摘要
采用紫外吸收光谱法研究金属阳离子(Ca2+、Mg2+、K+)对两种阴离子表面活性剂——十二烷基苯磺酸钠(SDBS)和α-烯基磺酸钠(AOS)紫外吸收特性的影响。结果表明,SDBS在224 nm和261 nm附近均有特征吸收峰,而AOS只在238 nm附近有一个特征吸收峰,这是由于SDBS中含有芳香烃结构。SDBS和AOS的紫外吸光强度均与表面活性剂浓度呈线性正相关。当在SDBS溶液中加入三种金属盐,发现金属盐的加入会使224 nm处的吸收峰产生减色效应,使261 nm处的吸收峰产生增色效应,同时二价盐的加入都会使SDBS溶液吸光度有明显变化,Ca2+盐比Mg2+盐对SDBS吸光度的影响更大,而K+盐的加入对SDBS吸光度的影响较小。当在AOS溶液中加入金属盐,Ca2+盐易使AOS溶液产生沉淀,Mg2+盐促进AOS溶液吸光度升高,产生增色效应,K+盐基本无影响。在相同的金属盐浓度时,金属盐对阴离子表面活性剂吸光度影响顺序为Ca2+>Mg2+>K+,这归因于金属阳离子电荷半径的差异。
Using ultraviolet(UV)absorption spectroscopy to investigate the influences of metal cations(Ca,Mg,K)on the UV absorption characteristics of two anionic surfactant solutions——sodium dodecylbenzene sulfonate(SDBS)and sodiumα-alkenyl sulfonate(AOS).The results show that SDBS has two absorption peaks near 224 nm and 261 nm,whereas there is only one absorption peak near 238 nm for AOS.This difference can be attributed to the unique aromatic hydrocarbon structure in SDBS.Both the UV absorption intensity of SDBS and AOS are linearly positively correlated with the surfactant concentration,thus UV absorption spectroscopy can be used to quantitatively characterize the concentration of SDBS and AOS in the aqueous solution.When three metal salts are added to the SDBS solution,it is found that the addition of the metal salt will cause the absorption peak at 224 nm to produce a hypochromic effect,and the absorption peak at 261 nm will produce a hyperchromic effect.At the same time,the addition of divalent salt will change the absorbance of SDBS solution significantly,Casalt has a larger effect on SDBS absorbance than Mgsalt,while K salt has a negligible effect on SDBS absorbance.In the presence of Ca,AOS can be easily precipitated.The addition of Mg salt promotes the increase in the absorbance of the AOS solution and produce a hyperchromic effect,the K salt still has a slight effect.At the same metal salt concentration,the order of the influence of metal salt on the UV absorbance of anionic surfactants is Ca>Mg>K,which is attributed to the difference in the charge radius of the metal cation.
作者
刘子龙
侯晓楠
郭丰志
吴冲
李雪
矫玉秋
卢贵武
LIU Zi-long;HOU Xiao-nan;GUO Feng-zhi;WU Chong;LI Xue;JIAO Yu-qiu;LU Gui-wu(Beijing Key Laboratory of Optical Detection Technology for Oil and Gas,College of Science,China University of Petroleum (Beijing),Beijing 102249,China)
出处
《应用化工》
CAS
CSCD
北大核心
2022年第5期1330-1334,共5页
Applied Chemical Industry
基金
山西省科技重大专项(20201102002)
油气资源与探测国家重点实验室课题(PRP/DX-2216)
中国石油大学(北京)青年拔尖人才基金(2462020BJRC007)
中国石油大学(北京)前瞻导向项目(2462020YXZZ003)。
关键词
阴离子表面活性剂
金属盐
特征吸收峰
紫外吸收光谱
anionic surfactant
metal salt
characteristic absorption peak
UV absorption spectrum
