Green-synthesized, biochar-supported nZVI from mango kernel residue for aqueous hexavalent chromium removal: Performance, mechanism and regeneration

doi:10.1016/j.cjche.2024.04.009

Chinese Journal of Chemical Engineering ›› 2024, Vol. 71 ›› Issue (7): 91-101.DOI: 10.1016/j.cjche.2024.04.009

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Green-synthesized, biochar-supported nZVI from mango kernel residue for aqueous hexavalent chromium removal: Performance, mechanism and regeneration

Yuting Zhang¹, Yuwei Tang¹, Ruiping Yan¹, Shuang Liang¹, Zhongmou Liu¹, Yadong Yang²

1. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China;
2. School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China

Received:2023-11-23 Revised:2024-03-20 Online:2024-08-30 Published:2024-07-28
Contact: Zhongmou Liu,E-mail:liuzm6988@163.com
Supported by:
This study was financially supported by the National Natural Science Foundation of China (51808253), the Science and Technology Planning Project of Jilin Province (20220508008RC), Science and Technology Project of Jilin Provincial Education Department (JJKH20220295KJ and JJKH20210272KJ), and the Science and Technology Projects of the Ministry of Housing and Urban-Rural Development (2018-K6-003).

Green-synthesized, biochar-supported nZVI from mango kernel residue for aqueous hexavalent chromium removal: Performance, mechanism and regeneration

Yuting Zhang¹, Yuwei Tang¹, Ruiping Yan¹, Shuang Liang¹, Zhongmou Liu¹, Yadong Yang²

1. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China;
2. School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China

通讯作者: Zhongmou Liu,E-mail:liuzm6988@163.com
基金资助:
This study was financially supported by the National Natural Science Foundation of China (51808253), the Science and Technology Planning Project of Jilin Province (20220508008RC), Science and Technology Project of Jilin Provincial Education Department (JJKH20220295KJ and JJKH20210272KJ), and the Science and Technology Projects of the Ministry of Housing and Urban-Rural Development (2018-K6-003).

Abstract

Abstract: A biochar-supported green nZVI (G-nZVI@MKB) composite was synthesized using mango kernel waste with “dual identity” as reductant and biomass of biochar. The G-nZVI@MKB with a Fe/C mass ratio of 2.0 (G-nZVI@MKB2) was determined as the most favorable composite for hexavalent chromium (Cr(VI)) removal. Distinct influencing parameters were discussed, and 99.0% of Cr(VI) removal occurred within 360 min under these optimized parameters. Pseudo-second order kinetic model and intra-particle diffusion model well depicted Cr(VI) removal process. The XRD, FTIR, SEM, and XPS analyses verified the key roles of G-nZVI and functional groups, as well as the primary removal mechanisms involving electrostatic attraction, reduction, and complexation. G-nZVI@MKB2 exhibited good stability and reusability with only a 16.4% decline in Cr(VI) removal after five cycles. This study offered evidence that mango kernel could be recycled as a beneficial resource to synthesize green nZVI-loaded biochar composite for efficient Cr(VI) elimination from water.

Key words: Synthesis, Biochar-supported nZVI, Hexavalent chromium, Reduction, Regeneration

摘要： A biochar-supported green nZVI (G-nZVI@MKB) composite was synthesized using mango kernel waste with “dual identity” as reductant and biomass of biochar. The G-nZVI@MKB with a Fe/C mass ratio of 2.0 (G-nZVI@MKB2) was determined as the most favorable composite for hexavalent chromium (Cr(VI)) removal. Distinct influencing parameters were discussed, and 99.0% of Cr(VI) removal occurred within 360 min under these optimized parameters. Pseudo-second order kinetic model and intra-particle diffusion model well depicted Cr(VI) removal process. The XRD, FTIR, SEM, and XPS analyses verified the key roles of G-nZVI and functional groups, as well as the primary removal mechanisms involving electrostatic attraction, reduction, and complexation. G-nZVI@MKB2 exhibited good stability and reusability with only a 16.4% decline in Cr(VI) removal after five cycles. This study offered evidence that mango kernel could be recycled as a beneficial resource to synthesize green nZVI-loaded biochar composite for efficient Cr(VI) elimination from water.

关键词: Synthesis, Biochar-supported nZVI, Hexavalent chromium, Reduction, Regeneration

Yuting Zhang, Yuwei Tang, Ruiping Yan, Shuang Liang, Zhongmou Liu, Yadong Yang. Green-synthesized, biochar-supported nZVI from mango kernel residue for aqueous hexavalent chromium removal: Performance, mechanism and regeneration[J]. Chinese Journal of Chemical Engineering, 2024, 71(7): 91-101.

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Green-synthesized, biochar-supported nZVI from mango kernel residue for aqueous hexavalent chromium removal: Performance, mechanism and regeneration

Green-synthesized, biochar-supported nZVI from mango kernel residue for aqueous hexavalent chromium removal: Performance, mechanism and regeneration

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