Organofunctionalized kenyaite for dye removal from aqueous solution

Abstract

Crystalline layered sodium kenyaite was exchanged to proton kenyaite when reacted with hydrochloric acid solution, providing a new surface with available silanol groups that are able to couple with N-3-trimethoxysilylpropylethylenediamine silylating agent, after prior expansion of the basal distance with the polar organic solvent dimethyl sulfoxide. The resulting organofunctionalized nanomaterial (2N-Ken) was characterized by elemental analysis, infrared spectroscopy, X-ray diffraction, carbon and silicon nuclear magnetic resonances in the solid state, surface analysis, porosity, thermogravimetry, and electron scanning microscopy. The quantity of silylating agent incorporated into the nanospace, calculated from the nitrogen elemental analysis, was determined as 0.48 mmol g(-1), after expanding of the acidic precursor basal distance from 1.62 to 1.99 nm. The presence of a covalent silicon-carbon bond of the organosilyl moiety on the inorganic layered structure was confirmed through nuclear magnetic resonance. This new nanomaterial has the ability to extract the Sumifix Brilliant Orange 3R textile dye from aqueous solution, using a batchwise process. The effects of stirring time, adsorbent dosage, and pH on the adsorption capacity demonstrated that 4 h is enough to reach equilibrium at 298+/-1 K under pH 4.0. Based on error function values (F(error)) the data were best fitted to fractional-order and chemisorption kinetic models when compared to pseudo-first-order and pseudo-second-order kinetic models. The equilibrium data were better fitted to the Sips isotherm model.

Removal of Brilliant Green Dye from Aqueous Solutions Using Home Made Activated Carbons

“…This process transfers the dye species from the water effluent to a solid phase thereby keeping the effluent volume to a minimum [7][8][9]. Subsequently, the adsorbent can be regenerated or stored in a dry place without direct contact with the environment [5][6][7][8][9].…”

“…This process transfers the dye species from the water effluent to a solid phase thereby keeping the effluent volume to a minimum [7][8][9]. Subsequently, the adsorbent can be regenerated or stored in a dry place without direct contact with the environment [5][6][7][8][9].Activated carbon is the most employed adsorbent for toxic species removal from aqueous effluents because of well-developed pore structures and a high internal surface area that leads to its excellent adsorption properties [10,11]. Besides these physical characteristics, the adsorption capacity is also dependent on the source of organic material employed for the production of the activated carbon [10][11][12][13], as well as the experimental conditions employed in the activation processes [11].…”

Adsorption of a textile dye from aqueous solutions by carbon nanotubes

“…Therefore, effluents containing dyes require treatment before being released into the environment [1][2][3][4] . The most efficient method for the removal of synthetic dyes from aqueous effluents is the adsorption process 6,7 . This process transfers dyes from the water effluent to a solid phase and remarkably decreases dye bioavailability to living organisms 3 .…”

“…The adsorbent can be regenerated or stored in a dry place without direct contact with the environment 3 . Different adsorbents have been used for the removal of dyes from aqueous solutions 4,[6][7][8] . Among these, carbon nanotube (CNTs) materials have been utilised for the successful removal of dyes from aqueous effluents [7][8][9][10][11][12][13][14] .…”

Adsorção de corantes aniônicos de solução aquosa em cinza leve de carvão e zeólita de cinza leve de carvão

“…Os experimentos foram realizados sob agitação de 120 rpm, com concentrações iniciais fixas de cada corante, nos tempos de equilíbrio de cada sistema adsorvente/corante e com variação de massa na faixa de 0,05 a 0,5 g em 25 mL de solução de cada corante (Royer et al, 2009).…”