化工学报 ›› 2021, Vol. 72 ›› Issue (3): 1732-1741.DOI: 10.11949/0438-1157.20200821
刘元伟1,2(),董晨初1,2,廖俊斌1,王超1,陈权1,沈江南1()
收稿日期:
2020-06-24
修回日期:
2020-09-01
出版日期:
2021-03-05
发布日期:
2021-03-05
通讯作者:
沈江南
作者简介:
刘元伟(1979—),女,博士研究生,基金资助:
LIU Yuanwei1,2(),DONG Chenchu1,2,LIAO Junbin1,WANG Chao1,CHEN Quan1,SHEN Jiangnan1()
Received:
2020-06-24
Revised:
2020-09-01
Online:
2021-03-05
Published:
2021-03-05
Contact:
SHEN Jiangnan
摘要:
采用含有不同碳链长度的4-乙基吡啶、3-丁基吡啶与3-己基吡啶,通过亲核取代反应分别对溴化聚苯醚(BPPO)进行季铵化,制得三种阴离子交换膜(QBPPO-1、QBPPO-2、QBPPO-3)并对其电化学性能、脱盐性能以及抗污染性能进行了研究。实验结果表明随着吡啶环上烷基碳链的增长,制得的离子交换膜的离子交换容量呈现下降趋势,由1.92 mmol/g降至1.34 mmol/g,而膜面电阻逐渐增加,由2.99 Ω·cm2增加到10.59 Ω·cm2;在电渗析实验中,与商业日本Fuji阴离子交换膜相比,本实验制备的三种离子交换膜均呈现出较高的脱盐率;在污染实验中,随着高分子骨架侧链碳链的增长,离子交换膜在污染实验中的的转折时间逐渐变短,抗污染能力下降;计算模拟结果表明疏水作用在有机污染物(十二烷基苯磺酸钠)与离子交换膜内高分子骨架侧链的亲和相互作用中占有重要地位。
中图分类号:
刘元伟, 董晨初, 廖俊斌, 王超, 陈权, 沈江南. 不同侧链BPPO阴离子交换膜的制备及其抗污染性能[J]. 化工学报, 2021, 72(3): 1732-1741.
LIU Yuanwei, DONG Chenchu, LIAO Junbin, WANG Chao, CHEN Quan, SHEN Jiangnan. Anti-fouling properties and preparation of anion-exchange membranes based on BPPO modified by different side chain lengths[J]. CIESC Journal, 2021, 72(3): 1732-1741.
膜 | 脱盐率/% | 电流效率/% | 能耗/(kW·h/kg) |
---|---|---|---|
QBPPO-1 | 61.60 | 49.08 | 2.20 |
QBPPO-2 | 60.16 | 47.48 | 2.26 |
QBPPO-3 | 55.53 | 47.26 | 2.28 |
Fuji film | 59.28 | 41.79 | 2.38 |
表1 电渗析脱盐率、电流密度与能耗测试结果
Table 1 Removal rate, current efficiency and energy consumption in ED test after 3 h
膜 | 脱盐率/% | 电流效率/% | 能耗/(kW·h/kg) |
---|---|---|---|
QBPPO-1 | 61.60 | 49.08 | 2.20 |
QBPPO-2 | 60.16 | 47.48 | 2.26 |
QBPPO-3 | 55.53 | 47.26 | 2.28 |
Fuji film | 59.28 | 41.79 | 2.38 |
膜 | 转折时间/min |
---|---|
Fuji film | 100.5 |
QBPPO-1 | 702.4 |
QBPPO-2 | 30.7 |
QBPPO-3 | 20.1 |
表2 不同离子交换膜污染实验转折时间测试结果
Table 2 Transtion time of different membranes in fouling test
膜 | 转折时间/min |
---|---|
Fuji film | 100.5 |
QBPPO-1 | 702.4 |
QBPPO-2 | 30.7 |
QBPPO-3 | 20.1 |
Complex | ADCH (side chain) | ADCH(SDBS) | ||||
---|---|---|---|---|---|---|
Pyridine group | Methyl group | Alkyl chain | Sulfonic group | Phenyl group | Alkyl chain | |
QBPPO-1 | 0.662 | 0.122 | 0.216 | -0.921 | -0.161 | 0.082 |
QBPPO-2 | 0.637 | 0.242 | 0.121 | -0.912 | -0.164 | 0.076 |
QBPPO-3 | 0.617 | 0.273 | 0.120 | -0.911 | -0.173 | 0.083 |
表3 不同侧链与SDBS形成的复合物的ADCH原子电荷
Table 3 ADCH atomic charges of complexes formed by different side chains and SDBS
Complex | ADCH (side chain) | ADCH(SDBS) | ||||
---|---|---|---|---|---|---|
Pyridine group | Methyl group | Alkyl chain | Sulfonic group | Phenyl group | Alkyl chain | |
QBPPO-1 | 0.662 | 0.122 | 0.216 | -0.921 | -0.161 | 0.082 |
QBPPO-2 | 0.637 | 0.242 | 0.121 | -0.912 | -0.164 | 0.076 |
QBPPO-3 | 0.617 | 0.273 | 0.120 | -0.911 | -0.173 | 0.083 |
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