Hexadecylpyridinium (HDPy) modified bentonite for efficient and selective removal of Tc-99 from wastewater
Hexadecylpyridinium (HDPy) modified bentonite for efficient and selective removal of Tc-99 from wastewater
复制标题
十六烷基吡啶 (HDPy) 改性膨润土可有效、选择性地去除废水中的 Tc-99
DOI：
10.1016/j.cej.2019.122894
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发表时间：
2020
影响因子：
15.1
通讯作者：
Shi Weiqun
中科院分区：
文献类型：
--
作者：
Yang Junqiang;Shi Keliang;Gao Xiaoqing;Hou Xiaolin;Wu Wangsuo;Shi Weiqun
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 × 105y), 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 remove99Tc 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 × 105mL/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 removing99Tc from contaminated water.
