Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (9): 40-45.doi: 10.3969/j.issn.1000-565X.2010.09.008

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Decomposition Kinetics and Mechanism of Alkaline Hydrogen Peroxide with Transition Metals

Zhang Xue-jin 1.2  Li You-ming 1.2  Lu Rui-jiang 1.2   

  1. 1.State Key Lab of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;2.National Engineering Research Center of Papermaking and Pollution Control,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2009-12-25 Revised:2010-03-16 Online:2010-09-25 Published:2010-09-25
  • Contact: 李友明（1956-），男，教授，主要从事制浆清洁生产与污染控制研究．E-mail：ymli3@scut．edu．cn E-mail:xuejin．z@mail．scut．edu．cn
  • About author:张学金（1980-），男，博士生，主要从事制浆清洁生产与污染控制研究．
  • Supported by:

    国家自然科学基金资助项目（20776055）

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Abstract:

Trace transition metals were introduced in the catalytic decomposition of alkali hydrogen peroxide at va-rious pH values,and the corresponding decomposition kinetics and mechanism were investigated.The results indicate that the decomposition of hydrogen peroxide follows the quasi-first-order law in alkaline conditions,that the quasi-first-order rate constant of the alkali decomposition,kobs,increases with the pH value when 10.0≤pH≤11.6 but decreases when pH11.6,and that kobs reaches the maximum 0.0922 min-1 at 70℃ and pH11.6.Moreover,the effects of pH value and reaction time on the size of transition-metal colloidal particles were also discussed,finding that the average sizes of Mn 2＋ and Fe 3＋ colloidal particles increase with the reaction time and the pH value,respectively.Thus,it is concluded that the decomposition of alkaline hydrogen peroxide is due to the catalytic decomposition of transition metal colloids and the alkaline ionization of hydrogen peroxide.

Key words: hydrogen peroxide, transition metals, decomposition kinetic, mechanism, transition metal colloids