UV-LED联合高碘酸盐高效降解废水中染料的技术探究  

Efficient degradation of common dyes by the combination of UV-LED and periodate

作　　者：徐亦琪 章钰 苏晗 牛丽君 冯明宝 XU Yiqi;ZHANG Yu;SU Han;NIU Lijun;FENG Mingbao(College of the Environment&Ecology,Xiamen University,Xiamen 361102,China)

机构地区：[1]厦门大学环境与生态学院,福建厦门361102

出　　处：《能源环境保护》2023年第4期91-99,共9页Energy Environmental Protection

基　　金：厦门大学校长研究基金(20720210081)。

摘　　要：针对有色染料在水中难以被天然降解或被传统污水处理工艺去除的问题,本研究开发了紫外发光二极管(UV-LED)联合高碘酸盐(PI)的高级氧化工艺,以去除水环境中有色染料。结果表明,该体系适用于较宽的pH范围,且当波长约为270 nm、PI浓度为1 mmol/L时降解效能最优;环境中NO_(3)^(-)和HCO_(3)^(-)对染料去除表现出抑制作用,而Cl^(-)、SO_(4)^(2-)和天然腐植酸对体系影响较小。通过淬灭实验和电子顺磁共振实验证实,UV-LED/PI体系降解污染物的主要活性物质为羟基自由基(·OH)和单线态氧(^(1)O_(2))。此外,探究亚甲基蓝(MB)在体系中的转化产物并提出反应路径,对MB及转化产物做多靶点毒性预测,发现转化产物生物可降解性显著提高,但仍然表现出一定的急慢性毒性。To address the issue that dyes are recalcitrant to hydrolysis and conventional water treatment strategies,an ultraviolet light-emitting diode(UV-LED)/periodate(PI)advanced oxidation process was developed for dye removal.The results showed that this system was applicable to a wide pH range.The dyes were completely removed in 40 minutes optimally with 270 nm UV-LED and 1 mmol/L PI.NO_(3)^(-) and HCO_(3)^(-) showed inhibitory effects on dye decomposition,while Cl^(-),SO_(4)^(2-) and humic acid had a negligible effect on the system.Quenching experiments and electron paramagnetic resonance experiments were conducted to explore the reactive species involved in the oxidation process.It was confirmed that hydroxyl radicals and singlet oxygen dominated the degradation of pollutants.In addition,the transformation products of methylene blue(MB)in the system were explored and the potential reaction pathway was proposed.Furthermore,the toxicity of MB and the transformation products were predicted via a series of in silico QSAR-based prediction approaches.It was found that the biodegradability of the transformed products was significantly improved.However,some products still exhibited acute/chronic toxicity.

关 键 词：染料 紫外发光二极管 高碘酸盐 机理探究 毒性预测 

分 类 号：X703[环境科学与工程—环境工程]