Adsorption of textile dyes on alumina. equilibrium studies and contact time effects

Abstract

The use of nonconventional adsorbents, particularly those that can be easily regenerated, to replace activated carbon in the removal of color from dye wastewaters has been recently proposed. This work shows a thermodynamic and kinetic study of the adsorption of reactive dyes (yellow monochlorotriazine and yellow dichlorotriazine), in liquid phase, on commercial alumina. The basic thermodynamic data were obtained using the static method, with a thermostatic bath at four different temperatures (30, 40, 50 and 60oC) and different pH values. The kinetic data were obtained by adding a known quantity of adsorbent to a dye solution at a constant temperature and under controlled stirring conditions. It was possible to draw the uptake curves, using the effects of the stirring on the adsorption rate. The intraparticle effective diffusivity was estimated using the film and pore diffusion model. The results were compared with the data obtained using a commercial activated carbon

Desorption and Re-Adsorption of Procion Red MX-5B Dye on Alumina-Activated Carbon Composite

“…Several methods have been studied to reduce synthetic dye contained in wastewater such as photocatalytic, chemical oxidation and adsorption [2][3][4]. Adsorption is considered as the most effective method to reduce dyes contaminated in textile industrial wastewater [5]. Adsorption has several advantages such as relatively low-cost, easy and simple to be carried out, and provide high sorption efficiency [6].…”

“…Alumina is also known to have pore system and active sites on its surface. Alumina was reported by several researchers for having the ability to adsorb orange G, yellow monochlorotriazine, and yellow dichlorotriazinecolor black G [5,[15][16]. Surface modification of adsorbent using alumina was expected to increase the adsorption capacity as shown by modification of bentonite-alumina [17], alumina-chitosan [18], and activated carbonalumina [19][20].…”

Adsorption of dyes from aqueous solutions on activated charcoal

“…Control of water pollution has importance for both organisms, which live in water and those who benefit from water. Many dyes reaching the water source are difficult to decompose and cause many problems due to their carcinogenicity [2][3][4]. Consequently, it is important to remove these pollutants from wastewater before their final disposal.…”

Thermal characterization of methylene blue intercalated montmorillonites by photoacoustic technique

“…Of all the dyes available, approximately 50% to 70% are aromatic azo compounds, which are known carcinogens. A variety of physical, chemical and biological methods have been used for the dye exclusion during the waste-water treatment (Moreira et al, 1998;Al-Ghouti et al, 2003;Almeida et al, 2004;Gregorio, 2006;Fernandes et al, 2007;Khenifi et al, 2007;Luiz et al, 2007;Soon-An et al, 2007) and diverse clays can be employed for dye adsorption (Brooks, 1964;Lin et al, 2007;Saeed et al, 2007). Methylene blue (MB) is a toxic, halogenated, aromatic hydrocarbon that is seen in the textile factory effluent streams.…”