Perchlorate degradation in aqueous solution using chitosan-stabilized zero-valent iron nanoparticles
Perchlorate degradation in aqueous solution using chitosan-stabilized zero-valent iron nanoparticles
复制标题
使用壳聚糖稳定的零价铁纳米颗粒降解水溶液中的高氯酸盐
DOI：
10.1016/j.seppur.2016.07.023
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发表时间：
2016-10-17
影响因子：
8.6
通讯作者：
Xu, Mo
中科院分区：
文献类型：
--
作者：
Xie, Yanhua;Yi, Yan;Xu, Mo
作为一种新出现的污染物，高氯酸盐在世界各地的地下水、地表水、土壤和食物中都被检测到。高氯酸盐具有良好的溶解性和化学稳定性，因此其在水中的降解具有挑战性。合成了壳聚糖稳定的纳米零价铁(CS-nZVI)，并研究了其对水中高氯酸盐的降解性能。壳聚糖可改善nZVI的分散性能，从而提高其反应性。与ZVI和nZVI相比，CS-nZVI对高氯酸盐的去除效果更好、速度更快。CS-nZVI对高氯酸盐具有很好的降解效果，尤其在高浓度(与L 200mg1)的高氯酸盐污染水中表现出更好的降解效果。初始溶液pH(3-11)和盐度(0.1-30g L-1)对CS-NZVI反应8h后的高氯酸盐降解没有显著影响。升高温度可以提高高氯酸盐的去除效率，在初始高氯酸盐浓度为10 mg L-1的条件下，在92℃时，高氯酸盐的去除效率可达96.1%。该反应的活化能(E-a)较低，为41.55+/-1.93kJ·mol(-1)，低于其他相关研究。CS-nZVI对四氯酸根的降解是通过初始吸附和后续还原的相互作用完成的。反应8h后，大部分高氯酸盐(>；73%)在较高的反应温度(>；85℃)下完全还原为氯化物，几乎没有副产物。因此，本研究为高浓度或高盐度污染水中高氯酸盐的降解提供了一种有效的方法。(C)2016爱思唯尔B.V.保留所有权利。
As an emerging contaminant, perchlorate has been detected in groundwater, surface water, soil and food worldwide. Perchlorate has good solubility and chemical stability, thus its degradation in water is challenging. Chitosan-stabilized nano Zero-valent Iron (CS-nZVI) was synthesized and tested to degrade perchlorate in water. Chitosan could improve the dispersive property of nZVI, and thus improve its reactivity. Compared with ZVI and nZVI, CS-nZVI exhibited better and faster removal of perchlorate. CS-nZVI exhibited excellent degradation of perchlorate, especially in high-concentration (similar to 200 mg L-1) perchlorate polluted water. The initial solution pH (3-11) and salinity (0.1-30 g L-1) of the solution did not have a significant influence on perchlorate degradation by CS-nZVI after 8 h reaction. Increasing the temperature could enhance the removal efficiency of perchlorate, and the removal rate reached to 96.1% at 92 degrees C with the initial perchlorate of 10 mg L-1. A low activation energy (E-a) of 41.55 +/- 1.93 kJ mol(-1) in the reaction was observed, which was lower than that in other relevant studies. The degradation of per chlorate by CS-nZVI was completed by the interaction of initial adsorption and subsequent reduction. After 8 h reaction, most of the perchlorate (>73%) was completely reduced to chloride with very little byproduct at relatively high reaction temperatures (>85 degrees C). Therefore, this research provides an effective method for perchlorate degradation in contaminated water with high concentrations or high salinity. (C) 2016 Elsevier B.V. All rights reserved.