Fenton degradation of sulfanilamide in the presence of Al,Fe-pillared clay: Catalytic behavior and identification of the intermediates

JOURNAL OF HAZARDOUS MATERIALS

卷:293

Article

Khankhasaeva, Sesegma Ts.^1,2  Dambueva, Darima V.¹  Dashinamzhilova, Elvira Ts.¹  Gil, Antonio³  Vicente, Miguel A.⁴  Timofeeva, Maria N.^5,6,7 

[1] RAS, Baikal Inst Nat Management, SB, Ulan Ude 670047, Russia

[2] Buryat State Univ, Ulan Ude 670000, Russia

[3] Univ Publ Navarra, Dept Appl Chem, Pamplona 31006, Spain

[4] Univ Salamanca, Dept Inorgan Chem, E-37008 Salamanca, Spain

[5] RAS, Boreskov Inst Catalysis, SB, Novosibirsk 630090, Russia

[6] Novosibirsk State Univ, Novosibirsk 630090, Russia

[7] Novosibirsk State Tech Univ, Novosibirsk 630092, Russia

关键词: Sulfanilamide;    Oxidation;    Pillared clays;    Hydrogen peroxide;    Degradation intermediates;   

DOI  :  10.1016/j.jhazmat.2015.03.038

来源: Elsevier

【 摘 要 】

Liquid phase catalytic degradation of sulfanilamide with H2O2 was carried out in the presence of Fe,Al/M-pillared clay (Fe,Al/M-MM, M=Na+, Ca2+ and Ba2+) as heterogeneous Fenton type catalyst. Fe,Al/M-MMs were prepared by swelling of layered aluminosilicate (90-95 wt.% montmorillonite) from a bed located in Mukhortala (Buryatia, Russia) in Na+, Ca2+ and Ba2+ forms by means of the exchange of these cations with bulky Fe,Al-polyoxocations prepared at Al/Fe=10/1 and OH/(Al + Fe) = 2.0, and then calcinated at 500 degrees C. XRD method and chemical analysis demonstrated that the rate of crystalline swelling was dependent on the interlayer cations and decreased in the order:Fe,Al-/Na-MM>Fe,Al/Ca-MM>Fe,Al/Ba-MM. It was found that the catalytic properties of Fe,Al/M-MMs depended on the type of exchangeable cations. The effect of the H2O2/sulfanilamide molar ratio, the catalyst content, the reaction temperature and the reaction pH on the removal rate of sulfanilamide has been studied in the presence of Fe,Al/Na-MM. The catalyst can be applied for degradation of sulfanilamide with H2O2 for at least three successive cycles without loss of activity. HPLC analyses pointed out that the main degradation intermediate products were sulfanilic acid, benzenesulfonic acid, p-benzoquinone and aliphatic carboxylic acids. (C) 2015 Elsevier B.V. All rights reserved.

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