Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada.
Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada.
Environ Res. 2022 Apr 1;205:112531. doi: 10.1016/j.envres.2021.112531. Epub 2021 Dec 11.
Oil spills may affect ecosystems and endanger public health. In this study, we developed a novel and dual responsive nanoclay/sodium alginate (NS) washing fluid, and systematically evaluated its application potential in oiled shoreline cleanup. The characterization results demonstrated that sodium alginate combined with nanoclay via hydrogen bonds, and was inserted into the interlayer spacing of nanoclay. Adding sodium alginate reduced surface and interfacial tensions, while increasing the viscoelasticity of the washing fluid. Batch experiments were conducted to investigate oil removal performance under various conditions. Additionally, the factorial design analysis showed that three single factors (temperature, oil concentration, and salinity), and two interactive effects (temperature/salinity; and oil concentration/HA) displayed significant effects on the oil removal efficiency of the NS washing fluid. Compared to the commercial surfactants, the NS composite exhibited satisfactory removal efficiencies for treating oily sand. Green materials-stabilized Pickering emulsion can potentially be used for oil/water separation. The NS washing agent displayed excellent pH- and Ca- responsiveness, generating transparent supernatants with low oil concentration and turbidity. Our work opens an interesting avenue for designing economical, high performance, and green washing agents.
溢油可能会影响生态系统并危及公众健康。在本研究中，我们开发了一种新型的双重响应纳米黏土/海藻酸钠（NS）洗涤液，并系统地评估了其在含油海岸线清理中的应用潜力。表征结果表明，海藻酸钠通过氢键与纳米黏土结合，并插入纳米黏土的层间距中。添加海藻酸钠降低了表面和界面张力，同时增加了洗涤液的粘弹性。进行了批量实验以研究各种条件下的除油性能。此外，析因设计分析表明，三个单因素（温度、油浓度和盐度）以及两个交互作用（温度/盐度；和油浓度/HA）对 NS 洗涤液的除油效率有显著影响。与商业表面活性剂相比，NS 复合材料对处理含油砂具有令人满意的去除效率。稳定的 Pickering 乳液的绿色材料可用于油水分离。NS 洗涤剂表现出优异的 pH 值和 Ca 响应性，生成了油浓度和浊度低的透明上清液。我们的工作为设计经济、高性能和绿色的洗涤剂开辟了一条有趣的途径。
