Abstract: The graft copolymers of xanthan gum and acrylamide （XG-g-AM） were synthesized from xanthan gum by microwave irradiation with acrylamide as graft monomer，and the product was characterized by Fourier thransform infrared spectroscopy （FTIR） and X-ray diffraction （XRD）. The adsorption behavior of XG-g-AM for Cr³⁺ was investigated，and the adsorption thermodynamics was studied according to adsorption isotherm. The adsorption behavior of XG-g-AM for Cr³⁺ can be expressed by Freundlich adsorption isotherm equation in the temperature range of 298—318 K. The adsorption is a spontaneous and endothermic process with increased entropy，and the increase in temperature would benefit the adsorption.

摘要： 以黄原胶为原料，丙烯酰胺为接枝单体，采用微波辐射聚合得到了黄原胶-丙烯酰胺接枝共聚物（XG-g-AM)，利用红外光谱仪、X射线衍射仪对其结构进行表征。研究了 XG-g-AM对Cr³⁺的静态吸附行为，并根据吸附等温线研究了吸附热力学性质，结果表明：在研究的浓度范围内，XG-g-AM对Cr³⁺的吸附行为可用Freundlich等温式进行描述；吸附为自发的、吸热的熵增加过程，升高温度有利于吸附。