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Abstract
3-aminopropyltriethoxysilane functionalized nanoscale zero-valent iron for the removal of dyes from aqueous solution Batch studies were conducted to investigate the potential of 3-aminopropyltriethoxysilane modified nano zero-valent iron (APS-NZVI) to adsorb two dyes (acid brilliant scarlet GR and reactive brilliant red K-2BP) from aqueous solution. APS-NZVI showed good adsorption performance for two dyes. Under the adsorption conditions of pH 4.5, initial concentration was 100 mg/L, and time=4h, the maximum adsorption capacities of APS-NZVI were 121.06 mg/g for acid brilliant scarlet GR and 191.5 mg/g for reactive brilliant red K-2BP, respectively. The results revealed that the adsorption behavior of the dyes on the nano-particles fitted well with the Langmuir model and the sorption kinetics fits well the pseudo-second-order rate equation.
Highlights
With the increasing demands of textile products, printing and dyeing wastewaters have been largely produced, which becomes one of the main sources of severe pollution problems worldwide
APS-NZVI is utilized for the adsorption of acid brilliant scarlet GR and reactive brilliant red K-2BP from an aqueous solution
The results revealed that the adsorption behavior of the dyes on the nano-particles fitted with the Langmuir model and the sorption kinetics fitted with the pseudo-second-order rate equation
Summary
With the increasing demands of textile products, printing and dyeing wastewaters have been largely produced, which becomes one of the main sources of severe pollution problems worldwide. Acid brilliant scarlet GR and reactive brilliant red K-2BP are the widely used dyeing reagents. The color produced by great amounts of organic dyes in water is of great concern because the color in water is aesthetically unpleasant[1,2] They are the major sources of water pollution, which remain in waste effluents and undergo chemical changes, consuming dissolved oxygen. APS-NZVI is utilized for the adsorption of acid brilliant scarlet GR and reactive brilliant red K-2BP from an aqueous solution. APS-NZVI has shown good adsorption performance for brilliant scarlet GR (Scheme 1) and reactive brilliant red K-2BP (Scheme 2). Acid brilliant scarlet and reactive brilliant red K-2BP (>98%) were purchased from Beijing Chemical Reagent Co. The 3-aminopropyltriethoxysilane solution was prepared by dissolving the compound into ethanol/water (volume ratio is 2:1).
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