摘要
合成了一种含有季铵盐结构的希夫碱型螯合树脂（CPS-DMA-S-HCTA）,研究了其对Pb（II）离子的吸附和脱附行为.树脂红外光谱分析和元素分析结果表明,成功合成了CPS-DMA-S-HCTA螯合树脂;树脂的热分析结果表明,CPS-DMA-S-HCTA树脂的初始分解温度为205℃,具有良好的热稳定性;静态实验结果表明,在研究的浓度范围内,吸附平衡数据符合Freundlich等温吸附方程,且吸附为放热、混乱度减小的自发过程,吸附过程以化学吸附为主,298 K,Pb（Ⅱ）溶液的初始浓度为600 mg/L时,适宜的吸附pH为5~6,平衡吸附量为96.1 mg/g,吸附达到平衡的时间约为10 min.采用1.5 mol/L的硝酸溶液作脱附剂,脱附率可达98%以上,解吸速率快,10 min左右流出液中重金属离子的浓度几乎为0 mg/L.经过10次吸附-解吸-吸附研究表明,树脂可重复使用性强.
A novel chelating resin containing quaternary ammonium salt（CPS-DMA-S-HCTA） was synthesized to recycle heavy metals from waste water,and the behavior of adsorption and desorption of Pb（II） was discussed.The infared spectra and elemental analysis of the chelating resin showed that CPS-DMA-SHCTA synthesized successfully.TGA result showed that the initial temperature of decomposition was 205 ℃ and CPS-DMA-S-HCTA was good in thermal stability.The static test showed that the equilibrium adsorption data fitted to Freundlich isotherms.The adsorption is an exothermic process which decreases the confusion and occures spontaneously.The chemical and physical adsorption processes（mainly chemical process） in metal ions adsorption occur concurrently.The best adsorption conditions at 298 K were obtained： the initial concentration of Pb（Ⅱ） was 600 mg / L,pH = 5 ~ 6,the equilibrium adsorption uptake time was 15 min and the adsorption capacity of Pb（Ⅱ） was 96.1 mg / g.The resin was stable in structural and performance after 10 times of adsorption-desorption-adsorption test,which indicated that the resin can be used repeatedly while more than 98% regeneration efficiency for CPS-DMA-S-HCTA was achieved by using 1.5 mol / L HNO 3.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2013年第9期1219-1225,共7页
Acta Polymerica Sinica
基金
江苏省自然科学基金(基金号BK2011399)资助项目
关键词
季铵盐
希夫碱型螯合树脂
5-氯甲基水杨醛
Pb（Ⅱ）
吸附
脱附
Quaternary ammonium salts
Schiff base chelating resin
5-Cholromethylsalicylaldehyde
Pb（Ⅱ）
Adsorption
Desorption
