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金虫 (初入文坛)

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Abstract−A chelating resin is produced by coupling a dye calcein blue to Amberlite XAD-2 through an azo spacer.
The resulting resin has been characterized by FT-IR, elemental analysis, thermogravimetric analysis (TGA) and scanning
electron microscopy (SEM) studied for the preconcentration and determination of trace Cu(II) from solution samples.
The optimum pH for adsorption of copper ions was 6. The sorption capacity of functionalized resin is 27 mg·g−1. The
chelating resin can be reused for 10 cycles without any significant changes in sorption capacity. A recovery of 100%
was obtained for Cu(II) when eluted with 0.5M nitric acid. Scatchard analysis revealed that homogeneous binding
sites were formed in the resin. The equilibrium adsorption data of Cu(II) on modified resin were analyzed by Langmuir,
Freundlich and Temkin models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants
were determined 0.036, 2.196 and 0.348 at pH 6 and 20 oC, respectively. The method was applied for Cu(II) assay in
environmental samples.
Key words: Copper, Preconcentration, Solid Phase Extraction, Determination, Amberlite XAD-2, Isotherm Study
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至尊木虫 (职业作家)

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sltmac: 金币+1 2012-04-20 09:35:30
转弯为你相遇: 金币+20, 翻译EPI+1, ★★★很有帮助 2012-04-20 23:25:46
摘要:螯合树脂通过偶氮垫片的腙2 耦合染料钙蓝生产。我们用红外光谱、 元素、 热重分析 (TGA)以及通过扫描电子显微镜 (SEM)富集和测定Cu(II)痕量表明树脂是由此产生的。吸附铜离子的最佳的 ph 值是 6。功能化树脂吸附能力是 27 mg•g−1。螯合树脂如果没有重大改变,那么它的吸附作用为可以维持10 个周期。当我们用Cu(II) 来洗脱 0.5 mol/L的硝酸时,树脂可以获得 100%的恢复。斯卡查德分析显示均相结合位点在树脂中形成。改性树脂上的 Cu(II) 的平衡吸附数据可通过朗缪尔、 弗罗因德利克和特姆金模型分析。基于平衡吸附数据,当ph 值为6 和 温度为20oC时,朗缪尔、弗罗因德利克和特姆金常数分别为0.036、 2.196 和 0.348。这种Cu(II)的方法可应用于测定环境样品。

关键词: 铜,预富集,富集,固相萃,测定,腙 2,等温线研究
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2楼2012-04-20 07:59:59
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