Direct Orange 34 dye fixation by modified kaolin
作者： H. Chargui , W. Hajjaji , J. Wouters , J. Yans , F. Jamoussi
DOI: 10.1180/CLM.2018.18
关键词:
摘要: The present study investigated the adsorption behaviour of Direct Orange 34, a highly toxic dye used in textile industries Tunisia, on modified kaolinite-rich clays. A kaolin from Sidi Bader (SDB) area was activated with hydrochloric acid to create clay referred hearafter as SDBa, or treated FeSO4•7H2O obtain its Fe-saturated form, Fe-SDB. adsorbents were characterized by X-ray diffraction, fluorescence, transmission electron microscopy, BET surface and zeta-potential measurements. equilibrium data analysed using Langmuir Freundlich isotherms. estimated capacities (qm) for improved Fe-loaded samples. good fit (R2 = 0.99) pseudo-second order expression suggests that process could be effective following chemisorption mechanism. At acidic pH, optimum dye-retention rate achieved SDB (83%) after 60 min. uptake decreased at neutral pH increased again alkaline media. This might explained formation covalent bonds between OH radicals external negatively charged molecules. On other hand, Fe impregnation zeta potential kaolinite, leading greater capacity compared natural acid-activated counterparts. In addition, when increasing suspension temperature 283 313 K. materials showed satisfactory affinity adsorbing this reactive dye.
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