Removal of Cu(II) and Fulvic Acid by Graphene Oxide Nanosheets Decorated with Fe3O4 Nanoparticles
Removal of Cu(II) and Fulvic Acid by Graphene Oxide Nanosheets Decorated with Fe3O4 Nanoparticles
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用 Fe3O4 纳米颗粒装饰的氧化石墨烯纳米片去除 Cu(II) 和黄腐酸。
DOI：
10.1021/am301358b
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发表时间：
2012-09-01
影响因子：
9.5
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
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作者：
Li, Jie;Zhang, Shouwei;Wang, Xiangke
制备了氧化石墨烯/Fe（3）O（4）（GO/Fe（3）O（4））复合材料，并用扫描电镜、透射电镜和X射线光电子能谱对其进行了表征。研究了GO/Fe（3）O（4）对Cu（II）和天然有机高分子富里酸（FA）的去除效果。考察了FA/Cu（II）对GO/Fe（3）O（4）吸附Cu（II）和FA的相互影响，以及pH、离子强度、FA/Cu（II）浓度和FA/Cu（II）添加顺序的影响。结果表明，Cu（II）在GO/Fe（3）O（4）上的吸附强烈地依赖于pH值，而不受离子强度的影响，表明吸附主要以内层表面络合为主，而不是外层表面络合或离子交换。FA的存在导致Cu（II）的吸附在低pH值和高pH值下的减少强烈增加，而Cu（II）的存在导致FA吸附的增加。吸附的FA有助于吸附剂表面性质的修改和部分络合的Cu（II）与FA吸附。FA/Cu（II）浓度和添加顺序对Cu（II）和FA吸附的不同影响进行了观察，表明吸附机制的差异。在pH 5.3时，GO/Fe 3 O 4吸附FA后，对Cu（II）的吸附量增加，吸附FA后，GO/Fe 3 O 4对Cu（II）的吸附量也增加。这些结果对评价和优化GO/Fe（3）O（4）复合材料对金属离子和有机物的去除具有重要意义。
Graphene oxide/Fe(3)O(4) (GO/Fe(3)O(4)) composites were synthesized and characterized by scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The removal of Cu(II) and a natural organic macromolecule (fulvic acid (FA)) by GO/Fe(3)O(4) was investigated. The mutual effects of FA/Cu(II) on Cu(II) and FA sorption onto GO/Fe(3)O(4), as well as the effect of pH, ionic strength, FA/Cu(II) concentrations, and the addition sequences of FA/Cu(II) were examined. The results indicated that Cu(II) sorption on GO/Fe(3)O(4) were strongly dependent on pH and independent of ionic strength, indicating that the sorption was mainly dominated by inner-sphere surface complexation rather than outer-sphere surface complexation or ion exchange. The presence of FA leads to a strong increase in Cu(II) sorption at low pH and a decrease at high pH, whereas the presence of Cu(II) led to an increase in FA sorption. The adsorbed FA contributes to the modification of sorbent surface properties and partial complexation of Cu(II) with FA adsorbed. Different effects of FA/Cu(II) concentrations and addition sequences on Cu(II) and FA sorption were observed, indicating the difference in sorption mechanisms. After GO/Fe(3)O(4) adsorbed FA, the sorption capacity for Cu(II) was enhanced at pH 5.3, and the sorption capacity for FA was also enhanced after Cu(II) sorption on GO/Fe(3)O(4). These results are important for estimating and optimizing the removal of metal ions and organic substances by GO/Fe(3)O(4) composites.