A pulsed power supply was used in capacitive deionization instead of DC power supply. A pulsed capacitive deionization cell was constructed. The removal rates of NO3--N and NH3-N by pulsed-CDI and DC-CDI were compared, and within 60 minutes, a higher removal efficiency by pulsed-CDI. The removal rate of NO3-N was the highest under 50% duty cycle and 104Hz frequency. Results from molecular dynamics simulation showed that the orientation of hydrogen and oxygen atoms in water molecules was more random under pulsed electric field. Compared with DC electric field, the orientation polarization of water molecules' dipole moment was weakened and the mass transfer resistance of ions is reduced.
金肇岩, 胡筱敏, 孙通, 赵研. 脉冲电吸附技术深度脱氮及分子动力学模拟[J]. 中国环境科学, 2019, 39(7): 2871-2879.
JIN Zhao-yan, HU Xiao-min, SUN Tong, ZHAO Yan. Capacitive deionization using a pulsed power supply for depth denitrogenation and molecular dynamics simulation. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2871-2879.
Oren Y. Capacitive deionization (CDI) for desalination and water treatment-past, present and future (a review)[J]. Desalination, 2008,228:10-29.
[2]
Zhao Y, Hu X M, Jiang B H, et al. Optimization of the operational parameters for desalination with response surface methodology during a capacitive deionization process[J]. Desalination, 2014,336:64-71.
[3]
Suss M E, Porada S, Sun X, et al. Water desalination via capacitive deionization:what is it and what can we expect from it?[J]. Energy Environmental Science, 2015,8:2296-2319.
[4]
Liu Y, Nie C Y, Liu X J, et al. Review on carbon-based composite materials for capacitive deionization[J]. RSC Adv., 2015,5(20):15205-15225.
[5]
Hongsik Y, Jaehan L, Kim S, et al. Hybrid capacitive deionization with Ag coated carbon composite electrode[J]. Desalination, 2017,422:42-48.
[6]
Cai W S, Yan J B, Hussin T, et al. Nafion-AC-based asymmetric capacitive deionization[J]. Electrochimica Acta, 2018,225:407-415.
[7]
Ma J, Wang L, Yu F, et al. Water-enhanced performance in capacitive deionization for desalination based on graphene gel as electrode material[J]. Electrochimica Acta, 2018,263:40-46.
[8]
Feng C J, Tsai C C, Ma C Y, et al. Integrating cost-effective microbial fuel cells and energy-efficient capacitive deionization for advanced domestic wastewater treatment[J]. Chemical Engineering Journal, 2017,330:1-10.
[9]
Yuan L L, Yang X F, Liang P, et al. Capacitive deionization coupled with microbial fuel cells to desalinate low-concentration salt water[J]. Bioresource Technology, 2012,110:735-738.
[10]
Lee K S, Cho Y H, Choo K Y, et al. Membrane-spacer assembly for flow-electrode capacitive deionization[J]. Applied Surface Science, 2018,433:437-442.
[11]
Hassanvand A, Chen G Q, Webley P A, et al. A comparison of multicomponent electrosorption in capacitive deionization and membrane capacitive deionization[J]. Water Research, 2018,131:100-109.
[12]
Yan S C, Kim H, Jeon Si, et al. Analysis of the desalting performance of flow-electrode capacitive deionization under short-circuited closed cycle operation[J]. Desalination, 2017,423:110-121.
[13]
Nativ P, Lahav O, Gendel Y, et al. Separation of divalent and monovalent ions using flow-electrode capacitive deionization with nanofiltration membranes[J]. Desalination, 2018,425:123-129.
[14]
Emekli U, West Alan. Effect of additives and pulse plating on copper nucleation onto Ru[J]. Electrochimica Acta, 2009,54:1177-1183.
[15]
Xia F F, Tian J Y, Wang W C, et al. Effect of plating parameters on the properties of pulse electrodeposited Ni-TiN thin films[J]. Ceramics International, 2016,42:13268-13272.
[16]
Sistat P, Huguet P, Ruiz B, et al. Effect of pulsed electric field on electrodialysis of a NaCl solution in sub-limiting current regime[J]. Electrochimica Acta, 2015,164:267-280.
[17]
Nicolás C A, Pourcelly G, Bazinet L. Impact of pulsed electric field on electrodialysis process performance and membrane fouling during consecutive demineralization of a model salt solution containing a high magnesium/calcium ratio[J]. Journal of Colloid and Interface Science, 2011,361:79-89.
[18]
Nicolás C A, Pourcelly G, Bazinet L. Water splitting proton-barriers for mineral membrane fouling control and their optimization by accurate pulsed modes of electrodialysis[J]. Journal of Membrane Science, 2013,447:433-441.
[19]
赵研,胡筱敏,姜彬慧,等.类超级电容活性炭的电容去离子除盐性能[J]. 东北大学学报:自然科学版, 2013,34(5):727-730. Zhao Y, Hu X M, Jiang B H, et al. Performance of capacitive deionization in saline water by like-super capacitance activated carbon[J]. Journal of Northeastern University (natural science), 2013,34(5):727-730.
[20]
Feng J W, Ding H M, Ma Y Q. Water desalination by electrical resonance inside carbon nanotube[J]. Physical Chemistry Chemical Physics, 2016,DOI:10.1039/C6CP04201E.
[21]
Plimpton S. Fast parallel algorithms for short-range molecular dynamics[J]. Journal of Computer Physics, 1995,117:1-19.
[22]
Bjelkmar P, Larsson P M A, Cuendet B, et al. Comparison of simple potential functions for simulating liquid water[J]. Chem. Theory Comput., 2010,6:459.
[23]
Jorgensen W L, Chandrasekhar J, Madura J D, et al. Comparison of simple potential functions for simulating liquid water[J]. Journal of Chemical Physics, 1983,79:926.
[24]
Rinne K F, Gekle S, Bonthuis D J, et al. Nanoscale pumping of water by AC electric fields[J]. Nano Letter, 2012,12:1780-1783.
[25]
Hockney R W and Eastwood J W. Computer simulation using particles[M]. CRC press, 1988.
