Synthesis of dual pH- and temperature-sensitive poly(N-isopropylacrylamide-co-acrylic acid)/sewage sludge ash hydrogel with the simultaneously high performance of swelling and deswelling

被引:7
|
作者
Pan, Zhihui [1 ,2 ]
Huang, Yingru [2 ]
Guo, Haoyong [2 ]
Huang, Tingjian [2 ]
Wen, Gang [3 ]
Yu, Huarong [1 ,2 ]
He, Junguo [1 ,2 ]
机构
[1] Guangzhou Univ, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou, Peoples R China
[2] Guangzhou Univ, Sch Civil Engn, Guangzhou 510006, Peoples R China
[3] Xian Univ Architecture & Technol, Shanxi Key Lab Environm Engn, Xian, Peoples R China
基金
中国国家自然科学基金;
关键词
deswelling; dual pH- and temperature-sensitive; hydrogel; sewage sludge ash; swelling; SUPERABSORBENT HYDROGEL; CELLULOSE NANOFIBRILS; OSMOSIS DESALINATION; RESPONSIVE HYDROGEL; POLYMER HYDROGELS; ADSORPTION; SILICON; COMPOSITE; MECHANISM; ADSORBENT;
D O I
10.1002/pat.5509
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
An advanced dual pH- and temperature-sensitive hydrogel (NASH2.5) was optimally synthesized through modification of N-isopropylacrylamide (NIPAM) hydrogel with introducing 5 mol% acrylic acid (AA) and 2.5 wt% sewage sludge ash (SSA). The swelling kinetic results showed that NASH2.5 exhibited both high equilibrium swelling ratio and swelling rate, which was attributed to the higher porous structure as shown in scanning electron microscope, and the more hydrogen bonding formed inside of the hydrogel as investigated in Fourier transform infrared spectrometer. In addition, its curve was better fitted to the pseudo-second-order model, indicating that the water absorption process was dominated by chemisorption through forming the hydrogen bonding among the water molecules and carboxyl/silanol groups of the hydrogel. Compared with the pure NIPAM hydrogel, the water transport mechanism switched from Case I diffusion to Case II diffusion by introduction of AA and further SSA. Furthermore, through the results of the deswelling kinetics in pH value change (from 9 to 4 and 2, respectively), temperature value change (from 25 to 40, 50, and 60 degrees C, respectively), and dual pH and temperature values changes, NASH2.5 not only presented a high pH sensitivity, but also showed high sensitive to temperature by achieving high water recovery ratio in rapid dehydrated rate. Therefore, the dual stimuli-sensitive hydrogel with the simultaneously high performance of swelling and deswelling would provide a suitable alternative for specific applications such as pollutant adsorption.
引用
收藏
页码:235 / 245
页数:11
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