NDLI: Degradation of metaldehyde in water by nanoparticle catalysts and powdered activated carbon

Content Provider	Springer Nature Link
Author	Li, Zhuojun Kim, Jong Kyu Chaudhari, Vrushali Mayadevi, Suseeladevi Campos, Luiza C.
Copyright Year	2017
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$^{−1}$) 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 $_{ m }$ (maximum/saturation adsorption capacity) value of 32.258 mg g$^{−1}$ and a K $_{ L }$ (Langmuir constant) value of 2.013 L mg$^{−1}$. In terms of kinetic study, adsorption of metaldehyde by PAC fitted well with a pseudo-second-order equation, giving the adsorption rate constant k $_{2}$ value of 0.023 g mg$^{−1}$ min$^{−1}$, implying rapid adsorption. The nanocatalysts were much less effective in oxidising metaldehyde than PAC with the same metaldehyde concentration and 0.2 g L$^{−1}$ 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. Graphical abstract ᅟ
Starting Page	17861
Ending Page	17873
Page Count	13
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	24
Issue Number	21
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-06-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metaldehyde Powdered activated carbon Photocatalysts Adsorption Photocatalysis Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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