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- Title
Degradation of metaldehyde in water by nanoparticle catalysts and powdered activated carbon.
- Authors
Li, Zhuojun; Campos, Luiza; Kim, Jong; Chaudhari, Vrushali; Mayadevi, Suseeladevi
- Abstract
Metaldehyde, an organic pesticide widely used in the UK, has been detected in drinking water in the UK with a low concentration (<1 μg L) which is still above the European and UK standard requirements. This paper investigates the efficiency of four materials: powdered activated carbon (PAC) and carbon-doped titanium dioxide nanocatalyst with different concentrations of carbon (C-1.5, C-40, and C-80) for metaldehyde removal from aqueous solutions by adsorption and oxidation via photocatalysis. PAC was found to be the most effective material which showed almost over 90% removal. Adsorption data were well fitted to the Langmuir isotherm model, giving a q (maximum/saturation adsorption capacity) value of 32.258 mg g and a K (Langmuir constant) value of 2.013 L mg. In terms of kinetic study, adsorption of metaldehyde by PAC fitted well with a pseudo-second-order equation, giving the adsorption rate constant k value of 0.023 g mg min, implying rapid adsorption. The nanocatalysts were much less effective in oxidising metaldehyde than PAC with the same metaldehyde concentration and 0.2 g L loading concentration of materials under UV light; the maximum removal achieved by carbon-doped titanium dioxide (C-1.5) nanocatalyst was around 15% for a 7.5 ppm metaldehyde solution.
- Subjects
METALDEHYDE; WATER purification; NANOPARTICLES; ACTIVATED carbon; PHOTOCATALYSTS; ADSORPTION (Chemistry); TITANIUM dioxide; PESTICIDE content of water
- Publication
Environmental Science & Pollution Research, 2017, Vol 24, Issue 21, p17861
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-017-9249-1