电解
电化学
成核
扩散
阴极
化学
软化
电解水
化学工程
扩散层
电极
材料科学
无机化学
热力学
电解质
复合材料
物理化学
有机化学
物理
工程类
作者
Wei Mao,Yuwei Gu,Wenda Kang,Hongtao Yu
出处
期刊:Water Research
[Elsevier]
日期:2023-08-01
卷期号:242: 120195-120195
被引量:9
标识
DOI:10.1016/j.watres.2023.120195
摘要
Electrochemistry is a potential method for water softening. An essential disadvantage is OH¯ ions from water electrolysis accumulate on cathode surface, inducing the generation of the insulating CaCO3 layer and then interrupting the electrochemical reaction. In order to propel OH¯ diffusion into the bulk solution instead of aggregation at cathode, we designed an electrochemical reactor, whose electrodes were placed horizontally in the middle of the reactor, and the bubbles created by water electrolysis move upward, while the water flows downward. The visual evidence displayed that the unique reactor structure allowed OH¯ to spread to almost all the solution rapidly. Average pH value of bulk solution reached 10.6 in only 3 min. Therefore, homogeneous nucleation of CaCO3 in bulk solution would take primary responsibility for water softening, and the softening efficiency is up to 212.9 g CaCO3/h/m2, higher than reported results. The reactor is easy to scale up, providing a new idea for the softening of circulating cooling water.
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