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- 저자 : Xuemin Xiao (검색결과 2 건)
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Xuemin Xiao,Fei Tian,Yujun Yan,Zhilin Wu,Zhansheng Wu,Giancarlo Cravotto 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.6
Coal-based activated carbon (CAC) was prepared from coal produced in Xinjiang of China by microwave activation. CAC was characterized and used as an adsorbent for phenanthrene adsorption. The effects of temperature, adsorption time, CAC amount, initial concentration and pH value of solution on phenanthrene adsorption were studied. The adsorption rate of phenanthrene onto CAC was obtained nearly 100% with initial concentration of 100 mg/L and CAC dosage of 0.3 g at 25 oC. Phenanthrene adsorption was well described with the Langmuir isotherm. The pseudosecond- order model was found to more effectively explain the adsorption kinetics of phenanthrene. The lower temperature was favorable to the adsorption rate and equilibrium adsorption capacity of phenanthrene onto CAC. The thermodynamic parameters ΔHθ, ΔSθ and ΔGθ computed for phenanthrene adsorption onto CAC demonstrate the process was spontaneous, radiative, and entropically driven. Thus, CAC prepared by microwave activation could be effective for removing phenanthrene.
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Fang, Luwei,Tian, Minglei,Yan, Xuemin,Xiao, Wei,Row, Kyung Ho Elsevier 2019 Journal of chromatography Vol.1592 No.-
<P><B>Abstract</B></P> <P>A convenient, and efficient multi-phase extraction method was used to isolate aristolochic acid from real samples. To increase the efficiency, a new dual ionic liquid-immobilized silica was used as a sorbent and the effects of the adsorption conditions were investigated. IM-BIM@Sil in a methanol/water (60:40, v/v) solution at 60 °C extracted the highest amount of aristolochic acid (16.69 mg/g) compared to the other sorbents examined. The sorbent was then applied to the multi-phase extraction of aristolochic acid. After extraction eight times, 2.4–70.9 × 10<SUP>−3</SUP> mg/g of aristolochic acid was isolated from nine real samples after several washing and elution steps. The recoveries of aristolochic acid ranged from 70.0% to 110.6% with relative standard deviations of 3.5%–9.1%, highlighting the accuracy of this method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dual ionic liquid-immobilized silicas were created. </LI> <LI> High efficiency multi-phase extraction was applied in isolation. </LI> <LI> High adsorption amount of aristolochic acid on new sorbent. </LI> </UL> </P>
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