双组分阴离子染料在改性花生壳上的竞争吸附
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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。
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.
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.
引文
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[3] ZOU W,GAO S,LI K.Characterization of modified sawdust,kinetic and equilibrium study about methylene blue adsorption in batch mode[J].Korean Journal of Chemical Engineering,2013,30(1):111-122.
[4] FENG Y,ZHOU H,LIU G,et al.Methylene blue adsorption onto swede rape straw (Brassica napus L.) modified by tartaric acid:Equilibrium,kinetic and adsorption mechanisms[J].Bioresource Technology,2012(12):138-144.
[5] 张博文.铁改性花生壳生物炭吸附除磷性能及机理研究[D].北京:中国地质大学(北京),2018.
[6] 刘茹,倪伟迪,王春英.改性花生壳对水中磷的吸附特性[J].江苏农业科学,2017,45(24):255-258.
[7] 杨莉,赵晖.花生壳粉去除印染废水中活性染料的研究[J].湖北农业科学,2013,52(9):2035-2037.
[8] 杨国栋.花生壳对水中Cr(Ⅵ)的吸附性能研究[D].兰州:兰州理工大学,2009.
[9] 刘茹,王春英.环氧氯丙烷改性花生壳粉对孔雀绿染料的吸附性能[J].江苏农业科学,2014,42(12):389-391.
[10] 万鹏.花生壳作为吸附剂处理含铬Cr(Ⅵ)废水的研究[D].赣州:江西理工大学,2009.
[11] 林芳芳.改性花生壳对水中Cd～(2+)和Pb～(2+)的吸附特性研究[D].广州:华南理工大学,2011.
[12] 黄言秋,方芳,张璐璐,等.改性花生壳吸附剂对阴离子染料的吸附研究[J].净水技术,2019,38(2):69-76.
[13] 房文杰.染液中染料组分的浓度分析[D].上海:东华大学,2011.
[14] 于雪莲.分光光度法在多组分染料调色中的应用[J].染料与染色,2009,46(3):39-41.
[15] YAN Y,XIANG B,YI X,et al.Competitive adsorption of acid dyes from aqueous solution in diethylenetriamine-modified chitosan beads[J].Journal of Applied Polymer Science,2014(23):41168.
[16] WU Y,JIANG L,WEN YJ,et al.Biosorption of Basic Violet 5BN and Basic Green by waste brewery’s yeast from single and multicomponent systems[J].Environmental Science Pollution Research,2012,19(2):510-521.