Cross-stacked super-aligned carbon nanotube/activated carbon composite electrodes for efficient water purification via capacitive deionization enhanced ultrafiltration  

作　　者：Min Li Shuai Liang Yang Wu Meiyue Yang Xia Huang 

机构地区：[1]Beijing Key Laboratory for Source Control Technology of Water Pollution,College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China [2]Department of Mechanical Engineering and Tsinghua Foxconn Nanotechnology Research Center,Tsinghua University,Beijing 100084,China [3]State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China

出　　处：《Frontiers of Environmental Science & Engineering》2020年第6期181-190,共10页环境科学与工程前沿（英文）

基　　金：The authors gratefully acknowledge the financial support from the Beijing Municipal Natural Science Foundation(Nos.8192030 and L182026);Fundamental Research Funds for the Central Universities(No.2016ZCQ03);National Natural Science Foundation of China(Nos.51608038 and 21975140).

摘　　要：The practical application of the capacitive deionization(CDI)enhanced ultrafiltration(CUF)technology is hampered due to low performance of electrodes.The current study demonstrated a novel super-aligned carbon nanotube(SACNT)/activated carbon(AC)composite electrode,which was prepared through coating AC on a cross-stacked SACNT film.The desalination capability and water purification performance of the prepared electrode were systematically investigated at different applied voltages(0.8-1.2 V)with a CDI system and a CUF system,respectively.In the CDI tests,as compared with 5ie control AC electrode,the SACNT/AC electrode achieved an approximately 100%increase in both maximum salt adsorption capacity and average salt adsorption rate under all the applied voltage conditions,demonstrating a superior desalination capability.Meanwhile,a conspicuous increase by an average of-26%in charge efficiency was also achieved at all the voltages.In the CUF tests,as compared with the control run at 0 V,the treatment runs at 0.8,1.0,and 1.2 V achieved a 2.40-fold,2.08-fold,and 2.43-fold reduction in membrane fouling(calculated according to the final transmembrane pressure(TMP)data at the end of every purification stage),respectively.The average TMP increasing rates at 0.8,1.0,and 1.2 V were also roughly two times smaller than that at 0 V,indicating a dramatical reduction of membrane fouling.The SACNT/AC electrode also maintained its superior desalination capability in the CUF process,resulting in an overall improved water purification efficiency.

关 键 词：Carbon nanotube Super aligned Conductive membrane Capacitive deionization ULTRAFILTRATION DESALINATION 

分 类 号：X172[环境科学与工程—环境科学] X592