沸石咪唑盐骨架
吸附
咪唑酯
催化作用
纳米纤维素
纤维素
化学工程
金属有机骨架
无机化学
材料科学
水溶液
化学
混合材料
介孔材料
吸附
环境修复
沸石
光催化
地下水修复
作者
Hani Nasser Abdelhamid,Aji P. Mathew
标识
DOI:10.1016/j.cej.2021.131733
摘要
• Nanocellulose-Zeolitic Imidazolate framework hybrids were synthesized in aqueous medium. • Hierarchical porous structure containing micropore, mesopore, and macropore was achieved. • Multifunctional applications such as adsorption of metals, dyes, and CO 2 and catalytic hydrogenation were demonstrated. The crystal growth of zeolitic imidazolate frameworks (ZIFs) on biopolymers such as cellulose is a promising method for obtaining hybrid materials that combinenatural and synthetic materials. Cellulose derivative viz. 2,2,6,6‐tetramethylpiperidine‐1‐oxylradical (TEMPO)-mediated oxidized nanocellulose (TOCNF) was used to modulate the crystal growth of ZIF-8 (denoted as CelloZIF-8) and ZIF-L (CelloZIF-L). The synthesis procedure occurred in water at room temperature with and without NaOH. The reaction parameters such as the sequence of the chemical's addition and reactant molar ratio were investigated. The phases formed during the crystal growth were monitored. The data analysis ensured the presence of zinc hydroxide nitrate nanosheets modified TOCNF during the crystallization of CelloZIFs. These phases were converted to pure phases ofCelloZIF-8 and CelloZIF-L. The resultant CelloZIFs materials were used for the adsorption ofcarbon dioxide (CO 2 ), metal ions, and dyes. The materials exhibited high selectivity with reasonable efficiency (100%) toward the adsorption of anionic dyes such as methyl blue (MeB). They can also be used as a catalyst for dye degradation via hydrogenation with an efficiency of 100%. CelloZIF crystals can be loaded into a filter paper for simple, fast, and selective adsorption of MeB from a dye mixture. The materials are recyclable for five cycles without significant loss of their performance. The mechanisms of adsorption and catalysis were also investigated.
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