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A forward osmosis hydrogel draw agent that responds to both heat and CO2
Desalination ( IF 8.3 ) Pub Date : 2021-04-14 , DOI: 10.1016/j.desal.2021.115074
Sarah N. Ellis , Michael F. Cunningham , Philip G. Jessop

Dual CO2- and thermo-responsive superabsorbent poly(N,N-dimethylallylamine) hydrogel (g-PDMAAm) was synthesized for the first time, via a one pot synthesis. When just using the CO2-response, g-PDMAAm is highly hydrophilic and can absorb large volumes of water but cannot expel all this water upon deprotonation. When using the thermo-response, g-PDMAAm is less hydrophilic and can absorb smaller amounts of water but can release nearly all the water when heated. When the CO2- and thermo-responsive properties are used in unison, g-PDMAAm can reversibly absorb 200 times its weight in carbonated water and expel up to 99.9% of the absorbed water upon application of modest heat (60 °C) in both air and water. Raising the temperature decreases both the extent of protonation and the osmotic pressure of the gel, which leads to improved water release. In a forward osmosis apparatus, the PDMAAm gel can extract water from 3.5 wt% NaCl feeds.



中文翻译:

对热量和CO 2都响应的正渗透水凝胶吸引剂

通过单罐合成法首次合成了双重CO 2-和热响应性超吸收性聚(NN-二甲基烯丙基胺)水凝胶(g-PDMAAm)。当仅使用CO 2响应时,g-PDMAAm具有高度亲水性,可以吸收大量的水,但是在去质子化时不能将所有这些水排出。使用热响应时,g-PDMAAm的亲水性较低,可以吸收较少量的水,但加热后几乎可以释放所有水。当CO 2-同时具有热响应特性,g-PDMAAm可在碳酸水中可逆地吸收其重量的200倍,并在空气和水中适度加热(60°C)时可吸收高达99.9%的吸收水。升高温度既降低了质子化的程度,又降低了凝胶的渗透压,从而改善了水的释放。在正向渗透装置中,PDMAAm凝胶可以从3.5 wt%的NaCl进料中提取水。

更新日期:2021-04-14
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