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Nitrogen and Oxygen Co-doped Porous Carbon Fabric for Efficient Removal of Formaldehyde
Tingting Chen,Xiaosai Hu,Tao Zhao,Yuanyu Ge 한국섬유공학회 2022 Fibers and polymers Vol.23 No.7
Formaldehyde can pose a huge threat to human health due to its’ carcinogenic effect. Carbon materials asadsorbents are widely applied to remove formaldehyde hazards. However, most carbon materials with disadvantages of thelimited number of surface functional groups and the lack of suitable pore structure suffer from low adsorption rate for theadsorptive removal of formaldehyde. To improve the adsorption capability, oxygen (O) and nitrogen (N) elements co-dopedporous viscose-based activated carbon fiber (N-O-ACF) was prepared via oxidation-hydrothermal treatment. First of all, theO atom can be introduced into ACF through chemical oxidation. Then, with the help of the O atom bridging effect, N atomscan be efficiently incorporated into ACF, and the content of the N element is as high as 7.13 wt.%. Thus, an improvedadsorption performance of N-O-ACF for formaldehyde removal was achieved with the support of the synergistic effect of Nand O elements. The adsorption capacity of N-O-ACF for removing formaldehyde increased up to 226 mg g-1, while only161.5 mg g-1 was obtained for original ACF. The excellent formaldehyde adsorption capacity indicates that N-O-ACF may bea promising adsorbent in the field of indoor air purification.
Tingting Chen,Yong Fan,Guangning Wang,Jing Zhang,Huixin Chuo,Ruixiao Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
The composite supercapacitor electrodes were rationally fabricated by facile electrochemical deposition of polypyrrole (PPy) on NiCo2O4 nanowire arrays which were grown radially on carbon fiber (CF). When used as electrodes in supercapacitors, the composite nanostructures demonstrated prominent electrochemical performances with a high areal capacitance (1.44 F/cm2 at a current density of 2 mA/cm2 ), a good rate capability (80.5% when the current density increases from 2 mA/cm2 to 20 mA/cm2 ), and a good cycling ability (85% of the initial specific capacitance remained after 5000 cycles at a high current density of 10 mA/cm2 ). The excellent electrochemical performance of NiCo2O4@PPy nanostructures can be mainly ascribed to the good electrical conductivity of PPy, the enhanced adherent force between electrode materials and CF to hold the electrode fragments together by means of NiCo2O4 nanowires, the short ion diffusion pathway in ordered porous NiCo2O4 nanowires and the three-dimensional nanostructures.
Tingting Chen,Guangning Wang,Qianyan Ning 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5
Electrodes of rationally designed composite nanostructures can offer many opportunities for the enhanced performance in electrochemical energy storage. This paper attempts to illustrate the design and production of NiMoO4/polypyrrole core–shell nanostructures on nickel foam to be used in supercapacitor via a facile hydrothermal and electrodeposition process. It has been verified that this novel nanoscale morphology has outstanding capacitive performances. While employed as electrodes in supercapacitors, the composite nanostructures showed remarkable electrochemical performances with a great areal capacitance (3.2 F/cm2 at a current density of 5 mA/cm2 ), and a significant cycle stability (80% capacitance retention after 1000 cycles). The above results reveal that the composite nanostructures may be a likely electrode material for high-performance electrochemical capacitors.
Xiaoqiang Chen,Tingting Chen,Jiayan Liu,Yan’an Wei,Weilong Zhou 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.1
Tea polyphenols were used as substrates and oxidized successively by polyphenol oxidase and peroxidase to prepare theabrownins (TBs-dE). The conversion rate of catechins to TBs-dE was 90.91%. The ultraviolet and infrared spectroscopic properties and zeta potential of TBs-dE were characterized. TBs-dE is more stable at pH 5.0–7.0, about 25 °C or in dark environment. Ultraviolet light and sunlight can deepen its color due to the further oxidative polymerization. Mg2+, Cu2+, and Al3+ had a significant effect on the stability of TBs-dE. The inhibitory rates of TBs-dE (1 mg/mL) against Staphylococcus aureus and Escherichia coli DH5α were 51.45% and 45.05%, respectively. After TBs-dE treatment, the cell morphology of both bacteria changed, some cell walls were blurred, and the cytoplasmic content leaked. The research results can provide theoretical support for the industrialization of theabrownins.
