Highly efficient removal of cadmium (II) ions using cellulose-based monolith with a hierarchically porous structure fabricated through phase separation method

被引：8
作者：
Xin, Yuanrong [1 ]
Ma, Shiliang [1 ]
Chen, Guronghua [1 ]
Huang, Lanlan [1 ]
Xie, Zerong [1 ]
机构：
[1] Jiangsu Univ, Sch Pharm, Zhenjiang 212013, Jiangsu, Peoples R China
来源：
JOURNAL OF WATER PROCESS ENGINEERING | 2022年 / 48卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Cellulose-based monolith; Hierarchically porous structure; Efficient adsorbent; Cadmium (II) ion; Wastewater treatment; HEAVY-METAL IONS; WASTE-WATER; AQUEOUS-SOLUTIONS; ADSORPTION; PRECIPITATION; COMPOSITE; FRAMEWORK; MEMBRANES; GRAPHENE; OXIDES;
D O I：
10.1016/j.jwpe.2022.102901
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, a functionalized cellulose-based monolith was utilized as a highly efficient adsorbent to remove heavy metal ions. Firstly, cellulose-based monolith (CE MONOLITH) was obtained via combination of thermally induced phase separation and post-alkaline hydrolysis. Afterwards, the functionalized monolith (EDTA-CE MONOLITH) was prepared through esterification with ethylenediaminetetraacetic dianhydride. The fabricated EDTA-CE MONOLITH showed a hierarchically porous morphology containing macro- and mesopores simultaneously with an excellent compressive strength, which was extremely suitable for heavy metal removal. The porous structure and chemical properties of CE MONOLITH and EDTA-CE MONOLITH were characterized through SEM, N-2 adsorption/desorption isotherm, FT-IR, elementary analysis, EDS, and XPS. Finally, the batch and fixed-bed column experiments were performed to evaluate the adsorption behaviors of EDTA-CE MONOLITH for Cd2+. The results revealed that EDTA-CE MONOLITH exhibited a relatively fast Cd2+ adsorption rate with a maximum adsorption capacity of 110.1 mg/g. And EDTA-CE MONOLITH could be regenerated easily and displayed excellent reusability without significant loss of absorption capacity. The fixed-bed column adsorption implied that EDTA-CE MONOLITH showed high efficiency for Cd2+ adsorption. Therefore, the EDTA-CE MONOLITH fabricated in this work had large potential to be used as an efficient adsorbent for the removal of heavy metal ions in wastewater treatment.
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页数：11
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