Efficient adsorption of azo anionic dye Congo Red by micro-nano metal-organic framework MIL-68(Fe) and MIL-68(Fe)/chitosan composite sponge: Preparation, characterization and adsorption performance

被引：31
作者：
Jin, Yonghui [1 ]
Liu, Fan [3 ]
Li, Yanhui [1 ,2 ]
Du, Qiuju [2 ]
Song, Fengling [4 ]
Chen, Bing [1 ]
Chen, Kewei [1 ]
Zhang, Yang [1 ]
Wang, Mingzhen [1 ]
Sun, Yaohui [1 ]
Zhao, Shiyong [1 ]
Jing, Zhenyu [1 ]
Pi, Xinxin [1 ]
Wang, YuQi [1 ]
Wang, Dechang [1 ]
机构：
[1] Qingdao Univ, Coll Mech & Elect Engn, 308 Ningxia Rd, Qingdao 266071, Peoples R China
[2] Qingdao Univ, State Key Lab Biopolysaccharide Fiber Forming & Ec, 308 Ningxia Rd, Qingdao 266071, Peoples R China
[3] Qingdao Univ, Normal Coll, 308 Ningxia Rd, Qingdao 266071, Peoples R China
[4] Shandong Univ, Inst Mol Sci & Engn, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Peoples R China
来源：
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES | 2023年 / 252卷
基金：
中国国家自然科学基金;
关键词：
MIL-68(Fe); Composite sponge; Adsorption; AQUEOUS-SOLUTION; ENHANCED ADSORPTION; SURFACE-AREA; REMOVAL; SILICA; NANOCOMPOSITES; ADSORBENTS; CAPACITY; CHITOSAN; CR(VI);
D O I：
10.1016/j.ijbiomac.2023.126198
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Micro-nano metal-organic framework (MIL-68(Fe)) for efficient adsorption of azo anionic dye Congo red (CR) was successfully prepared by one-step hydrothermal method under acidic environment. And a MIL-68(Fe)/ chitosan composite sponge (MIL-68(Fe)/CS) was prepared under the coating of chitosan (CS). After comparing the performance of MIL-68(Fe) and MIL-68(Fe)/CS, we focus on exploring MIL-68(Fe)/CS. It ensured the CR removal efficiency while reaching the adsorption equilibrium faster than MIL-68(Fe), and solved the defect that the powder was difficult to be stripped by water after adsorption. The physicochemical properties and surface morphology of the adsorbent were characterized by SEM, FTIR, XRD, TGA, BET, and Zeta potential. The effects of pH, contact time, adsorbent dosage, initial solution concentration and temperature on the adsorption performance of the adsorbent were systematically analyzed. The pseudo-second-order model and the Sips model were most consistent for the adsorption process, indicating that the adsorption process of MIL-68(Fe)/chitosan composite sponge on CR is a complex physicochemical process. The removal rates of CR by MIL-68(Fe) and MIL-68 (Fe)/chitosan composite sponge reached the maximum values of 99.55 % and 99.51 % at 318 K, respectively. And the maximum adsorption capacity of CR by MIL-68(Fe)/chitosan composite sponge at 318 K was 1184.16 mg center dot g(-1). After six cycles of adsorption and desorption, the removal rate of CR was still higher than 80 %. The synergistic effects of pi-pi stacking, electrostatic interactions, hydrogen bonding and pore filling have important effects on CR removal.
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页数：17
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