光催化微反应器中水样光催化降解及Cd2+在线检测

doi:10.7517/j.issn.1674-0475.2016.05.444

影像科学与光化学 ›› 2016, Vol. 34 ›› Issue (5): 444-451.DOI: 10.7517/j.issn.1674-0475.2016.05.444

光催化微反应器中水样光催化降解及Cd²⁺在线检测

朱哲欣, 叶美英

杭州师范大学材料与化学化工学院, 浙江杭州 310036

收稿日期:2016-07-28 修回日期:2016-08-12 出版日期:2016-09-15 发布日期:2016-09-15
通讯作者: 叶美英
基金资助:
国家自然科学基金项目（21407039）资助

Photocatalytic Degradation of Water Sample and On-line Monitoring of Cd²⁺ in Microreactor

ZHU Zhexin, YE Meiying

Department of Chemistry, University of Hangzhou Normal University, Hangzhou 310036, Zhejiang, P. R. China

Received:2016-07-28 Revised:2016-08-12 Online:2016-09-15 Published:2016-09-15

摘要/Abstract

摘要：

本文以粉末法制备TiO₂涂层的玻璃微流控芯片作为光催化反应器，采用UV-LED点光源为紫外光源，实现了水样中EDTA的光催化降解，并用铋膜电极差分脉冲溶出伏安法在线检测微量水样中的重金属离子Cd²⁺。水样中的Cd²⁺由于EDTA的络合作用无法在铋膜电极上产生电流信号，而当水样在光催化微反应器中经紫外光催化后，由于EDTA与Cd²⁺的配合物结构遭破坏，因此释放出游离的Cd²⁺，从而使Cd²⁺的电流信号得到一定程度的恢复。Cd²⁺的电流恢复程度越大，表明EDTA被光催化降解的程度越高。本文考察了光照强度、反应液流速和氧气流速、pH等因素对EDTA光催化降解效率的影响。在光照强度为120 mW/cm²、反应液流速为50 μL/h、氧气流速为850 μL/h、pH为4.4条件下，水样中EDTA的光催化降解率效果最佳，水样中Cd²⁺的电流恢复程度可达92.6%。反应液流速为300 μL/h时，Cd²⁺的电流恢复率为60.0%，重复光催化反应5次的RSD为5.2%，具有较好的重现性。本文建立了水样EDTA光催化降解及Cd²⁺在线检测的微分析系统，在线检测所需的样品体积仅为0.3 mL，完成一个水样分析的时间约为60 min。

关键词: 光催化微反应器, EDTA降解, Cd²⁺, 在线检测

Abstract:

In this paper, a micro-analysis system integrated pretreatment of water sample by photocatalysis of organic matter with on-line monitoring of Cd²⁺ is established. Aphotocatalytic microreactor based on microfluidic chip coated with TiO₂ filmhas been fabricated and integrated with electrochemical detection system. The Cd-EDTA complex served as model system to demonstrate the on-line photocatalytic degradation of organic matter followed by the differential pulse stripping voltammetric determination of the metal ion in aqueous solution. The voltammetric signal of 0.1 mg/L Cd²⁺ in acetate buffer (pH 4.4) at the Bismuth Film Electrode is suppressed by EDTA. While irradiating the TiO₂-coated microfluidic chip with UV-LED at 365 nm causes the recovery of the Cd²⁺ signal, indicating the photocatalyticdegradation of EDTA.The effects of UV light intensity,flow rate,flow rate of oxygen and other factors on the photocatalytic degradation efficiency have been studied.Under the optimal condition of light intensity being 120 mW/cm², pH 4.4,flow rate of oxygen being 850 μL/h and the flow rate of water sample being 50 μL/h, the recovery of the Cd²⁺ signal rate up to 92.6%. When the flow rate of water sample is 300 μL/h, the recovery of the Cd²⁺ signal is 60.0%, and the RSD of the recovery of the Cd²⁺ signal is 5.2%. The sample volume needed for the electrochemical detection of Cd²⁺ is only 0.3 mL.The total analysis time for one measurement is about 60 min.

Key words: photocatalitic microreactor, degradation of EDTA, Cd²⁺, on-line detection

朱哲欣, 叶美英. 光催化微反应器中水样光催化降解及Cd²⁺在线检测[J]. 影像科学与光化学, 2016, 34(5): 444-451.

ZHU Zhexin, YE Meiying. Photocatalytic Degradation of Water Sample and On-line Monitoring of Cd²⁺ in Microreactor[J]. Imaging Science and Photochemistry, 2016, 34(5): 444-451.

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光催化微反应器中水样光催化降解及Cd²⁺在线检测

Photocatalytic Degradation of Water Sample and On-line Monitoring of Cd²⁺ in Microreactor

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