摘要
金属冶金产生大量含Na^(+)的高盐废水,处理难度高,严重危害生态环境和人类健康。电容去离子技术(CDI)被认为是最优选的高盐废水处理技术之一,但MnO_(2)材料吸附速度慢、电荷存储能力有限,这严重限制了其在高性能CDI领域的应用。对形貌进行调控则是提升MnO_(2)材料电容性能的有效方法。本文通过简便的水热法制备了蛋卷状δ-MnO_(2)(D-δ-MnO_(2)),以增强其在CDI中吸附Na^(+)的性能。研究结果表明:D-δ-MnO_(2)具有优异的吸附Na^(+)性能,最大吸附速率达8.13 mg·g^(-1)·min^(-1),超高吸附容量达86.97 mg·g^(-1),显著高于其他MnO_(2)材料的电吸附性能;材料的电荷存储机制主要包括扩散控制和双电层电容(EDL)控制2种途径,为优化其电吸附Na^(+)性能提供了理论依据和技术指导。
Metal metallurgy processes generate substantial amounts of high-salinity wastewater containing elevated sodium ion(Na⁺)concentrations,which poses significant treatment challenges and seriously endangers ecological environments and human health.Capacitive deionization(CDI)technology is regarded as one of the most promising solutions to addressing high-salinity wastewater treatment.The poor salt removal rates and limited charge-storage capacities of MnO_(2)materials have consistently restricted their use in high-performance capacitive deionization(CDI).Morphology management is thought to be a useful strategy for enhancing the capacitive performances of MnO_(2)materials.Herein,an eggroll-likeδ-MnO_(2)material was prepared by a simple hydrothermal method to enhance the electrosorption performance in the CDI.The results show thatδ-MnO_(2)exhibits the extraordinary electrosorption performance with the maximum deionization rate of 8.13 mg·g^(-1)·min^(-1),accompanied by ultrahigh adsorption capacity of 86.97 mg·g^(-1).The adsorption capacity is higher than that of other MnO_(2)materials.The two primary methods for storing charge are diffusion-controlled procedures and electrical double-layer(EDL)capacitive.These findings elucidate the electrochemical adsorption mechanism of MnO_(2)and offer suggestions for enhancing their desalination performance.
作者
孙竹梅
王云燕
李颖
白红娟
刘鹏霄
傅杰
童天星
陈庆斌
乔怡娜
SUN Zhumei;WANG Yunyan;LI Ying;BAI Hongjuan;LIU Pengxiao;FU Jie;TONG Tianxing;CHEN Qingbin;QIAO Yina(School of Environmental and Safety Engineering,North University of China,Taiyuan 030051,China;School of Metallurgy and Environment,Central South University,Changsha 410083,China;Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution,Changsha 410083,China)
出处
《中南大学学报(自然科学版)》
北大核心
2025年第8期3394-3404,共11页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52374417)
湖南省科技创新计划项目(2024RC1014)
国家重点研发计划项目(2023YFC3904103,2023YFC3206400)。
作者简介
通信作者:乔怡娜,博士,副教授,从事环境功能材料研究,E-mail:qiaoyina@nuc.edu.cn。
