| PAAm/HACC半互穿网络水凝胶的制备及其对水中腐殖酸的吸附性能 |
| 摘要点击 2843 全文点击 958 投稿时间：2017-07-03 修订日期：2017-08-24 |
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| 中文关键词 聚丙烯酰胺 壳聚糖季铵盐 互穿网络水凝胶 吸附 腐殖酸 |
| 英文关键词 polyacrylamide chitosan quaternary ammonium salt interpenetrate network hydrogel adsorption humic acid |
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| 中文摘要 |
| 采用原位聚合热合成法成功制备了聚丙烯酰胺-壳聚糖季铵盐半互穿网络水凝胶（PAAm/HACC semi-IPN）新型吸附剂（s-IPN 1.5）和（s-IPN 3），并用于吸附水体中的腐殖酸.利用扫描电镜（SEM）、红外光谱（FT-IR）、X射线衍射光谱（XRD）等方法对吸附剂的结构进行表征.考察了溶液pH、离子强度、接触时间、腐殖酸初始浓度及温度等对吸附剂吸附腐殖酸的影响.结果表明s-IPN 3的吸附效果要优于s-IPN 1.5.吸附剂对腐殖酸的吸附量随着pH的增大而减小，随温度的升高而增大，且一定的离子强度有助于吸附剂对腐殖酸的吸附.吸附过程能较好地用准二级动力学模型及Sips等温模型进行拟合.吸附剂在pH 7.0，离子强度0.01 mol ·L-1，温度为298 K条件下的最大吸附量可高达238.08 mg ·g-1，吸附效果显著，能有效去除水体中的腐殖酸. |
| 英文摘要 |
| New absorbents, polyacrylamide/chitosan quaternary ammonium salt semi-interpenetrate network hydrogels[(PAAm/HACC semi-IPN), (s-IPN 1.5), and (s-IPN 3)], were successfully prepared via in situ polymerization by thermal synthesis for the removal of humic acid (HA) from aqueous solution. The materials were characterized by SEM, FT-IR, and XRD. The adsorption behaviors of adsorbents for HA were investigated as a function of pH, ionic strength, contact time, initial HA concentration, and temperature. The results showed that s-IPN 3 outperformed s-IPN 1.5. The adsorption capacity of the adsorbent for HA decreased with an increase in solution pH and decrease of temperature, and low ionic strength was conducive to the adsorption of HA. The adsorption kinetics fitted to a pseudo-second-order kinetic model and the adsorption isotherms could be described by the Sips isotherm model. The impressive maximum adsorption capacity could reach 238.08 mg·g-1 at the condition of pH=7.0, ionic strength=0.01 mol·L-1, and T=298 K. The adsorbent could remove HA from aqueous solution efficiently. |
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