The results showed that cerium ion can clear O - 2. The mechanism is: (1) Ce 3+ can reduce O - 2 to H 2O 2 and itself oxidates to Ce 4+ .

• 从而得知，铈离子可清除O－2，其机理为：Ce3＋供给O－2电子氧化为Ce4＋，O－2还原为H2O2；