Adsorption of Orange II dye in aqueous solution onto surfactant-coated zeolite: Characterization, kinetic and thermodynamic studies

Sorption of acid dye by surfactant modificated natural zeolites

“…Good coefficients of determination (>0.99) was obtained for the pseudosecond-order kinetic model and reveals that the sorption process follows this model. A similar phenomenon was observed in sorption of Orange II dye from aqueous solution onto surfactant-coated zeolite [12] and Acid Blue 193 by surfactant modified Sepiolite [50]. The reduction in the pseudo-second-order rate constant, k 2 , from 0.052 to 0.003 g/mg min, can be resulted from the prolongation of the sorption equilibrium time period due to the increase in the initial concentration of the dye [12].…”

“…Clay minerals, as low cost natural adsorbents, are natural scavenger of pollutants from water through adsorption mechanisms [10] and ion exchange process [11]. Natural zeolites are good adsorbent for the dyes [12,13] and they have already found many applications because of their high cation-exchange capacity and surface area. They are mainly composed of aluminosilicates with a three dimensional framework structure bearing AlO 4 and SiO 4 tetrahedra that are linked to each other by sharing all of their oxygens to form interconnected cages and channels containing mobile water molecules and alkalis and/or alkaline earths [14].…”

Magnetic adsorbents for the treatment of water/wastewater—A review

“…Some adsorbents which have been widely used for water purification are activated carbon [24][25][26][27][28][29][30][31], silica gel [32][33][34][35][36], zeolite [37][38][39][40][41][42][43], clay minerals [44][45][46][47]. However due to their high generation costs, researchers shifted their focus to the use of dead biomass and waste such as peanut shell [48], garden grass [49], ground coffee [50], saw dust [51][52], sunflower leaves [53], egg shells [54], almond shell [55] sugarcane bagasse [56], Anabaena sphaerica [57], Bacillus laterosporus [58], green algae [59], orange peel [60], pine cone [61], guava leaf [62] for the removal of dyes, metals and organic pollutants from wastewater.…”

Post-treatment of plywood mill effluent by Multi-Barrier Treatment: A pilot-scale study

“…Even at low concentrations, phenol is highly toxic, carcinogenic, and teratogenic and a potential mutagen in aquatic environments [30,[32][33][34]. Azo orange II is a common dye that is used in textile, leather, painting and printing processes [35]. Azo dyes are resistant to aerobic degradation and, under anoxic conditions, can generate aromatic amines, most of which are colourless but toxic and potentially carcinogenic [36,37].…”