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Se(IV) sorption on purified Na-kaolinite was investigated under ambient temperature as functions of contact time, pH, ionic strength and Se(IV) concentration using batch techniques. The rate of sorption is relatively rapid and sorption kinetics of Se(IV) can be successfully described by the pseudo-second-order model. The amount of Se(IV) sorbed was moderately dependent on the solution pH but insensitive to ionic strengths. The sorption/desorption isotherms of Se(IV) show that the sorption process is reversible. A double layer model was set up and used to quantitatively interpret the experimental data. Three surface complexes (≡Al)SeO, ≡ AlSeO and ≡AlOHSeO were proposed which satisfactorily fit our data. [ABSTRACT FROM AUTHOR]

Highlights: [•] Experiment data for the interactions between SA with Cu(II) at the surface of MWCNTs. [•] π–π Bonds sites perform quantitative modeling of adsorption by DLM model. [•] Cu(II) and SA sorption to MWCNTs can be well described with the DLM model. [•] The interactions with SA/Cu(II)/MWCNTs can be well predicted with the DLM model. [Copyright &y& Elsevier]