Release Time:2020-03-10  Hits:

Indexed by: Journal Papers

Date of Publication: 2020-02-04

Journal: ENVIRONMENTAL SCIENCE & TECHNOLOGY

Included Journals: SCIE、EI、PubMed

Volume: 54

Issue: 3

Page Number: 1920-1928

ISSN: 0013-936X

Abstract: A monolithic porous-carbon (MPC) electrode was fabricated to simultaneously intensify mass transfer and enhance reaction activity. The MPC involved channel arrays (about 50 mu m of diameter for each channel) with mesopores and micropores in channel walls. The abundant surface pores may improve the reaction efficiency of the reduction of O-2 to produce H2O2 and center dot OH. The function of channel arrays was to shorten the mass-transfer distance not only from O-2 to the electrode surface but also from pollutants to the electrode surface and center dot OH. A microchannel electrochemical reactor was assembled to evaluate the performance of the MPC cathode. For 20 mg/L of phenol, sulfamethoxazole or atrazine, effluent concentration and total organic carbon (TOC) decreased down to 1.5 and 3 mg/L, respectively, in a retention time of only 100-300 s. Phenol removal was dominated by the MPC cathode, and the contribution of cathodic adsorption, cathodic degradation, and anodic reaction was 46, 33, and 8%, respectively. The proper working potential for the MPC cathode was +0.26 to +0.6 V versus reversible hydrogen electrode; in this potential range, no scaling was observed. For the real surface water (the initial TOC was 41.5 mg/L), TOC in effluent (the retention time was 335 s) was stable at 31.0 mg/L.