Lai Bingmei, Hu Haoyun, Tang Ningli, Huang Yipeng, Ruan Guihua
Guangxi Colleges and Universities Key Laboratory of Food Safety and Detection, College of Chemistry and Bioengineering, Guilin University of Technology, Guangxi, China.
School of Mechanical and Electrical Engineering, Guilin Institute of Information Technology, Guilin, China.
J Sep Sci. 2024 Jun;47(11):e2400013. doi: 10.1002/jssc.202400013.
In this study, monodisperse, uniform, and spherical covalent organic frameworks (COFs) were synthesized using 1,3,5-tris (4-aminophenyl) benzene and 1,3,5-tricarboxaldehyde benzene at room temperature. Post-modification of 6-aminocaproic acid on the COFs yielded carboxyl-modified COFs (COFs-COOH). The modification enhanced the hydrophilicity and adsorption efficiencies of COFs-COOH for malachite green (MG) and crystal violet (CV). A COFs-COOH-based dispersive solid-phase extraction coupled with high-performance liquid chromatography was developed for the analysis of MG and CV. The method showed a linear range from 10 to 1000 ng/mL with detection limits of 1.82 and 0.70 ng/mL for MG and CV detection, respectively. The recoveries of MG and CV from water samples collected from fish farms and markets ranged from 91.63% to 107.10% with relative standard deviations below 5%. Reproducibility tests demonstrated that the adsorption efficiencies of COFs-COOH were maintained at above 85.86% over 15 cycles. The study verified the potential of COFs-COOH as sorbents for the enrichment and separation of triphenylmethane dyes from complex samples.
在本研究中，使用1,3,5-三（4-氨基苯基）苯和1,3,5-三甲醛苯在室温下合成了单分散、均匀且呈球形的共价有机框架（COF）。在COF上进行6-氨基己酸的后修饰，得到羧基修饰的COF（COF-COOH）。该修饰提高了COF-COOH对孔雀石绿（MG）和结晶紫（CV）的亲水性和吸附效率。开发了一种基于COF-COOH的分散固相萃取结合高效液相色谱法用于分析MG和CV。该方法的线性范围为10至1000 ng/mL，MG和CV检测的检出限分别为1.82和0.70 ng/mL。从养鱼场和市场采集的水样中MG和CV的回收率为91.63%至107.10%，相对标准偏差低于5%。重现性测试表明，COF-COOH的吸附效率在15个循环中保持在85.86%以上。该研究证实了COF-COOH作为从复杂样品中富集和分离三苯甲烷染料的吸附剂的潜力。
