查找使用阿拉丁产品的科研文献

Effective adsorption of arsenate, dyes and eugenol from aqueous solutions by cationic supramolecular gel materials

Zujin Yang,Guifang Wu,Cui Gan,Guangmei Cai,Jianyong Zhang,Hongbing Ji

Developing efficient separation technologies for wastewater treatment and recovery of natural products is crucial in practical application. Covalent capture of supramolecular gel materials and the further surface modification benefit for the improvement in adsorption performance. In the present paper, two kinds of supramolecular gels, N , N ', N ”-(3-methylpyridine) benzenetriamide (TMPTA) nanotube and N , N ', N ”-(3-pyridyl) benzenetriamide (TPTA) nanofiber, were synthesized successfully by supramolecular self-assembly of tripodal pyridines and then were further modified with α,α'-dibromo-p-xylene to obtain imidazolium-based gel materials, TMPTA-G-M and TPTA-G-M. They have stable porous structure and positively charged surfaces with different morphologies. The synthesized gels are characterized by physico-chemical techniques, and the results show that the modification process does not cause significant changes in the morphology. TMPTA-G-M and TPTA-G-M are applied as adsorbents for the selective separation of anionic Congo Red (CR) and cationic dye Rhodamine B (RhB) from aqueous solutions. Maximum adsorption amounts ( q max ) on TPTA-G-M are 87.95 mg/g for CR and 85.83 mg/g for RB, and on TMPTA-G-M are 372.03 mg/g for CR and 45.64 mg/g for RB, respectively. For the arsenate adsorption, TMPTA-G-M showed significantly better adsorption performance with q max of 66.5 mg/g in solutions at pH = 9 in 10 min. Additionally, TMPTA-G-M is used for the selective separation of eugenol from eugenol acetate which coexist extensively in Clove oil , and it shows excellent adsorption selectivity for eugenol with q max of 93.59 mg/g at pH = 11. The mechanism study suggests that the morphology of the gels affects the distribution of charge and further affects the adsorption performance. And the adsorption may involve electrostatic interactions between adsorbent and adsorbate. The results indicate high adsorption ability and regeneration efficiency for TMPTA-G-M, implying the potential application in wastewater treatment and separation of natural product.