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Multi-walled carbon nanotubes (MWCNTs)/peroxydisulfate (PDS) is a green oxidative system for abatement of aqueous organic pollutants, while the powder form and poor cycling performance of the catalyst limit its practical application. To solve these problems, fabricating a MWCNT cathode (negative polarization) to coupling carbocatalysis-driven PDS activation with electrosorption of organic pollutant was previously demonstrated to be a possible solution to these problems. To further improve the activation efficiency of PDS, positive polarization of MWCNT electrode (anode) was adapted to activate PDS for removing acyclovir and phenol in this work. Under a working voltage of 1.2 V, the MWCNT anode was more efficient than the MWCNT cathode and the non-polarized MWCNT electrode for PDS activation and removal of organic pollutants, owing to the enhanced attraction between SO anions and anode. Although the positive/negative polarization of MWCNT electrode doesn't alter the nonradical mechanism involved in MWCNTs/PDS system, theoretical calculations suggest that different polarization affect the electron configuration and oxidative capacity of activated SO bounded to MWCNTs differently, and that the adsorbed SO with stretched S-O bond and much higher oxidative capacity than that in the case of non-polarized MWCNT electrode is responsible for the MWCNTs anode, while adsorbed SO with stretched O-O bond and slightly higher oxidative capacity is responsible for the MWCNTs cathode. Finally, implications of operation parameters including electrode potential, energy cost, pH, etc. on the elimination efficiency by MWCNT anode/PDS system were investigated and the results suggest that the MWCNT anode/PDS is an efficient and economical metal-free electrochemical oxidative system for organic contaminants remediation.
This article was published in the following journal.
Name: Water research
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Microscopy using polarized light in which phenomena due to the preferential orientation of optical properties with respect to the vibration plane of the polarized light are made visible and correlated parameters are made measurable.
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A signaling adaptor protein that contains three PDZ DOMAINS; an SH3 DOMAIN; and a GUANYLATE KINASE-like C-terminal region. It has an essential role in animal development and recruits ion channels, receptors, and signaling molecules to discrete plasma membrane regions of polarized cells in the HEART ATRIA MYOCARDIUM. It functions in the assembly of ADHERENS JUNCTIONS and regulation of CELL PROLIFERATION; synaptogenesis, LYMPHOCYTE ACTIVATION; and controls expression of KV4 POTASSIUM CHANNELS to regulate excitability of CARDIAC MYOCYTES.
Substances used to allow enhanced visualization of tissues.