Application of Natural Lignocellulosic Materials as Adsorbents for Organic Pollutants

3 Application of Natural Lignocellulosic Materials as Adsorbents for Organic Pollutants 

Adachi et al. [13] suggested that the use of beer bran as an adsorbent is an efficient and cost-effective method to remove several organic compounds such 

In a study achieved by Memon et al. [16] the sorption of carbofuran and methyl parathion on treated and untreated chestnut shells has been studied using high performance liquid chromatography. In this study, the maximum sorption of methyl parathion and carbofuran onto chestnut shells was achieved at a concentration of 0.38.10 and 0.45.10 mol.dm respectively. Adsorption isotherms depicted a better fitting with the Langmuir isotherm. The results of sorption energy obtained from the Dubinin-Radushkevich isotherm pointed out that adsorption was driven by physical interactions. The kinetics of sorption follows a first-order rate equation. The thermodynamic parameters AS and AG indicate that the sorption process is thermodynamically favourable, and spontaneous, whereas the value of AH shows the exothermic nature of sorption process for methyl parathion and endothermic nature of carbofuran. The developed sorption method has been employed in methyl parathion and carbofuran in real surface and ground water samples. The sorbed amount of methyl parathion and carbofuran may be removed by methanol to the extent of 97-99% from the surface of chestnut shells. 

Le Bourvelleca et al. [17] have investigated the sorption of procyanidins, a polyphenol tannin derivative, on native cellulose fibers and other polysaccharide substrates such as modified pectin and xyloglucan and starch. Through this study, they showed a relatively low affinity of the substrate towards the tested chemical which presented a low adsorbed around 4 mg.g.  

The sorption of aromatic compounds on cyclodextrin-EPI copolymer has been developed by Yu et al. [18]. They found that this copolymer has high extraction efficiency with recoveries between 90 and 100% for aromatic compounds. Other highly crosslinked cyclodextrin-EPI copolymer has been tested for the adsorption of bisphenol A and more than 98% was removed [19]. 

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