Adsorption kinetics and thermodynamics of anionic dyes onto sewage sludge derived activated carbon

Removal of acid turquoise blue 2G from aqueous solution by adsorbent derived from sludge and straw: kinetic, isotherm and thermodynamic study

“…However, intra-particle diffusion rate constant k p and elovich rate constant α increased with increasing initial dye concentration. These findings were in agreement with those obtained by other workers [10,12,13,17,35,36]. Pseudo-first order dqt dt ¼ k 1 ðq e À q t Þ lnðq e À q t Þ ¼ ln q e À k 1 t lnðq e À q t Þ vs: t q e ¼ expðinterceptÞ k 1 ¼ ÀðslopeÞ Effect of the equilibrium concentration of the adsorbate (c e ) on the amount of acid turquoise blue 2G adsorbed (q e ) at different temperatures (288, 298, and 308 K) has been investigated, and the results are shown in Fig.…”

“…When the initial dye concentrations were 0.435, 0.290, and 0.145 mmol·L −1 , the equilibrium times were, respectively, 660, 300, and 120 min. It is shown that in low initial concentrations, the equilibrium would be reached faster [13,17,29]. This may be because the competition among dye molecules for active adsorption sites will be more intense in higher initial concentrations.…”

“…Various treatment methods have been applied for the removal of dyes from colored wastewater, which include photo-catalytic degradation [5], electro-coagulation [6], oxidation [7,8], membrane filtration [9], biotechnology, [10] and adsorption [11][12][13][14][15][16]. Among these, adsorption process has shown to be highly efficient to remove the dyestuff, pigments, and other chemicals from wastewater.…”

“…With the rapid growth of population and urbanization, the output of excess sludge is expected to rise in next decades. Previous investigations showed that sludge is rich in carbonaceous organic material and can be converted chemically into relatively cheap adsorbents for dyes removal from industrial effluents [10,12,13,17,31,32]. The aim of this study was to investigate the adsorption capacity of acid turquoise blue 2G onto the adsorbent derived from sludge and straw.…”

Paper-like composites of cellulose acetate–organo-montmorillonite for removal of hazardous anionic dye in water

“…Typically, the water containing Acid Scarlet G (ASG), a frequently used dye in industry, is not only harmful to the aquatic organisms and plants, but also is hazardous to human beings. Activated carbon [16,17], chitosan modified montmorillonite [18], cross-linked chitosan film [19], and amine functionalized titania/silica nano-hybrid [20] have been tested as adsorbents for the removal of ASG from wastewater. In many cases, the practical applications of these materials are limited either by the low adsorption capacity or the difficulty of separation.…”