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박은정,김대선,박충희,송상환,이병훈,홍윤철,Xiaochuan Pan,Jingyu Wang,Yi-xiang Zhang,박광식 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.5
Concentrations of ambient air particles such as total suspended particulates (TSP), particulate matter (PM)10, and PM2.5, were monitored simultaneously from May to June, 2007, at four locations at Alashan and Beijing in China,and Seoul and Gosan in South Korea. These monitoring sites are in the pathway of Asian dust (AD) storms traveling from China to the Korean peninsula. An AD event was observed in the Korean peninsula on May 25-26. During the sampling period, the average concentrations of TSP and PM10 were each higher than 150 μg/m3 in Alashan and Beijing, but not in Seoul and Gosan. The concentration of TSP in Alashan (where the dust storm originated) on the day of the AD event reached 1824.7 μg/m3, this being the highest concentration of air particles observed during the sampling period. The level was decreased to 15% of this (274.7 μg/m3) in Seoul and to 8.7% (159. 0 μg/m3) in Gosan when the AD was observed two days later in Korea. Gosan, a representative background site in East Asia,displayed the lowest concentration of particles, with this maximal TSP concentration of 159 μg/m3. Inorganic element contents in the air particles were also measured, and the concentrations in the four different regions compared. Concentrations of anthropogenically-enriched heavy metals in PM10 and PM2.5, such as lead, arsenic,cadmium, and mercury, were higher in the metropolitan cities of Beijing and Seoul compared to non-industrialized regions of Alashan and Gosan. However, the concentrations of inorganic soil elements including iron, magnesium,aluminum sodium, and manganese, were higher in Alashan compared to those in other sampling sites.
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Fast Sol–Gel Method to Prepare Mesoporous TiO2 with High Photocatalytic Activity
Kui Zhang,Xiangdong Wang,Xiaoling Guo,Jie Dai,Jingyu Xiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
Mesoporous TiO2 nanoparticles were synthesized via a fast and classical sol–gel method, respectively. Polyacrylamide was used as the template in the fast sol–gel route; the polymerization crosslink by hydrogen bonds between the template and hydrolysates of Ti alkoxides shortens the reaction time from several days to several hours. The X-ray diffraction results testified that only anatase was obtained in the samples, and the crystallite sizes of the samples prepared by fast and classical sol–gel method were 13.6 nm and 20 nm, respectively. Transmission electron microscopy and N2 adsorption–desorption reveal that the nanocrystals have typical mesoporous structure and high surface areas. The pore sizes and surface areas of the samples prepared by fast and classical sol–gel method are 17.3 nm and 28.2 nm, 154.7 m2/g and 102.6 m2/g, respectively. The photocatalytic degradation of methyl orange solution under UV light irradiation suggests that the mesoporous TiO2 photocatalyst prepared by the fast sol–gel method exhibits higher photocatalytic activity than the mesoporous TiO2 prepared via classical sol–gel method.
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Hong-xia Jing,Jing Huang,Na Li,Long-xiang Li,Jingyue Zhang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.4
TiO2 is an important material for photocatalytic oxidation to degrade organic pollutants, but its utilization under visible light is low, recovery is difficult, and stability is poor. We prepared ZrO2-TiO2/CoFe2O4 (Zr-Ti/Co) photocatalyst with hollow core-shell structure by sol-gel method and layer-by-layer self-assembly method with tetrabutyl titanate and Zirconium n-butoxide as main raw materials. The samples were characterized and analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), solid ultraviolet visible diffuse reflection (UV-Vis DRS), fluorescence (FL), ultraviolet visible absorption (UV), vibrating sample magnetometer (VSM). It is concluded that the TiO2 maintains a good anatase phase structure in the Zr-Ti-Co photocatalyst. Under UV light and sunlight, the degradation rate of the photocatalyst reached 96.1% and 99.7% for 60 min, respectively, for Rhodamine B (10mg/L) reaction system. And after repeated use for five times, it still showed better regeneration and reuse.
KCI
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