Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2018-07-09 , DOI: 10.1016/j.micromeso.2018.07.016 Ruchi Mutneja , Neha Srivastav , Raghubir Singh , Varinder Kaur , Nadine Bette , Volker Klemm , David Rafaja , Jörg Wagler , Edwin Kroke
In the present work an azomethinic pincer (P) possessing an ONNNO donor set was prepared via condensation reaction of diethylenetriamine and o-hydroxyacetophenone followed by silyl-functionalization (introduction of a triethoxysilylpropyl or silatranylpropyl group via urea linker) to afford P-Sil and P-Silt, respectively. The resulting products were characterized by various spectroscopic techniques, elemental analysis and single-crystal X-ray diffraction. They were further utilized for the fabrication of post-synthesis functionalized mesoporous silica nanoparticles (MSNs) using similar reaction conditions. The obtained hybrid materials ([email protected] and [email protected]) were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetry (TGA), nitrogen gas adsorption-desorption measurements and C,H,N microanalysis. The corresponding results revealed particularly high loading of organic moieties for the P-Silt functionalized particles. In addition, adsorption behavior of both materials towards the anionic dye eriochrome black T (EBT) was evaluated by examining the effect of pH, solution temperature, time and dye concentration. The maximum adsorption capacity of [email protected] and [email protected] at pH = 3 was found to be 101 mg g−1 and 69.9 mg g−1, respectively (calculated on the basis of Langmuir model). The characterization and adsorption studies revealed better loading of organic moieties in [email protected] with respect to [email protected] Furthermore, [email protected] was used to adsorb the cationic dye methylene blue (MB) at pH = 8. Its maximum adsorption capacity reached 28 mg g−1.
中文翻译:
通过制备具有偶氮二甲钳用于染料吸附的功能化介孔二氧化硅,探索在作为共价接枝基团的三甲硅烷基基团作为锚定单元方面优于其三烷氧基甲硅烷基类似物的优势
在本工作中,通过二亚乙基三胺和邻羟基苯乙酮的缩合反应,然后进行甲硅烷基官能化(通过尿素连接基引入三乙氧基甲硅烷基丙基或甲硅烷基丙基),制得具有ONNNO供体的偶氮甲钳(P),得到P-Sil和P -淤泥, 分别。通过各种光谱技术,元素分析和单晶X射线衍射对所得产物进行表征。使用相似的反应条件,将它们进一步用于合成后功能化的介孔二氧化硅纳米粒子(MSN)的制备。通过扫描电子显微镜(SEM),透射电子显微镜(TEM),热重分析(TGA),氮气吸附-脱附测量以及C,H,N微观分析对获得的杂化材料([受电子邮件保护]和[受电子邮件保护])进行了表征。 。相应的结果表明,P-Silt的有机部分负载量特别高功能化的粒子。另外,通过检查pH,溶液温度,时间和染料浓度的影响,评估了两种材料对阴离子染料铬铁黑T(EBT)的吸附行为。发现在pH = 3下[受电子邮件保护的]和[受电子邮件保护的]的最大吸附容量分别为101mg g -1和69.9mg g -1(基于Langmuir模型计算)。表征和吸附研究表明,相对于[电子邮件保护],[电子邮件保护]中有机部分的负载更好。此外,[电子邮件保护]用于在pH = 8时吸附阳离子染料亚甲基蓝(MB)。其最大吸附容量达到28mg g -1。