Giant Microgels with CO2-Induced On-Off, Selective, and Recyclable Adsorption for Anionic Dyes
Giant Microgels with CO2-Induced On-Off, Selective, and Recyclable Adsorption for Anionic Dyes
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具有 CO2 诱导开关、选择性和可回收吸附功能的巨型微凝胶，用于阴离子染料
DOI：
10.1021/acsami.8b13448
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发表时间：
2018-11-07
影响因子：
9.5
通讯作者：
Feng, Yujun
中科院分区：
文献类型：
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作者：
Guo, Zanru;Chen, Qiang;Feng, Yujun
能够控制污染物的吸附和释放而不产生二次污染的吸附剂在水处理中具有很大的吸引力。在这里，我们提出了生态友好型的CO2作为触发器来切换由亲水性丙烯酰胺和疏水性2-（二乙胺）甲基丙烯酸乙酯组成的巨微凝胶的电荷状态和崩溃-膨胀转变，并证明了在CO2刺激下微凝胶对阴离子染料的开关、选择性和可回收吸附。吸附量可达821 mg g(-1)，吸附等温线服从Langmuir等温线，吸附动力学服从拟二级动力学模型。阴离子染料也可以用二氧化碳处理过的微凝胶从混合溶液中分离出来。此外，还制作了微凝胶填充柱处理废水的原型。在连续流动条件下，采用交替鼓泡CO2和pH为12的碱水冲洗法对染料进行脱除和回收。因此，这种具有co2诱导的质子化-去质子化过渡的微凝胶可以作为一种经济、环保和高效的吸附剂用于水净化应用。
Adsorbents that are capable of controllable pollutants adsorption and release without secondary pollution are attractive in water treatment. Here, we propose eco-friendly CO2 as a trigger to switch the charge states and collapse-expansion transition of giant microgels consisting of hydrophilic acrylamide and hydrophobic 2-(diethylamino)ethyl methacrylate and demonstrated the on-off, selective, and recyclable adsorption of anionic dyes on microgels under CO2 stimulation. Apart from easy-handling separation from the water by a simple filtration process, the maximum adsorption capacity is as high as 821 mg g(-1), and the adsorption isotherms and kinetics obeyed Langmuir isotherm and the pseudo-second order kinetics models, respectively. The anionic dye can also be separated from the mixture solution using CO2-treated microgels. Moreover, a wastewater treatment prototype with microgel-packed column was fabricated. Under continuous flow condition, the dye was removed and recovered by alternative bubbling CO2 and flushing with aqueous alkali (pH 12). Thus, this type of microgels with CO2-induced protonation-deprotonation transition can serve as a cost-effective, environmentally friendly, and efficient adsorbent for water purification applications.