TY - JOUR

T1 - Photoadsorption of Cr(VI) on titanium dioxide modified by high-energy milling

AU - Pechishcheva, N. V.

AU - Ordinartsev, D. P.

AU - Valeeva, A. A.

AU - Zaitceva, P. V.

AU - Korobitsyna, A. D.

AU - Sushnikova, A. A.

AU - Petrova, S. A.

AU - Shunyaev, K. Yu.

AU - Rempel, A. A.

N1 - This work was supported by the Russian Science Foundation [grant number 21–73-20039]. The authors are grateful to the Russian Science Foundation (grant 21-73-20039) for financial support. The research results were obtained using the equipment of the National Center for Catalyst Research of Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences and the Collective Use Center Ural-M of the Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences. The authors would like to thank A.V. Varaksin for help in determining the specific surface area of titanium dioxide samples. The authors are grateful to the Russian Science Foundation (grant 21-73-20039) for financial support. The research results were obtained using the equipment of the National Center for Catalyst Research of Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences and the Collective Use Center Ural-M of the Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences. The authors would like to thank A.V. Varaksin for help in determining the specific surface area of titanium dioxide samples.

PY - 2023

Y1 - 2023

N2 - Microcrystalline powders of rutile and anatase were milled in a high-energy planetary mill down to obtain nanosized TiO2 powders (the size of coherent scattering region (CSR) about 30 nm and 60 nm, respectively). The resulting powders were characterized by HRTEM, Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the ξ-potential of the aqueous suspensions was determined. High-energy milling made it possible to significantly increase the ability of TiO2 to remove chromium from aqueous solutions. The effectiveness of the powders for not only Cr(VI) removing but also total chromium adsorption under UV-irradiation and short wavelength visible light has been shown. This is important, since Cr(III) does not remain in the aqueous medium and cannot be oxidized back to Cr(VI) under the influence of some environmental factors. It is possible to remove more than 99.9 % of total chromium and 100 % of chromium hexavalent from a 50 mg·L-1 solution of Cr(VI) using milled anatase. XPS showed that, upon the photoadsorption, Cr(VI) is reduced to Cr(III). The presence of an acetate buffer in the solution promotes the most efficient removal of chromium. This work shows a simple way to obtain a highly effective material with potential applications for the removal of high toxic hexavalent chromium from industrial wastewater. The milled anatase sample was successfully tested to remove Cr (VI) from a real wastewater sample. © 2023 Elsevier B.V.

AB - Microcrystalline powders of rutile and anatase were milled in a high-energy planetary mill down to obtain nanosized TiO2 powders (the size of coherent scattering region (CSR) about 30 nm and 60 nm, respectively). The resulting powders were characterized by HRTEM, Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the ξ-potential of the aqueous suspensions was determined. High-energy milling made it possible to significantly increase the ability of TiO2 to remove chromium from aqueous solutions. The effectiveness of the powders for not only Cr(VI) removing but also total chromium adsorption under UV-irradiation and short wavelength visible light has been shown. This is important, since Cr(III) does not remain in the aqueous medium and cannot be oxidized back to Cr(VI) under the influence of some environmental factors. It is possible to remove more than 99.9 % of total chromium and 100 % of chromium hexavalent from a 50 mg·L-1 solution of Cr(VI) using milled anatase. XPS showed that, upon the photoadsorption, Cr(VI) is reduced to Cr(III). The presence of an acetate buffer in the solution promotes the most efficient removal of chromium. This work shows a simple way to obtain a highly effective material with potential applications for the removal of high toxic hexavalent chromium from industrial wastewater. The milled anatase sample was successfully tested to remove Cr (VI) from a real wastewater sample. © 2023 Elsevier B.V.

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85163825526

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=001031874900001

U2 - 10.1016/j.inoche.2023.110968

DO - 10.1016/j.inoche.2023.110968

M3 - Article

VL - 154

JO - Inorganic Chemistry Communications

JF - Inorganic Chemistry Communications

SN - 1387-7003

M1 - 110968

ER -