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Article

Sequential Abatement of FeII and CrVI Water Pollution by Use of Walnut Shell-Based Adsorbents

by 1,* and 2
1
Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan Nr. 6, 300223 Timisoara, Romania
2
National Institute for Research and Development in Electrochemistry and Condensed Matter, Str. Dr. Aurel Paunescu Podeanu Nr. 144, 300587 Timisoara, Romania
*
Author to whom correspondence should be addressed.
Processes 2021, 9(2), 218; https://doi.org/10.3390/pr9020218
Received: 20 December 2020 / Revised: 21 January 2021 / Accepted: 22 January 2021 / Published: 25 January 2021
(This article belongs to the Special Issue New Processes: Working towards a Sustainable Society)
In this study walnut shells, an inexpensive and readily available waste, were used as carbonaceous precursor for preparation of an innovative adsorbent (walnut-shell powder (WSP)) which was successfully tested for the removal of FeII from synthetic acid mine drainage (AMD). Then, the exhausted iron-contaminated adsorbent (WSP-FeII) was recovered and treated with sodium borohydride for the reduction of adsorbed FeII to Fe0. The resulting material (WSP-Fe0) was subsequently tested for the removal of CrVI from aqueous solutions. Treatability batch experiments were employed for both FeII and CrVI-contaminated solutions, and the influence of some important experimental parameters was studied. In addition, the experimental data was interpreted by applying three kinetic models and the mechanism of heavy metal removal was discussed. The overall data presented in this study indicated that fresh WSP and WSP-Fe0 can be considered as promising materials for the removal of FeII and CrVI, respectively. Furthermore, the present work clearly showed that water treatment residuals may be converted in upgraded materials, which can be successfully applied in subsequent water treatment processes. This is an example of sustainable and environmentally-friendly solution that may reduce the adverse effects associated with wastes and delay expensive disposal methods such as landfilling or incineration. View Full-Text
Keywords: sustainable water treatment; water treatment residuals; innovative adsorbent; heavy metals; acid mine drainage; hexavalent chromium sustainable water treatment; water treatment residuals; innovative adsorbent; heavy metals; acid mine drainage; hexavalent chromium
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MDPI and ACS Style

Gheju, M.; Balcu, I. Sequential Abatement of FeII and CrVI Water Pollution by Use of Walnut Shell-Based Adsorbents. Processes 2021, 9, 218. https://doi.org/10.3390/pr9020218

AMA Style

Gheju M, Balcu I. Sequential Abatement of FeII and CrVI Water Pollution by Use of Walnut Shell-Based Adsorbents. Processes. 2021; 9(2):218. https://doi.org/10.3390/pr9020218

Chicago/Turabian Style

Gheju, Marius, and Ionel Balcu. 2021. "Sequential Abatement of FeII and CrVI Water Pollution by Use of Walnut Shell-Based Adsorbents" Processes 9, no. 2: 218. https://doi.org/10.3390/pr9020218

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