Removal of manganese by adsorption onto newly synthesized TiO2-based adsorbent during drinking water treatment

0547350 - ÚH 2024 RIV GB eng J - Journal Article
Fialová, Kateřina - Motlochová, Monika - Čermáková, Lenka - Novotná, Kateřina - Báčová, J. - Roušar, T. - Šubrt, Jan - Pivokonský, Martin
Removal of manganese by adsorption onto newly synthesized TiO2-based adsorbent during drinking water treatment.
Environmental Technology. Roč. 44, č. 9 (2023), s. 1322-1333. ISSN 0959-3330. E-ISSN 1479-487X
R&D Projects: GA MŠMT(CZ) LM2015073
Grant - others:AV ČR(CZ) StrategieAV21/20
Program: StrategieAV
Research Infrastructure: NanoEnviCz II - 90124
Institutional support: RVO:67985874 ; RVO:61388980
Keywords : adsorpiton * ion exchange * manganese * titanium dioxine * drinking water treatment
OECD category: Environmental sciences (social aspects to be 5.7); Inorganic and nuclear chemistry (UACH-T)
Impact factor: 2.8, year: 2022
Method of publishing: Limited access
https://www.tandfonline.com/doi/full/10.1080/09593330.2021.2000042

Manganese is naturally present in water, but its increased concentration in potable water is undesirable for multiple reasons. This study investigates an alternative method of demanganization by a newly synthesized TiO2-based adsorbent prepared through the transformation of titanyl sulphate monohydrate to amorphous sodium titanate. Its adsorption capacity for Mn2+ was determined, while a range of influential factors, such as the effect of contact time, adsorbent dosage, pH value, and added ions was evaluated. The adsorbent appeared highly effective for Mn2+ removal owing to its unique characteristics. Besides adsorption via electrostatic interactions, ion-exchange was also involved in the Mn2+ removal. Although the Mn2+ removal occurred within the whole investigated pH range of 4–8, the maximum was achieved at pH 7, with qe = 73.83 mg·g-1. Equilibrium data revealed a good correlation with Langmuir isotherm in the absence of any ions or in the presence of monovalent co-existing ions, while the results in the presence of divalent co-existing ions showed a better fit to Freundlich isotherm. Additionally, the presence of monovalent cations (Na+, K+) only slightly decreased the Mn2+ removal efficiency as compared to divalent cations (Ca2+, Mg2+) that caused a greater decrease. However, the effect of anions (Cl-, SO42-) was insignificant. To provide insight into the adsorbent safety, the toxicity assessment was performed and showed no harmful effect on cell activity. Furthermore, the residual concentration of titanium after adsorption was always below the detection limit. The results imply that the synthesized TiO2-based adsorbent is a safe promising alternative method for demanganization.
Permanent Link: https://hdl.handle.net/11104/0342285