Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266000, China.
Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266000, China.
Sci Total Environ. 2021 Apr 1;763:142958. doi: 10.1016/j.scitotenv.2020.142958. Epub 2020 Oct 14.
Three-dimensional graphene aerogel materials used for treatment of oily wastewater with sophisticated composition remains a challenge due to volume shrinkage, resulting in single-function and low adsorption capacity. In this work, renewable Enteromorpha was introduced into the graphene aerogel via facile hydrothermal-freeze casting treatment, forming the compression, ultralight and amphiphilic adsorbent for oil spill cleanup and water pollution remediation. Meanwhile, further freeze casting avoids aerogel collapse for capillary tension during drying and produce more hierarchical pores. As for oil spill clean up, the Enteromorpha modified graphene aerogel (EGA) exhibits excellent adsorption capacity towards oil and organic solvents than pristine graphene aerogel (GA). Even after several cycles by compression and heat treatment, it still has a stable adsorption capacity for oil and organic solvents. The EGA also showed high ability to absorb water-soluble pollutants, such as dyes through hydrogen bonding and electrostatic reactions between dye molecules and aerogel. The facile strategy to fabricate the Enteromorpha-based amphiphilic EGA broadens the applications in water treatment through the high-value utilization of Enteromorpha.
由于体积收缩，用于处理成分复杂的含油废水的三维石墨烯气凝胶材料仍然是一个挑战，这导致其功能单一，吸附容量低。在这项工作中，通过简便的无热冻铸处理将可再生的浒苔引入石墨烯气凝胶中，形成用于溢油清理和水污染修复的抗压、超轻和两亲性吸附剂。同时，进一步的冻铸避免了气凝胶在干燥过程中因毛细张力而坍塌，并产生更多的分级孔。就溢油清理而言，浒苔改性石墨烯气凝胶（EGA）比原始石墨烯气凝胶（GA）对油和有机溶剂表现出优异的吸附能力。即使经过几次压缩和热处理循环，它对油和有机溶剂仍然具有稳定的吸附能力。EGA 还通过染料分子和气凝胶之间的氢键和静电反应显示出对水溶性污染物（如染料）的高吸收能力。通过利用浒苔的高附加值来制备基于浒苔的两亲性 EGA 的简便策略拓宽了其在水处理中的应用。
