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Organically-modified magnesium silicate nanocomposites for high-performance heavy metal removal

机译:有机改性镁硅酸镁纳米复合材料,用于高性能重金属去除

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A disulfide-grafted polyethyleneimine (PES)@Mg _(2) SiO _(4) 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@Mg _(2) SiO _(4) exhibits a larger specific surface area and better adsorption activity compared with Mg _(2) SiO _(4) , polyethyleneimine (PEI)@Mg _(2) SiO _(4) and PEI@Mg _(2) SiO _(4) –CS _(2) . The adsorption behaviors of the obtained composites were investigated for the recovery of Hg ~(2+) , Pb ~(2+) and Cd ~(2+) . PES@Mg _(2) SiO _(4) shows the highest adsorption capacities of 714 mg g ~(?1) for Hg ~(2+) , 400 mg g ~(?1) for Pb ~(2+) and 323 mg g ~(?1) for Cd ~(2+) , which fits the Langmuir isotherm model. Besides this, it also exhibits excellent adsorption capacity for Cu ~(2+) , Bi ~(3+) and metal complexes. Its application in petrochemical wastewater demonstrates its enormous potential for heavy metal wastewater treatment.
机译:合成,表征二硫化物接枝的聚乙烯亚胺(PES)@Mg _(2)SiO_(4)复合材料,并成功地使用废水中的重金属。它与大量的二硫代氨基甲酸酯部分作为特异性吸附的部位接枝。通过比较研究,发现形态,结构和性质受复合材料中捕获的有机组分的影响。 PES @ Mg _(2)SiO_(4)与Mg _(2)SiO_(4),聚乙烯亚胺(PEI)@mg _(2)SIO_(4)相比,表现出较大的比表面积和更好的吸附活性。和pei @ mg _(2)sio _(4)-cs _(2)。研究了所得复合材料的吸附行为,用于回收Hg〜(2+),Pb〜(2+)和Cd〜(2+)。 PES @ Mg _(2)SIO_(4)显示HG〜(2+),400mg g〜(α1)的714 mg g〜(α1)的最高吸附容量,用于Pb〜(2+)和CD〜(2+)的323mg g〜(α1),适合Langmuir等温模型。除此之外,它还表现出优异的Cu〜(2+),Bi〜(3+)和金属配合物的吸附能力。其在石化废水中的应用展示了重金属废水处理的巨大潜力。

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