Halloysite nanotubes show selective desorption characteristics for anionic azo dyes. The dye desorption behaviors from halloysite using deionized water, strong acid and strong base were studied. Methyl orange was easily and completely eluted by deionized water, whereas Congo red is hardly desorbed even by strong acid or base.
H. Chen, J. Zhao, J. Wu and H. Yan, RSC Adv., 2014, 4, 15389 DOI: 10.1039/C3RA47561A
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