Heterogeneous fenton process using the mineral hematite for the discolouration of a reactive dye solution
Heterogeneous fenton process using the mineral hematite for the discolouration of a reactive dye solution
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DOI：
10.1590/s0104-66322011000400006
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发表时间：
2011-12-01
影响因子：
1.2
通讯作者：
Campos, J. C.
中科院分区：
文献类型：
--
作者：
Araujo, F. V. F.;Yokoyama, L.;Campos, J. C.
本文研究了赤铁矿悬浮液中的非均相Fenton反应对活性染料Drimarene Red X-60BN的脱色作用。考察了初始pH、H_2O_2投加量、赤铁矿矿粉浓度等实验条件对反应动力学的影响。在最佳实验条件：pH=2.5，H_2O_2投加量=800 mg/L，[赤铁矿]=20g/L的条件下，在25℃的间歇反应120分钟内，脱色率可达99%左右。动力学分析表明，该反应是由赤铁矿表面非均相生成的自由基引发的，但在反应过程中，由于可溶铁(III)和铁(II)物种被释放到溶液中，一个同时均相的芬顿反应步骤扩展，并对整个反应做出贡献。
This work reports a study on the heterogeneous Fenton reaction using hematite powder (Fe2O3) in suspension for the discolouration of the reactive dye Drimarene Red X-6BN in aqueous solutions. The efficiency of the process was studied as a function of the experimental conditions: initial pH; H2O2 dose; and hematite powder concentration; all of which showed a strong effect on the reaction kinetics. Under the best experimental conditions: pH = 2.5; H2O2 dose = 800 mg/L; and [Hematite] = 20 g/L, it was possible to remove about 99% of the initial colour in 120 minutes in a batch reaction at 25 degrees C. The analysis of the kinetic results suggests that the reaction is initiated by heterogeneous generation of free radicals on the hematite surface, but as soluble iron (III) and iron (II) species are released into the solution during the course of the reaction, a simultaneous homogeneous Fenton reaction step propagates and contributes to the overall reaction.