Improving remineralization and manganese-removal of soft waters using a mixed CaCO3/MgO contactor

Szymoniak, Lena; Claveau-Mallet, Dominique; Haddad, Maryam; Barbeau, Benoît

doi:10.1016/j.jwpe.2022.102995

Cited by 1 publication

(1 citation statement)

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“…There have been some studies on methods for the removal of manganese from a solution, such as the oxidation precipitation method [ 16 ], the ion exchange method [ 17 ], the reverse osmosis method [ 18 ] and the adsorption method, which is the more commonly used removal method [ 19 , 20 , 21 ]. Recently, with the development of nanomaterials, carbon nanotubes have been reported as the new adsorbents for the removal of heavy metal and organic pollution, such as chlorobenzenes, herbicides, heavy metal ions (Pb 2+ and Ca 2+ ), and inorganic nonmetallic ions, including F − [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization

Zhou

Mao

et al. 2023

Molecules

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Multiwalled carbon nanotubes (MWCNTs) were modified by oxidation and acidification with concentrated HNO3 and H2SO4, and the modified multiwalled carbon nanotubes (M-MWCNTs) and raw MWCNTs were characterized by several analytical techniques. Then the demanganization effects of MWCNTs and M-MWCNTs were well investigated and elucidated. The experimental data demonstrated that the adsorption efficiency of Mn(II) could be greatly promoted by M-MWCNTs from about 20% to 75%, and the optimal adsorption time was 6 h and the optimal pH was 6. The results of the kinetic model studies showed that Mn(II) removal by M-MWCNTs followed the pseudo-second-order model. Isothermal studies were conducted and the results demonstrated that the experimental data fitted well with the three models. The reliability of the experimental results was well verified by PSO–BP simulation, and the present conclusion could be used as a condition for further simulation. The research results provide a potential technology for promoting the removal of manganese from wastewater; at the same time, the application of various mathematical models also provides more scientific ideas for the research of the mechanism of adsorption of heavy metals by nanomaterials.

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