Constituting Fully Integrated Visual Analysis System for Cu(II) on TiO sub( 2)/Cellulose Paper

• Published in: Analytical chemistry (Washington) Vol. 86; no. 14; p. 7079
• Main Authors: Li, Shun-Xing, Lin, Xiaofeng, Zheng, Feng-Ying, Liang, Wenjie, Zhong, Yanxue, Cai, Jiabai
• Format: Journal Article
• Language: English
• Published: 01.07.2014
• Subjects: Adsorption; Cellulose; Colorimetry; Nanostructure; TCP (protocol); Titanium dioxide; Visual
• ISSN: 0003-2700

As a cheap and abundant porous material, cellulose filter paper was used to immobilize nano-TiO sub( 2) and denoted as TiO sub( 2)/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 degree 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-linear calibration curve for Cu(II) was in the range of 0.5-50.0 mu g L super( -1) with a determination coefficient (R6sup 2] of 0.985 and its detection limit was 0.073 mu g L super( -1) .