Removal of crystal violet from aqueous solution using environment-friendly and water-resistance membrane based on polyvinyl/agar/maltodextrin

In the past few decades, dye-based contamination has been considered as a severe environmental problem faced by many developing countries due to increasingly growth of textile industry. Carbon-based materials have found as an excellent adsorbent for organic species because of its porous structure. Conversely, the cost-inefficiency and the difficulty to collect them after use, is the mainly negative mark when applying them in the large-scale. Thus, the development of low-cost, facile processing and eco-friendly membranes with high performance and high adsorption capacity for dye-based pollutants should be considered as a very important and urgent task. Herein, we wish to report the application of poly (vinyl alcohol)-based blend membranes combined with agar and maltodextrin for the elimination of crystal violet (CV) in water media. These blend membranes were fabricated via the simple solvent casting process. Effect of different factors, e.g., contact time between adsorbents and adsorbates, solution pH, and initial crystal violet concentration on the uptake capacity of blend membrane was studied in batch model. The obtained results revealed that adsorption kinetic was well obeyed with Pseudo-second order model, which was mainly controlled by chemisorption process. Langmuir model still well-described for adsorption isotherm for crystal violet dye of poly (vinyl alcohol) membrane combined with agar and maltodextrin. The maximum amount of CV uptake by blend membrane was found to be 84.618 mg·g⁻¹. These outcomes indicate a potential use of poly (vinyl alcohol)-based blend membranes combined with agar and maltodextrin for the elimination of CV in water media.