Cockerham Carrie, Caruthers Ashton, McCloud Jeremy, Fortner Laura M, Youn Sungmin, McBride Sean P
Department of Civil Engineering, Marshall University, Huntington, WV 25755, USA.
John T. Hoggard High School, 4305 Shipyard Boulevard, Wilmington, NC 28403, USA.
Micromachines (Basel). 2022 Apr 7;13(4):577. doi: 10.3390/mi13040577.
Challenges exist in the wastewater treatment of dyes produced by the world's growing textiles industry. Common problems facing traditional wastewater treatments include low retention values and breaking the chemical bonds of some dye molecules, which in some cases can release byproducts that can be more harmful than the original dye. This research illustrates that track-etched polycarbonate filtration membranes with 100-nanometer diameter holes can be functionalized with azo dye direct red 80 at 1000 µM, creating a filter that can then be used to remove the entire negatively charged azo dye molecule for a 50 µM solution of the same dye, with a rejection value of 96.4 ± 1.4%, at a stable flow rate of 114 ± 5 µL/min post-functionalization. Post-functionalization, Na and NO3 ions had on average 17.9%, 26.0%, and 31.1% rejection for 750, 500, and 250 µM sodium nitrate solutions, respectively, at an average flow rate of 177 ± 5 µL/min. Post-functionalization, similar 50 µM azo dyes had increases in rejection from 26.3% to 53.2%. Rejection measurements were made using ultraviolet visible-light spectroscopy for dyes, and concentration meters using ion selective electrodes for Na and NO3 ions.
全球纺织业不断发展，由此产生的染料废水处理面临诸多挑战。传统废水处理方法面临的常见问题包括截留率低以及破坏某些染料分子的化学键，在某些情况下，这会释放出比原始染料危害更大的副产物。本研究表明，孔径为100纳米的径迹蚀刻聚碳酸酯过滤膜可用1000微摩尔的偶氮染料直接红80进行功能化处理，制成一种过滤器，该过滤器可用于去除50微摩尔该染料溶液中的全部带负电荷的偶氮染料分子，功能化处理后在114±5微升/分钟的稳定流速下截留率为96.4±1.4%。功能化处理后，对于750、500和250微摩尔的硝酸钠溶液，Na和NO3离子的截留率平均分别为17.9%、26.0%和31.1%，平均流速为177±5微升/分钟。功能化处理后，类似的50微摩尔偶氮染料的截留率从26.3%提高到了53.2%。使用紫外可见光谱法测量染料的截留率，使用离子选择性电极的浓度计测量Na和NO3离子的截留率。
