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Chemical Modification Of Silica-gel With Diethylenetriamine Via An End-group Protection Approach For Adsorption To Hg(ii)

机译:通过端基保护法吸附二甲基三胺对硅胶进行化学修饰以吸附Hg(ii)

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摘要

Four kinds of silica-gel supported diethylenetriamine adsorbents with different structures, were prepared by so-called "heterogeneous-direct-amination" (hetero-DA), "homogeneous-direct-amina-tion" (homo-DA), "heterogeneous end-group protection" (hetero-EGP), and "homogeneous end-group protection" (homo-EGP) methods, respectively. The obtained products were named SG-HE-dD, SG-HO-dD, SG-HE-pD and SG-HO-pD, respectively (where SG means silica-gel; HE means heterogeneous, HO means homogeneous, d means direct, p means protected and D means diethylenetriamine). Their structures were characterized by FT-1R, elemental analysis, porous structure analysis and thermo-gravimetric analysis. The adsorption capabilities of such adsorbents towards Hg(II) were studied and evaluated by static method. SG-HE-pD and SG-HO-pD showed higher performance towards Hg(II) adsorption than corresponding counterparts SG-HE-dD and SG-HO-dD, even though the former two possessed lower contents of diethylenetriamine (DETA). The kinetics data indicated that the adsorption process was governed by the film diffusion and followed pseudo-first-order rate model for SG-HE-dD, SG-HO-dD and SG-HE-pD and pseudo-second-order model for SG-HO-pD. The Langmuir model was applied to fit the experimental equilibrium data for all adsorbents. The end-group protection method exhibited its advantage in preparation of effective adsorbent for metal ions uptake compared to the direct-amination method.
机译:通过所谓的“异质直接胺化”(hetero-DA),“均质直接胺化”(homo-DA),“异质端”制备了四种结构不同的硅胶负载的二亚乙基三胺吸附剂。组保护”(hetero-EGP)和“均质端基保护”(homo-EGP)方法。所得产物分别命名为SG-HE-dD,SG-HO-dD,SG-HE-pD和SG-HO-pD(其中SG表示硅胶; HE表示异质; HO表示均质; d表示直接; p表示被保护,D表示二亚乙基三胺)。通过FT-1R,元素分析,多孔结构分析和热重分析对其结构进行了表征。通过静态方法研究和评价了此类吸附剂对汞(II)的吸附能力。 SG-HE-pD和SG-HO-pD对Hg(II)的吸附表现出比相应的SG-HE-dD和SG-HO-dD更高的吸附性能,即使前两者的二亚乙基三胺(DETA)含量较低。动力学数据表明,吸附过程受膜扩散控制,SG-HE-dD,SG-HO-dD和SG-HE-pD遵循伪一级速率模型,SG遵循伪二级模型。 -HO-PD。应用Langmuir模型拟合所有吸附剂的实验平衡数据。与直接胺化方法相比,端基保护方法在制备用于吸收金属离子的有效吸附剂方面显示出其优势。

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