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- 저자 : Zhengwei Luo (검색결과 2 건)
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Zhengwei Luo,Lei Li,Mulin Guo,Hui Jiang,Wenhua Geng,Wuji Wei,Zhouyang Lian 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
In this work, a new strategy was developed to prepare Cr(VI)-imprinted polypropylene (PP) fibers-based materialsfor the adsorption of Cr(VI) from water. Granular PP was modified with dual monomers (glycidyl methacrylate (GMA) andacrylamide (AM)) by water-solid suspension grafting copolymerization. Then, this fibers morphology was obtained by meltblowing. Hence, the preparation steps of the fibrous Cr(VI)-imprinted adsorbent involved surface ion-imprinting andcrosslinking. The influence of the grafting conditions on the grafting percentage was investigated. The maxima graftingpercentages of GMA and AM were 16.4 and 10.6 %, respectively. The chemically modified products showed good mobilityand stability, thus meeting the requirements of melt-blowing method. The prepared Cr(VI)-imprinted polymers showed amaximum adsorption capacity to Cr(VI) of 43.2 mg/g at pH 3. The adsorption data were well fitted by the pseudo-secondorderand Langmuir adsorption models. The adsorbent showed good selectively toward Cr(VI) in a mixed solution containingCu(II) and SO42−. The X-ray photoelectron spectroscopy demonstrated that the adsorbed Cr(VI) was partly reduced to Cr(III).
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Haonan Chen,Mulin Guo,Xiaohong Yao,Zhengwei Luo,Kai Dong,Zhouyang Lian,Wuji Wei 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4
A new chelating adsorbent for the removal of Cd(II) from aqueous solution, PP-g-GMA-DETA fibers, is prepared by plasma induced grafting of glycidyl methacrylate (GMA) onto the surface of polypropylene (PP) fibers, followed by modification with diethylenetriamine (DETA). The effects of grafting parameters on the grafting degree are investigated. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy prove the successful grafting of GMA onto the surfaces of PP fibers and the subsequent conversion of epoxy groups of grafted GMA to amine groups, on reaction with DETA. The adsorption performances of Cd(II) by the chelating fibers are evaluated in detail. Kinetic and isothermal parameters are also evaluated. The data fit well with the pseudo-second order and Langmuir isotherm model, respectively. The maximum adsorption capacity of Cd(II) is 46.47 mg g-1 and the prepared fibers show selective adsorbability towards target Cd(II) in presence of competing Mg(II) ions.
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