Preparation of Quaternary Ammonium Separation Material based on Coupling Agent Chloromethyl Trimethoxysilane (KH-150) and Its Adsorption and Separation Properties in Studies of Th(IV).

For the material SG-CTSQ 4 with the highest grafting amount ( Figure 12 d), when the HNO 3 concentration is in a lower range (1–5 mol·L −1 ), the adsorption amount of Th(IV) by SG-CTSQ 4 gradually increases with increasing acid concentration; however, as the concentration continues to increase, the adsorption amount shows a decreasing trend, which may be due to the increase in H + concentration or NO 3 − concentration.

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