A core-shell structure of polyaniline coated protonic titanate nanobelt composites for both Cr(VI) and humic acid removal
A core-shell structure of polyaniline coated protonic titanate nanobelt composites for both Cr(VI) and humic acid removal
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聚苯胺涂覆的质子钛酸盐纳米带复合材料的核壳结构，用于去除 Cr(VI) 和腐殖酸
DOI：
10.1039/c5py01721a
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发表时间：
2016
影响因子：
4.6
通讯作者：
Wang Xiangke
中科院分区：
文献类型：
--
作者：
Wen Tao;Fan Qiaohui;Tan Xiaoli;Chen Yuantao;Chen Changlun;Xu Anwu;Wang Xiangke
目前用于从废水中去除铬和天然有机物的方法存在局限性，例如成本高、重现性差、有害的环境影响以及二次废物。本文以植酸为催化剂，通过化学氧化法制备了核壳结构的聚苯胺/钛酸氢纳米带（PANI/H-TNB）复合材料。研究了PANI/H-TNB复合材料对水中Cr（VI）和腐殖酸（HA）的吸附性能。采用批式技术，研究了在不同环境条件下对Cr（VI）和HA的去除效率。PANI/H-TNB复合材料对Cr（VI）（156.94 mg g−1）和HA（339.46 mg g−1）表现出优异的吸附能力，优于PANI纳米线和许多其他材料。大的Kd值（>104 mL g−1）证明了复合材料对Cr（VI）和HA的高亲和力。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，Cr（VI）的去除是Cr（VI）还原为Cr（III）和化学吸附的综合作用，而HA的吸附主要是通过解离的HA大分子与带正电的PANI之间的表面络合作用进行的。PANI/H-TNB复合材料具有良好的再生性能和可重复使用性，大大降低了废水处理费用。从工业应用的角度来看，PANI/H-TNB复合材料具有较高的吸附容量，可以作为一种合适的吸附剂同时去除废水中的Cr（VI）和HA。
The current methods for chromium and natural organic matter decontamination from wastewater present limitations, such as high cost, poor reproducibility, and detrimental environmental effects as well as by secondary waste. Herein, we synthesized a core–shell structure of polyaniline/hydrogen-titanate nanobelt (PANI/H-TNB) composites through chemical oxidation in the presence of phytic acid, which played an important role in the formation and regeneration of PANI. The adsorption performance of PANI/H-TNB composites as an adsorbent of Cr(VI) and humic acid (HA) from aqueous solutions was tested. A batch technique was adopted to investigate the removal efficiency toward Cr(VI) and HA under various environmental conditions. The PANI/H-TNB composites exhibited excellent adsorption capacity toward Cr(VI) (156.94 mg g−1) and HA (339.46 mg g−1), outperforming that of PANI nanowires and many other materials. Large Kd values (>104 mL g−1) demonstrated the high affinity of the composites for both of Cr(VI) and HA. The analysis of Fourier transformed infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) showed that the removal of Cr(VI) was a combined effect of reduction Cr(VI) to Cr(III) and chemical sorption, while HA adsorption was mainly via surface complexation between the disassociated HA macromolecules and the positively charged PANI. The PANI/H-TNB composites presented satisfactory regeneration performance and reusability, which greatly reduced the wastewater disposal expenses. For the sake of industrial application, the PANI/H-TNB composites with high adsorption capacities can be applied as a suitable adsorbent for simultaneous removal of Cr(VI) and HA in wastewater cleanup.