Carboxylic acid Functionalized Halloysite for the Removal of Methylene Blue from Simulated Textile Wastewater

In this paper, carboxylic acid groups were synthesized into the halloysite mineral adsorbent (HNT). For this purpose, raw HNT was first washed with HCl and functionalized with 3-amino poropyltriethoxysilane (APTES). In the next step, HNT-NH2 was reacted with succinic anhydride in order to create carboxylic acid groups into the structure. The synthesis process was investigated by FTIR spectra which indicated the addition of carboxylic acid groups to the structure of HNT to increase the adsorption capacity of methylene blue. The optimum adsorbent dosage and pH for dye removal were obtained to be 0.3 g/L and 9, respectively