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 determ...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.展开更多
ZVI/nZVI凭借其优异的污染物去除性能以及在环境修复中的其他优点,引起了国内外研究人员的极大关注。基于中国知网和Web of Science核心合集数据库中英文文献数据,对国内外微生物协同零价铁(ZVI)/纳米零价铁(nZVI)的相关文献进行年代分...ZVI/nZVI凭借其优异的污染物去除性能以及在环境修复中的其他优点,引起了国内外研究人员的极大关注。基于中国知网和Web of Science核心合集数据库中英文文献数据,对国内外微生物协同零价铁(ZVI)/纳米零价铁(nZVI)的相关文献进行年代分布、期刊分布、关键词共现、时间演进及突现等方面的文献计量分析。结果显示,年度论文总数的增长趋势可分为3个阶段。中国是这一领域最活跃的国家,Journal of Hazardous Materials是出版物数量最多的期刊。有关ZVI与微生物的研究重点是甲烷生产、厌氧消化、脱氯作用;微生物协同nZVI的研究集中于微生物群落、修复、生物毒性、生物炭。关键词的时间演进图谱将其分为9种聚类,关键词的突现分析表明细胞分子水平的机理研究和零价铁生物毒性的创新可能是未来的研究方向。展开更多
Nanoscale zerovalent iron(nZVI)has garnered significant attention as an efficient advanced oxidation activator,but its practical application is hindered by aggregation and oxidation.Coating nZVI with carbon can effect...Nanoscale zerovalent iron(nZVI)has garnered significant attention as an efficient advanced oxidation activator,but its practical application is hindered by aggregation and oxidation.Coating nZVI with carbon can effectively addresses these issues.A simple and scalable production method for carbon-coated nZVI composite is highly desirable.The anti-oxidation and catalytic performance of carbon-coated nZVI composite merit in-depth research.In this study,a highly stable carbon-coated core-shell nZVI composite(Fe0@RF-C)was successfully prepared using a simple method combining phenolic resin embedding and carbothermal reduction.Fe0@RF-C was employed as a heterogeneous persulfate(PS)activator for degrading 2,4-dihydroxybenzophenone(BP-1),an emerging contaminant.Compared to commercial nZVI,Fe0@RF-C exhibited superior PS activation performance and oxidation resistance.Nearly 95%of BP-1 was removed within 10 min in the Fe0@RF-C/PS system.The carbon layer promotes the enrichment of BP-1 and accelerates its degradation through singlet oxygen oxidation and direct electron transfer processes.This study provides a straightforward approach for designing highly stable carbon-coated nZVI composite and elucidates the enhanced catalytic performance mechanism by carbon layers.展开更多
基金supported by the National Natural Science Foundation of China(51808253)the Science and Technology Planning Project of Jilin Province(20220508008RC)+1 种基金Science and Technology Project of Jilin Provincial Education Department(JJKH20220295KJ and JJKH20210272KJ)the Science and Technology Projects of the Ministry of Housing and Urban-Rural Development(2018-K6-003).
文摘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.
基金Projects(42077185,U22A20591)supported by the National Natural Science Foundation of China+5 种基金Projects(2022JDJQ0010,2022ZYD0040)supported by the Sichuan Science and Technology Program for Distinguished Young Scholars,ChinaProject(2020YFC1808300)supported by the National Key Research and Development Program of ChinaProject(SKLGP2020Z002)supported by the Research Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,China。
文摘ZVI/nZVI凭借其优异的污染物去除性能以及在环境修复中的其他优点,引起了国内外研究人员的极大关注。基于中国知网和Web of Science核心合集数据库中英文文献数据,对国内外微生物协同零价铁(ZVI)/纳米零价铁(nZVI)的相关文献进行年代分布、期刊分布、关键词共现、时间演进及突现等方面的文献计量分析。结果显示,年度论文总数的增长趋势可分为3个阶段。中国是这一领域最活跃的国家,Journal of Hazardous Materials是出版物数量最多的期刊。有关ZVI与微生物的研究重点是甲烷生产、厌氧消化、脱氯作用;微生物协同nZVI的研究集中于微生物群落、修复、生物毒性、生物炭。关键词的时间演进图谱将其分为9种聚类,关键词的突现分析表明细胞分子水平的机理研究和零价铁生物毒性的创新可能是未来的研究方向。
基金National Natural Science Foundation of China(52070094)project entrusted by Nanjing University&Yancheng Academy of Environment Protection Technology and Engineering(HX202112220004)First-class undergraduate course construction project and Student Innovation and Entrepreneurship Training program of Nanchang University(202210403102 and S202210403083).
文摘Nanoscale zerovalent iron(nZVI)has garnered significant attention as an efficient advanced oxidation activator,but its practical application is hindered by aggregation and oxidation.Coating nZVI with carbon can effectively addresses these issues.A simple and scalable production method for carbon-coated nZVI composite is highly desirable.The anti-oxidation and catalytic performance of carbon-coated nZVI composite merit in-depth research.In this study,a highly stable carbon-coated core-shell nZVI composite(Fe0@RF-C)was successfully prepared using a simple method combining phenolic resin embedding and carbothermal reduction.Fe0@RF-C was employed as a heterogeneous persulfate(PS)activator for degrading 2,4-dihydroxybenzophenone(BP-1),an emerging contaminant.Compared to commercial nZVI,Fe0@RF-C exhibited superior PS activation performance and oxidation resistance.Nearly 95%of BP-1 was removed within 10 min in the Fe0@RF-C/PS system.The carbon layer promotes the enrichment of BP-1 and accelerates its degradation through singlet oxygen oxidation and direct electron transfer processes.This study provides a straightforward approach for designing highly stable carbon-coated nZVI composite and elucidates the enhanced catalytic performance mechanism by carbon layers.
