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613155 
Journal Article 
Oxidative degradation of non-ionic surfactant (TritonX-100) by chromium(VI) 
Manhas, MS; Kumar, P; Mohammed, F; Khan, Z 
2008 
Yes 
Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757 
320 
1-3 
240-246 
Abstract: Degradation of polyoxyethylene chain of non-ionic surfactant (TritonX-100) by chromium(VI) has been studied spectrophotometrically under different experimental conditions. The reaction rate bears a first-order dependence on the [Cr(VI)] under pseudo-first-order conditions, [TritonX-100]≫[Cr(VI)] in presence of 1.16moldm−3 perchloric acid. The observed rate constant (k obs) was 3.3×10−4 to 3.5×10−4 s−1 and the half-life (t 1/2) was 33–35min for chromium(VI). The effects of total [TritonX-100] and [H+] on the reaction rate were determined. Reducing nature of non-ionic TritonX-100 surfactant is found to be due to the presence of –OH group in the polyoxyethylene chain. It was observed that monomeric and non-ionic micelles of TritonX-100 were oxidized by chromium(VI). When [TritonX-100] was less than its critical micelle concentration (cmc) the k obs values increased from 0.76×10−4 to 1.5×10−4 s−1. As the [TritonX-100] was greater than the cmc, the k obs values increases from 2.1×10−4 to 8.2×10−4 s−1 in presence of constant [HClO4] (1.16moldm−3) at 40°C. A comparison was made of the oxidative degradation rates of TritonX-100 with different metal ion oxidants. The order of the effectiveness of different oxidants was as follows: permanganate>diperiodatoargentate(III)>chromium(VI)>cerium(IV). [Copyright 2008 Elsevier] Copyright of Colloids & Surfaces A: Phys. Eng. Asp. is the property of Elsevier Science Publishers B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 
CHROMIUM; SURFACE active agents; COLLOIDS; CHEMICAL kinetics 
IRIS
• Chromium VI
     Considered
          Excluded
               Other Not Pertinent