Kinetic and morphology study of alginate-vineyard pruning waste biocomposite vs. non modified vineyard pruning waste for dye removal

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• 作者：Xanel Vecino¹ ; Rosa Devesa-Rey¹ ; ² ; Salvador Villagrasa³ ; Jose M. Cruz¹ ; Ana B. Moldes¹ ; ^{amoldes@uvigo.es" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Immobilized alginate-vineyard ; Dyes ; Kinetic studies ; Roughness ; Spherical shape
• 刊名：Journal of Environmental Sciences
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：38
• 期：Complete
• 页码：158-167
• 全文大小：1448 K

文摘

In this work a comparative bioadsorption study between a biocomposite consisting of hydrolysed vineyard pruning waste entrapped in calcium alginate spheres and non entrapped vineyard residue was carried out. Results have demonstrated that the biocomposite based on lignocellulose-calcium alginate spheres removed 77.3% of dyes, while non entrapped lignocellulose eliminated only removed 27.8% of colour compounds. The experimental data were fitted to several kinetic models (pseudo-first order, pseudo-second order, Chien–Clayton model, intraparticle diffusion model and Bangham model); being pseudo-second order the kinetic model that better described the adsorption of dyes onto both bioadsorbents. In addition, a morphological study (roughness and shape) of alginate-vineyard biocomposite was established under extreme conditions, observing significant differences between hydrated and dehydrated alginate-vineyard biocomposite. The techniques used to carry out this morphological study consisted of scanning electron microscopy (SEM), perfilometry and 3D surface analysis.