摘要
将核桃壳负载纳米零价铁制备核桃壳生物质负载纳米零价铁复合材料(WSP@nZVI),投加到Cr(Ⅵ)污染土壤中,通过土壤钝化实验,研究投加量、土水比和时间对Cr(Ⅵ)污染土壤的修复效果的影响,并探究可能的修复机理。分析处理前后土壤浸出液Cr(Ⅵ)浓度、土壤Cr(Ⅵ)含量、土壤总Cr含量以及土壤Cr形态含量的变化。结果表明,在投加量为7.5 mg/g,土水比为1∶10 g/mL,时间为2 d时,修复效果最佳。投加量越大,土水比越小,时间越长,修复效果越明显。其修复机制可能为吸附-还原-沉淀与共沉淀3种机理协同作用。
The process and mechanism of remediation of Cr(Ⅵ)contaminated soil by walnut shell biomass loaded nano zero valent iron composite were studied.Through soil passivation experiment,the effects of dosage,soil water ratio and time on the remediation effect of Cr(Ⅵ)contaminated soil were studied,and the possible remediation mechanism was explored.The changes of Cr(Ⅵ)concentration in soil extract,Cr(Ⅵ)content in soil,total Cr content in soil and Cr form content in soil before and after treatment were analyzed.The result showed that when the dosage is 7.5 mg/g,the soil water ratio is 1∶10 g/mL,and the time is 2 d,the repair effect is the best.The greater the dosage,the smaller the soil water ratio,and the longer the time,the more obvious the repair effect.The mechanism of remediation may be the synergism of adsorption reduction precipitation and coprecipitation.
作者
鲁秀国
陈晶
官伟
LU Xiu-guo;CHEN Jing;GUAN Wei(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《应用化工》
CAS
CSCD
北大核心
2023年第6期1669-1674,共6页
Applied Chemical Industry
基金
国家自然科学基金(51768018)。
关键词
核桃壳生物质
纳米零价铁改性
Cr(Ⅵ)
土壤
修复机理
walnut shell biomass
modification of nano zero valent iron
Cr(Ⅵ)
soil
remediation mechanism
