Use of Biopolymeric Membranes for Adsorption of Paraquat Herbicide from Water

Cocenza, Daniela Sgarbi; Moraes, Mariana Agostini de; Beppu, Marisa Masumi; Fraceto, Leonardo Fernandes

doi:10.1007/s11270-012-1092-x

Cited by 38 publications

(22 citation statements)

References 45 publications

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“…Recently, various wastewater treatment processes have been reported in the literature so as to eliminate paraquat contaminated in water such as physical methods (adsorption [14], filtration [15,16] and ion-exchange [17,18]), chemical methods (extraction [19], photocatalytic degradation [20,21], oxidation [22,23] and electrochemical process [24]) and biological method (fungi decomposition [25]). Among the methods mentioned above, the adsorption process demonstrates a simplicity of operation, a low-cost process and a high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Among the methods mentioned above, the adsorption process demonstrates a simplicity of operation, a low-cost process and a high efficiency. Up to now, several adsorbents have been prepared to remove paraquat from aqueous solution: activated carbon [12] [26], biochar [27], membrane based on chitosan and alginate [16], activated bleaching earth [28], goethite [29,30], clays [31], rice husk [32], phillipsite-faujasite tuff [33], bentonite [34], graphene oxide nanocomposite [35], multi-walled carbon nanotubes [36], silica [37,38], faujasite zeolite [39], iron oxide coated quartz particles [40], pillararene based porous polymer [41] and magnetic hybrid nanosorbent [42].…”

Section: Introductionmentioning

confidence: 99%

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Removal of paraquat herbicide from water by textile coated with anionic cyclodextrin polymer

et al. 2018

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The coating of anionic cyclodextrin polymer on polyethylene terephthalate (PET) textile was achieved by crosslinking between β-cyclodextrin (β-CD) and citric acid (CTR) to adsorb paraquat herbicide from aqueous solution. This coating performance (30 min, 170 °C) was 22.18% of weight gain which was corresponded to 0.51 mmol/g of ion exchange capacity (IEC). Then, the samples were characterized by scanning electron microscopy (SEM), attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) and thermogravimetric analysis (TGA). The appropriated pH was 6.5 and the equilibrium time was 420 min. At 30 °C, the adsorption capacity towards paraquat (PQ) was enhanced (4.5, 18.9 and 23.7 mg/g) when the initial concentration of paraquat was increased (10, 50 and 250 mg/L). The adsorption kinetics was fitted to the pseudo-second-order model and the adsorption isotherm was suitable to Langmuir model. For the thermodynamic studies, the negative ∆G° revealed a spontaneous process, the negative ∆H° showed an exothermic process and the positive ∆S° displayed an enhanced disorder. Finally, the reusability of functionalized textile in methanol was reached 78.6% after six regeneration cycles and the stability of sample in various solvents was also studied. Graphical abstract Anionic cyclodextrin polymer coated on PET textile issued from the crosslinking between β-cyclodextrin and citric acid was used as an efficient adsorbent for paraquat removal from aqueous solution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of paraquat herbicide from water by textile coated with anionic cyclodextrin polymer

et al. 2018

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“…In the present study, the effects of a model substance, the herbicide Paraquat, on honey bee development have been examined by exposing the brood to very low concentrations of Paraquat in food. Although Paraquat was banned from the European Union in 2007 and in other countries, it is still used, at field rate of 0.3–2 kg/ha, on more than 100 crops in about 100 countries and particularly in developing countries [24]. Paraquat was shown to be non-toxic to slightly toxic to adult bees [25], [26].…”

Section: Introductionmentioning

confidence: 99%

Size Changes in Honey Bee Larvae Oenocytes Induced by Exposure to Paraquat at Very Low Concentrations

et al. 2013

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The effects of the herbicide Paraquat were investigated in honey bee larvae with attention focused on oenocytes. Honey bee larvae were exposed to Paraquat at different concentrations in the food: 0, 0.001, 0.01, 0.1 and 1 µg/kg. In controls, between 24 h and 48 h, oenocytes grew from 630.1 to 1643.8 µm2 while nuclei changed in size from 124.9 to 245.6 µm2. At 24 h, Paraquat induced a slight decrease in the size of oenocytes and nuclei. N-acetylcysteine (NAC), an antioxidant substance, slightly lowered the effects of Paraquat. At 48 h, Paraquat elicited a strong concentration-dependent decrease in the size of oenocytes, even at the lowest concentration. NAC reversed the effect of Paraquat at a concentration of ≥0.01 µg/kg. This reversion suggested different modes of action of Paraquat, with an oxidant action prevalent at concentrations ≥0.01 µg/kg. This study is the first which reports an effect of a pesticide at the very low concentration of 1 ng/kg, a concentration below the detection limits of the most efficient analytic methods. It shows that chemicals, including pesticides, are likely to have a potential impact at such exposure levels. We also suggest that Paraquat could be used as a suitable tool for investigating the functions of oenocytes.

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“…Membrane Processes. Cocenza et al (2012) examined the ability of bio-polymeric membranes prepared with alginate and chitosan to adsorb paraquat from water.…”

Section: Toxicologymentioning

confidence: 99%