A two-step strategy for high-efficiency fluorescent dye removal from wastewater
A two-step strategy for high-efficiency fluorescent dye removal from wastewater
复制标题
从废水中高效去除荧光染料的两步策略
DOI：
10.1038/s41545-019-0041-2
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发表时间：
2019-09-03
期刊：
影响因子：
11.4
通讯作者：
Li, Xiaochun
中科院分区：
文献类型：
--
作者：
Gui, Wanyuan;Lin, Junpin;Li, Xiaochun
传统的循环活性污泥法(CASS)耗时(72h)、耗能大，极大地限制了其应用。虽然先进的氧化技术(如光催化、光电催化、UV/中心点OH和电芬顿)可以将处理时间缩短几个小时，但由于电子和空穴的缓慢产生和快速耦合，导致降解效率较低。在这项工作中，开发了一种使用两步策略的完整路线，可以在几分钟内从废水中去除有机染料。通过电解放电等离子体(EDP)结合核壳结构的Au@SiO_2纳米催化剂降解废水中的[罗丹明(RhB)/曙黄(EY)]染料，电子和空穴呈现出“快产生、慢耦合”的新技术。结果表明，EDP与Au@SiO_2纳米催化剂的协同作用增强了降解动力学，在50~1.5 mg/L的浓度范围内对不同浓度的RhB和EY染料有较好的降解效果。基于化学需氧量(COD)和相对去除效率，进一步确定了两步法的有利贡献。这种分两步走的策略为工业废水处理提供了一种前所未有的快速方法。
Conventional circulating activated sludge techniques (CASS) are time consuming (72 h) and energy intensive, all of which greatly limits their use. Although advanced oxidation techniques (e.g., photocatalysis, photoelectrocatalysis UV/center dot OH, and Electro-Fenton) can reduce the treatment time by several hours, the slow generation and fast coupling of electron and hole make the low degradation efficiency. In this work, an intact route using a two-step strategy is developed to eliminate organic dyes from wastewater in only a few minutes. The electron and hole exhibit "fast generation and slow coupling" by using the new technique via electrolytic discharge plasma (EDP) combined with a core-shell structure Au@SiO2 nanocatalyst for [Rhodamine (RhB)/Eosin yellowish (EY)] dyes degradation in wastewater. Results demonstrate that the synergy of EDP and Au@SiO2 nanocatalyst enhances degradation kinetics, and it is effective in degrading different concentrations of RhB and EY dyes in the range of 50-1.5 mg/L. Then, the Au@SiO2 nanocatalyst (over 99%) and carbon impurities are filtered by a porous nanocomposite ultrafiltration membrane. Favorable contributions of the two-step strategy are further ascertained based on chemical oxygen demand (COD) and relative removal efficiency. This two-step strategy provides an unprecedented rapid approach for industrial wastewater treatment.