| Autor: |
Wang, Yilei, El-Deen, Ahmed G., Li, Peng, Oh, Bernice H.L., Guo, Zanru, Khin, Mya Mya, Vikhe, Yogesh S., Wang, Jing, Hu, Rebecca G., Boom, Remko M., Kline, Kimberly A., Becker, David L., Duan, Hongwei, Chan-Park, Mary B. |
| Zdroj: |
ACS Nano; October 2015, Vol. 9 Issue: 10 |
| Abstrakt: |
Water disinfection materials should ideally be broad-spectrum-active, nonleachable, and noncontaminating to the liquid needing sterilization. Herein, we demonstrate a high-performance capacitive deionization disinfection (CDID) electrode made by coating an activated carbon (AC) electrode with cationic nanohybrids of graphene oxide-graft-quaternized chitosan (GO-QC). Our GO-QC/AC CDID electrode can achieve at least 99.9999% killing (i.e., 6 log reduction) of Escherichia coliin water flowing continuously through the CDID cell. Without the GO-QC coating, the AC electrode alone cannot kill the bacteria and adsorbs a much smaller fraction (<82.8 ± 1.8%) of E. colifrom the same biocontaminated water. Our CDID process consists of alternating cycles of water disinfection followed by electrode regeneration, each a few minutes duration, so that this water disinfection process can be continuous and it only needs a small electrode voltage (2 V). With a typical brackish water biocontamination (with 104CFU mL–1bacteria), the GO-QC/AC electrodes can kill 99.99% of the E. coliin water for 5 h. The disinfecting GO-QC is securely attached on the AC electrode surface, so that it is noncontaminating to water, unlike many other chemicals used today. The GO-QC nanohybrids have excellent intrinsic antimicrobial properties in suspension form. Further, the GO component contributes toward the needed surface conductivity of the CDID electrode. This CDID process offers an economical method toward ultrafast, contaminant-free, and continuous killing of bacteria in biocontaminated water. The proposed strategy introduces a green in situdisinfectant approach for water purification. |
| Databáze: |
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