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从生物炭支持的纳米级零价值铁复合材料中从土壤中去除Pb (ii) 的机制

Shuxian Wei¹, Gang Du¹, Canhua Li^1,2

¹School of Metallurgical Engineering, Anhui University of Technology Ma'anshan Anhui 243002 China wsx1983246954@163.com licanhua1979@163.com +8618162347179.

|June 10, 2024

概括

一种新型的磁性生物碳复合物 (BC-nZVI) 有效地从水中去除 (Pb(ii)). 这种环保材料为重金属污染的补救提供了具有成本效益的解决方案.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
化学化学化学

背景情况:

重金属污染,特别是 (Pb) 的污染,对水质和生态系统构成重大威胁.
来自生物质的生物炭以其多孔结构和吸附能力而闻名,使其成为一个有前途的环境吸附剂.
纳米零价值铁 (nZVI) 在污染物修复方面是有效的,但其实际应用可能受到聚合和回收挑战的限制.

研究的目的:

开发一种新的磁性板状生物炭加载纳米零价值铁 (BC-nZVI) 复合材料.
研究BC-nZVI在从水溶液中去除Pb(ii) 的效率.
描述材料的特性,并了解Pb的吸附机制.

主要方法:

通过风湿相反应制备BC-nZVI复合物.
使用HRTEM,XPS,FESEM,EDS,XRD,FTIR和RAMAN进行材料属性的表征.
批量实验以评估Pb的消除效率在不同的条件下 (pH,温度,土壤水比,初始度).

主要成果:

在去除Pb的过程中,BC-nZVI表现出高效率,在120分钟内将30毫克L-1的初始度降低到微量水平.
最佳的去除条件是pH值为6,温度为20°C,土壤水比为 1:5,BC-nZVI剂量为1gL-1.1.
吸附动力学遵循了准二阶模型,异热量与兰迈尔模型对齐,表明化学吸附. 热力学分析证实了自发吸附.

结论:

开发的BC-nZVI复合物是一种具有成本效益,环保和高效的吸附剂,用于Pb(ii) 清除.
该材料的磁性特性使其易于回收和重复使用,提高了其实际适用性.
BC-nZVI显示了通过吸附共沉来修复污染的水和地点的巨大潜力.

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