期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 651, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129736
关键词
Modified alginate; Graphene oxide; Biocomposite hydrogel microspheres; Adsorption
资金
- National Key Research and Development Program [2021YFD1500800]
- Strategic Priority Sci-ence and Technology Project of Chinese Academy of Sciences [XDA28070000]
- Scientific Research Program of the Education Department of Jilin Province [JJKH20220323KJ]
- People?s Republic of China
- National Training Programs of Innovation and Entrepre-neurship for Undergraduates
Thiol and amido modified alginate combined with graphene oxide were used to fabricate a bio-composite hydrogel microsphere adsorbent for the removal of heavy metal ions from water. The hydrogel microspheres showed rapid adsorption process and excellent capacity for both Pb2+ and Cu2+ ions. The adsorption isothermal and kinetics were well described by Langmuir and pseudo-second-order models. Moreover, the microspheres exhibited good reusability.
Thiol and amido modified alginate was prepared and combined with graphene oxide to fabricate the bio-composite hydrogel microsphere adsorbent for the removal of heavy metal ions from water. Fourier transform infrared (FTIR), scanning electron microscope (SEM) and thermogravimetric analyzer (TGA) were used to characterize the structure and thermal stability of hydrogel microspheres. The adsorption performance and mechanism of the biocomposite hydrogel microspheres for the removal of Pb2+ and Cu2+ from water have also been investigated. The results indicated that the hydrogel microspheres exhibited rapid adsorption process and excellent adsorption capacity for both heavy metal ions. The experimental maximum adsorption capacities for Pb2+ and Cu2+ were 369.6 and 124.1 mg.g(- 1), respectively. The adsorption isothermal and kinetics were well described by Langmuir and pseudo-second-order models. After five consecutive adsorption-desorption cycles, the adsorption capacity of microspheres on Pb2+ and Cu2+ remained above about 90%, indicating their excellent reusability. The rapid and high adsorption efficiency and outstanding regeneration ability suggest that the modified alginate-based biocomposite hydrogel microspheres have potential applications in the field of water treatment.
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