A novel magnesium ascorbyl phosphate graphene-based monolith and its superior adsorption capability for bisphenol A
A novel magnesium ascorbyl phosphate graphene-based monolith and its superior adsorption capability for bisphenol A
复制标题
一种新型抗坏血酸磷酸镁石墨烯基整料及其对双酚A的卓越吸附能力
DOI：
10.1016/j.cej.2017.10.067
复制
发表时间：
2018-02-15
影响因子：
15.1
通讯作者：
Li, Huiqin
中科院分区：
文献类型：
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作者：
Fang, Zheng;Hu, Yongyou;Li, Huiqin
用抗坏血酸磷酸镁(MAP)还原氧化石墨烯(GO)制备了大比表面积无壳石墨烯基整体柱(GBM)，并用于吸附去除痕量双酚A(BPA)。用扫描电子显微镜(SEM)、比表面积(BET)、X射线粉末衍射、傅里叶变换红外光谱(FTIR)、拉曼光谱和X射线光电子能谱等手段对MAP-GBM的性能进行了表征。采用间歇和柱式吸附实验研究了双酚A的吸附性能。数据表明，MAP-GBM是一种具有宏观结构的三维(3D)石墨烯材料，大部分C=C双键被回收。BPA在MAP-GBM上的吸附等温线和吸附动力学分别符合Langmuir模型和准二级动力学模型，吸附过程为吸热过程。MAP-GBM对BPA的饱和吸附容量为324 mg/g，是抗坏血酸-GBM的2.43倍。MAP-GBM吸附柱在较低浓度(50微克/L)下可完全去除溶液中的双酚A，吸附时间接近450毫升。这一效率远高于传统的吸附剂如活性碳，这可以归因于这种MAP-GBM独特的3D孔道结构、氢键和pi-pi相互作用特性。该材料只需在甲醇中浸泡24 h即可再生，再生5次后仍能保持88%的吸附效率。这些发现表明，MAP-GBM是一种有效且经济高效地去除低浓度内分泌干扰化学物质的吸附剂。
In this study, a non-shell graphene-based monolith (GBM) with huge surface area was synthesized by chemical reduction of Graphene oxide (GO) using magnesium ascorbyl phosphate (MAP), and tested as an adsorbent for trace Bisphenol A (BPA) removal. The properties of MAP-GBM was characterized by scanning electron microscopy (SEM), Brunauer-Emmett-Teller N-2 specific surface area (BET), X-ray powder diffraction, Fourier transform-infrared (FTIR), Raman, and X-ray photoelectron spectroscopies. BPA adsorption was investigated in batch and column adsorption experiments. The data showed that MAP-GBM was a three-dimensional (3D) graphene material with macrostructure and most C=C double bonds were recovered. Adsorption isotherms and kinetics of BPA on MAP-GBM followed the Langmuir model and fitted well with a pseudo-second-order kinetic model, respectively, and the adsorption process was endothermic. The saturated adsorption capacity of MAP-GBM was 324 mg/g for BPA, which was 2.43 times of that of ascorbic acid-GBM. A MAP-GBM adsorption column completely removed BPA from solution at low concentration (50 mu g/L) for similar to 450 mL. This efficiency is much higher than traditional adsorbents such as activated carbon, which could be ascribed to the unique 3D porous structure, hydrogen bonding, and pi-pi interaction characteristics of this MAP-GBM. The material can be easily regenerated by simply immersing in methanol for 24 h, and the adsorption efficiency remain as high as 88% after five regenerations. These findings demonstrated that MAP-GBM is a promising adsorbent for the effective and cost-efficient removal of low concentration endocrine-disrupting chemicals.