Wang Liyan, Jia Bojie, Teng Zedong, Cao Hao, Miao Yanli, Guo Huiyuan, Li Tinggang
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, 100083, China.
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, 100083, China; CAS Key Laboratory of Green Process and Engineering, Beijing Engineering Research Centre of Process Pollution Control, National Engineering Research Center of Green, Recycling for Strategic Metal Resources, Innovation Academy for Green Manufacture, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
Chemosphere. 2024 Jul;359:142340. doi: 10.1016/j.chemosphere.2024.142340. Epub 2024 May 14.
The bioaccumulation and toxicity of heavy metals are serious threats to human activities and ecological health. The exploitation of environmentally friendly passivated materials is major importance for the remediation of heavy metal contaminated soil. This research developed a new type of environmental functional material with a core-shell structure, which is an iron-based material functionalized with phosphorus and carbon from sludge for heavy metal pollution remediation. The results indicated that the C/P@Fe exhibits excellent heavy metal removal ability, and the maximum removal rates of the two heavy metals in simulated wastewater could reach 100% under optimum reaction conditions. It also effectively converts the labile Cr/Pb into the stable fraction after 28 days of incubation, which increased the maximum residual fraction percentage of Cr and Pb by 32.43% and 160% in soil. Further analysis found that the carbon layer wrapped around the iron base could improve the electron transport efficiency of reducing iron, phosphorus and ferrum could react with heavy metal ions to form stable minerals, such as FeCrO, FeO·CrO, Pb(PO)OH, PbCO, 2PbCO·Pb(OH) and PbS, after reacting with C/P@Fe. The study demonstrated that the Iron-based materials functionalized with carbon and phosphorus from sludge provided a more efficient way to remove heavy metals.
重金属的生物累积和毒性对人类活动和生态健康构成严重威胁。开发环境友好型钝化材料对于修复重金属污染土壤至关重要。本研究开发了一种新型的具有核壳结构的环境功能材料，它是一种用污泥中的磷和碳功能化的铁基材料，用于重金属污染修复。结果表明，C/P@Fe表现出优异的重金属去除能力，在最佳反应条件下，模拟废水中两种重金属的最大去除率可达100%。在培养28天后，它还能有效地将不稳定的Cr/Pb转化为稳定形态，这使得土壤中Cr和Pb的最大残留形态百分比分别提高了32.43%和160%。进一步分析发现，包裹在铁基周围的碳层可以提高还原铁的电子传输效率，磷和铁与重金属离子反应形成稳定的矿物，如FeCrO、FeO·CrO、Pb(PO)OH、PbCO、2PbCO·Pb(OH)和PbS，这些矿物是在与C/P@Fe反应后形成的。该研究表明，用污泥中的碳和磷功能化的铁基材料为去除重金属提供了一种更有效的方法。
