摘要
染料废水是难处理工业废水之一。文章应用壳聚糖改性膨润土,以罗丹明水溶液吸附对象,考察了pH值、罗丹明浓度、吸附时间等条件,对罗丹明吸附的影响,研究了壳聚糖改性膨润土对罗丹明吸附模型、热力学与动力学。得出:改性膨润土的吸附能力明显优于未改性的膨润土。在最适pH 6,随吸附温度的升高,吸附量增大;通过计算不同温度下各热力学参数ΔG0、ΔH0和ΔS0,证实该吸附为一自发的放热过程;对实验数据运用相关数学模型拟合,得出等温吸附平衡更符合Langmuir模型,吸附过程动力学更适合二级反应。
Dyestuff wastewater was a kind of the industrial wastewater, which was the mainly harmful one in our country. Chitosan modified bentonite was used as an adsorbent to treat RhB from aqueous solution at various contact time, initial pH and temperature. Modified by chitosan＇ it made bentonite more effectively to adsorb RhB than the original soil. The results showed that adsorption optimum was pH 6 and absorption capacity increased with the increase of temperature. The adsorption process was spontaneous, endothermic by calculating thermodynamic parameters △G^0、△H^0 and △S^0 in different temperatures. The experimental data indicated that the adsorption followed Langmuir isotherm model better, and this adsorption kinetics met the pseudo-second-order reaction model.
出处
《广州化工》
CAS
2009年第3期122-124,共3页
GuangZhou Chemical Industry
