ISSN:
1435-1536
Keywords:
Adsorption
;
desorption
;
stopped-flowmethod
;
sodium alkylsulfates
;
nylon
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The desorption rate of surfactant ions from nylon particles was investigated at the concentrations below the critical micelle concentration by applying the stopped-flow method. A mixing cell of stopped-flow spectrophotometer was modified with platinum electrodes for electric conductivity detection. The change in electric conductivity with time in the desorption process was monitored by a memory-recorder system. The surfactants used were sodium decyl, sodium dodecyl, sodium tetradecyl, and sodium hexadecyl sulfates. The desorption rate was independent of the surfactant concentration and the rate constants were obtained by applying the first-order reaction scheme. The adsorption rate constants were estimated from the experimental desorption rate constants and equilibrium constants assuming the second-order kinetics. The desorption rate constants were determined to be 1–6 sec−1 and the adsorption rate constants to be 2–8×104 mol−1 dm3 sec−1; the former decreased and the latter increased with increasing number of carbon atoms in alkyl chain of the surfactants.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01414402
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