Removal of Reactive Red 198 from aqueous solution by combined method multi-walled carbon nanotubes and zero-valent iron: Equilibrium, kinetics, and thermodynamic

doi:10.1016/j.cjche.2016.04.027

Abstract

Abstract: Dyes often include toxic, carcinogenic compounds and are harmful to humans' health. Therefore, removal of dyes fromtextile industry wastewater is essential. The present study aimed to evaluate the efficiency of the combination of zero valent iron (ZVI) powder and multi-walled carbon nanotubes (MWCNTs) in the removal of Reactive Red 198 (RR198) dye from aqueous solution. This applied research was performed in a batch system in the laboratory scale. This study investigated the effect of various factors influencing dye removal, including contact time, pH, adsorbent dose, iron powder dose, initial dye concentration, and temperature. The equilibrium adsorption data were analyzed using three common adsorption models:Langmuir, Freundlich and Temkin. Besides, kinetic and thermodynamic parameterswere used to establish the adsorption mechanism. The results showed, in pH=3, contact time=100min, ZVI dose=5000mg·L^-1, andMWCNTs dose=600 mg·L^-1 in 100mg·L^-1 dye concentration, the adsorption efficiency increased to 99.16%. Also, adsorption kinetics was best described by the pseudo-second-ordermodel. Equilibriumdata fitted wellwith the Freundlich isotherm(R²=0.99). The negative values of ΔG₀ and the positive value of ΔH₀ (91.76) indicate that the RR198 adsorption process is spontaneous and endothermic. According to the results, the combination of MWCNTs and ZVI was highly efficient in the removal of azo dyes.

Key words: Reactive Red 198, MWCNTs, Adsorption, ZVI, Dye

摘要： Dyes often include toxic, carcinogenic compounds and are harmful to humans' health. Therefore, removal of dyes fromtextile industry wastewater is essential. The present study aimed to evaluate the efficiency of the combination of zero valent iron (ZVI) powder and multi-walled carbon nanotubes (MWCNTs) in the removal of Reactive Red 198 (RR198) dye from aqueous solution. This applied research was performed in a batch system in the laboratory scale. This study investigated the effect of various factors influencing dye removal, including contact time, pH, adsorbent dose, iron powder dose, initial dye concentration, and temperature. The equilibrium adsorption data were analyzed using three common adsorption models:Langmuir, Freundlich and Temkin. Besides, kinetic and thermodynamic parameterswere used to establish the adsorption mechanism. The results showed, in pH=3, contact time=100min, ZVI dose=5000mg·L^-1, andMWCNTs dose=600 mg·L^-1 in 100mg·L^-1 dye concentration, the adsorption efficiency increased to 99.16%. Also, adsorption kinetics was best described by the pseudo-second-ordermodel. Equilibriumdata fitted wellwith the Freundlich isotherm(R²=0.99). The negative values of ΔG₀ and the positive value of ΔH₀ (91.76) indicate that the RR198 adsorption process is spontaneous and endothermic. According to the results, the combination of MWCNTs and ZVI was highly efficient in the removal of azo dyes.

关键词: Reactive Red 198, MWCNTs, Adsorption, ZVI, Dye

Sudabeh Pourfadakari, Nader Yousefi, Amir Hossein Mahvi. Removal of Reactive Red 198 from aqueous solution by combined method multi-walled carbon nanotubes and zero-valent iron: Equilibrium, kinetics, and thermodynamic[J]. , 2016, 24(10): 1448-1455.

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