Abstract
99Tc is one of the critical fission products in the treatment of wastewater and the nuclear waste repository due to its long half-life (t1/2 = 2.13 × 105 y), high fission yield (~6%), and high mobility in the environment. The development of highly-efficient, low-cost and easily available materials that can rapidly and selectively remove 99Tc is of great significance, but remains a challenge. In this work, bentonite-based materials (HDPy-bent) were obtained through modifying bentonite with hexadecylpyridinium (HDPy) and applied for the remove of TcO4− as well as its surrogate ReO4−. The structure of HDPy-bent (e.g., the values of d001) was evaluated and the maximum loading amount of HDPy on bentonite was found to be 200% CEC. The loaded HDPy+ might replace exchangeable cations in the inter-layer space of bentonite. Batch experiment results show that HDPy-bent could quantitatively remove TcO4− from aqueous solution within 3 min. The distribution coefficient (Kd) of TcO4− in this material is up to 2.1 × 105 mL/g, which is significantly higher than most of the previously tested inorganic adsorbent materials. More importantly, HDPy-bent can selectively remove TcO4− in the presence of large excess (80,000 times) of competitive anions (NO3–, SO42−, CO32−, PO43− and Cl−). This work demonstrates that the HDPy-bentonite is a low cost, and effective adsorbent for removing 99Tc from contaminated water.
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