磷酸化壳聚糖对镉离子的吸附研究
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摘要
通过对壳聚糖(CS)进行磷酸化改性,文章制备了N-亚甲基磷酸壳聚糖(MPCS)吸附剂,探讨了MPCS对溶液中Cd~(2+)的吸附性能和吸附机理。结果表明:MPCS的吸附性能优于CS;MPCS用量为0.15 g,温度为303 K时,吸附率达到98.46%;其吸附行为符合Langmuir吸附模型,MPCS对Cd~(2+)的最大饱和吸附容量为105.26 mg/g;MPCS对镉离子的吸附机理,主要是通过氨基以及磷酸酯基对Cd~(2+)进行配位作用。
N-methylene phosphate chitosan(MPCS) adsorbent was prepared by phosphorylation modification of chitosan(CS),and discussed its adsorption performance and mechanism on Cd~(2+). The results showed that MPCS has higher adsorption performance than CS.The adsorption rate of Cd~(2+) was 98.46%, when the MPCS was 0.15 g and the temperature was 303 K.The MPCS adsorption behavior fitted the Langmuir model, while its maximum adsorption capacities of Cd~(2+) was 105.26 mg/g.The adsorption mechanism of MPCS on Cd~(2+) was mainly due to the coordination on Cd~(2+) by amino and phosphate ester group.
N-methylene phosphate chitosan(MPCS) adsorbent was prepared by phosphorylation modification of chitosan(CS),and discussed its adsorption performance and mechanism on Cd~(2+). The results showed that MPCS has higher adsorption performance than CS.The adsorption rate of Cd~(2+) was 98.46%, when the MPCS was 0.15 g and the temperature was 303 K.The MPCS adsorption behavior fitted the Langmuir model, while its maximum adsorption capacities of Cd~(2+) was 105.26 mg/g.The adsorption mechanism of MPCS on Cd~(2+) was mainly due to the coordination on Cd~(2+) by amino and phosphate ester group.
引文
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[4]张灿,丁娅,杨波,等.N-亚甲基磷酸盐壳聚糖衍生物的设计、合成和表征[J].中国天然药物,2004,2(2):94-98.Zhang Can,Ding Ya,Yang Bo,et al.Design,synthesis and characterization of N-methylene phosphonic chitosan derivatives[J].Chinese Journal of Natural Medicines,2004,2(2):94-98.
[5]宋小荣,任勤,范松林,等.壳聚糖磷酸酯糖用澄清剂的制备及结构表征[J].中国调味品,2017,42(10):23-28.Song Xiaorong,Ren Qin,Fan Songlin,et al.Preparation and structural characterization of chitosan phosphateas sugarcane juice clarifying agent[J].China Condiment,2017,42(10):23-28.
[6]宋庆平,王崇侠.交联羧甲基壳聚糖对铅离子的吸附研究[J].化学研究与应用,2013,25(4):541-546.Song Qingping,Wang Chongxia.Study on adsorption properties of crosslinked carboxymethyl chitosan towards Pb2+[J].Chemical Research and Application,2013,25(4):541-546.
[7]钱丽娟,胡佩卓,牟婉君,等.铀酰离子在磷酸锆上的吸附性能[J].核化学与放射化学,2010,32(4):216-220.Qian Lijuan,Hu Peizhou,Mu Wanjun,et al.Sorption of uranium(Ⅵ)onto zirconium phosphate surface[J].Journal of Nuclear and Radiochemistry,2010,32(4):216-220.
[8]徐沛楷.新型多用途的赘合剂-有机膦酸类化合物[J].化学试剂,1981(6):25-30.Xu Peikai.A new multipurpose excrescence agent-organic phosphonates[J].Chemical Reagents,1981(6):25-30.
[9]武汉大学.分析化学[M].第五版.高等教育出版社,2006:167-172.
[10]Li Ronghua,Liang Wen,Huang Hui,et al.Removal of cadmium(Ⅱ)cations from an aqueous solution with aminothiourea chitosan strengthened magnetic biochar[J].Journal of Applied Polymer Science,2018,135(19):46239.
[11]郝红英,何孟常,林春野.采用XPS研究镉在蒙脱石表面的吸附机理[J].环境化学,2007,26(6):797-800.