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首页> 外文期刊>RSC Advances >Organically-modified magnesium silicate nanocomposites for high-performance heavy metal removal
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Organically-modified magnesium silicate nanocomposites for high-performance heavy metal removal

机译：有机改性的硅酸镁纳米复合材料，可去除高性能的重金属

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摘要

A disulfide-grafted polyethyleneimine (PES)@Mg2SiO4 composite was synthesized, characterized, and used successfully to remove heavy metals from wastewater. It was grafted with a huge number of dithiocarbamate moieties as sites for specific adsorption. By comparative studies, it was found that the morphology, structure and properties were influenced by the trapped organic components in the composites. PES@Mg2SiO4 exhibits a larger specific surface area and better adsorption activity compared with Mg2SiO4, polyethyleneimine (PEI)@Mg2SiO4 and PEI@Mg2SiO4-CS2. The adsorption behaviors of the obtained composites were investigated for the recovery of Hg2+, Pb2+ and Cd2+. PES@Mg2SiO4 shows the highest adsorption capacities of 714 mg g(-1) for Hg2+, 400 mg g(-1) for Pb2+ and 323 mg g(-1) for Cd2+, which fits the Langmuir isotherm model. Besides this, it also exhibits excellent adsorption capacity for Cu2+, Bi3+ and metal complexes. Its application in petrochemical wastewater demonstrates its enormous potential for heavy metal wastewater treatment.
机译：合成，表征了二硫化物接枝聚乙烯亚胺（PES）@ Mg2SiO4复合材料，并成功地用于去除废水中的重金属。它接枝了大量的二硫代氨基甲酸酯部分作为特定吸附位点。通过比较研究发现，形态，结构和性能受复合材料中捕获的有机成分的影响。与Mg2SiO4，聚乙烯亚胺（PEI）@ Mg2SiO4和PEI @ Mg2SiO4-CS2相比，PES @ Mg2SiO4具有更大的比表面积和更好的吸附活性。研究了所得复合材料对Hg2 +，Pb2 +和Cd2 +的吸附行为。 PES @ Mg2SiO4的最高吸附容量为Hg2 + 714 mg g（-1），Pb2 + 400 mg g（-1）和Cd2 + 323 mg g（-1），这符合Langmuir等温线模型。除此之外，它还对Cu2 +，Bi3 +和金属络合物具有出色的吸附能力。它在石化废水中的应用证明了其在重金属废水处理中的巨大潜力。

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