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Chemistry and Industry of Forest Products ›› 2023, Vol. 43 ›› Issue (1): 72-78.doi: 10.3969/j.issn.0253-2417.2023.01.009

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The Application of Capacitive Deionization Technology Based on Activated Carbon Electrode to Produce Pure Water

Chang TAN1, Bei LI2,3, Ao WANG1, Xiaojing LIU2, Dongrui YAO2, Kang SUN1,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; Key Lab. of Biomass Energy and Material, Jiangsu Province; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, China
    2. Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
    3. Nanjing Forestry University, Nanjing 210037, China
  • Received:2021-12-21 Online:2023-02-28 Published:2023-02-28
  • Contact: Kang SUN E-mail:sunkang0226@163.com


Capacitive deionization(CDI) was emerging as a technology with low-energy consumption in treating brackish water. The feasibility of CDI technology based on carbon electrodes in producing pure water was investigated in this work. A self-designed CDI desalination system was constructed with activated carbon electrodes, graphite current collector, plexiglass spacer, etc. The desalination capacity, energy consumption, salt removal rate, ion interception rate, water recovery and stability of the CDI system were explored by using urban tap water as the feed. The results showed that the specific surface area of Activated carbon was 1 586 m2/g, average pore diameter was 2.08 nm, and total pore volume was 0.82 cm3/g. XPS showed that the carbon, oxygen and nitrogen contents of the activated carbon were 94.81%, 4.10% and 1.09%, respectively, which contained a small amounts of oxygen- and nitrogen functional groups on the surface. The CDI system could produce pure water with ion concentration of 0.06 mmol/L and total dissolved solids(TDS) lower than 5 mg/L, while the energy consumption was only 0.115 5 kWh/m3 and the overall salt removal rate reached 98.1%. The ion rejection rates of various ions were ranging from 78.6% to 99.8%, and the water recovery was 80%. Furthermore, the desalination performance of the electrode remained stable and the cycle performance was good after 42 adsorption-desorption cycles.

Key words: capacitive deionization, activated carbon, electrical adsorption, pure water production

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