Sunlight-Activated Phase Transformation in Carbon Dot-Hydrogel Facilitates Water Purification and Optical Switching
Sunlight-Activated Phase Transformation in Carbon Dot-Hydrogel Facilitates Water Purification and Optical Switching
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DOI：
10.1021/acsapm.0c00358
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发表时间：
2020-07-10
影响因子：
5
通讯作者：
Jelinek, Raz
中科院分区：
文献类型：
--
作者：
Singh, Seema;Jelinek, Raz
合成了一种由碳点(C-dots)、羧甲基纤维素(CMC)和聚N-异丙基丙烯酰胺(PNIPAM)组成的多功能水凝胶。微孔C-Dot-CMC-PNIPAM水凝胶通过PNIPAM从亲水到疏水的转变，构成了一个有效的阳光介导的净水平台和一个光学开关。特别是，C-点在体系中扮演着关键的角色--作为光热试剂，诱导水凝胶的相变，增强其机械稳定性，通过有效地吸附盐类和污染物来实现水的净化，并通过它们的比色特性提供光学开关功能。这种由可回收、绿色和廉价的试剂制成的复合水凝胶，可以作为一种实用的太阳能载体用于海水淡化和净化，作为一种防假冒智能墨水，以及“开/关”光学开关。
A multifunctional hydrogel comprising carbon dots (C-dots), carboxymethylcellulose (CMC), and poly-(N-isopropylacrylamide) (PNIPAM) has been synthesized. The microporous C-dot-CMC-PNIPAM hydrogel constitutes an effective sunlight-mediated water purification platform and an optical switch, facilitated through the hydrophilic-to-hydrophobic transformation of PNIPAM. The C-dots, in particular, play crucial roles in the system-functioning as photothermal agents for inducing the phase transition of the hydrogel, enhancing its mechanical stability, enabling water purification through effective adsorption of salts and pollutants, and furnishing the optical switching functionality through their colorimetric properties. The composite hydrogel, prepared from recyclable, green, and inexpensive reagents, may serve as a practical solar-mediated vehicle for water desalination and purification, an anticounterfeit smart ink, and an "on/off' optical switch.