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紫外波长对UV/Cl<sub>2</sub>高级氧化去除水中有机物的影响
Effect of Ultraviolet Wavelength on Removal of Organic Matter in Water by Advanced Oxidation of UV/Cl<sub>2</sub>
投稿时间:2018-09-23  修订日期:2018-12-21
DOI:
中文关键词:  波长  发光二极管LED  UV/Cl2高级氧化  自由基  甲酸  水杨酸
英文关键词:wavelength  light-emitting diode (LED)  UV/Cl2 advanced oxidation  free radical  formic acid  salicylic acid  tannic acid
基金项目:
作者单位E-mail
喻杰 清华大学环境学院 yujie16@mails.tsinghua.edu.cn 
叶志伟 北京林业大学环境科学与工程学院  
党文悦 北京林业大学环境科学与工程学院  
杨宏伟 清华大学环境学院 yanghw@tsinghua.edu.cn 
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中文摘要:
      为明确紫外波长对UV/Cl2高级氧化体系的影响,使用中心波长分别为267 nm、275 nm、286 nm的发光二极管LED作为光源,探究Cl2光解动力学、UV/Cl2体系自由基生成、对模式化合物溶液以及天然水、再生水TOC的去除。在中性或酸性体系中,267 nm最接近HClO最大吸收波长237 nm,吸光度和量子产率均较大,羟基自由基产生水平较高,有机物去除效果较好;碱性体系中,286 nm最接近ClO-最大吸收波长292 nm,尽管量子产率较小,但吸光度很大,有机物去除效果较好;由于水杨酸在292 nm附近有较强的竞争吸收,使用UV286去除水杨酸效果被削弱。应用UV/Cl2技术选择波长时需要考虑吸光度、量子产率、竞争吸收等因素。对于弱碱性天然水或再生水,采用波长为292 nm的紫外光一般可获得较优处理效果。
英文摘要:
      To investigate the effect of ultraviolet wavelength on the UV/Cl2 advanced oxidation system, the photolysis kinetics of Cl2, the generation of free radicals in UV/Cl2 system, the removal of TOC from model compound solutions, natural water and reclaimed water, were investigated by using LEDs as ultraviolet light sources with central wavelengths of 267 nm, 275 nm and 286 nm, respectively. The results showed that in neutral or acidic condition, since 267 nm is closest to maximum absorption wavelength of HClO (237 nm), the absorbance and quantum yield of chlorine with UV267 are both larger, leading to higher level of hydroxyl radicals and higher removal of organic matter. In alkaline condition, since 286 nm is closest to maximum absorption wavelength of ClO- (292 nm), although the quantum yield with UV286 is lower, the absorbance of chlorine is considerably high, resulting in higher removal of organic matter. In addition, it is inefficient to remove salicylic acid by using UV286, due to the strong competitive absorption of the acid near 292 nm. It is suggested to consider absorbance, quantum yield and competitive absorption when choosing the appropriate UV light wavelength for the practical application of UV/Cl2. Generally, using UV light with the wavelength of 292 nm is suitable for the UV/Cl2 treatment of weakly alkaline natural or reclaimed water.
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