期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 554, 期 -, 页码 48-58出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.06.099
关键词
Adsorption; Core-shell microsphere; Cellulose nanocrystal (CNC); Diclofenac sodium (DS); Polyethyleneimine (PEI); Pharmaceuticals and personal care products (PPCPs); Polyvinyl alcohol (PVA); Sodium alginate (SA)
资金
- National Natural Science Foundation of China, China [21476212]
- Key research and development plan of Zhejiang Province, China [2018CO2038]
- Foundation of Bureau of Science and Technology of Zhoushan, China [2019C21023]
Hypothesis: We synthesized composite microspheres from cellulose nanocrystal (CNC), polyvinyl alcohol (PVA), and sodium alginate (SA), which were modified with polyethyleneimine (PEI) to introduce a high density of active amino sites onto the surface via the Schiff base reaction. We hypothesized that these (SA/CNC/PVA)@PEI microspheres would have a high adsorption capacity for aqueous diclofenac sodium (DS). Experiments: The PEI-modified composite microspheres were characterized and assessed and optimized for aqueous DS adsorption. In addition, the morphology and synthesis mechanism of the adsorbent were studied. Findings: The adsorption process showed a good fit with the pseudo-second-order kinetic model (i.e., the process is driven by a chemical adsorption mechanism) and Langmuir adsorption isotherm model (i.e., adsorption follows a single-layer process). Under the optimum experimental conditions (pH: 4.5, adsorption time: 50 min, temperature: 303 K), the maximum adsorption capacity was 418.4104 mg/g, which was relatively high compared to other reported adsorbents. Importantly, after five adsorption-desorption cycles, (SA/CNC/PVA)@PEI showed only a slight loss in adsorption capacity. Compared with other reported adsorbents, the core-shell composite has a good DS adsorptive capacity and high recyclability. (C) 2019 Elsevier Inc. All rights reserved.
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