In this study, strong anion exchange hyper-crosslinked resin was used for the removal of rare earth element, lanthanum. Poly (styrene-co-EDGMA-co-VBC) is a resin that was synthesized and used in this research. The objective of this research is to study the pH stability and to evaluate the resin for lanthanum removal by using the Solid Phase Extraction (SPE) batch method where the influent of lanthanum solution will be loaded to the designed column containing resin. The pH stability test of resin was studied at different pH (pH 2-5). The evaluation of resin for resin loading (0.5, 1.0, and 1.5 g) and concentration of lanthanum (10, 30, and 50 ppm) were investigated. From the experiment, the resin is stable in acid solution since there is no change in the functional group. The morphology surface using Scanning Electron Microscope (SEM) shows a rough surface and beads attach on the resin without porous on the surface of resin except the resin at the condition of 50 ppm of with 1.0g resin. The resin that performed at 50 ppm with 1.0 g was successful remove lanthanum for 26.7 ppm based on ICP-MS analysis. As a conclusion, this resin can be used for removal of lanthanum.
This study is present the result of synthesizing crosslinked anion exchange (CAX) resin bearing quaternary ammonium functionalities. Crosslinked anion exchange of poly(HEMA-co-EGDMA-co-VBC) were synthesized via the modified suspension polymerization technique, then treated in hyper-crosslinking reaction to increase specific surface area (SSA) of CAX beads resin from ~5 to 124 m2/g and followed by amination treatment with N,N-dimethylbutylaminee (DMBA) to obtain CAX resin. After functionalized process, the amount of nitrogen content increased and intensity at 1265 cm-1 that assigned for chloromethyl group has decreased, showing that DMBA successfully being attached to the backbone. CAX resin was fully characterized by using Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FT-IR) respectively. A pre-evaluation study was carried to investigate the performance of CAX beads resin to remove nitrate by using ion exchange method. Three parameters were used to study the sorption process; contact time, influent concentration and amount of resin used. For overall sorption, the sorption managed to obtain 88 % nitrate removal by using 0.5 g of CAX resin at 50 ppm influent concentration within 1-hour contact time and the highest adsorption of CAX achieved was 93 % removal of nitrate ions within 4-hours contact time.
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