Insights into enhanced removal of U(VI) by melamine sponge supported sulfurized nanoscale zero-valent iron
Insights into enhanced removal of U(VI) by melamine sponge supported sulfurized nanoscale zero-valent iron
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三聚氰胺海绵负载硫化纳米零价铁增强去除 U(VI) 的见解
DOI：
10.1016/j.jclepro.2021.129662
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发表时间：
2021-12
影响因子：
11.1
通讯作者：
Shujun Yu
中科院分区：
文献类型：
--
作者：
Hao Tang;Shu Zhang;Hongwei Pang;Jiaqi Wang;Xiangxue Wang;Gang Song;Shujun Yu
放射性污染物一直是废水中的重中之重，寻找一种绿色高效的处理技术仍然是一个重大的挑战。本研究首次设计了一种新型的三聚氰胺海绵负载硫化纳米零价铁（MS@S-NZVI）高分散材料，用于有效捕集水环境中的U（VI）。由于MS具有良好的机械强度，在水中目标材料可以保持其原有的结构，这大大抑制了S-NZVI的聚集。通过SEM、XRD、FTIR、TGA和XPS等表征手段，证实了MS@S-NZVI的有效合成及其优异的结构性能。反应平衡时间小于1 h，最大吸附容量（pH = 5，298 K时为180 mg/g）较高，表明目标材料对U（VI）的吸附性能良好。此外，在不同水体中的进一步研究表明，MS@S-NZVI在模拟废水体系中具有显著的U（VI）去除率。MS@S-NZVI对U（VI）的去除过程可分为3条途径，吸附和还原是主要的反应机理。本研究为三聚氰胺海绵的利用提供了新的思路，并对S-NZVI在放射性核素去除中的实际应用进行了前景展望。
Radioactive pollutants have always been the top priority in wastewater, and searching a green and efficient treatment technology remains a significant challenge. In this study, a novel melamine sponge supported sulfurized nanoscale zero-valent iron (MS@S-NZVI) material with high dispersion was firstly designed to effectively capture U(VI) from water environment. The target material could retain its original structure in water due to the excellent mechanical strength of MS, which greatly inhibited the aggregation of S-NZVI. A series of characterization techniques, such as SEM, XRD, FTIR, TGA and XPS, had proved the effective synthesis and excellent structural properties of the MS@S-NZVI. The faster reaction equilibrium (<1 h) and higher maximum adsorption capacity (180 mg/g at pH = 5 and 298 K) exposed the perfect performance of target material in the elimination of U(VI). In addition, further researches in different water systems exhibited that MS@S-NZVI had a significant U(VI) removal rate in simulated wastewater systems. Finally, the removal process of MS@S-NZVI to U(VI) could be divided into three pathways through the XPS technique, adsorption and reduction were the main reaction mechanisms. This study provides a new insight into the utilization of melamine sponge and a prospect for the practical application of S-NZVI in the removal of radionuclide.
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影响因子：
8.7
作者：
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通讯作者：
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DOI：
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影响因子：
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作者：
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