As a semiconductor material with great potential for advanced catalytic degradation, TiO2 nanomaterials can directly use photon energy to deeply degrade pollutants, reduce CO2, fix N2, catalyze to H2, etc., and nano TiO2 has attracted much attention in the environmental and energy fields with its excellent performance, stability and environmental protection characteristics. However, due to the large bandgap width, small response range to visible light, low solar energy utilization efficiency, and weak photoelectric conversion, nano-TiO2 itself cannot be widely and deeply applied. Nano-titanium dioxide itself has some potential for chlorination removal, but it often needs to be combined with specific resins and other materials to improve chlorination or achieve better applications. Our LH-420TD resin is a type of polymer material with ion exchange function, which can remove or separate specific ions by exchanging ions with ions in solution. In the process of chlorination removal, ion exchange resin can exchange with chlorine-containing ions to adsorb chloride ions onto the resin, thereby achieving the purpose of chlorine removal. When nano-titanium dioxide is combined with ion exchange resins, nano-titanium dioxide can be used as an auxiliary material to enhance the adsorption or catalytic properties of the resin. For example, the high specific surface area and special surface properties of nano-titanium dioxide can increase the contact area with chloride ions and improve the chlorine removal efficiency. At the same time, nano-titanium dioxide can also catalyze the redox reaction of chloride ions under certain conditions, convert chloride ions into other harmless substances, and further improve the chlorine removal effect.