【摘要】 通过悬浮共聚-表面氨基化反应制得三乙胺修饰的聚苯乙烯微球(TPM),考察了TPM去除水中硝酸盐的性能。试验结果表明,相较于颗粒活性炭(GAC)、大孔吸附树脂(XAD-4)和离子交换树脂(D201),TPM去除硝酸盐的效果较好。pH值对TPM吸附硝酸盐的效果有影响,当pH值为6～7时具有最大的硝酸盐吸附量(45. 23 mg/g)。在有竞争离子存在的条件下,TPM对硝酸盐表现出良好的吸附选择性,这得益于其表面修饰的三乙胺基团上长烷基链的疏水作用。吸附饱和的TPM能够通过NaOH-NaCl混合溶液进行原位再生,再生后的TPM对硝酸盐的吸附性能保持稳定,从而可实现多批次循环吸附。更多还原

【Abstract】 Triethylamine functionalized polystyrene microspheres( TPM) were prepared by suspension copolymerization and surface amination reaction,and selective removal of nitrate from water by TPM was investigated. Compared with granular activated carbon( GAC),macroporous polystyrene resin( XAD-4) and ion exchange resin( D201), it was found that TPM had better nitrate removal performance. The pH value had an influence on the effect of nitrate adsorption by TPM. When the pH value was 6-7,the maximum nitrate adsorption capacity of 45. 23 mg/g was obtained. Benefited from the hydrophobic effect provided by functionalized triethylamine of longer alkyl group,TPM demonstrated good adsorption selectivity to nitrate in the presence of competing ions. More attractively,the exhausted TPM could be regenerated in situ by NaOH-NaCl binary solution. After regeneration,adsorption property of nitrate by TPM remained stable,so that multiple batches of cyclic adsorption could be achieved.更多还原