High-Recovery Material for Mercury Ions Based on a Polyallylamine Hydrogel with Thiourea Groups at Cross-Linking Points

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• 作者：Daisuke Nagai ; Takehiro Daimon ; Satoshi Kawakami ; Kenji Inoue
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：February 26, 2014
• 年：2014
• 卷：53
• 期：8
• 页码：3300-3304
• 全文大小：231K
• 年卷期：v.53,no.8(February 26, 2014)
• ISSN：1520-5045

文摘

We have successfully synthesized a high-recovery material for mercury based on a polyallylamine (PAA) hydrogel bearing thiourea cross-linking points and pendant amino groups. Adsorption of Hg^II was not significantly influenced by pH, and the PAA hydrogel was also able to adsorb Hg^II at a wide pH range (1鈥?) with high adsorption efficiency (鈮?3%). Adsorption was fast in the first 10 min, with 84% adsorption efficiency, and equilibrium was reached within 30 min. Langmuir and Freundlich isotherm models were employed to correlate the experimental data. The adsorption of Hg^II by PAA hydrogel is well supported by a Langmuir isotherm model with a maximum adsorption capacity of 2.375 g_Hg/g_gel, which is greater than those of other polymers in the literature. The PAA hydrogel was also to adsorb efficiently in a low concentration Hg^II aqueous solution (0.2 ppm). This polymer will be applicable as a high recovery material for mercury.