• 文献标题:   Graphene-based sponges for electrochemical degradation of persistent organic contaminants
  • 文献类型:   Article
  • 作  者:   BAPTISTAPIRES L, NORRA GF, RADJENOVIC J
  • 作者关键词:   reduced graphene oxidecoated sponge, atomicdoped graphene, electrochemical water treatment, chlorinefree electrochemical system, organic pollutant
  • 出版物名称:   WATER RESEARCH
  • ISSN:   0043-1354 EI 1879-2448
  • 通讯作者地址:  
  • 被引频次:   15
  • DOI:   10.1016/j.watres.2021.117492 EA AUG 2021
  • 出版年:   2021

▎ 摘  要

Graphene-based sponges doped with atomic nitrogen and boron were applied for the electrochemical degradation of persistent organic contaminants in one-pass, flow-through mode, and in a low-conductivity supporting electrolyte. The B-doped anode and N-doped cathode was capable of >90% contaminant removal at the geometric anodic current density of 173 A m(-2). The electrochemical degradation of contaminants was achieved via the direct electron transfer, the anodically formed O-3, and by the OH center dot radicals formed by the decomposition of H2O2 produced at the cathode. The identified transformation products of iopromide show that the anodic cleavage of all three C-I bonds at the aromatic ring was preferential over scissions at the alkyl side chains, suggesting a determining role of the pi-pi interactions with the graphene surface. In the presence of 20 mM sodium chloride (NaCl), the current efficiency for chlorine production was <0.04%, and there was no chlorate and perchlorate formation, demonstrating a very low electrocatalytic activity of the graphene-based sponge anode towards chloride. Graphene-based sponges were produced using a low-cost, bottom-up method that allows easy introduction of dopants and functionalization of the reduced graphene oxide coating, and thus tailoring of the material for the removal of specific contaminants.