Yiqun Xiong

Hunan University, Ch’ang-sha-shih, Hunan, China

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Publications (2)8.78 Total impact

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    ABSTRACT: This research investigated the adsorption of zinc and lead from binary metal solution with tunable selectivity. A nano adsorbent was prepared by introducing imine groups onto the surface of stability enhanced magnetic nanoparticles and then characterized by TEM and FTIR. Binary metal components adsorption was carried out in different concentration of metal and EDTA solution. Due to the interaction between metals and adsorbent in the presence of EDTA, the selective adsorption of zinc and lead could be achieved with 100% selectivity. To only remove zinc from binary metals, the solution condition was [EDTA]/[M(2+)] = 0.7 with pH of 6, and its saturated adsorption capacity was 1.25 mmol/g. For selective adsorption of lead, an equilibrium adsorption capacity of 0.81 mmol/g was obtained under the condition of [EDTA]/[M(2+)] = 0.7 and pH of 2. The exhausted adsorbent could be regenerated by simple acid or alkali wash, and high purity lead and zinc salt solutions were recovered and concentrated.
    Langmuir 11/2011; 28(1):468-73. DOI:10.1021/la203810c · 4.46 Impact Factor
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    ABSTRACT: a b s t r a c t A stable magnetic nanoparticle with a shell core structure of -Fe 2 O 3 @Fe 3 O 4 was developed. Water soluble Polyethylenimine (PEI) was grafted to the nanoparticle to prepare a positive charged adsorbent, which was characterized by XRD, FTIR and SEM. The adsorbent was able to effectively remove anionic Cr(VI) in the pH range of 2–3 due to the large amount of protonated imine groups on its surface, and could be magnetically separated from liquid quickly. Adsorption equilibrium was reached within 30 min and independent of initial Cr(VI) concentration. The Cr(VI) maximum sorption capacity at a temperature range of 35–15 • C was obtained using the Langmuir adsorption isotherm. The calculated thermodynamic parameters (G, H, and S) indicated that adsorption of Cr(VI) was spontaneous and exothermic in nature. Competition from coexisting ions (K + , Na + , Ca 2+ , Cu 2+ , Cl − , and NO 3 −) was found insignificant. The adsorbent had satisfying acid–alkali stability and could be regenerated by 0.02 mol L −1 NaOH solution. The results suggested the potential application of the PEI-modified magnetic nanoparticles in selective removal of Cr(VI) from wastewater.
    Chemical Engineering Journal 11/2011; 175(1):222-227. DOI:10.1016/j.cej.2011.09.098 · 4.32 Impact Factor