Highly Efficient\nAdsorption of Organic Impurities\nin Industrial-Grade H<sub>2</sub>O<sub>2</sub> Using π–π\nInteraction

Electronic-grade H<sub>2</sub>O<sub>2</sub> with few\nimpurities\nis crucial for the preparation of semiconductor chips. The organic\nimpurities in H<sub>2</sub>O<sub>2</sub> produced by the anthraquinone\nmethod are difficult to completely remove. Herein, KOH-modified activated\ncarbon (KAC) is prepared to promote the adsorption of organic impurities\nthrough copious π–π interaction. The results indicate\nthat KAC-800 showed an excellent adsorption capacity of organic impurities.\nThe removal rates of organic impurities in 35 wt % H<sub>2</sub>O<sub>2</sub> and 50 wt % H<sub>2</sub>O<sub>2</sub> can reach ∼100%\nand 98.2%, respectively. Besides, the adsorption process of KAC-800\nwas based on the pseudo-second-order adsorption isotherm and Freundlich\nkinetic model. Therefore, KAC-800 is an effective and suitable adsorbent\nfor eliminating organic impurities in H<sub>2</sub>O<sub>2</sub>.