Journal article
Nano-zerovalent manganese/biochar composite for the adsorptive and oxidative removal of Congo-red dye from aqueous solutions
Journal of Hazardous Materials, Vol.403, pp.1-11
05/02/2021
PMID: 33264930
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Abstract
Congo-red (CR), a precursor of textile products and a contaminant of great concern, has contaminated aquatic environments. Here, we explored the synthesis of mesoporous nano-zerovalent manganese (nZVMn) and Phoenix dactylifera leaves biochar (PBC) composite for the removal of CR from water. The nZVMn/PBC adsorbed 117.647 mg/g of CR versus 25.316 mg/g by PBC at [CR]0 = 20 mg/L and [PBC]0 = [nZVMn/PBC]0 = 500 mg/L. Variation of [nZVMn/PBC]0, [CR]0 and pH influenced the adsorption of CR. Freundlich adsorption isotherm and pseudo-first-order kinetic models best fitted CR adsorption. The H2O2 coupling with nZVMn/PBC promoted removal of CR possibly due to the formation of hydroxyl radical (●OH) and caused 95 % removal of CR versus 77 % by nZVMn/PBC alone. The ●OH scavengers inhibited the removal of CR. The nZVMn/PBC showed a good reusability and efficient removal of CR up to the seventh cycle of treatment. Results reveal that nZVMn improved performance, thermal stability and reusability of biochar. Degradation products from ●OH-mediated degradation of CR were studied by ultraperformance liquid chromatography with mass spectrometric detector to establish degradation pathways. The ion-chromatographic analysis showed the formation of non-toxic inorganic acetate product, which suggests high potential of the newly fabricated adsorbent in the removal of CR.
Details
- Title
- Nano-zerovalent manganese/biochar composite for the adsorptive and oxidative removal of Congo-red dye from aqueous solutions
- Creators
- Jibran Iqbal - Zayed UniversityNoor S Shah - COMSATS University IslamabadMurtaza Sayed - University of PeshawarNabeel Khan Niazi - University of Agriculture FaisalabadMuhammad Imran - Zayed UniversityJaved Ali Khan - University of PeshawarZia Ul Haq Khan - Zayed UniversityAseel Gamal Suliman Hussien - Khalifa University of Science and TechnologyKyriaki Polychronopoulou - Khalifa University of Science and TechnologyFares Howari - Zayed University
- Publication Details
- Journal of Hazardous Materials, Vol.403, pp.1-11
- Publisher
- Elsevier BV
- Grant note
- The authors acknowledge the support from Zayed University, Abu Dhabi, UAE under the RIF grant R19052 (to Dr. Jibran Iqbal) and Higher Education Commission, Pakistan project under the National Research Program for Universities, Grant No. 8301/Federal/ NRPU/R&D/HEC/2017 (to Dr. Noor S. Shah). Dr. Kyriaki Polychronopoulou would like to acknowledge support from Khalifa University through the RC2-2018-024.
- Identifiers
- 991012951194602368
- Copyright
- © 2020 Elsevier B.V. All rights reserved.
- Academic Unit
- School of Environment, Science and Engineering; Science; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article