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Concurrent adsorption and reduction of chromium(VI) to chromium(III) using nitrogen-doped porous carbon adsorbent derived from loofah sponge

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Abstract

To develop highly effective adsorbents for chromium removal, a nitrogen-doped biomass-derived carbon (NHPC) was synthesized via direct carbonation of loofah sponge followed by alkali activation and doping modification. NHPC possessed a hierarchical micro-/mesoporous lamellar structure with nitrogen-containing functional groups (1.33 at%), specific surface area (1792.47 m2/g), and pore volume (1.18 cm3/g). NHPC exhibited a higher Cr(VI) adsorption affinity than the HPC (without nitrogen doping) or the pristine loofah sponge carbon (LSC) did. The influence of process parameters, including pH, dosage, time, temperature, and Cr(VI) concentration, on Cr(VI) adsorption by NHPC were evaluated. The Cr(VI) adsorption kinetics matched with the pseudo-second-order model (R2 ⩾ 0.9983). The Cr(VI) adsorption isotherm was fitted with the Langmuir isotherm model, which indicated the maximum Cr(VI) adsorption capacities: 227.27, 238.10, and 285.71 mg/g at 298K, 308K, and 318K, respectively. The model analysis also indicated that adsorption of Cr(VI) on NHPC was a spontaneous, endothermal, and entropy-increasing process. The Cr(VI) adsorption process potentially involved mixed reductive and adsorbed mechanism. Furthermore, computational chemistry calculations revealed that the adsorption energy between NHPC and Cr(VI) (−0.84 eV) was lower than that of HPC (−0.51 eV), suggesting that nitrogen doping could greatly enhance the interaction between NHPC and Cr(VI).

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Acknowledgements

This work is financially funded by the National Natural Science Foundation of China (Grant No. 41872169), the Project of Education Department of Henan Province (No. 21A610002), and the Innovation and entrepreneurship training plan for college students of Henan Province in 2020 (No. S202011517004). The authors would also like to thank the workers in Shiyanjia Laboratory for the DFT calculation and language editing service.

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Authors and Affiliations

  1. School of Environmental and Biological Engineering, Henan University of Engineering, Zhengzhou, 451191, China

    Feng Chen, Shihao Guo, Yihao Wang, Lulu Ma, Bing Li & Zhimin Song

  2. School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China

    Lei Huang

  3. Guangzhou University-Linköping University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, China

    Lei Huang

  4. John A. Reif, Jr. Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ, 07102, USA

    Wen Zhang

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  1. Feng Chen
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  2. Shihao Guo
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  3. Yihao Wang
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  4. Lulu Ma
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  5. Bing Li
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  6. Zhimin Song
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  7. Lei Huang
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  8. Wen Zhang
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Correspondence to Zhimin Song or Lei Huang.

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Highlights

• A high-efficiency N-doped porous carbon adsorbent for Cr(VI) was synthesized.

• The maximum adsorption capacity of Cr(VI) reached up to 285.71 mg/g at 318K.

• The potential mechanism for Cr(VI) adsorption by NHPC was put forward.

• DFT analyzed the adsorption energy and interaction between NHPC and Cr(VI).

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Chen, F., Guo, S., Wang, Y. et al. Concurrent adsorption and reduction of chromium(VI) to chromium(III) using nitrogen-doped porous carbon adsorbent derived from loofah sponge. Front. Environ. Sci. Eng. 16, 57 (2022). https://doi.org/10.1007/s11783-021-1491-6

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  • DOI: https://doi.org/10.1007/s11783-021-1491-6

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