纤维素基纳米复合材料对亚甲基蓝的吸附及解吸性能

Adsorption and desorption capacities for methylene blue with the cellulose-based nano-composite

采用FTIR和SEM对纤维素-g-聚丙烯酸/丙烯酰胺/蒙脱土(LNC-g-PAA/AM/MMT)纳米复合高吸水性树脂的结构进行表征。研究亚甲基蓝染料的初始质量浓度、吸附时间、吸附温度和pH等不同条件下,对LNC-gPAA/AM/MMT吸附该染料吸附量的影响。此外,在最佳条件吸附饱和时,改变解吸时间、HCl浓度等研究LNC-gPAA/AM/MMT的解吸性能。结果表明:初始质量浓度为2 500 mg/L,120 min,30℃,pH=5时,LNC-g-PAA/AM/MMT的吸附量高达2 038.7 mg/g。整个过程很好地符合伪二级动力学模型和Langmuir等温线。在解吸时间120 min,HCl浓度0.05 mol/L时,解吸率高达73.16%。

The structure of cellulose-g-polyacrylic acid/acrylamide/montmorillonite nano-composite super-absorp tive resin（LNC-g-PAA/AM/MMT） can be characterized by FrIR and SEM. Under different conditions, such as the initial mass concentration,adsorption time, adsorption temperature ,pH,etc. ,the effect of LNC-g-PAA/AM/MMT adsorption capacity on the adsorption quantity of the dye has been studied. In addition, on the basis of the optimum adsorptive saturation conditions, the desorption capacity of LNC-g-PAA/AM/MMT has been studied by changing the desorption time and HC1 concentration. The results show that when the initial mass concentration is 2 500 rag/L, ad sorption time 120 min, adsorption temperature 30 ℃, and pH=5, the adsorption quantity of LNC-g-PAA/AM/MMT is as high as 2 038.7 mg/g. The whole process complies well with pseudo-second-order model and the Langmuir isotherm. When the desorption time is 120 rain and HC1 concentration 0.05 mol/L,the highest desorption rate is as high as 73.16%.