聚间苯二胺/碳纳米管复合材料制备及其电容法脱盐研究

摘要采用原位氧化聚合方法制备聚间苯二胺（PmPD）和碳纳米管（CNT）复合电极材料（PmPD@CNT），考察了PmPD的添加对复合材料亲水性、电化学性能的影响，研究了以PmPD@CNT为电极的电容法脱盐（Capacitive Deionization，CDI）性能。扫描电镜和透射电镜分析表明PmPD的球形形貌保留在复合材料中且均匀包裹在CNT外表面。接触角测试证明，与CNT （107°）相比，PmPD@CNT的接触角（61°）显著降低，亲水性明显提高。X射线衍射和拉曼光谱图的测试结果证明PmPD@CNT相比CNT有更多的缺陷点位，有利于提高离子吸附能力。电化学测试证明，PmPD@CNT （72.5 F·g^-1，0.071 Ω）比CNT （27.4 F·g^-1，0.089 Ω）具有更高的比电容和较低的电阻。将PmPD@CNT制备成固体电极用于CDI组件进行饱和脱盐测试，结果表明以500 mg·L^-1的NaCl溶液为原料液及1.4 V操作电压条件下，该复合电极的盐吸附量为16.64 mg，对应的比吸附量为35.40 mg·g^-1，平均吸附速率为10.11 mg·g^-1·min^-1，PmPD@CNT的比吸附量和平均吸附速率分别是CNT的2.4和1.4倍。PmPD@CNT因其良好的亲水性，优异的电化学性能和脱盐性能，有望成为有竞争力的CDI电极材料。

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	王世轩
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	王越

关键词：电容去离子碳纳米管复合材料导电聚合物聚间苯二胺

Abstract： In-situ oxidative polymerization was used to prepare poly-m-phenylenediamine (PmPD) and carbon nanotube (CNT) composite material (PmPD@CNT). The effects of PmPD on the hydrophilicity and electrochemical properties of CNT materials were investigated. Capacitive deionization (CDI) performance of PmPD@CNT was studied. Scanning electron microscopy and transmission electron microscopy showed that the spherical morphology of PmPD remained in the composite and was evenly wrapped on the outer surface of CNT. The contact angle test proved that compared with CNT (107°), the contact angle (61°) of PmPD@CNT is significantly reduced and the hydrophilicity is significantly improved. The test results of X-ray diffraction and Raman spectroscopy prove that PmPD@CNT has more defect sites than CNT, and the composite material has stronger adsorption capacity. Electrochemical tests proved that PmPD@CNT (72.5 F·g^-1, 0.071 Ω) has higher specific capacitance and lower resistance than CNT (27.4 F·g^-1, 0.089 Ω). PmPD@CNT was prepared as a solid electrode for CDI component desalination test. The results showed that with 500 mg·L^-1 NaCl solution as the raw material and 1.4 V operating voltage, the salt adsorption capacity of the composite electrode was 16.64 mg, and the specific adsorption capacity reaches 35.40 mg·g^-1 and the average adsorption rate is 10.11 mg·g^-1·min^-1. The specific adsorption capacity and average adsorption rate of PmPD@CNT are 2.4 and 1.4 times that of CNT, respectively. PmPD@CNT is expected to become a competitive CDI electrode material due to its good hydrophilicity, excellent electrochemical performance and desalination performance.

Keywords： capacitive deionization； carbon nanotube； composite material； conductive polymers； poly-m-phenylenediamine

Received 2021-03-01;

Fund:国家自然科学基金（21576190）。

Corresponding Authors: 王越,教授,E-mail:tdwy75@tju.edu.cn。 Email: tdwy75@tju.edu.cn

About author: 王世轩(1997-),男,硕士研究生,现从事电容法脱盐应用技术开发方面的研究。

引用本文:

王世轩, 蔡延萌, 徐世昌, 王越.聚间苯二胺/碳纳米管复合材料制备及其电容法脱盐研究[J]. 化学工业与工程, 2022,39(2): 90-99

WANG Shixuan, CAI Yanmeng, XU Shichang, WANG Yue.Preparation and performance test of poly-M-phenylene diamine and CNT composite material in capacitive deionization process[J]. Chemcial Industry and Engineering, 2022,39(2): 90-99

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