【摘要】 以接枝法制备得到改性花生壳为吸附剂,研究在酸性橙(AO)和活性艳蓝(KN-R)双组分阴离子染料体系中,改性花生壳对两种染料的吸附去除情况,并通过吸附等温线模型和动力学模型,解析在双组分染料共存条件下,改性花生壳对两种染料的竞争吸附机制。结果表明,在双组分体系中,改性花生壳对AO和KN-R的吸附和单组分体系相似,符合Langmuir等温模型和准二级动力学模型。在反应120 min后,改性花生壳对AO和KN-R的吸附量均小于单组分体系下的吸附量,在溶液pH值为2、初始染料浓度为200 mg/L和温度为298 K的条件下,吸附量分别从243.4、360.9 mg/g降低到140.4、231.3 mg/g,改性花生壳对AO的吸附量下降极为显著,说明两种染料存在竞争吸附,染料分子大且磺胺基含量多的KN-R阻碍改性花生壳对AO的吸附。更多还原

【Abstract】 Modified peanut shells were prepared by grafting with diethylenetriamine using epichlorohydrin as etherifying agent. Then, under bi-component dye coexistence conditions, removal efficiency of acid orange(AO) and reactive brilliant blue(KN-R) by modified peanut shells were determined and adsorption isotherm model and dynamic model were used to explore the competitive adsorption of two dyes removal by modified peanut shells. The results showed that in binary system, the adsorption of AO and KN-R by modified peanut shells were fitted with Langmuir model and pseudo second order kinetic model, as the same in the single system. The adsorption capacities of modified peanut shells to AO and KN-R were less than in single system, especially for AO, after 120 min, reaction. When pH value of the solution was 2, initial dye concentration was 200 mg/L, and temperature was 298 K, adsorption capacity for AO and KN-R decreased from 243.4 mg/g and 360.9 mg/g to 140.4 mg/g and 231.3 mg/g, respectively. This meant that the two kinds of dyes were competed for adsorption, and adsorption of AO on modified peanut shells was hindered by KN-R with high molecular weight and more sulfanilamido.更多还原