Effect of Different Wood Pretreatments on the Sorption−Desorption of Linuron and Metalaxyl by Woods

Abstract

The sorption-desorption of two different pesticides, linuron and metalaxyl, by woods was studied. Sorbent/solution ratio and sorption kinetics were also determined. Untreated wood and water, NaOH, HCl, and octadecyltrimethylammonium bromide (ODTMA) treated pine (softwood) and oak (hardwood) were used as sorbents. Linuron and metalaxyl were sorbed by untreated woods up to 80 and 40%, respectively, in a short time when the sorbent/solution ratio of 1:10 was used. Sorption of pesticides was significantly higher by pine, having higher lignin content, than by oak. Freundlich sorption constants (K(f)) were 96.2 and 74.4 (linuron) and 8.28 and 4.95 (metalaxyl) for untreated pine and oak woods and increased 1.04-2.35-fold (linuron) and 1.33-2.17-fold (metalaxyl) when woods were treated. The sorption was higher by HCl- and ODTMA-treated woods. Additionally, Freundlich desorption constants also indicated greater sorption irreversibility of both pesticides for treated woods than for untreated woods. The results revealed wood residues as a promising, low-cost, and environmentally friendly material to immobilize pesticides in soils, preventing water contamination. Wood treatments aimed at removing soluble wood extracts or at modifying wood chemical structure could increase their sorption capacity.

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

“…Recent literature reports several studies on the effective adsorption of many organic compounds such as pesticides [153,154,271,[282][283][284][285][286][287][288][289], phenolic compounds [290][291][292][293][294][295], dyes [144,[296][297][298][299][300][301], PAHs [302,303], explosives [304] and pharmaceuticals and hormonal compounds [85,[305][306][307] by a variety of adsorbents prepared from agricultural wastes. The list of materials that have been tested in such studies is long (and still increasing).…”

“…The list of materials that have been tested in such studies is long (and still increasing). Some examples include pine bark [282,283,302,304,305], almond shells [292,307], banana peels [284,293], sawdust [153,285,300], coconut fibers [285], rice bran [271,287], rice husk [271,287], moringa pods [271], hazelnut shells [299,300], wood residues [286], cork wastes [85,153,154,289,295,303,306] and chickpea husk [288]. In addition, assays have also been conducted with some of these materials after submitting them to more or less complex treatments (usually thermal), e.g.…”

“…In addition, assays have also been conducted with some of these materials after submitting them to more or less complex treatments (usually thermal), e.g. chemically modified pine bark [302], almond shell ashes [307], almond shell charcoal [292], walnut shell charcoal [292], wood charcoal [285], coconut shell activated carbon [294], coconut charcoal [285], bagasse charcoal [285], bagasse fly ash [269,271] and chemically treated wood residues [286].…”

Physicochemical Study of the Sorption of Pesticides by Wood Components

“…Combining the data of pesticides with a wider range of K ow (3–1.61) and solubility (81–8400 mg L −1 ) from Torrents et al (1997) and from our study, we obtained a model for the prediction of K foc according to the following equation: The r 2 coefficient explained 90% of the variability of K foc and hardly increased when the solubility was included as a variable for the model, as reported by Torrents et al (1997) Validation of this model with data of linuron and metalaxyl sorption by untreated and treated woods with different PI (Rodríguez‐Cruz et al, 2008) revealed a significant correlation ( r = 0.83; p < 0.001) and pointed out that the application of this equation to real wood data should be further explored.…”

Sorption of Denatonium to Kaolinite Clay from Water

“…Industrially, paper and pulp wastewater are treated with QAC-functionalized molecular sieves to remove dyes [4]; waters contaminated with pesticides (i.e. linuron) are cleaned via sorption to QAC treated wood [8] or sorption to QAC treated soils [9]. Anticholinergic drugs also utilize QACs as active ingredients [10].…”