一种新型季铵化壳聚糖-三聚氰胺-戊二醛树脂用于去除硝酸盐和磷酸盐阴离子。
A novel quaternized chitosan-melamine-glutaraldehyde resin for the removal of nitrate and phosphate anions.
机构信息
Department of Chemistry, The Gandhigram Rural Institute-Deemed University, Gandhigram, Dindigul 624 302, Tamil Nadu, India.
Department of Chemistry, The Gandhigram Rural Institute-Deemed University, Gandhigram, Dindigul 624 302, Tamil Nadu, India.
出版信息
Int J Biol Macromol. 2014 Mar;64:224-32. doi: 10.1016/j.ijbiomac.2013.11.036. Epub 2013 Dec 7.
A terpolymer of chitosan-melamine-glutaraldehyde was prepared for the first time and it was quaternized with glycidyl trimethyl ammonium chloride (GTMAC). The quaternized chitosan-melamine-glutaraldehyde resin (QCMGR) was found to be effective for the removal of nitrate and phosphate oxyanions. The resin was characterised with FTIR, SEM, EDAX, TGA, DTA, XRD and water regain property. Batch method was followed to optimise the conditions for the removal of nitrate and phosphate. Chemical kinetics of the adsorption was well fitted by pseudo-second order and particle diffusion models and the adsorption process followed the Freundlich isotherm model well. The nitrate and phosphate adsorption capacity of QCMGR from 1000 mg/L respective solutions were 97.5 and 112.5mg/g, respectively. Nitrate and phosphate anions adsorbed effectively on QCMGR by replacing Cl(-) ions at the quaternary ammonium group by exchange mechanism. Even after 10th regeneration cycle the adsorbent fully retained its adsorption efficiency. Nitrate and phosphate removal efficiency of QCMGR was also tested by column method.
壳聚糖-三聚氰胺-戊二醛三元共聚物首次被制备出来，并被氯化 3-二甲氨基丙基甲基丙烯酰胺（GTMAC）季铵化。实验发现，季铵化壳聚糖-三聚氰胺-戊二醛树脂（QCMGR）对于去除硝酸盐和磷酸盐含氧酸根是有效的。树脂通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、能谱分析（EDAX）、热重分析（TGA）、差热分析（DTA）、X 射线衍射（XRD）和回湿性能进行了表征。采用批处理法优化了去除硝酸盐和磷酸盐的条件。吸附的化学动力学很好地符合拟二级和颗粒扩散模型，吸附过程很好地符合弗伦德利希等温线模型。从 1000mg/L 的各自溶液中，QCMGR 的硝酸盐和磷酸盐吸附容量分别为 97.5 和 112.5mg/g。通过交换机制，QCMGR 上的季铵基团中的 Cl(-)离子被硝酸盐和磷酸盐阴离子有效取代，从而有效地吸附了这些阴离子。即使经过 10 次再生循环，吸附剂仍能完全保持其吸附效率。QCMGR 对硝酸盐和磷酸盐的去除效率也通过柱法进行了测试。
Zotero 插件