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 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.
基金项目
National Natural Science Foundation of China(51808253)
Science and Technology Planning Project of Jilin Province(20220508008RC)
Science and Technology Project of Jilin Provincial Education Department(JJKH20220295KJ)
Science and Technology Project of Jilin Provincial Education Department(JJKH20210272KJ)
Science and Technology Projects of the Ministry of Housing and Urban-Rural Development(2018-K6-003)
万方数据