Kinetic Modeling of Methylene Blue and Crystal Violet Dyes Adsorption on Alginate-Fixed Water Hyacinth in Single and Binary Systems

Abstract

Removal of Methylene Blue (MB) and Crystal Violet (CV) dyes from monocomponent and binary aqueous solutions by water hyacinth-E. Crassipes roots fixed on alginate (a low-cost adsorbent) has been investigated. The extent of adsorption was evaluated as a function of solution pH, initial dye concentration, and bead biomass loading. Kinetic sorption data were analysed by widely used models: pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The results showed that pseudo-second-order model better described the biosorption experimental data than the pseudo-first-order kinetic model for both dyes, whilst the Elovich model fitted the biosorption experimental data at lower dye concentrations. The intraparticle diffusion model indicated that sorption of CV and MB was characterized by rapid surface adsorption coupled with slow film diffusion process at higher initial dye concentration and at all initial bead biomass loading. The range of mean free energy values confirmed physical adsorption as the mechanism for dye removal from solution.

Decolorization of Basic Dyes Solution by Utilizing Fruit Seed Powder

“…This figure clearly indicates that the percentage removal increases while adsorption capacity decreases to a considerable extent for both dyes. At a high adsorbent dose, the increase in percentage removal was caused by the availability of more adsorption sites, and a drop in adsorption capacity was caused by the lowering of surface area per unit mass of the adsorbent (Mashkoor and Nasar, 2019). This observation concludes that the adsorptive performance of PGSP is higher for CV than for MB.…”

“…al., 2018), and Luffa aegyptica (Mashkoor and Nasar, 2019) have been well employed in recent years for the removal of water contaminants.…”

Partial removal and detoxification of Malachite Green and Crystal Violet from laboratory artificially contaminated water by Pleurotus ostreatus

“…The following parameters were calculated according to the straight-line equation described by each model: Maximum amount of dye adsorbed in mg per gram of biomass (qe), Adsorption coefficient (k), Adsorption coefficient of pseudo-second order (k 2 ), Initial rate adsorption (α) and Desorption coefficient (β) and the Constant of film difussion (k) (Table 2) (Oladoja et al, 2008, Mahamadi & Mawere 2013. The residual root means the square errors (RMSE) and correlation coefficient (R 2 ) of kinetic models allowed measuring the goodness of fit (Puentes et al, 2016).…”

“…Pseudo first-order ln (qe-q) =l n qe-k t (2) (Oladoja et al, 2008, Mahamadi & Mawere 2013 Pseudo second-order (3) Zucconi et al (1985) and calculated with equation 6:…”

Surface composition and surface properties of water hyacinth (Eichhornia crassipes) root biomass: Effect of mineral acid and organic solvent treatment

“…It has flourishing roots composed mainly of cellulose and lignin (Zheng et al, 2009). It has been investigated extensively for the removal of dyes from aqueous solution (Tarawou et al, 2007;Low et al, 1995;Rajamohan, 2009;Aboul-Fetoula et al, 2010;Saltabas et al, 2012;Khan et al, 2012;El-Khalary, 2007;Modenes et al, 2013;Mahamadi and Mawere, 2013;Uddin et al, 2013;Rajamohan et al, 2013;Kaur et al, 2013;Nath et al, 2014). Water hyacinth has also been investigated for the removal of phenols from polluted water by Woverton and McKown (1976).…”