化学工程

研究并建立一种测定OP-20(辛基酚聚氧乙烯醚)和DSS(十二烷基磺酸钠)在二元表面活性剂复合体系(OP-20/DSS)中浓度的方法。DSS会影响OP-20的吸光度和紫外光谱法检测的复合系统临界胶束浓度c_cmc的准确性。0.180 mmol/L的OP-20在加入0.300 mmol/L DSS后，其最大吸收波长223 nm处的吸光度由1.582提升至1.642。c_cmc由原来的0.193 mmol/L降为0.182 mmol/L。实验结果表明：c_cmc在OP-20溶液中加入β-CD(β-环糊精)后消失。0.180 mmol/L的OP-20在0.300 mmol/L的DSS溶液中吸光度由1.634微升至1.638,仅增加0.20%。由此可见，加入β-CD可以破坏复合系统中OP-20的胶束聚集，从而减少DSS对测定复合系统中OP-20浓度检测的干扰。提高了复合系统中紫外光谱法对OP-20浓度检测的准确性。此外，OP-20对DSS的电导检测没有明显影响，可以利用电导法准确检测复合体系中DSS的浓度。Job′s法(等摩尔连续递变法)、FT-IR(傅里叶变换红外光谱法)以及~1H-NMR(核磁共振氢谱法)的实验结果显示，OP-20进入β-CD分子空腔形成n(β-CD)∶n(OP-20)=1∶1的包结物，β-CD的包结作用防止了OP-20形成胶束。

A novel method was developed for detecting the binary surfactant compound system of OP-20(octylphenol polyoxyethylene ether) and DSS(sodium dodecyl sulfonate).The absorbance and critical micelle concentration c_cmc of OP-20 in the compound system were influenced by DSS,making it impossible to accurately determine the OP-20 concentration using UV spectroscopy.Upon adding 0.300 mmol/L of DSS,the absorbance of 0.180 mmol/L OP-20 at the maximum absorption wavelength of 223 nm rose from 1.582 to 1.642,while the c_cmc of OP-20 decreased from 0.193 mmol/L to 0.182 mmol/L. The results show that the addition of β-CD can destroy the aggregation of OP-20 into micelles, and reduce the influence of DSS on the determination of OP-20 concentration in the compound system.After adding β-CD to OP-20,c_cmc is no longer detected, and the absorbance of 0.180 mmol/L OP-20 in 0.300 mmol/L DSS solutions increases slightly from 1.634 to 1.638, increasing by only 0.20%.It can be seen that the addition of β-CD is beneficial to improve the detection accuracy of OP-20 concentration in the combination system by UV spectroscopy.The findings indicate that OP-20 does not significantly influence the detection of DSS conductivity, and the conductivity method can effectively measure the concentration of DSS in the compound system.The results of Job′s method, FT-IR and ~1H-NMR show that OP-20 enters into the β-CD cavity to form n(β-CD)∶n(OP-20)=1∶1 inclusion compound.It is the cause that β-CD eliminates the interference of DSS on OP-20 and prevents the formation of OP-20 micelles in the compound system.