01968nas a2200181   4500008004100000245009600041210006900137260000800206300001600214490000700230520132000237100001601557700001901573700002401592700002601616700002201642856012201664       2017                        eng d00aDegradation of metaldehyde in water by nanoparticle catalysts and powdered activated carbon0 aDegradation of metaldehyde in water by nanoparticle catalysts an  cJUL  a17861-178730 v243 aMetaldehyde, an organic pesticide widely used in the UK, has been detected in drinking water in the UK with a low concentration (< 1 mu g 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.1 aLi, Zhuojun1 aKim, Jong, Kyu1 aChaudhari, Vrushali1 aMayadevi, Suseeladevi1 aCampos, Luiza, C.  uhttps://library.ncl.res.in/content/degradation-metaldehyde-water-nanoparticle-catalysts-and-powdered-activated-carbon01694nas a2200205   4500008004100000245011000041210006900151260001000220300001400230490000700244520096500251100001901216700002001235700001601255700002601271700001701297700001901314700002601333856012901359       2020                        eng d00aDegradation of metaldehyde in aqueous solution by nano-sized photocatalysts and granular activated carbon0 aDegradation of metaldehyde in aqueous solution by nanosized phot  cJuly   a4505-45080 v203 a<p>Metaldehyde has been detected in drinking water system in relatively high concentration exceeding European water quality standard. In order to address this problem, the aim of this project was to treat metaldehyde aqueous solution by advanced oxidation processes (AOPs) and granular activated carbon (GAC) column. Ten novel materials were tested for degradation rates of metaldehyde under ultraviolet light irradiation (UVC). For treatment of 1 mg/L metaldehyde solution by AOPs, the highest degradation rate is 16.59% under UVC light with the aid of nitrogen doped titanium dioxide coated graphene (NTiO2/Gr). Furthermore, 0.5 mg/L is the optimal concentration for degradation of metaldehyde with N-TiO2/Gr under UVC light. Apart from that, the lifetime of GAC column could be elongated on condition that metaldehyde has been treated by AOPs previously. Hence, combination of AOPs and GAC column is promising in treating water containing metaldehyde.</p>
1 aKim, Jong, Kyu1 aJiang, Tingting1 aLi, Zhoujun1 aMayadevi, Suseeladevi1 aBharat, Kale1 aJoo, Jin, Chul1 aCampos, Luiza, Cintra  uhttps://library.ncl.res.in/content/degradation-metaldehyde-aqueous-solution-nano-sized-photocatalysts-and-granular-activated