Department of Chemical Engineering and CRC for Contamination Assessment and Remediation of the Environment (CRC-CARE), Curtin University, GPO Box U1987, WA 6845, Australia.
ACS Appl Mater Interfaces. 2012 Oct 24;4(10):5466-71. doi: 10.1021/am301372d. Epub 2012 Sep 18.
We discovered that chemically reduced graphene oxide, with an I(D)/I(G) >1.4 (defective to graphite) can effectively activate peroxymonosulfate (PMS) to produce active sulfate radicals. The produced sulfate radicals (SO(4)(•-)) are powerful oxidizing species with a high oxidative potential (2.5-3.1 vs 2.7 V of hydroxyl radicals), and can effectively decompose various aqueous contaminants. Graphene demonstrated a higher activity than several carbon allotropes, such as activated carbon (AC), graphite powder (GP), graphene oxide (GO), and multiwall carbon nanotube (MWCNT). Kinetic study of graphene catalyzed activation of PMS was carried out. It was shown that graphene catalysis is superior to that on transition metal oxide (Co(3)O(4)) in degradation of phenol, 2,4-dichlorophenol (DCP) and a dye (methylene blue, MB) in water, therefore providing a novel strategy for environmental remediation.
我们发现，具有 I(D)/I(G) >1.4（缺陷石墨）的化学还原氧化石墨烯可有效激活过一硫酸盐（PMS）生成活性硫酸根自由基。生成的硫酸根自由基（SO4(•-)）是一种具有高氧化电位（2.5-3.1 伏 vs 2.7 伏羟基自由基）的强氧化剂，可有效分解各种水污染物。石墨烯的活性高于几种碳同素异形体，如活性炭（AC）、石墨粉（GP）、氧化石墨烯（GO）和多壁碳纳米管（MWCNT）。对石墨烯催化 PMS 活化的动力学研究表明，在水中苯酚、2,4-二氯苯酚（DCP）和染料（亚甲基蓝，MB）的降解中，石墨烯催化优于过渡金属氧化物（Co3O4），因此为环境修复提供了一种新策略。
