Next Article in Journal
Comparing Composition Control Structures for Kaibel Distillation Columns
Previous Article in Journal
Thermodynamic Analysis of Supercritical Carbon Dioxide Cycle for Internal Combustion Engine Waste Heat Recovery
Open AccessFeature PaperArticle

Wastewater Treatment from Lead and Strontium by Potassium Polytitanates: Kinetic Analysis and Adsorption Mechanism

1
Department of Chemistry and Technology of Materials, Yuri Gagarin State Technical University of Saratov, 77 Polytecnicheskaya Street, 410054 Saratov, Russia
2
Department of Materials Science, National Research Tomsk Polytechnic University, 30 Lenina Аvenue, 634050 Tomsk, Russia
3
Tobolsk Complex Scientific Station, Ural Branch of the Russian Academy of Science, 15 Osipov Academician Street, 626152 Tobolsk, Russia
4
Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology “MISiS”, 4 Leninsky Avenue, 119049 Moscow, Russia
5
Engineering Center, Plekhanov Russian University of Economics, 36 Stremyanny Lane, Moscow 117997, Russia
6
Metallurgical and Materials Engineering Department, University of Nigeria, Nsukka 410001, Nigeria
*
Author to whom correspondence should be addressed.
Processes 2020, 8(2), 217; https://doi.org/10.3390/pr8020217 (registering DOI)
Received: 23 December 2019 / Revised: 6 February 2020 / Accepted: 7 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Synthesis and Application of Nano- and Microdispersed Systems)
The reduction of heavy and radioactive metal pollution of industrial wastewater remains a vital challenge. Due to layered structure and developed surface, potassium polytitanate had potential in becoming an effective sorbent for metal extraction from wastewater in the presented paper. On the basis of the different sorption models, this paper studied the mechanism of Pb2+ and Sr2+ cation extraction from aqueous solution by non-crystalline potassium polytitanate produced by molten salt synthesis. The ion exchange during metal extraction from model solutions was proven by kinetic analysis of ion concentration change, electronic microscopy, and X-ray fluorescence analysis of sorbent before and after sorption, as well as by theoretical modeling of potassium, lead, and strontium polytitanates. The sorption was limited by the inner diffusion in the potassium polytitanate (PPT) interlayer space, as was shown using the Boyd diffusion model. The sorption processes can be described by Ho and McKay’s pseudo-second-order model compared to the Lagergren pseudo-first-order model according to kinetic analysis. It was found that the ultimate sorption capacity of synthesized sorbent reached about 714.3 and 344.8 (ions mg/sorbent grams) for Pb2+ and Sr2+ ions, respectively, which was up to four times higher than sorption capacity of the well-known analogues. Therefore, the presented study showed that potassium polytitanate can be considered as a promising product for industry-scaled wastewater purification in practice.
Keywords: sorption; heavy metals; radioactive metals; potassium titanate; ion exchange sorption; heavy metals; radioactive metals; potassium titanate; ion exchange
Show Figures

Graphical abstract

MDPI and ACS Style

Ermolenko, A.; Shevelev, A.; Vikulova, M.; Blagova, T.; Altukhov, S.; Gorokhovsky, A.; Godymchuk, A.; Burmistrov, I.; Offor, P.O. Wastewater Treatment from Lead and Strontium by Potassium Polytitanates: Kinetic Analysis and Adsorption Mechanism. Processes 2020, 8, 217.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop