分光光度法测定十二烷基硫酸钠在石英砂上的静态吸附

Measuring static adsorption of sodium dodecyl sulfate on quartz sand by ultraviolet spectrophotometer

利用甲基橙(MO)-溴化十六烷基吡啶(CPB)分光光度法测定十二烷基硫酸钠(SDS)在石英砂表面吸附后的浓度,得出静态吸附量。结果表明,用此法检测SDS的浓度是可行的,确定464 nm为测定波长,线性回归方程y=0.148 47x-0.008 56,R2=0.998 32。通过测定不同时间的吸附量,得出SDS在石英砂表面的吸附平衡时间为48 h。分别用模拟地层水和蒸馏水配制SDS溶液,确定了平衡吸附量分别为5.0 mg/g和1.8 mg/g,结果表明高矿化度导致了SDS在石英砂表面的大量吸附,并分析了模拟地层水条件下SDS在石英砂上的静态吸附不符合Langmuir模式的原因是SDS的脱附和沉淀再溶解。

Methyl orange( MO)-cetylpyridinium bromide( CPB) spectrophotometry was used in the determination of the concentration of SDS solution after adsorbing. The static adsorption capacity was obtained. The results showed that this method using spectrophotometry with 464 nm wavelength is feasible in measuring the concentration of SDS,a regression equation was obtained as y = 0. 148 47x-0. 008 56,R2= 0. 998 32. By measuring equilibrium adsorption capacity of SDS on quartz sand at different time,the adsorption equilibrium time of 48 h was obtained. SDS solution was prepared with simulated formation water and distilled water,of which the equilibrium adsorption capacity was 5. 0 mg / g and 1. 8 mg / g respectively. The results showed that it was high salinity which leading considerable adsorption of SDS on quartz sand. Analyzing the causes of adsorption of SDS on quartz sand under condition of simulated formation water which does not meet the Langmuir pattern were desorption of SDS and precipitation re-dissolved.