REMOVAL OF DISINFECTION BY-PRODUCTS IN WATER BY ADSORPTION ON THIOL-FUNCTIONALIZED MESOPOROUS MATERIAL

Abstract

The main objective of this research is to study the removal of disinfection by-product (DBPs) in water by adsorption on thiol-functionalized mesoporous material. Thiol-functionalized mesoporous composite based on natural rubber and hexagonal mesoporous silica (NR/HMS-SH) was synthesized to investigate adsorption efficiency and mechanism compared with powder activated carbon (PAC). Fourier-transform infrared spectroscopy (FTIR) results revealed the functional group of NR/HMS-SH and the sulfur content that confirming the presence of thiol group was measured by elemental analyzer. X-ray diffraction (XRD) was used to evaluate crystalline structure and analyze the structure of NR/HMS-SH. Moreover, adsorption kinetics and isotherm models were used to determine the adsorption mechanism and the adsorption selectivity of adsorbent on adsorption of DBPs in tap water was investigated. The result indicated that adsorption onto the NR/HMS-SH and PAC of dichloroacetronitrile (DCAN), trichloromethane (TCM) and 1,1,1-trichloroacetone (C3H3Cl3O) presence the higher adsorption capacity than dichloroacetic acid (DCAA). Furthermore, the different molecular structure of HANs and the ion-dipole electrostatic interaction of TCM and C3H3Cl3O affected the adsorption capacity and selectivity in both of single and mixed solute. In addition, the result of natural organic carbon (NOM) showed that the hydrophobic (HPO) NOM decreased the adsorption capacity of DCAN adsorption on synthesized material while hydrophilic (HPI) NOM did not prefer the decreasing of adsorption capacity on NR/HMS-SH. It might be cause of the adsorption competition on adsorbent surface.