This study investigated the desorption characteristics of red mud and loess with an optimum mass
ratio (RM-L73) loaded with Mn²⁺ and Cd²⁺ in neutral and acidic environments through batch desorption
tests. The desorption mechanism was clarified by understanding the capture mechanism of RM-L73
and establishing desorption isotherms. Furthermore, the effect of coexisting ions on RM-L73’s removal
efficiency was examined by batch adsorption tests. Results indicate that the -OH groups in RM-L73
play a substantial role in capturing Mn²⁺ and Cd²⁺ from acidic wastewater and considerably enhance
the adsorption effect of RM-L73. Additionally, Cd²⁺ was more sensitive to environmental pH levels than
Mn²⁺, and a desorption distribution coefficient was introduced to characterize the ease of desorption.
Coexisting ions had antagonistic effects on the removal of Mn²⁺ and Cd²⁺. The inhibitory effect generally
intensified with increasing initial concentration of Cd²⁺. However, the inhibitory effect on Mn²⁺ could be
mitigated at high concentrations. Cu²⁺ significantly reduced the adsorption capacity of RM-L73 for Mn²⁺
and Cd²⁺, with a stronger effect on Mn²⁺.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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