Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2020 Nov 30:8:573535.
doi: 10.3389/fchem.2020.573535. eCollection 2020.

Adsorption of Orange II Onto Zn2Al-Layered Double Hydroxide Prepared From Zinc Ash

Andra Tǎmaş  1 , Ioana Cozma  2 , Laura Cocheci  1 , Lavinia Lupa  1 , Gerlinde Rusu  1
Affiliations

Adsorption of Orange II Onto Zn2Al-Layered Double Hydroxide Prepared From Zinc Ash

Andra Tǎmaş et al. Front Chem. .

Abstract

The dye industry is one of the largest water consuming industries, and at the same time generates large quantities of wastewaters. The resulting wastewaters require proper treatment before discharge, because the dye contents have a negative effect on the water body and organisms present in it. The most efficient treatment method for water containing dyes is represented by adsorption processes. The challenge with these adsorption processes is to develop new, efficient, viable, and economic adsorbent materials. Therefore, in the present paper, the performance of Zn2Al-layered double hydroxide, prepared from an industrial waste (zinc ash) as a zinc source, was investigated in the Orange II dye adsorption process. The Zn2Al-layered double hydroxide prepared from secondary sources presents similar morphological and structural characteristics as those prepared from analytical grade reagents. The influence of initial dye concentration, adsorption time, solid:liquid ratio, pH, and temperature was evaluated in order to confirm the benefit of this waste valorization. A comparison with the reference Zn2Al-layered double hydroxide prepared from analytical grade reagents was performed and the results show that due to the small presence of impurities, the material prepared from zinc ash shows better adsorption capacities (qmax,exp = 42.5 mg/g at 293 K) than the material prepared from reagents (qmax,exp = 36.9 mg/g at 293 K), justifying the utilization of secondary sources for layered double hydroxides preparation. The proposed treatment process presents advantages from both economic and environmental protection point of view.

Keywords: Orange II adsorption; equilibrium; kinetics; layered double hydroxides; thermodynamics; zinc ash waste.

PubMed Disclaimer

Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Schematic procedure of Zn2Al–W sample preparation from zinc ash.
Figure 2
Figure 2
SEM images and EDX spectra for (A) LDH-W and (B) LDH-R.
Figure 3
Figure 3
Determination of pHpzc for the adsorbents.
Figure 4
Figure 4
Influence of: (A) initial pH; (B) S:L ratios; (C) initial concentrations of dye and (D) temperature on the Orange II adsorption process at different stirring times.
Figure 5
Figure 5
Pseudo-second-order kinetic models for adsorption of Orange II at: (A) different pH; (B) different S:L ratio; (C) different dye concentrations; (D) different temperatures.
Figure 6
Figure 6
Equilibrium isotherms of Orange II adsorption onto: (A) LDH-R and (B) LDH-W at 293 K.
Figure 7
Figure 7
Equilibrium isotherms of Orange II adsorption onto: (A) LDH-R and (B) LDH-W at 308 K.
Figure 8
Figure 8
Equilibrium isotherms of Orange II adsorption onto: (A) LDH-R and (B) LDH-W at 323 K.
Figure 9
Figure 9
Effect of temperature on the adsorption of Orange II onto the studied materials.
Figure 10
Figure 10
The XRD patterns of (A) LDH–R and (B) LDH–W after Orange II adsorption.
Figure 11
Figure 11
FTIR spectra of (A) Orange II dye; (B) LDH–R after adsorption; (C) LDH–W after adsorption.
Figure 12
Figure 12
Schematic representation on Orange II adsorption onto surface of adsorbents.
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

References

    1. Abramian L., El-Rassy H. (2009). Adsorption kinetics and thermodynamics of azo-dye orange II onto highly porous titania aerogel. Chem. Eng. J. 150, 403–410. 10.1016/j.cej.2009.01.019 - DOI
    1. Aguiar J. E., Bezerra B. T. C., de Melo Braga B., da Silva Lima P. D., Nogueira R. E. F. Q., de Lucena S. M. P., et al. (2013). Adsorption of anionic and cationic dyes from aqueous solution on non-calcined Mg-Al layered double hydroxide: experimental and theoretical study. Sep. Sci. Technol. 48, 2307–2316. 10.1080/01496395.2013.804837 - DOI
    1. Asfaram A., Ghaedi M., Agarwal S., Tyagi I., Kumar Gupta V. (2015). Removal of basic dye Auramine-O by ZnS:Cu nanoparticles loaded on activated carbon: optimization of parameters using response surface methodology with central composite design. RSC Adv. 5, 18438–18450. 10.1039/C4RA15637D - DOI
    1. Banerjee S., Chattopadhyaya M. S. (2017). Adsorption characteristics for the removal of a toxic dye, tartrazine from aqueous solutions by a low cost agricultural by-product. Arab. J. Chem. 10, S1629–S1638. 10.1016/j.arabjc.2013.06.005 - DOI
    1. Barik G., Padhan E., Dash B., Sarangi K., Subbaiah T. (2014). Preparation of layered nickel aluminium double hydroxide from waste solution of nickel. Miner. Eng. 69, 107–112. 10.1016/j.mineng.2014.07.015 - DOI