance and investment strategy for an insurer with Ornstein-Uhlenbeck process

Jianjing Ma,Guojing Wang,Yongsheng Xing 대한수학회 2019 대한수학회보 Vol.56 No.6

This paper analyzes a robust optimal reinsurance and investment strategy for an Ambiguity-Averse Insurer (AAI), who worries about model misspecification and insists on seeking robust optimal strategies. The AAI's surplus process is assumed to follow a jump-diffusion model, and he is allowed to purchase proportional reinsurance or acquire new business, meanwhile invest his surplus in a risk-free asset and a risky-asset, whose price is described by an Ornstein-Uhlenbeck process. Under the criterion for maximizing the expected exponential utility of terminal wealth, robust optimal strategy and value function are derived by applying the stochastic dynamic programming approach. Serval numerical examples are given to illustrate the impact of model parameters on the robust optimal strategies and the loss utility function from ignoring the model uncertainty.

Influence of Inorganic Ions and pH on the Photodegradation of 1-Methylimidazole-2-thiol with TiO₂ Photocatalyst Based on Magnetic Multi-walled Carbon Nanotubes

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.

Influence of Inorganic Ions and pH on the Photodegradation of 1-Methylimidazole-2- thiol with TiO2 Photocatalyst Based on Magnetic Multi-walled Carbon Nanotubes

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.