Sorption of Synthetic Dyes Onto River Sediments: A Laboratory Study

Abstract

This work deals with sorption of cationic synthetic dye thioflavine T (ThT) onto the river sediment obtained from the Váh River under conditions of batch and column system using spectrophotometric methods. We found that sorption of ThT onto river sediment was a rapid process with reaching of concentration equilibrium within 2 h of interaction. The values of distribution coefficient (DC) defined as concentration ratio [ThT]sediment : [ThT]solution were linearly increased with increasing concentration of river sediment in solution within the range Csediment 1.25 - 10.0 g/dm3 and minimally changed in the range of initial pH values 2 - 6. The increasing concentration of ThT in model solution caused exponentially decrease in the value of DC. The sorption processes characterized by dependence between equilibrium specific sorption Qeq and ThT concentration Ceq in solution were better described by adsorption isotherm according to Freundlich (R2 = 0.979) than according to Langmuir adsorption isotherm (R2 = 0.914). From evaluation of ThT sorption onto river sediment in column system containing of 5 cm sediment layer with 30 cm of water column on the basis of ThT concentration changes in infiltrated water we found that these processes were significantly dependent on the rate of infiltrated water flow through the sediment layer Riw as well as on qualitative and quantitative composition of water. The highest ThT desorption from the sediment layer was found in seepage of 50 % (v/v) ethanol (EtOH) solution through the sediment and efficiency of ThT desorption decreased in the order: 50 % (v/v) EtOH > 0.1 mol/dm3 HCl > deionized water. Obtained data from the point of view of physico-chemical characteristics of the river sediment, such as pH, pHzpc (potentiometric titration), cation-exchange capacity (CEC) and elemental composition (X-ray fluorescence spectrometry), was also discussed

Sorption of Remazol Black B dye in alluvial soils of the Capibaribe River Basin, Pernambuco, Brazil

“…Freundlich isotherms model also satisfactorily described the sorption of Thioflavin dye in sediments taken from the banks of the Váh River, in Šaľa city, Slovak Republic (Bachratá et al, 2013), and of Basic Yellow X-5GL, Basic Red 13, Direct Blue 86, Vat Yellow 2 and Mordant Black 11 dyes in sediments from the Qinghe River (Liu et al, 2001). Other studies also reported a good correlation of the Freundlich equation with experimental data of dye sorption in soils, such as the Acid Yellow 23 (Dawodu and Akpomie, 2016), Basic Blue 9 (Sana and Jalila, 2016), Congo Red (Smaranda et al, 2011), and Acid Red 14 dye (Qu et al, 2008).…”

“…The graphs corresponding to Freundlich model adjustments for CM 1 and CM 2 are shown in Figure 3. Considering the chemical composition of the sediment, it can be stated that its organic and inorganic components will significantly affect the sorption capacity (Bachratá et al, 2013). Regarding the organic component, Liu et al (2001) verified a decrease in sorption of the anionic Rev.…”

“…On the one hand, when pH is lower than ZCP, the matrix has a positively charged surface. On the other hand, if the matrix has a pH higher than ZCP, the surface is negatively charged (Dawodu and Akpomie, 2016;Bachratá et al, 2013). Positively charged surfaces favor the sorption of anionic species, while negatively charged surfaces favor the sorption of cationic species (Dawodu and Akpomie, 2016).…”

Chemometric Characterization of Synthetic Dye Sorption onto Slovakian River Sediments: A Laboratory Batch Experiment

“…This fact indicates that metals weakly bound into sediments can be released at slightly acidic conditions. However, in the case of organic xenobiotics bound onto sediments, such as cationic synthetic dyes, they can be released not only at acidic conditions, but more significantly in conditions of less polar solutions, e.g., diluted solutions of alcohols or organic solvents [20].…”

“…Our previous papers dealt with mathematical modelling of data characterizing the continuous sorption of cationic dyes thioflavine T (ThT) and malachite green on dried biomass of microalga Chlorella pyrenoidosa [19] as well as with description of synthetic cationic dye ThT sorption onto river sediments under conditions of batch and column systems [20]. The present work is focused on the characterization of benzothiazole cationic dye ThT and thiazine cationic dye methylene blue (MB) sorption onto selected Slovakian river sediments using chemometric approaches including principal component analysis (PCA) and cluster analysis (CA).…”