Expression of concern: Sonochemistry: a good, fast and clean method to promote the removal of Cu(II) and Cr(VI) by MWCNT/CoFe2O4@PEI nanocomposites: optimization study

Expression of concern for ‘Sonochemistry: a good, fast and clean method to promote the removal of Cu(II) and Cr(VI) by MWCNT/CoFe2O4@PEI nanocomposites: optimization study’ by Mohammad Hassan Omidi et al., New J. Chem., 2018, 42, 16307–16328, https://doi.org/10.1039/C8NJ03277G.

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