Abstract:
The objective of this research is to study the removal of acid blue 45 from synthetic wastewater by using surface modified superparamagnetic adsorbents. This research was separated into 2 parts. The first part is the study of adsorption efficiency in batch system by comparing 6 types of superparamagnetic adsorbents; hexagonal mesoporous silica (HMS-SP), hexagonal mesoporous silica functionalized with amino functional group (A-HMS-SP), hexagonal mesoporous silica functionalized with mercapto functionial group (M-HMS-SP), silica (S-SP), silica functionalized with amino functional group (A-S-SP) and silica functionalized with mercapto functional group (M-S-SP). AB-45 adsorption kinetic of all adsorbents can be fitted by pseudo 2nd order model with high correlation. The study of adsorption isotherm was conducted by controlling pH at 7 and ionic strength at 0.01 M. The obtained adsorption isotherms of all adsorbents are compatible with Freundlich isotherm. The second part is the study of adsorbent separation by stainless fiber under magnetic field. The A-HMS-SP which has the highest AB-45 adsorption capacity was applied in this study. The effect of magnetic fields on stainless fiber filter column study was operated by this followed condition; 1.5-3 cm height, 95.28% - 98.43% porosity, concentration of adsorbent at 0.5-5 g/L, velocity at 16.43 - 65.73 cm/min. From obtained results; applying magnetic field into stainless fiber can increase the A-HMS-SP separation efficiency. Increase of the height and porosity of stainless fiber column can increase the separation efficiency of A-HMS-SP. However, increase of flow velocity and particle concentration decrease the separation efficiency of A-HMS-SP. Hydrophobicity modification of stainless fiber did not affect the separation efficiency of A-HMS-SP. Moreover, separation efficiencies of porous and particle adsorbents were not different, significantly.