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

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外文摘要：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 elec-trostatic 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.

外文关键词：

SynthesisBiochar-supported nZVIHexavalent chromiumReductionRegeneration

作者：

Yuting Zhang、Yuwei Tang、Ruiping Yan、Shuang Liang、Zhongmou Liu、Yadong Yang

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作者单位：

Key Laboratory of Songliao Aquatic Environment,Ministry of Education,Jilin Jianzhu University,Changchun 130118,China

School of Environmental Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China

基金：

National Natural Science Foundation of ChinaScience and Technology Planning Project of Jilin ProvinceScience and Technology Project of Jilin Provincial Education DepartmentScience and Technology Project of Jilin Provincial Education DepartmentScience and Technology Projects of the Ministry of Housing and Urban-Rural Development

项目编号：

5180825320220508008RCJJKH20220295KJJJKH20210272KJ2018-K6-003

出版年：

2024

DOI：

10.1016/j.cjche.2024.04.009

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

年,卷(期)：2024.71(7)