Preparation and performance test of poly-M-phenylene diamine and CNT composite material in capacitive deionization process

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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.

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	WANG Shixuan
	CAI Yanmeng
	XU Shichang
	WANG Yue

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

Received 2021-03-01;

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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,V39(2): 90-99

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