چكيده به لاتين
In this thesis, the application of nanostructures SBA-15 modified with zirconium in simultaneous and competitive removal of methylene blue (MB) and malachite green (MG) by solid phase extraction was investigated. For contacting adsorbent and dyes, an ultrasound bath was used. In this condition, removal was done in minimum of time. Five factors, such as initial MB concentration, initial MG concentration, adsorbent dosage, sonication time and pH were inspected. The optimization of effective parameters in removal of dyes, done by central composite design(CCD) under response surface methodology (RSM). The optimum points obtained, 6.66 mg of adsorbent dosage, 10.21mg L-1 initial MB concentration, 5.48mg L-1 initial MG concentration, sonication time 4.78 min, pH 7.15. The maximum adsorption capacity of 310.88 and 140.61 mg g−1 was obtained for MB and MG removal respectively. After kinetic studies and calculation of the relevant equations, the graphs of the kinetic and isotherm turned out, that the simultaneous adsorption process for these dyes followed pseudo-second order and Langmuir isotherm.
