Synergistic removal of Pb(II), Cd(II) and humic acid by Fe3O4@mesoporous silica-graphene oxide composites.
Synergistic removal of Pb(II), Cd(II) and humic acid by Fe3O4@mesoporous silica-graphene oxide composites.
复制标题
Fe3O4@介孔二氧化硅-氧化石墨烯复合材料协同去除Pb(II)、Cd(II)和腐殖酸
DOI：
10.1371/journal.pone.0065634
复制
发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Tang Y
中科院分区：
文献类型：
--
作者：
Wang Y;Liang S;Chen B;Guo F;Yu S;Tang Y
重金属离子和腐殖酸的协同吸附可能非常具有挑战性。这在很大程度上是因为它们在大多数吸附剂材料上的竞争吸附。本文制备了含有聚乙烯亚胺改性的磁性介孔二氧化硅和氧化石墨烯（MMSP-GO）的分级结构复合材料以解决这一问题。合成了磁性介孔二氧化硅微球，并将其与PEI分子功能化，提供了许多胺基与GO片上的羧基进行化学缀合，增强了污染物与介孔二氧化硅之间的亲和力。采用TEM、SEM、TGA、DLS和VSM等测试手段对复合材料的性能进行了表征。系列吸附实验结果表明，MMSP-GO复合吸附剂能够同时有效去除水中的重金属离子和腐殖酸。用Langmuir模型计算得到MMSP-GO对Pb（II）和Cd（II）的最大吸附容量分别为333和167 mg g−1。HA增强了MMSP-GO复合材料对重金属的吸附，这是由于它们在水溶液中的相互作用。探讨了腐殖酸与重金属离子协同吸附的机理。MMSP-GO复合材料已显示出作为吸附剂在废水处理过程中同时去除重金属和腐殖酸的前景。
The synergistic adsorption of heavy metal ions and humic acid can be very challenging. This is largely because of their competitive adsorption onto most adsorbent materials. Hierarchically structured composites containing polyethylenimine-modified magnetic mesoporous silica and graphene oxide (MMSP-GO) were here prepared to address this. Magnetic mesoporous silica microspheres were synthesized and functionalized with PEI molecules, providing many amine groups for chemical conjugation with the carboxyl groups on GO sheets and enhanced the affinity between the pollutants and the mesoporous silica. The features of the composites were characterized using TEM, SEM, TGA, DLS, and VSM measurements. Series adsorption results proved that this system was suitable for simultaneous and efficient removal of heavy metal ions and humic acid using MMSP-GO composites as adsorbents. The maximum adsorption capacities of MMSP-GO for Pb(II) and Cd (II) were 333 and 167 mg g−1 caculated by Langmuir model, respectively. HA enhances adsorption of heavy metals by MMSP-GO composites due to their interactions in aqueous solutions. The underlying mechanism of synergistic adsorption of heavy metal ions and humic acid were discussed. MMSP-GO composites have shown promise for use as adsorbents in the simultaneous removal of heavy metals and humic acid in wastewater treatment processes.
登录
查看更多内容
PEI接枝磁性多孔粉高效吸附重金属离子
影响因子：
9.9
作者：
Pang, Ya;Zeng, Guangming;Xie, Gengxin
通讯作者：
Xie, Gengxin
腐植酸包覆二氧化钛对镉(II)的吸附
影响因子：
9.9
作者：
Chen, Qiqing;Yin, Daqiang;Hu, Xialin
通讯作者：
Hu, Xialin
影响因子：
3.7
作者：
Chen, Xinqing;Lam, Koon Fung;Yeung, King Lun
通讯作者：
Yeung, King Lun
影响因子：
4.9
作者：
Liu, AM;Hidajat, K;Zhao, DY
通讯作者：
Zhao, DY
胺功能化磁性介孔复合微球对腐植酸的增强吸附
DOI：
10.1016/j.colsurfa.2012.04.050
发表时间：
2012-07-20
影响因子：
5.2
作者：
Tang, Yulin;Liang, Song;Wang, Yilong
通讯作者：
Wang, Yilong