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. 2022 Aug 20;12(1):14242.
doi: 10.1038/s41598-022-18598-7.

Hexavalent chromium elimination from wastewater by integrated micro-electrolysis composites synthesized from red mud and rice straw via a facile one-pot method

Huabin Wang  1   2 , Ting Cui  1   2 , Dingxiang Chen  1   2 , Qiong Luo  1   2 , Jiwei Xu  1   2 , Rong Sun  1   2 , Wenhua Zi  1   2 , Rui Xu  3   4 , Ying Liu  5   6 , Yong Zhang  7   8
Affiliations

Hexavalent chromium elimination from wastewater by integrated micro-electrolysis composites synthesized from red mud and rice straw via a facile one-pot method

Huabin Wang et al. Sci Rep. .

Abstract

The widely spread chromium (Cr) contamination is rising environmental concerns, while the reutilization of agro-industrial by-products are also urgently demanded due to their potential risks. In this study, we prepared the integrated micro-electrolysis composites (IMC) through a facile one-pot method with red mud and rice straw. The effects of components relatively mass ratios as well as pyrolysis temperature were analyzed. The XRD, XPS, SEM, FTIR, and various techniques proved the IMC was successfully synthesized, which was also used to analyze the reaction mechanisms. In this study, the dosage of IMC, pH, adsorption time, and temperature of adsorption processes were explored, in the adsorption experiment of Cr(VI), dosage of IMC was 2 g/L (pH 6, 25 °C, and 200 rpm) for isothermal, while the concentration and contact time were also varied. According to the batch experiments, IMC exhibited acceptable removal capacity (190.6 mg/g) on Cr(VI) and the efficiency reached 97.74%. The removal mechanisms of adsorbed Cr(VI) were mainly elaborated as chemical reduction, complexation, co-precipitation, and physical adherence. All these results shed light on the facile preparation and agro-industrial by-products recycled as engineering materials for the heavy metals decontamination in wastewater.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
XRD patterns (a), (b) and the high-resolution C 1 s, Fe 2p spectra of IMC (c), (d).
Figure 2
Figure 2
SEM–EDS analysis of IMC (a–e), Fourier transform infrared spectra (FT-IR) at different ratios of IMC800 (f).
Figure 3
Figure 3
Removal capacity of various IMC materials (a), Influence of dosage on removing Cr(VI)of IMC (b), pH and Zeta potential determination (c), (d).
Figure 4
Figure 4
Influence of contact time on Cr(VI) sorption by IMC800-1 (a), the fit results of Langmuir and Freundlich models for IMC800-1 (b–d).
Figure 5
Figure 5
XRD patterns of IMC800-1 before and after adsorption (a), FTIR before and after adsorption (b).
Figure 6
Figure 6
XPS spectra of IMC800-1 before and after Cr(VI) adsorption: (a), (b) C 1 s, (c), (d) Fe 2p, (e) Cr 2p, (f) Full spectra.
Figure 7
Figure 7
Adsorption mechanism of Cr(VI) by IMC.
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