期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 588, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2019.124393
关键词
pH-responsive; Magnetic hydrogel; Graphene oxide; Easily recyclable adsorbent; Dyes; Adsorption
资金
- National Natural Science Foundation of China [21376271]
- Hunan Provincial Science and Technology Plan Project, China [2016TP1007]
- Fundamental Research Funds for the Central Universities of Central South University [2019zzts447]
- Open sharing Fund for the Large-scale Instruments and Equipments of Central South University [CSUZC201928]
- Undergraduates Innovative Training Foundation of Central South University [S201910533529]
pH-responsive magnetic graphene oxide/poly(N-vinylimidazole-co-acrylic acid) hydrogel (MGO/PNA) was synthesized by random copolymerization of N-vinylimidazole (NVI) and acrylic acid (AA) in the presence of ethylenediamine-modified magnetic graphene oxide (MGO). The resulting hydrogel was systematically characterized by mean of Fourier transform infrared spectrometer, X-ray photoelectron spectroscopy, Raman spectrum, Thermogravimetric analysis, and Scanning electron microscope. The swelling percentage of the hydrogel attained the extremely high value at pH = 2 and pH = 12. The resulting MGO/PNA was used as an easily recyclable adsorbent to remove cationic and anionic dyes, and the effects of solution pH, adsorption time, adsorption temperature, and initial concentration on the adsorption process were systematically investigated. The maximum theoretical adsorption capacities of methyl violet (MV), methylene blue (MB), tartrazine (TZ), and amaranth (AR) were 609.8, 625.0, 613.5 and 609.8 mg/g, respectively. The adsorption behaviors of the hydrogel conformed to Langmuir isothermal model and pseudo-second-order model. The mechanism analysis indicated that the addition of Fe3O4 into the hydrogel not only endowed MGO/PNA with easily recyclable characteristic, but also improved the adsorption capacity of the hydrogel to some degree. MGO/PNA hydrogel could maintain good adsorption effect after five adsorption-desorption cycles, so the hydrogel might have the wide application prospect in adsorption science and technology area.
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