Novel activation of persulfate by its intercalation into Mg/Al-layered double hydroxide: Enhancement of non-radical oxidation
Novel activation of persulfate by its intercalation into Mg/Al-layered double hydroxide: Enhancement of non-radical oxidation
复制标题
通过嵌入镁/铝层状双氢氧化物来新型活化过硫酸盐：增强非自由基氧化
DOI：
10.1016/j.cej.2017.06.067
复制
发表时间：
2017-11
影响因子：
15.1
通讯作者：
Qian Guangren
中科院分区：
文献类型：
--
作者：
Huang Xin;Su Man;Zhou Jizhi;Shu Weikang;Huang Zhifeng;Gao Naiyun;Qian Guangren
基于过硫酸盐的高级氧化过程已经被很好地研究，通过各种活化方法产生自由基物质。本研究报告了一种不产生自由基的过二硫酸盐（S2 O 82-，PDS）的活化途径，通过将PDS插入Mg/Al层状双氢氧化物（LDH）中实现。物理表征表明，PDS插层了LDH，层间距增加到0.917 nm。含0.4 mmol/g PDS的LDH-PDS复合物对苯酚的降解率约为93.9%，而含PDS的对照组对苯酚的去除率为0.此外，PDS衰变产生的硫酸盐可能保留在LDH层中，因为没有观察到硫酸盐泄漏到溶液中。这与反应后LDH-PDS的FT-IR光谱中出现硫酸根特征峰相一致。有趣的是，在氧化过程中，自由基没有记录的电子自旋共振测量或自由基清除剂测试。PDS的反应活性可能是通过LDH层压板上的碱性位点来提高的，这些碱性位点提供了OH来活化PDS中的O单键O键。此外，LDH层的有限空间减少了插层PDS的键断裂，从而减少了自由基的产生。因此，本研究结果提出了苯酚与PDS在LDH层间发生非自由基反应的可能性，并为PDS清除有机污染物提供了一条新的活化途径。
Persulfate based advanced oxidation processes have been well investigated, with the generation of radical species via various activation methods. This study reports an activation pathway of peroxydisulfate (S2O82−, PDS) without radical production, achieved by the intercalation of PDS into Mg/Al-layered double hydroxide (LDH). Physical characterization indicated that the LDH was intercalated by PDS with the interlayer distance increasing to 0.917 nm. Approximately 93.9% of the phenol was decomposed by a LDH-PDS composite containing 0.4 mmol/g PDS, whilst no removal of phenol was achieved in the control group with PDS. Moreover, sulfate from decay of PDS was likely kept in the layers of LDH for no sulfate leakage in solution was observed. This is in accordance with the occurrence of characteristic peaks assigned for sulfate in FT-IR spectrum of LDH-PDS after reaction. Interestingly, radicals were not recorded by electron spin resonance measurement or radical scavenger tests during the oxidation process. The reactivity of PDS was likely improved by the basic sites on the LDH laminate, which provided OH to activate the Osingle bondO bond in PDS. Further, the limited space of LDH layers reduce the bond cleavage of intercalated PDS and thus the generation of radicals. Therefore, the results proposed a non-radical reaction between phenol and PDS in the interlayer of LDH and developed a novel activation pathway for PDS in the elimination of organic contaminants.
登录
查看更多内容
DOI：
10.1039/jr9480002303
发表时间：
1948
期刊：
Journal of The Chemical Society (resumed)
影响因子：
--
作者：
W. Baker;N. Brown
通讯作者：
W. Baker;N. Brown
影响因子：
11.4
作者：
Tao Zhang;Yin Chen;Yuru Wang;Julien Le Roux;Yang Yang-Yang;J. Croué
通讯作者：
Tao Zhang;Yin Chen;Yuru Wang;Julien Le Roux;Yang Yang-Yang;J. Croué
影响因子：
8.8
作者：
Graham, N;Jiang, CC;Ma, J
通讯作者：
Ma, J
水中磺胺二甲嗪的紫外线 (UV) 光激活过硫酸盐氧化
影响因子：
15.1
作者：
Gao, Yu-qiong;Gao, Nai-yun;Ma, Yan
通讯作者：
Ma, Yan
DOI：
10.1002/chin.200123233
发表时间：
2000-03
期刊：
Catalysis Surveys from Japan
影响因子：
--
作者：
K. Kaneda;K. Yamaguchi;K. Mori;T. Mizugaki;K. Ebitani
通讯作者：
K. Kaneda;K. Yamaguchi;K. Mori;T. Mizugaki;K. Ebitani