含氮螯合树脂对复杂水体中铜的去除
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摘要
以M4195含氮螯合树脂为吸附剂,考察了不同酸度、盐度和螯合剂条件下其对Cu(Ⅱ)的吸附性能。实验结果表明,可以通过调节酸度来促进Cu(Ⅱ)的吸附。在Cu(Ⅱ)的单组分溶液中,酸度增加对Cu(Ⅱ)的吸附具有明显的促进效果,pH为5时,Cu(Ⅱ)的吸附量为0.82 mmol/g;pH为1时,Cu(Ⅱ)的吸附量增加到0.93 mmol/g。由于络合作用,螯合剂EDTA的引入会强烈抑制Cu(Ⅱ)的吸附,Cu(Ⅱ)的吸附量在pH为5时降低至0.24 mmol/g。由于静电屏蔽效应和桥联作用,NaCl和柠檬酸的存在对于Cu(Ⅱ)的吸附过程有较弱的促进效果,且该效果随酸增加而逐渐减弱,Cu(Ⅱ)的吸附量都保持在0.90 mmol/g左右。可见,M4195含氮螯合树脂可应用于复杂水体中铜离子的高效去除和分离回收。
引文
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[2]陈雅琼,于春波,高分子型重金属去除剂处理含铜废水[J].水处理技术,2016,42:99-102.
[3]Zeng G.,Liu Y.,Tang L,Yang G.,Pang Y.,Zhang Y.,Zhou Y.,Li Z.,Li M.,Lai M.,He X.,He Y.Enhancement of Cd(Ⅱ)adsorption by polyacrylic acid modified magnetic mesoporous carbon[J].Chemical Engineering Journal,2015,259:153-160.
[4]Tan P.,Sun J.,Hu Y.,Fang Z.,Bi Q.,Chen Y.,Cheng J.Adsorption of Cu~(2+),Cd~(2+)and Ni~(2+)from aqueous single metal solutions on graphene oxide membranes[J].Journal of Hazardous Materials,2015,297:251-260.
[5]Kolodynska D.The effects of the treatment conditions on metal ions removal in the presence of complexing agents of a new generation[J].Desalination,2010,263:159-169.
[6]Woowicz A.,Hubicki Z.The use of the chelating resin of a new generation Lewatit MonoPlus TP-220 with the bispicolylamine functional groups in the removal of selected metal ions from acidic solutions[J].Chemical Engineering Journal,2012,197:493-508.
[7]Gao J.,Liu F.,Ling P.,Lei J.,Li L,Li C.,Li A.High efficient removal of Cu(Ⅱ)by a chelating resin from strong acidic solutions:Complex formation and DFT certification[J].Chemical Engineering Journal,2013,222:240-247.