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. 2019 Jul 16;9(38):21996-22003.
doi: 10.1039/c9ra04003j. eCollection 2019 Jul 11.

Efficient removal of crystal violet dye using EDTA/graphene oxide functionalized corncob: a novel low cost adsorbent

Huan Wang  1 , Xin Lai  1 , Wei Zhao  1 , Youning Chen  1 , Xiaoling Yang  1 , Xiaohua Meng  1 , Yuhong Li  1
Affiliations

Efficient removal of crystal violet dye using EDTA/graphene oxide functionalized corncob: a novel low cost adsorbent

Huan Wang et al. RSC Adv. .

Abstract

In this study, EDTA functionalized corncob (EDTA-corncob) and EDTA/graphene oxide functionalized corncob (EDTA-GO/corncob) were prepared using disodium ethylenediamine tetraacetic acid and the graphene oxide immersion method. EDTA-corncob and EDTA-GO/corncob were characterized by SEM and FTIR spectroscopy. On this basis, the adsorption properties of EDTA-corncob and EDTA-GO/corncob were studied with crystal violet as the adsorbate. The optimum adsorption conditions were determined by the effect of samples on the adsorption properties of crystal violet at different times, temperatures and pH, and the reusability of the samples was studied. The results showed that adsorption capacity of crystal violet on EDTA-GO/corncob was higher compared with natural corncob and EDTA-corncob. The most suitable pH value of the solution is about 6.0, the adsorption equilibrium time is 200 min. EDTA-GO/corncob can be reused eight times. This study indicated that EDTA-GO/corncob is a reusable adsorbent for rapid, low-cost, and efficient removal of dye from waste water.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. SEM of corncob (a and c) and EDTA-GO/corncob (b and d).
Fig. 2
Fig. 2. FTIR spectra of adsorbents. (a) GO; (b) corncob; (c) EDTA/corncob; (d) EDTA-GO/corncob.
Fig. 3
Fig. 3. Comparisons of adsorption capacity (pH = 7.0) (1) methylene blue; (2) crystal violet; (3) acridine orange; (4) methyl red; (5) acid chrome blue K; (6) rhodamine B; (7) orange IV.
Fig. 4
Fig. 4. Chemical structure of crystal violet.
Fig. 5
Fig. 5. Adsorption kinetics.
Fig. 6
Fig. 6. Adsorption isotherms.
Fig. 7
Fig. 7. (a) Effect of pH on the adsorption capacity. (b) Zeta potential at the different pH.
Fig. 8
Fig. 8. Effect of NaCl on the adsorption capacity.
Fig. 9
Fig. 9. The interaction mechanisms.
Fig. 10
Fig. 10. Reusability of EDTA/corncob and EDTA-GO/corncob.
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