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首页> 外文期刊>Journal of Applied Polymer Science >CONGO RED ATTACHED POLY(EGDMA-HEMA) MICROSPHERES AS SPECIFIC SORBENTS FOR REMOVAL OF CADMIUM IONS
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CONGO RED ATTACHED POLY(EGDMA-HEMA) MICROSPHERES AS SPECIFIC SORBENTS FOR REMOVAL OF CADMIUM IONS

机译：刚果红附着的聚（EGDMA-HEMA）微球作为脱除镉离子的特殊吸附剂

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Poly[ethyleneglycoldimethacrylate (EGDMA)-hydroxyethylmethacrylate (HEMA)] microspheres (150-200 mu m in diameter) were produced by suspension copolymerization of EGDMA and HEMA in an aqueous medium. Toluene was included in the formulations in order to produce water-swellable microspheres. Poly(vinyl alcohol) and benzoyl peroxide were used as stabilizer and initiator, respectively. Congo red was chemically attached to the microspheres as a metal chelating ligand for specific adsorption of heavy metal ions. These sorbents were characterized by an optical microscopy and a FTIR. Adsorption/desorption of cadmium (Cd2+) ions from aqueous solutions on these sorbents were investigated in batch equilibrium experiments by using an atomic absorption spectroscopy with a graphite furnace atomizer. The maximum cadmium adsorption on to the dye-attached microspheres (i.e., by complex formation) was about 18.3 mg Cd2+ ions/g polymer, which was observed at pH 6.8. While adsorption onto the plain poly(EGDMA-HEMA) microspheres (i.e., nonspecific adsorption) was about 0.93 mg Cd2+ ions/g polymer at the same conditions. More than 90% of the adsorbed cadmium was desorbed in 1 h by using 2M NaCl as an eluant. The resorption capacity of the sorbent did not significantly decrease during repeated sorption-desorption cycling. (C) 1996 John Wiley & Sons, Inc. [References: 21]
机译：通过在水介质中悬浮共聚EGDMA和HEMA，制备了直径为150-200μm的聚[甲基丙烯酸乙二醇二甲酯（EGDMA）-甲基丙烯酸羟乙酯（HEMA）]微球。为了产生水溶胀性微球，在制剂中包括甲苯。聚乙烯醇和过氧化苯甲酰分别用作稳定剂和引发剂。刚果红作为金属螯合配体化学附着到微球上，用于重金属离子的特异性吸附。这些吸附剂通过光学显微镜和FTIR表征。通过使用带有石墨炉雾化器的原子吸收光谱，在间歇式平衡实验中研究了这些吸附剂上水溶液中镉（Cd2 +）离子的吸附/解吸。在附有染料的微球上的最大镉吸附量（即通过形成络合物）为约18.3 mg Cd2 +离子/ g聚合物，在pH 6.8时观察到。在相同条件下吸附到普通的聚（EGDMA-HEMA）微球上（即非特异性吸附）约为0.93 mg Cd2 +离子/ g聚合物。通过使用2M NaCl作为洗脱液，在1小时内解吸了90％以上的镉。在重复的吸附-解吸循环过程中，吸附剂的吸收能力没有明显降低。 （C）1996 John Wiley＆Sons，Inc. [参考：21]

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