【摘要】 作者定性地研究了25℃,中性(pH6.8)水溶液中金属离子(Cu2+、Fe2+、Fe3+、Co2+和Mn2+)催化H2O2氧化对苯二酚,结果表明Fe2+和Fe3+对对苯二酚的氧化有较好的催化效果,Cu2+有一定的催化能力,而Mn2+和Co2+基本没有催化活性,这主要取决于金属离子与H2O2结合能否产生活性自由基·OH.同时,还定量地研究了CTAB胶束催化H2O2氧化对苯二酚.根据"假相模型"获得了CTAB胶束相中对苯二酚氧化反应的速率常数km以及对苯二酚与CTAB胶束的结合常数KS,这表现出了典型的胶束催化特征.更多还原

【Abstract】 The oxidation of p-benzoquinone with hydrogen peroxide catalyzed by metal ions (Cu²⁺、Fe²⁺、Fe³⁺、Co²⁺、Mn²⁺) has been investigated qualitatively in aqueous solution of pH 6.8 at 25 ℃ in this paper. The results suggested that Fe²⁺ and Fe³⁺ had good catalytic effects on the oxidation of p-benzoquinone with hydrogen peroxide, and Cu²⁺ had certain catalytic effect, however, Mn²⁺ and Co²⁺ had little catalytic effect. This is caused mainly by the formation of free group ·OH through the association of metal ion and H₂O₂. Meanwhile, the oxidation of p-benzoquinone with hydrogen peroxide catalyzed by CTAB micelle has also been studied quantitatively. According to the "pesudophase model", the rate constant k_m and the association constant K_S for the oxidation of p-benzoquinone in CTAB micelle have been obtained, indicating the typical properties of micellar catalysis. The effects of metal ions and CTAB micelle on the oxidation of p-benzopuinone with hydrogen peroxide have been discussed in detail.更多还原