林业科学2012，Vol.48Issue(7)：120-127,8.
木粉/壳聚糖接枝丙烯酸-丙烯酰胺吸附树脂对Pb2+的吸附
Adsorption of Pb2+ on Wood Flour/Chitosan Graft Acrylic Acid-Acrylamide Adsorption Resins
摘要
Abstract
The adsorption properties of self-made wood flour/chitosan graft acrylic acid-acrylamide copolymerization resin ( adsorbing resin R ) are discussed under different adsorption conditions. The optimum using conditions of the adsorbing resin R in the Pb2+ solutions are 30℃, pH =6. 0, resin usage 0. 2 g·L-1, the initial concentration of Pb2+ 0.75 mmol·L-1, the adsorbing time 8 h( static)or 6 h(dynamic). Under the above-mentioned conditions, the adsorption capacity of Pb2+ for the adsorbing resin R is 2. 52 mmol·g-1 and its removing percent of Pb2+ is 97. 1 % . The adsorption capacities of the adsorbing resin R obviously reduced while NaCl, NaNO3 or urea is added in the Pb2+ ion solutions, the decreasing rate is the fastest when NaNO, is adding in the Pb2+ solution and it is the slowest when urea is added in the Pb2+ solution. The repeated using property of the adsorbing resin R is better. The adsorption mechanism is explored by the adsorption isotherm, the adsorption kinetics and thermodynamics, and the change of the surface morphology, etc. The surface morphology and the grain distribution of the adsorbing resin R before adsorbing Pb2+ is uneven. And the grain structure of the surface before adsorbing Pb2+ is disrupted and the "white" spots obviously increased and gradually changed uniform when the adsorbing time increased. The Pb2+ adsorption process for the adsorbing resin R is fit for pseudo-first kinetic model, and AC is negative, and △S and △H is positive, that is, the adsorption process is spontaneous and the increasing temperature is favorable for the Pb2+ adsorption onto the adsorbing resin R.关键词
壳聚糖/吸附树脂/木粉/丙烯酸/丙烯酰胺/接枝共聚/吸附机制Key words
chitosan/ adsorbing resin/ wood flour/ acrylic acid/ acrylamide/ graft copolymerization/ adsorption mechanism分类
化学化工引用本文复制引用
谢建军,韩心强,张绘营,吴义强..木粉/壳聚糖接枝丙烯酸-丙烯酰胺吸附树脂对Pb2+的吸附[J].林业科学,2012,48(7):120-127,8.基金项目
国家林业公益性行业科研专项(201104004) （201104004）
湖南省自然科学基金重点资助项目(11JJ2021). （11JJ2021）
