Organic dye degradation through peroxymonosulfate catalyzed by reusable graphite felt/ferriferrous oxide: Mechanism and identification of intermediates

被引:113
作者
Ahmadi, Mehdi [1 ,2 ]
Ghanbari, Farshid [3 ]
机构
[1] Ahvaz Jundishapur Univ Med Sci, Environm Technol Res Ctr, Ahvaz, Iran
[2] Ahvaz Jundishapur Univ Med Sci, Sch Publ Hlth, Dept Environm Hlth Engn, Ahvaz, Iran
[3] Abadan Sch Med Sci, Dept Environm Hlth Engn, Abadan, Iran
关键词
Sulfate radical; Intermediates; Magnetic catalyst; Peroxymonosulfate; Graphite felt; FE3O4 MAGNETIC NANOPARTICLES; HETEROGENEOUS CATALYST; ACTIVATE PEROXYMONOSULFATE; EFFICIENT DEGRADATION; OXIDATIVE-DEGRADATION; FACILE SYNTHESIS; FENTON PROCESS; WASTE-WATER; SULFATE; CONTAMINANTS;
D O I
10.1016/j.materresbull.2018.10.027
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A graphite felt/magnetite nanocomposite (GFMN) was synthesized and the corresponding characteristics were studied through X-ray powder diffraction (XRD), field emission scanning electron microscope (FESEM), vibrating sample magnetometer (VSM), Brunauer-Emmett-Teller (BET) specific surface area and energy dispersive spectroscopy (EDS). Catalytic activity of GFMN was investigated on peroxymonosulfate (PMS) activation to decolorize acid yellow 36 (AY36). Complete decolorization was obtained under conditions of PMS = 2 mM, 128 mg/L GFMN, pH = 6 and 25 mM time. Heat regeneration of GFMN was an efficient method for six cycles of reuse. GFMN also exhibited high activity for the activation of other chemical oxidants (persulfate, hydrogen peroxide and percarbonate) to degrade AY36. Both radicals (SO4- and HO.) were responsible in the degradation of AY36. Intermediates of AY36 degradation were identified and a plausible pathway was proposed. Overall, GFMN was a reusable, efficient and stable nanocomposite for catalytic degradation of organic pollutants.
引用
收藏
页码:43 / 52
页数:10
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