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施氏矿物/H2O2体系对废水中甲基橙的降解性能及机理
薛旭东1, 王永平1, 张思敬2
0
(1.陕西省环境科学研究院;2.西安建筑科技大学理学院)
摘要:
通过化学法合成施氏矿物,研究施氏矿物/H2O2体系对废水中甲基橙的氧化降解性能。同时分析了溶液初始pH、施氏矿物/H2O2投加量、共存阴离子等因素对甲基橙降解的影响,在此基础上对降解机理进行了初步探讨。结果表明,施氏矿物/H2O2体系有效拓宽了传统Fenton反应的pH值范围,当溶液初始pH为3.0~5.0、甲基橙浓度为10 mg?L-1,施氏矿物和H2O2投加量分别为1.0 g?L-1和800 mg?L-1、经过12 h反应后,废水中甲基橙降解率可达97.0%;而当初始溶液pH>5.0时,甲基橙的降解被抑制。无机阴离子对甲基橙降解率的影响微弱,在Cl-、NO3-、SO42-共存条件下,经过12h反应后,甲基橙降解率仍可达90%以上。施氏矿物具有良好的重复利用性能,经6个反应周期后,甲基橙的降解率仍可达93.4%。降解机理研究表明,施氏矿物/H2O2体系催化降解甲基橙过程中,?OH为主要氧化剂。
关键词:  施氏矿物/H2O2  氧化降解  甲基橙  降解机理
DOI:
投稿时间:2018-09-25修订日期:2019-03-31
基金项目:
Oxidative degradation of methyl orange by Schwertmannite/H2O2 system
Abstract:
Chemosynthetic schwertmannite and H2O2 were used to facilitate the degradation of methyl orange (MO) in organic wastewater. Factors influencing the degradation were investigated in detail such as the dosages of Schwertmannite and H2O2, pH, and coexisting anions, etc, Also,degradation mechanism was explored. The main results showed that Schwertmannite/H2O2 system effectively broadens the pH range of traditional Fenton reaction. For the effluent containing 10mg?L-1MO, degradation rate reached 97% within 12 h at an initial pH 3.0 to 5.0, dosages of Schwertmannite and H2O2 were 1.0 g?L-1 and 800 mg?L-1 respectively. However, when the initial pH was higher than 5.0, the degradation of MO was strongly inhibited, Degradation of MO decreased to a certain extent in the presence of coexisting inorganic anions (Cl-、NO3-、SO42-), but more than 90.0% of MO was still removed by Schwertmannite/H2O2 system if by coexisting inorganic anions, The reusability of Schwertmannite/H2O2 system was evaluated by successive cycles, After 6 cycles, 93.4% of MO could still be degraded by oxidation, suggesting that Schwertmannite/H2O2 system exhibits good durability. Degradation mechanism revealed that hydroxyl free radical (?OH) played a major role in MO degradation in Schwertmannite/H2O2 system.
Key words:  Schwertmannite/H2O2  oxidation degradation  methyl orange  mechanism