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288 results on '"Sui, Kunyan"'

30. Calcium alginate/activated carbon/humic acid tri-system porous fibers for removing tetracycline from aqueous solution

Author

Sun Qinye, Zheng Heng, Li Yanhui, Li Meixiu, Du Qiuju, Wang Cuiping, Sui Kunyan, Li Hongliang, and Xia Yanzhi

Subjects
sodium alginate, humic acid, activated carbon, adsorption, tetracycline, Chemistry, QD1-999
Abstract

In this study, activated carbon and humic acid powder were fixed by the cross-linking reaction of sodium alginate. Calcium alginate/activated carbon/humic acid (CAH) tri-system porous fibers were prepared by the wet spinning method and freeze-dried for the removal of tetracycline in aqueous solution. Subsequently, the morphology and structure of CAH fibers were measured by scanning electron microscopy (SEM) and the Brunauer-Emmett-Teller (BET) method. The effect of pH, contact time, temperature and other factors on adsorption behavior were analyzed. The Langmuir and Freundlich isotherm models were used to fit tetracycline adsorption equilibrium data. The dynamics data were evaluated by the pseudo-second-order model, the pseudo-second-order model and the intraparticle diffusion model. Thermodynamic study confirmed that the adsorption of tetracycline on CAH fibers was a spontaneous process.

Published
2020
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45. Construction of 3D Shape‐Changing Hydrogels via Light‐Modulated Internal Stress Fields.

Author

Xu, Zihan, Fan, Wenxin, Duan, Jinghua, Xia, Yanzhi, Nie, Zhihong, and Sui, Kunyan

Abstract

The 3D shape‐changing hydrogels are highly pursued for numerous applications. However, up to now, the construction of complex 3D shape‐changing hydrogels remains a challenge. The reported design strategies are mainly applied to fabricate 2D ones by introducing anisotropic microstructures into hydrogel sheets/membranes. Herein, we present a convenient photolithography strategy for constructing complex 3D shape‐changing hydrogels by simultaneously modulating anisotropic microstructures and internal stress fields of gel sheets. When the precursor solution containing ultraviolet (UV) absorber is irradiated by single‐side UV light, the attenuated polymerization rate can cause the generation of asymmetric internal stress field in the resulting hydrogel sheet. In the meantime, the directional diffusion of unpolymerized monomers allows for the formation of vertical gradient structure within hydrogel. Therefore, by applying different photomasks to modulate the local gradient structures and internal stress fields of the gel sheets, they can spontaneously transform into various complex 3D shape‐changing hydrogels in the air. Response to the external stimuli, these 3D shape‐changing hydrogels (e.g., fighter plane, birdie, and multi‐storey origami lattices) can deform in a novel 3D1‐to‐3D2‐to‐3D3 mode. This new design strategy contributes to the development of complex biomedical implants and soft robotics. [ABSTRACT FROM AUTHOR]

Published
2023
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