Catalyzed Degradation of Azo Dyes under Ambient Conditions
Catalyzed Degradation of Azo Dyes under Ambient Conditions
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DOI：
10.1021/es1027234
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发表时间：
2010-12-01
影响因子：
11.4
通讯作者：
Wen, Wei
中科院分区：
文献类型：
--
作者：
Wu, Jin-Ming;Wen, Wei
采用溶液燃烧法合成了纯相层状钙钛矿La₄Ni₃O₁₀粉末。研究发现，在La₄Ni₃O₁₀粉末存在的情况下，偶氮染料水溶液在环境条件下能够高效地被催化降解。该催化反应既不需要光照，也不需要额外的试剂。通过磁力搅拌可显著加快染料降解过程。一系列系统的化学和电化学实验表明，染料降解是通过电子从染料分子转移到催化剂，然后再转移到电子受体（如溶解氧）而进行的。目前这种催化降解不需要额外的试剂或外部能量输入，因此为偶氮染料废水的修复提供了一种潜在的低成本替代方法。
Phase-pure layered perovskite La(4)Ni(3)O(10) powders were synthesized by a solution combustion approach. It is found that, in the presence of the La(4)Ni(3)O(10) powders, aqueous azo dyes can be degraded catalytically and efficiently under ambient conditions. Neither light nor additional reagents are needed in the catalytic reaction. The dye degradation procedure can be accelerated markedly by magnetic stirring. A systemic series of chemical and electrochemical experiments suggested that the dye degradation proceeds through electron transfers from the dye molecules to the catalyst and then to electron acceptors such as dissolved oxygen. The present catalytic degradation requires no additional reagents or external energy input, which hence provides a potentially low-cost alternative for the remediation of azo-dye effluents.