凹凸棒土漂浮型滤料对水中腐殖酸的吸附性能研究

Study on adsorption characteristics of humic acid by attapulgite-based floating filter material from aqueous solution

研究了凹凸棒土漂浮型滤料(AFFM)对水中腐殖酸的吸附性能。实验结果表明,在酸性条件下,AFFM对腐殖酸有着较好的吸附效果;在25℃时,AFFM的吸附特点更符合Freundlich方程。吸附动力学的实验结果表明,吸附过程更符合拟二级动力学方程,当初始浓度为2~18 mg/L时,实测得AFFM对腐殖酸的最大吸附量为8.33 mg/L,由Langmuir吸附等温式拟合计算的理论吸附量为9.61 mg/L;温度对吸附效果的影响不显著。

The adsorption characteristics of humic acid on attapulgite-based floating filter material（ AFFM） were studied.There sults show that the adsorption process is more effective at acidic condition; the adsorption process matches the equation of Freundlich comparatively at 25 ℃.The experimental results of adsorption kinetics show that the adsorption process is more consistent with the second order kinetics equation; when consistency of humic acid varies from 2 mg/L to18 mg/L, the experimental maximum absorption amount of is 8.33 mg/L and the theoretical maximum adsorption amount fitting with Langmuir adsorption isotherm is 9.61 mg/L; the effect of temperature on adsorption is not significant.