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Giant Microgels with CO2-Induced On–Off, Selective, and Recyclable Adsorption for Anionic Dyes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-10-17 00:00:00 , DOI: 10.1021/acsami.8b13448 Zanru Guo 1 , Qiang Chen 1 , Hongjian Gu 1 , Zhanfeng He 2 , Wenyuan Xu 1 , Jiali Zhang 1 , Yongxin Liu 1 , Leyan Xiong 1 , Longzhen Zheng 1 , Yujun Feng 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-10-17 00:00:00 , DOI: 10.1021/acsami.8b13448 Zanru Guo 1 , Qiang Chen 1 , Hongjian Gu 1 , Zhanfeng He 2 , Wenyuan Xu 1 , Jiali Zhang 1 , Yongxin Liu 1 , Leyan Xiong 1 , Longzhen Zheng 1 , Yujun Feng 3
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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.
中文翻译：
具有CO 2的巨型微凝胶对阴离子染料的开-关，选择性和可回收吸附具有诱导作用。
能够控制污染物吸附和释放而不会造成二次污染的吸附剂在水处理中很有吸引力。在这里，我们提出了生态友好型的CO 2引发剂，以切换由亲水性丙烯酰胺和疏水性甲基丙烯酸2-（二乙基氨基）乙酯组成的巨型微凝胶的电荷状态和塌陷-膨胀转变，并证明了开-关，选择性和可回收吸附CO 2刺激下微凝胶上的阴离子染料的合成 除了通过简单的过滤过程与水轻松分离之外，最大吸附量高达821 mg g –1，吸附等温线和动力学分别服从Langmuir等温线和伪二级动力学模型。也可以使用经CO 2处理的微凝胶从混合物溶液中分离出阴离子染料。此外，制备了带有微凝胶填充柱的废水处理原型。在连续流动条件下，通过交替鼓泡CO 2并用碱水溶液（pH 12）冲洗除去染料并进行回收。因此，这种具有CO 2诱导的质子化-去质子化转变的微凝胶可以用作水净化应用中的经济高效，环保和高效的吸附剂。
更新日期：2018-10-17
中文翻译：
具有CO 2的巨型微凝胶对阴离子染料的开-关，选择性和可回收吸附具有诱导作用。
能够控制污染物吸附和释放而不会造成二次污染的吸附剂在水处理中很有吸引力。在这里，我们提出了生态友好型的CO 2引发剂，以切换由亲水性丙烯酰胺和疏水性甲基丙烯酸2-（二乙基氨基）乙酯组成的巨型微凝胶的电荷状态和塌陷-膨胀转变，并证明了开-关，选择性和可回收吸附CO 2刺激下微凝胶上的阴离子染料的合成 除了通过简单的过滤过程与水轻松分离之外，最大吸附量高达821 mg g –1，吸附等温线和动力学分别服从Langmuir等温线和伪二级动力学模型。也可以使用经CO 2处理的微凝胶从混合物溶液中分离出阴离子染料。此外，制备了带有微凝胶填充柱的废水处理原型。在连续流动条件下，通过交替鼓泡CO 2并用碱水溶液（pH 12）冲洗除去染料并进行回收。因此，这种具有CO 2诱导的质子化-去质子化转变的微凝胶可以用作水净化应用中的经济高效，环保和高效的吸附剂。
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