Potential of kaolinite as adsorbent to remove anionic surfactant from simulated industrial wastewater

摘要

This paper describes the removal of anionic surfactant sodium dodecyl benzene sulfonate (SDBS) using native kaolinite, activated kaolinite (AKC) and kaolinite clay mineral composite (KCC) as adsorbent materials at bench scale. Another objective of the study was to determine the impact of mineralogical and physiochemical properties of clay on its capacity to adsorb anionic surfactant. Native, AKC and KCC were successfully prepared by precipitation method. FTIR analysis indicated the presence of functional groups like symmetric/anti-symmetric CH2, OH with Al3+ and free OH. XRD pattern confirmed that different minerals like magnesium silicate hydroxide were discovered after activation of kaolinite. Intra particle diffusion model showed that chemical reaction took place with surfactant molecules on the active site of biosorbent. Kinetic and Isothermal model showed that the chemical reaction followed pseudo second order kinetic and Freundlich model respectively. Adsorption was favored at low pH (2, 3, 4) for native, AKC and KCC, low adsorbent dose (0.5 g) and at low temperature (30 degrees C). The experimental results exhibited the 71% removal of SDBS after only 60 min by KCC. The results suggest that KCC could become excellent candidate for making commercial adsorbent materials.