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RISS 인기검색어
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- 저자 : Fangqin Li (검색결과 5 건)
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Formation of MgCO3 3H2O in the CO2 mineralization system using Mg (OH)2 as an intermediate at 20 C
Wenting Cheng,Li Fang,Huaigang Cheng,Enze Li,Cuiyu Zhang,Fangqin Cheng 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
The formation of MgCO3 3H2O in the CO2 mineralization system was investigated using Mg(OH)2 as anintermediate at 20 C. Liquid and solid analyses were done for qualitative and quantitative compositioncharacterizations of the reacted samples. Results showed that the morphology of Mg(OH)2 had anobvious effect on the growth rate, size and morphology of MgCO3 3H2O. The formation of MgCO3 3H2Omight be explained by the dissolution–recrystallization mechanism. Larger bundle-like MgCO3 3H2Owhich composed of middle-binding rod crystals was obtained from the plate-like Mg(OH)2. Thesefindings could pave the way for controllable crystallization of MgCO3 3H2O in a CO2 mineralizationsystem.
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Recovery of Bisphenol A by pH-Triggered Magnetic Nanoparticles
Yongsheng Jia,Enze Li,Zhiping Du,Jianfeng Li,Fangqin Cheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5
Bisphenol A is not only one of the frequent contaminants of industrial wastewater, but also one of the main ingredients in polycarbonate and epoxy resins. This study synthesizes a pH-triggered Fe3O4@mSiO2@DPDES adsorbent for recycling Bisphenol A through adsorption–desorption process. Due to the strong π–π interaction between the phenyl groups in diphenyldiethoxysilane modified magnetic nanoparticles (MNPs) and Bisphenol A, absorbance reached 120.17 mg/g at pH 7, allowing the bisphenol A adsorbed to Fe3O4@mSiO2@DPDES to be trivially separated from aqueous solutions with a magnet. Desorption of the adsorbed bisphenol A in aqueous solution occurred at pH 2, allowing an impressive 95% recovery rate. The durability of the Fe3O4@mSiO2@DPDES adsorbent was tested by repeated separation of bisphenol A from an aqueous solution, with the recovery efficiency remaining greater than 85% after five cycles.
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Weiqun Chu,Hailong Liu,Qilin Zhang,Fangqin Li,Cheng Peng,Zhihai Cheng,Jiang Wu,Sorachon Yoriya,Ping He,Hai Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
Regulation of carrier capture and transport is critical for the enhancement of photocatalytic activity. Inthis work, a Bi5O7I photocatalyst containing double vacant tazetta-like structure was synthesized byone-pot calcination. X-ray photoelectron spectroscopy (XPS) and electron spin resonance spectroscopy(ESR) analysis showed that the vacancy structure improved the activation performance of adsorbed oxygen,thereby promoting the participation of superoxide radicals in the photocatalytic reaction. The resultsof electron paramagnetic resonance (EPR), electrochemical impedance spectroscopy (EIS) and timeresolvedphotoluminescence spectroscopy (TRPL) revealed that the defect state induced by double vacanciescould adjust the electron transport pathway, and the fluorescence lifetime could reach 3.043 ns,which greatly improved the photocatalytic reactivity. We further tested the photocatalytic activity ofheavy metal mercury removal experiment, and the optimal photocatalytic mercury removal efficiencyincreased to 83%. Finally, combining the results of DFT calculation and photocatalytic mercury removalexperiments, we proposed the photocatalytic reaction mechanism of Bi5O7I regulated by double vacancies. Our work provides a more convenient method for the design of defect engineering photocatalystsand provides effective theoretical support for photocatalytic removal of heavy metal mercury in flue gas.
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NOx removal by non-thermal plasma at low temperatures with amino groups additives
Zhenzhen Guan,Jian-Xing Ren,Dezhen Chen,Liu Hong,Fangqin Li,Du Wang,Yuanhuang Ouyang,Yang Gao 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
NOx removal from flue gas using direct current (DC) narrow pulsed discharge-induced non-thermal plasma (NTP) was experimentally investigated. Factors such as additives, NOx initial concentrations, residence time, reaction temperatures inside the NTP reactor, and so on were investigated to evaluate their effects on NOx removal efficiencies. The focus was on the effects of additives containing amino groups. The results showed that H2O addition enhanced NOx removal, NH3 could further increase the NOx removal efficiencies under the same conditions without an obvious NH3 slip, and N2H4 was the most effective additive by reducing NOx to N2. X-Ray diffraction (XRD) analysis of the products collected from the NTP reactor demonstrated that NOx removal inside the NTP reactor was mainly based on NOx oxidation when ammonia or H2O was used as an additive, while NOx removal was mainly based on NOx reduction with the N2H4 additive.
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Yu Guan,Tao Hu,Jiang Wu,Lili Zhao,Fengguo Tian,Wei-Guo Pan,Ping He,Xuemei Qi,Fangqin Li,Kai Xu 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1
We used a simple method of graphene oxide (GO) preparation with different oxidation levels, and control the properties of the TiO2 nanocrystals by tuning the content and oxidation degree of GO to enhance the photocatalytic performance. During the hydrothermal reaction, reduction of GO, formation of TiO2 and chemical bonds between TiO2 and reduced graphene oxide (RGO) was achieved simultaneously. Characterization results showed that TiO2 properties such as crystalline grain and particle size could be tailored by the amount of functional groups, and that crystallinity was also controlled by GO degrees of oxidation. TiO2/RGO photocatalysts showed great efficiency of mercury oxidation, which reached 83.7% and 43.6% under UV and LED light irradiation, respectively. The effects of crystalline grain size and surface chemical properties on Hg0 removal under LED and UV light irradiation were analyzed. In addition, the properties of the photocatalysts before and after UV illumination were investigated, finding that part of Ti-OH on TiO2 surface transformed to Ti-O-Ti. In a nutshell, this work could provide a new insight into enhancing activity of photocatalysts and understanding the photocatalytic mechanism.
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