Constituting Fully Integrated Visual Analysis System for Cu(II) on TiO2/Cellulose Paper

详细信息    查看全文

• 作者：Shun-Xing Li ; Xiaofeng Lin ; Feng-Ying Zheng ; Wenjie Liang ; Yanxue Zhong ; Jiabai Cai
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：July 15, 2014
• 年：2014
• 卷：86
• 期：14
• 页码：7079-7083
• 全文大小：305K
• ISSN：1520-6882

文摘

As a cheap and abundant porous material, cellulose filter paper was used to immobilize nano-TiO₂ and denoted as TiO₂/cellulose paper (TCP). With high adsorption capacity for Cu(II) (more than 1.65 mg), TCP was used as an adsorbent, photocatalyst, and colorimetric sensor at the same time. Under the optimum adsorption conditions, i.e., pH 6.5 and 25 掳C, the adsorption ratio of Cu(II) was higher than 96.1%. Humic substances from the matrix could be enriched onto TCP but the interference of their colors on colorimetric detection could be eliminated by the photodegradation. In the presence of hydroxylamine, neocuproine, as a selective indicator, was added onto TCP, and a visual color change from white to orange was generated. The concentration of Cu(II) was quantified by the color intensity images using image processing software. This fully integrated visual analysis system was successfully applied for the detection of Cu(II) in 10.0 L of drinking water and seawater with a preconcentration factor of 10⁴. The log鈥搇inear calibration curve for Cu(II) was in the range of 0.5鈥?0.0 渭g L^鈥? with a determination coefficient (R²) of 0.985 and its detection limit was 0.073 渭g L^鈥?.