ZIF-8/碳纸(CP)整体式复合电极的制备及脱盐性能研究
Research on Preparation and Desalination Performance of ZIF-8/Carbon Paper (CP) Monolithic Composite Electrode
摘要: 电容去离子(CDI)因其低能耗、低成本和低污染等优点被认为是一种新型的海水淡化技术，电极材料在CDI脱盐性能中起着重要作用。具有高比表面积表面积、亲水表面和优异电化学性能的多孔材料已被证明是理想的电极材料。而金属有机骨架(MOF)碳由于其可控的形态和微观结构、合适的孔径分布和优异的导电性而称为多孔碳材料的首选。本文以酸处理后的碳纸为基底材料，在甲醇溶剂条件下，利用水热法得到ZIF-8/CP复合材料。研究了水热条件对材料形貌、表面润湿性和电化学性能的影响。结果表明，ZIF-8/CP表面接触角为14˚，表现出亲水特性。在三电极体系下，ZIF-8/CP-CH3OH拥有更好的电化学性能，ZIF-8/CP-CH3OH复合材料比电容达到了纯CP的4.3倍；在1.2 V电压、9 mL/min流速、500 mg∙g−1初始NaCl溶液浓度下，脱盐量可达25.72 mg∙g−1，且脱盐率达到了16.65%。CDI装置循环多次后仍具有良好的循环再生性能，且循环6次后再生率达到了97%。
Abstract: Capacitive deionization (CDI) is considered to be a new type of seawater desalination technology due to its low energy consumption, low cost and low pollution. Electrode materials play an important role in the desalination performance of CDI. Porous materials with high specific surface area, hydrophilic surface and excellent electrochemical properties have been proven to be ideal electrode materials. Metal organic framework (MOF) carbon is the first choice for porous carbon materials due to its controllable morphology and microstructure, suitable pore size distribution and excellent electrical conductivity. In this paper, the acid-treated carbon paper is used as the base material, and the ZIF-8/CP composite material is obtained by hydrothermal method under the condition of methanol solvent. The influence of hydrothermal conditions on the morphology, surface wettability and electrochemical performance of the material was studied. The results show that the surface contact angle of ZIF-8/CP is 14˚, showing hydrophilic properties. Under the three-electrode system, ZIF-8/CP-CH3OH has better electrochemical performance, and the specific capacitance of ZIF-8/CP-CH3OH composite material reaches 4.3 times that of pure CP; at 1.2 V voltage, 9 mL/min with a flow rate and an initial NaCl concentration of 500 mg∙g−1, the desalination amount can reach 25.72 mg∙g−1, and the desalination rate can reach 16.65%. The CDI device still has good recycling performance after repeated cycles, and the regeneration rate reaches 97% after 6 cycles.
文章引用：金冠宇. ZIF-8/碳纸(CP)整体式复合电极的制备及脱盐性能研究[J]. 材料科学, 2022, 12(1): 25-39. https://doi.org/10.12677/MS.2022.121003

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