The catalytic effects and mechanisms of the ozone/carbon nanotube (O3/CNT) process using para-chlorobenzoic acid (pCBA) were evaluated. To use pCBA as an O3-resistant OH• probe compound in a pure water system at pH 7, an adequate amount of scavenger was needed. During the O3/CNT process, a synergetic catalytic effect by OH• generation on the CNT surface could be evaluated in the condition of excess tert-butyl alcohol (TBA) concentration. The OH• radicals were generated and existed on both the bulk phase and CNT surface. The OH-ct values of the CNT surface and bulk phase in the O3/CNT process for 10 min were 2.1 × 10−5 and 2.5 × 10−5μ M·s, respectively. In modifying CNT evaluation, the catalytic effects were the most apparent in the following order: CNT treated with acid then heat (CNT-T), original untreated CNT (CNT-O), and CNT treated with an acid (CNT-A).
Bibliographical noteFunding Information:
This work is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2013R1A2A2A05006466) and Korea Ministry of Education (MOE) as “BK21 PLUS Project.”
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Environmental Chemistry