黄芪和凹凸棒石协同稳定水基泡沫模板构筑多孔吸附剂对阳离子染料的高效去除
Fabrication porous adsorbents templated from aqueous foams using astragalus membranaceus and attapulgite as stabilizer for efficient removal of cationic dyes
Fangzhi Duan, Yongfeng Zhu∗, Yushen Lu, Jiang Xu, Aiqin Wang∗
https://doi.org/10.1016/j.jes.2022.08.004
摘要
以高稳定性水基泡沫为模板构筑多孔材料，因其便捷、成本低等优点受到广泛关注。其中，如何实现多孔材料的绿色化模板构筑已成为该领域的研究热点之一。本工作以天然植物黄芪和一维纳米黏土矿物凹凸棒石间的协同作用稳定得到水基泡沫，并通过自由基聚合制得具有丰富孔结构的新型多孔吸附材料。研究结果表明，黄芪中的活性两亲性分子吸附在水-空气两相界面上形成阻隔层，有效阻止了气泡的破裂；凹凸棒石聚集在Plateau边界形成三维网络结构，抑制了泡沫的排液速度。通过该泡沫模板所制备的多孔吸附剂对阳离子染料甲基紫（MV）和亚甲基蓝（MB）表现出优异的去除效果，最大吸附容量分别为709和703 mg/g。更重要的是，吸附后的废弃吸附剂可经过煅烧处理实现循环再生，经过5次循环吸附，再生吸附剂对染料分子的吸附容量仍超过200 mg/g。该研究为多孔材料的绿色制备及可持续利用提供了新思路。
亮点
本工作秉承“源于自然-用于自然”的可持续发展理念，发展了绿色清洁吸附材料制备及再生利用新方法。
Abstract
The water-based foam stabilized by the natural surfactant applied in the fabrication of porous materials has attracted extensive attention, as the advantages of cleanness, convenience and low cost. Particularly, the development of a green preparation method has became the main research focus and frontier. In this work, a green liquid foam with high stability was prepared by synergistic stabilization of natural plant astragalus membranaceus (AMS) and attapulgite (APT), and then a novel porous material with sufficient hierarchical pore structure was templated from the foam via a simple free radical polymerization of acrylamide (AM). The characterization results revealed that the amphiphilic molecules from AMS adsorbed onto the water-air interface and formed a protective shell to prevent the bubble breakup, and APT gathered in the Plateau border and formed a three-dimensional network structure, which greatly slowed down the drainage rate. The porous material polyacrylamide/astragalus membranaceus/attapulgite (PAM/AMS/APT) showed the excellent adsorption performance for cationic dyes of Methyl Violet (MV) and Methylene Blue (MB) in water, and the maximum adsorption capacity could reach to 709 and 703 mg/g, respectively. Furthermore, the polymer material enabled to regenerate and cycle via a convenient calcination process, and the adsorption capacity was still higher than 200 mg/g after five cycles. In short, this research provided a new idea for the green preparation of porous materials and the treatment of water pollution.
作者简介
第一作者：
段房智，中国科学院大学博士研究生，主要从事绿色水基泡沫模板构筑多孔材料及在水处理中的应用研究工作，主持甘肃省自然科学基金优秀博士基金项目1项。在Chem. Eng. J.、J. Cleaner Prod.、Appl. Clay Sci.等国际期刊发表文章8篇。
通讯作者：
（1）王爱勤，研究员，博士生导师，国务院政府特殊津贴、全国创新争先奖和何梁何利基金科学与技术创新奖获得者。主要从事黏土矿物高值利用、有机-无机纳米复合材料和功能吸附材料等方面的研究工作。发表研究论文600余篇，出版专著6部；获授权国家发明专利130余件；自2014年连续9年入选爱思唯尔中国高被引学者榜单。2020年后连续入选全球高被引科学家榜单。获2010年度国家科技进步二等奖和2018年度国家技术发明二等奖。
（2）朱永峰，副研究员，硕士生导师。主要从事黏土矿物功能复合材料及多孔吸附材料的制备及应用研究工作。先后主持完成国家自然科学基金、甘肃省自然基金、中国科学院“西部之光”人才培养计划等项目。在 Chem. Eng. J.、Carbohydr. Polym., Inter. J. Bio. Macromol. 等刊物上发表学术论文40余篇，参与出版中文专著1部，申请及授权相关专利10余件。
原文链接
https://www.sciencedirect.com/science/article/pii/S1001074222004041
引用格式
Fangzhi Duan, Yongfeng Zhu, Yushen Lu, Jiang Xu, Aiqin Wang, 2023. Fabrication porous adsorbents templated from aqueous foams using astragalus membranaceus and attapulgite as stabilizer for efficient removal of cationic dyes. J. Environ. Sci. 127, 855-865.
