Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran.
Department of Chemistry, University of Isfahan, Isfahan, Iran.
Chemosphere. 2020 Jan;239:124735. doi: 10.1016/j.chemosphere.2019.124735. Epub 2019 Aug 31.
A key challenge in adsorption process of toxic organic and inorganic species is the design and development of adsorbent materials bearing an abundance of accessible adsorption sites with high affinity to achieve both fast adsorption kinetics and elevated adsorption capacity for toxic contaminants. Herein, a novel anion-exchange adsorbent based on fibrous silica nanospheres KCC-1 was synthesized by a facile hydrothermal-assisted post-grafting modification of KCC-1 with 1-methyl-3- (triethoxysilylpropyl)imidazolium chloride for the first time. Silica fibers with micro-mesoporous structure display the proper combination of features to serve as a potential scaffold for decorating adsorption sites to create desired ion-exchange adsorbent. The obtained N-methylimidazolium-functionalized KCC-1 (MI-Cl-KCC-1) with fibrous nanosphere morphology showed a high surface area (∼241 m g) and high pore volume (0.81 m g). The adsorption behaviors of toxic hexavalent chromium from aqueous media by the MI-Cl-KCC-1 were systematically studied using the batch method. The adsorption rate was relatively fast, and MI-Cl-KCC-1 possesses a high capacity for the adsorption of Cr(VI). The maximum Cr(VI) adsorption was obtained at pH 3.0-4.0. Different non-linear isotherm equations were tested for choosing an appropriate adorption isotherm behavior, and the adsorption data for MI-Cl-KCC-1 were consistent with the Langmuir model with a maximum adsorption capacity of 428 ± 8 mg g.
一种有毒有机和无机物种吸附过程中的关键挑战是设计和开发具有丰富可及吸附位点的吸附剂材料，这些吸附位点具有高亲和力，以实现快速吸附动力学和对有毒污染物的高吸附容量。在此，首次通过简便的水热辅助后接枝改性 KCC-1，用 1-甲基-3-（三乙氧基硅基）丙基咪唑氯盐合成了一种基于纤维状硅纳米球 KCC-1 的新型阴离子交换吸附剂。具有微介孔结构的硅纤维具有适当的组合特征，可用作修饰吸附位点的潜在支架，以创造所需的离子交换吸附剂。所得的纤维状纳米球形态的 N-甲基咪唑基功能化 KCC-1（MI-Cl-KCC-1）具有高比表面积（约 241 m²/g）和高孔体积（0.81 m²/g）。采用批量法系统研究了 MI-Cl-KCC-1 从水溶液中吸附有毒六价铬的行为。吸附速率相对较快，且 MI-Cl-KCC-1 对 Cr(VI) 的吸附容量较高。最大 Cr(VI)吸附在 pH 3.0-4.0 时获得。测试了不同的非线性等温方程以选择合适的吸附等温线行为，且 MI-Cl-KCC-1 的吸附数据与 Langmuir 模型一致，最大吸附容量为 428±8 mg/g。
