pH和盐对活性炭纤维吸附2,4-二硝基酚的影响

研究了pH和盐对活性炭纤维ST-8和ST-13吸附2,4-二硝基酚的影响。结果表明,在pH0～14范围内,吸附量先随着pH的增大而增大,然后吸附量随着pH的增大而减小,在pH11时吸附量最小但不为零;在pH11～14范围内,吸附量随着pH增大而增大;ST-8和ST-13吸附2,4-二硝基酚的最佳pH分别为2和3。盐的存在对吸附2,4-二硝基酚有利,低pH时,氯化钠的作用是盐析效应;在pH较大时,氯化钠的作用是屏蔽效应。

pH and Salt Effect on the Adsorption of 2,4-Dinitrophenol onto Activated Carbon Fiber

Effects of pH and salt on the adsorption of 2,4-dinitrophenol onto activated carbon fiber (ACF) ST-8 and ST -13 were studied. Results of experiments showed that at pH 0 ～14 the adsorption amount firstly increased with increasing pH,then decreased with increasing pH; at pH 11 it was minimum but not zero; at pH 11～14,it increased with increasing pH. The optimal pH value for ST-8 and ST-13 adsorption of 2,4-dinitrophenol were 2 and 3 respectively. Presence of sodium chloride presented positive effect on the adsorption. At the lower pH values,the effect of NaCl on the adsorption was attributed to salting-out effect while at the higher pH values,the effect of NaCl was screening effect.