Treatment of industrial wastewater containing Congo Red and Naphthol Green B using low-cost adsorbent

Abstract

The present work investigates the potential use of metal hydroxides sludge (MHS) generated from hot dipping galvanizing plant for adsorption of Congo Red and Naphthol Green B dyes from aqueous solutions. Characterization of MHS included infrared and X-ray fluorescence analysis. The effect of shaking time, initial dye concentration, temperature, adsorbent dosage and pH has been investigated. The results of adsorption experiments indicate that the maximum capacity of Congo Red and Naphthol Green B dyes at equilibrium (q(e)) and percentage of removal at pH 6 are 40 mg/g, 93 %, and 10 mg/g, 52 %, respectively. Some kinetic models were used to illustrate the adsorption process of Congo Red and Naphthol Green B dyes using MHS waste. Thermodynamic parameters such as (ΔG, ΔS, and ΔH) were also determined.

Adsorption equilibrium and kinetic studies of crystal violet and naphthol green on torreya-grandis-skin-based activated carbon

“…The larger dye molecule is difficult to penetrate into the adsorbent porous structure due to the pore blockage [24]. The adsorption capacities of CV and NG onto TAC in this work are summarized in Table 2, together with those of the adsorbents reported in the literature [25][26][27][28][29][30][31][32]. The TAC has relatively higher adsorption capacities of NG and CV compared with some other types of previously reported adsorbents [25][26][27][28][29][30][31][32][33].…”

“…The adsorption capacities of CV and NG onto TAC in this work are summarized in Table 2, together with those of the adsorbents reported in the literature [25][26][27][28][29][30][31][32]. The TAC has relatively higher adsorption capacities of NG and CV compared with some other types of previously reported adsorbents [25][26][27][28][29][30][31][32][33]. Although CV has been reported to be efficiently removed by clay minerals [33], our TAC performance is comparable with the commercially available activated carbon [33] and superior to the activated carbon materials prepared by other researches [26][27][28][29].…”

“…The TAC has relatively higher adsorption capacities of NG and CV compared with some other types of previously reported adsorbents [25][26][27][28][29][30][31][32][33]. Although CV has been reported to be efficiently removed by clay minerals [33], our TAC performance is comparable with the commercially available activated carbon [33] and superior to the activated carbon materials prepared by other researches [26][27][28][29]. These results reflect that the TAC is a potential adsorbent for adsorptive removal of CV and NG from aqueous solution.…”

Treatment of Wastewater Containing Crystal Violet Using Walnut Shell

“…More than 15% of the total dyes is released into the water bodies [1]. The discharge of dyes not only poses a serious environmental threat, but also toxic health hazards.…”

Synthesis of Spinel ZnFe2O4 Modified with SDS via Low Temperature Combustion Method and Adsorption Behaviour of Crystal Violet Dye

“…The use of magnetic nano ferrites as adsorbent in waste water treatment can overcome the problems and be readily separated from treated water by applying external magnetic field. Nano ferrites have high adsorption capacity to remove dyes from waste water [24][25][26][27][28]. These types of nano particles have highly reactive surface with less stability in general environmental conditions.…”