摘要
导电剂种类及其添加量是影响膜电容去离子(MCDI)脱盐性能的重要因素.以活性炭为活性吸附材料,分别选取石墨、碳纳米管和炭黑作为导电剂制备电极,深入探究了3种导电剂及其掺杂量对MCDI脱盐性能的影响.实验结果表明,掺杂适量炭黑和碳纳米管能显著提升电极的吸附容量、脱盐速度及降低脱盐能耗.活性炭与炭黑质量比为8∶1时,电极吸附容量可达15.84 mg·g^(-1),比不掺加炭黑时提高了1.15倍;活性碳与碳纳米管质量比为57.6∶1时,电极吸附容量可达12.62 mg·g^(-1);但掺杂石墨的活性炭基电极在提升吸附容量、降低能耗上都没有明显变化.动力学拟合结果表明,本研究中掺杂石墨、碳纳米管及炭黑的活性炭基电极材料脱盐过程均符合准二级动力学方程.
The type and content of conductive additives are crucial factors affecting the desalination performance of membrane capacitive deionization(MCDI)system. In this paper,activated carbon was used as active adsorption material,whereas graphite,carbon nanotube and carbon black were selected as conductive additives to prepare electrodes. The effects of three conductive additives and their amounts on the performances of MCDI system were thoroughly studied. The experimental results showed that using carbon black and carbon nanotubes as conductive additives can significantly enhance the salt adsorption capacity,adsorption salt removal rate and specific energy consumption. When the setting the mass ratio of activated carbon to carbon black at 8∶1,the salt adsorption capacity of MCDI could reach 15.84 mg·g^(-1). When the mass ratio of activated carbon to carbon nanotubes was 57.6∶1,the salt adsorption capacity of the electrode could reach 12.62 mg·g^(-1). However,adding graphite into the electrode had no significant improvement to MCDI performances. The kinetic fitting results showed that the desalination process of activated carbon based electrode materials doped with graphite,carbon nanotubes and carbon black in current followed the quasi second-order kinetic equation.
作者
沈格
刘洁
王晓菊
马俊俊
牛建瑞
刘春
张瑞娜
SHEN Ge;LIU Jie;WANG Xiaoju;MA Junjun;NIU Jianrui;LIU Chun;ZHANG Ruina(Academy of Environmental Science,Hebei University of Science and Technology,Shijiazhuang 050000;Biotechnology Laboratory for Pollution Control in Hebei Province,Shijiazhuang 050000)
出处
《环境科学学报》
CAS
CSCD
北大核心
2022年第10期293-302,共10页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.51808186)
河北省自然科学青年基金(No.B2021208035)。
关键词
膜电容去离子技术
导电剂种类
添加量
性能
动力学
membrane capacitive deionization
type of conductive agent
add the amount
performance
dynamics
