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Enhanced removal of hexavalent chromium from aqueous media using a highly stable and magnetically separable rosin-biochar-coated TiO2@C nanocomposite†
RSC Advances ( IF 3.9 ) Pub Date : 2018-07-19 00:00:00 , DOI: 10.1039/c8ra02860e
Balal Yousaf 1, 2 , Guijian Liu 1, 2 , Qumber Abbas 1 , Ruwei Wang 2 , Habib Ullah 1 , Md Manik Mian 1 , Amina 3 , Audil Rashid 4
Affiliation  

Recently, nanosized metal-oxides have been extensively investigated for their ability to remove metal ions from aqueous media. However, the activity and capacity of these nanosized metal-oxides for removing metal ions decrease owing to their agglomeration in aqueous media. Herein, we synthesized a highly stable and magnetically separable rosin-biochar-coated (RBC) TiO2@C nanocomposite through a facile and environment-friendly wet chemical coating process, followed by a one-step heating route (pyrolysis) for efficient removal of Cr(VI) from aqueous solution. An array of techniques, namely, TEM, HRTEM, TEM-EDS, XRD, FTIR, VSM, BET and TGA, were used to characterize the prepared nanocomposite. The pyrolysis of rosin into biochar and the fabrication of Fe onto the RBC-TiO2@C nanocomposite were confirmed by FTIR and XRD examination, respectively. Moreover, TEM and HRTEM images and elemental mapping using TEM-EDS showed good dispersion of iron and carbon on the surface of the RBC-TiO2@C nanocomposite. Sorption of Cr(VI) ions on the surface of the RBC-TiO2@C nanocomposite was very fast and efficient, having a removal efficiency of ∼95% within the 1st minute of reaction. Furthermore, thermodynamic analysis showed negative values of Gibb's free energy at all five temperatures, indicating that the adsorption of Cr(VI) ions on the RBC-TiO2@C nanocomposite was favorable and spontaneous. Conclusively, our results indicate that the RBC-TiO2@C nanocomposite can be used for efficient removal of Cr(VI) from aqueous media due to its novel synthesis and extraordinary adsorption efficacy during a short time period.

中文翻译:

使用高度稳定和磁性可分离的松香-生物炭涂层的 TiO2@C 纳米复合材料增强从水介质中去除六​​价铬的能力†

最近,纳米金属氧化物因其从水介质中去除金属离子的能力而被广泛研究。然而,这些纳米级金属氧化物去除金属离子的活性和能力由于它们在水性介质中的团聚而降低。在此,我们通过简便且环保的湿化学涂层工艺合成了一种高度稳定且可磁分离的松香-生物炭涂层(RBC)TiO 2 @C 纳米复合材料,然后采用一步加热路线(热解)有效去除来自水溶液的Cr( VI )。一系列技术,即 TEM、HRTEM、TEM-EDS、XRD、FTIR、VSM、BET 和 TGA,用于表征制备的纳米复合材料。松香热解成生物炭并在RBC-TiO 2上制备Fe@C 纳米复合材料分别通过 FTIR 和 XRD 检测得到证实。此外,使用 TEM-EDS 的 TEM 和 HRTEM 图像以及元素映射显示了铁和碳在 RBC-TiO 2 @C 纳米复合材料表面上的良好分散。RBC-TiO 2 @C 纳米复合材料表面对Cr( VI ) 离子的吸附非常快速和有效,在反应的 1 分钟内去除效率约为 95 %。此外,热力学分析显示,在所有五个温度下,Gibb 自由能均为负值,表明 Cr( VI ) 离子在 RBC-TiO 2 @C 纳米复合材料上的吸附是有利且自发的。最后,我们的结果表明,RBC-TiO 2@C 纳米复合材料由于其新颖的合成方法和在短时间内非凡的吸附效率,可用于从水介质中有效去除 Cr( VI )。
更新日期:2018-07-19
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