In vitro immunoregulatory role of recombinant Ancylostoma ceylanicum calreticulin
Tingting Zhuang,Asmaa M.I. Abuzeid,Xiaoyu Chen,Shilan Zhu,Guoqing Li 대한기생충학ㆍ열대의학회 2024 The Korean Journal of Parasitology Vol.62 No.1
Ancylostoma ceylanicum is a zoonotic soil-derived nematode that parasitizes the intestines of humans and animals (dogs and cats), leading to malnutrition and iron-deficiencyanemia. Helminth parasites secrete calreticulin (CRT), which regulates or blocks thehost’s immune response. However, no data on A. ceylanicum calreticulin (Ace-CRT) areavailable. We investigated the biological function of recombinant Ace-CRT (rAce-CRT). rAce-CRT showed reliable antigenicity and stimulated the proliferation of mouse splenocytes and canine peripheral blood mononuclear cells. Quantitative reverse-transcriptionPCR assays revealed that rAce-CRT primarily promoted the expression of T helper 2 cytokines, particularly IL-13, in canine peripheral blood lymphocytes. rAce-CRT inhibitedcomplement-mediated sheep erythrocyte hemolysis in vitro. Our findings indicate thatAce-CRT plays an immunomodulatory role and may be a promising candidate moleculefor a hookworm vaccine.
Tingting Wei,Liang Wu,Feng Yu,Yin Lv,Long Chen,Yulin Shi,Bin Dai 한국탄소학회 2019 Carbon Letters Vol.29 No.5
The present work introduces a new method for the recycling of waste flocculation sludge to prepare electrode materials for supercapacitor. Hazardous azo dye was removal from textile dying wastewater by a new chitosan-based flocculant, and the generated dye sludge flocs was used as a nitrogen-containing precursor for the fabrication of N-doped carbon materials. The influence of azo dye on specific surface areas, nitrogen content, pore evolution of the resulting products and their electrochemical performance were investigated in detail. The results demonstrated a dual role of azo dye worked as both a nitrogen resource and pore-forming agent. The resulting N-doped carbon nanosheets derived from azo dye flocs demonstrated high electrochemical capacitance and good stability for supercapacitor electrode, which is attributed to the unique nitrogen doping, higher specific surface area and efficient charge transfer ability.
Tingting Xie,Hongtao Hu,Donghui Chen,Pengzhe Sun 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.7
(B4C/C)-β-PbO2 electrodes were prepared by high-pressure molding technique and characterized by X-ray diffraction, scanning electron microscopy, polarization curves, cyclic voltammetry curves, and corrosion resistance test. In this paper, the effects of initial concentration, current density, electrolyte concentration, pH, and electrode spacing on tetracycline hydrochloride (TCH) degradation were investigated. Results indicated that modified electrode had high electrochemical activities, high oxygen evolution potential, and excellent corrosion resistance. The maximum removal rate of TCH could reach 90.87% at initial concentration of 300 mg/L after 120 min electrolysis with Na2SO4 concentration of 0.2 mol/L, electrode spacing of 1 cm, current density of 30 mA/cm2, and pH 3. Pseudo-first-order kinetics equation was followed during electrocatalytic degradation of TCH with 20%(B4C/C)-β-PbO2 electrode.
The Novel Efficient Dual-field FIPS Modular Multiplication
( Tingting Zhang ),( Junru Zhu ),( Yang Liu ),( Fulong Chen ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.2
The modular multiplication is the key module of public-key cryptosystems such as RSA (Rivest-Shamir-Adleman) and ECC (Elliptic Curve Cryptography). However, the efficiency of the modular multiplication, especially the modular square, is very low. In order to reduce their operation cycles and power consumption, and improve the efficiency of the public-key cryptosystems, a dual-field efficient FIPS (Finely Integrated Product Scanning) modular multiplication algorithm is proposed. The algorithm makes a full use of the correlation of the data in the case of equal operands so as to avoid some redundant operations. The experimental results show that the operation speed of the modular square is increased by 23.8% compared to the traditional algorithm after the multiplication and addition operations are reduced about (s<sup>2</sup>-s)/2, and the read operations are reduced about s<sup>2</sup>-s, where s=n/32 for n-bit operands. In addition, since the algorithm supports the length scalable and dual-field modular multiplication, distinct applications focused on performance or cost could be satisfied by adjusting the relevant parameters.
Tingting Zhang,Po-Ju Chen 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07
This study focuses on the digital generation in China and their engagement in social media to co-create values with firms. The study employed a qualitative research approach to first develop a social media co-creation value scale. This was followed by motivational analysis of social media engagement to co-create values. A spectrum of utilitarian and hedonic motives related to value co-creation behaviors via social media were then identified. Many theoretical and practical implications are provided based on the study findings.