This study investigates the adsorption ability of birnessite for removal of Pb2+. As part of efforts to examine the adsorption capacities of some birnessites for Pb2+, batch isotherm tests were carried out. Na-birnessite was synthesized through the oxidation of Mn2+ in alkali solution.
TMA-birnessite was synthesized under intercalation-deintercalation reactions using Na-birnessite as tetramethylammonium (TMA) hydroxide solution as organic surfactants. Al-TMA-birnessite was synthesized
using TMA-birnessite as alginic acid sodium solution as immobilization.
All the synthesized birnessites were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy (FT-IR), brunauer, emmett, teller (BET). The modification using tetramethylammonium (TMA) hydroxide solution showed the higher adsorption ability for Pb2+ than Na-birnessite and GAC1240 (granular activated carbon). On the other hand, the maximum dsorption capacity, Qmax of TMA-birnessite estimated by Langmuir model was 292 mg/g, which was the highest compare to Na-birnessite, GAC1240 and Al-TMA-birnessite. Permeable reactive barrier technologies for
groundwater remediation have drawn great attention. The selection of barrier materials is an important issue to remove a contaminant groundwater by heavy metals. This study was to investigate adsorption characteristics by column test of Al-TMA-birnessite as barrier materials
in order to adsorb Pb2+. The analysis of breakthrough time and capacity by Thomas model was 470 hour and 256.36 mg/g. This study demonstrates that on heavy metal ions such as Pb2+ can be effectively removed using Organic-birnessite.