氧化石墨烯/还原氧化石墨烯包裹大象草二氧化硅纳米管及其在水介质中磺胺甲恶唑的修复中的应用,ACS Sustainable Chemistry & Engineering

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氧化石墨烯/还原氧化石墨烯包裹大象草二氧化硅纳米管及其在水介质中磺胺甲恶唑的修复中的应用
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-02-14 00:00:00 , DOI: 10.1021/acssuschemeng.7b02861
Samson O. Akpotu ₁ , Brenda Moodley ₁

Affiliation

已经建立了在低成本载体上引入石墨烯/氧化石墨烯以改善吸附性能的方法。这项研究报告了从象草中合成二氧化硅纳米管（SNT），其被还原的氧化石墨烯（RGO）/氧化石墨烯（GO）包裹的方法及其在污水中磺胺甲恶唑的高效吸附剂中的应用。合成SNT并用GO和RGO包封，分别得到二氧化硅纳米管氧化石墨烯（SNTGO）和二氧化硅纳米管还原氧化石墨烯（SNTG）。用FTIR，CHN元素分析，热重分析，XRD，场发射扫描电子显微镜和透射电子显微镜对吸附剂进行表征。FTIR，元素分析和XRD结果证实了材料的成功合成。SNTGO的吸附容量为125 mg / g，当在磺胺甲恶唑的吸附过程中还原为SNTG时，吸附容量增加至248 mg / g。拟二级模型最能描述吸附动力学，而Freundlich等温线最适合平衡数据。热力学研究表明吸附过程是自发的并且放热的。解吸研究表明，该吸附剂可以再生并重新用于磺胺甲恶唑的吸附。与SNTGO相比，SNTG在废水处理方面是一种更好的吸附剂。热力学研究表明吸附过程是自发的并且放热的。解吸研究表明，该吸附剂可以再生并重新用于磺胺甲恶唑的吸附。与SNTGO相比，SNTG在废水处理方面是一种更好的吸附剂。热力学研究表明吸附过程是自发的并且放热的。解吸研究表明，该吸附剂可以再生并重新用于磺胺甲恶唑的吸附。与SNTGO相比，SNTG在废水处理方面是一种更好的吸附剂。

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Encapsulation of Silica Nanotubes from Elephant Grass with Graphene Oxide/Reduced Graphene Oxide and Its Application in Remediation of Sulfamethoxazole from Aqueous Media

Incorporation of graphene/graphene oxide on a low-cost support has been established to improve adsorption performance. This study reports the synthesis of silica nanotubes (SNT) from elephant grass, its encapsulation by reduced graphene oxide (RGO)/graphene oxide (GO) and its application as a highly efficient adsorbent for the remediation of sulfamethoxazole from wastewater. The SNT was synthesized and encapsulated with GO and RGO, to obtain silica nanotubes graphene oxide (SNTGO) and silica nanotubes reduced graphene oxide (SNTG), respectively. The adsorbents were characterized with FTIR, CHN elemental analysis, thermogravimetric analysis, XRD, field emission scanning electron microscopy, and transmission electron microscopy. The FTIR, elemental analysis, and XRD results confirmed successful synthesis of the materials. SNTGO had an adsorption capacity of 125 mg/g, which increased to 248 mg/g when it was reduced to SNTG in the adsorption of sulfamethoxazole. The pseudo-second-order model best described the adsorption kinetics and the Freundlich isotherm was best fit for the equilibrium data. Thermodynamic studies showed the adsorption process was spontaneous and exothermic. The desorption studies revealed that the adsorbent could be regenerated and reused in the adsorption of sulfamethoxazole. SNTG was a better adsorbent compared to SNTGO for wastewater remediation.

更新日期：2018-02-14

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