University of Oulu

Rajendiran, R., Patchaiyappan, A., Harisingh, S., Balla, P., Paari, A., Ponnala, B., Perupogu, V., Lassi, U., & Seelam, P. K. (2022). Synergistic effects of graphene oxide grafted chitosan & decorated MnO2 nanorods composite materials application in efficient removal of toxic industrial dyes. Journal of Water Process Engineering, 47, 102704.

Synergistic effects of graphene oxide grafted chitosan & decorated MnO2 nanorods composite materials application in efficient removal of toxic industrial dyes

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Author: Rajendiran, Rajesh1; Patchaiyappan, Arunkumar2; Harisingh, Shankar3;
Organizations: 1Energy & Environmental Engineering Department, CSIR-Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India
2Department of Ecology and Environmental Sciences, Pondicherry University, Puducherry 605014, India
3Department of Physics, KPR Institute of Engineering and Technology, Coimbatore 641407, Tamil Nadu, India
4Department of Life Sciences, Christ University, Bangalore 560029, Karnataka, India
5Department of Chemistry, Pondicherry University, Puducherry 605014, India
6Sustainable Chemistry Research Unit, Faculty of Technology, P.O. Box 4300, University of Oulu, Oulu 90014, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.6 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2022-07-01


In this study, we designed a heterogeneous graphene oxide (GO) grafted on chitosan decorated with MnO2 nanorods (α-MnO2NRs/GO-Chit) composite materials and its ability to remove the cationic and anionic toxic dyes from wastewaters were analysed. The synthesised materials presented an effective stabilization of active MnO2 nanorods (NRs) on the GO-Chit surface. The synthesised materials were detailed characterised by several spectroscopic and microscopic techniques such as, FT-IR, P-XRD, SEM, TEM, Raman, TGA, XPS, BET, CO2-TPD and UV–Visible analysis. In addition, α-MnO2NRs/GO-Chit material is successfully applied in removal of industrial ionic dyes such as amido black 10B (AB) and methylene blue (MB), respectively. The dye adsorption experiments confirmed that the GO-Chit/α-MnO2 NRs material exhibited remarkably high adsorption capacity in efficient removal of cationic dye methylene blue (MB) and anionic dye amido black 10B (AB). The maximum MB dye removal (97%) process completed in 24 min at C0 = 30 mg·L-1, but in the case of AB the maximum dye removal (80%) process was reached in 700 min. Over GO-Chit/α-MnO2 NRs hybrid material, a maximum theoretical monolayer adsorption (qmax values is 328.9 mg g-1) of MB was calculated from the Langmuir isotherm equation. In case MB, a faster adsorption and 2.18 times maximum adsorption capacity was achieved than that of AB10 dye. The enhanced adsorption over α-MnO2NRs/GO-Chit is due to the increased surface functionalities (i.e., oxygen-containing groups), high basicity and strong electrostatic forces between MnO2 nanorods and GO-Chit. Furthermore, α-MnO2NRs/GO-Chit hybrid material displayed good stability after 10 successive adsorption tests.

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Series: Journal of water process engineering
ISSN: 2214-7144
ISSN-E: 2214-7144
ISSN-L: 2214-7144
Volume: 47
Article number: 102704
DOI: 10.1016/j.jwpe.2022.102704
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Funding: We acknowledge the Council of Scientific and Industrial Research (CSIR), New Delhi, India for the financial support (Project No. TSP-0063). The authors also thanks the Central Instrumentation Facility (CIF), Pondicherry University for the instrumentation support.
Dataset Reference: Supplementary data to this article can be found online at
Copyright information: © 2022 The Authors. This is an open access article under the CC BY license (