Sequential Abatement of FeII and CrVI Water Pollution by Use of Walnut Shell-Based Adsorbents
| Autor: | Marius Gheju, Ionel Balcu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Bioengineering
02 engineering and technology 010501 environmental sciences lcsh:Chemical technology 01 natural sciences lcsh:Chemistry Sodium borohydride chemistry.chemical_compound Adsorption TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY sustainable water treatment Chemical Engineering (miscellaneous) lcsh:TP1-1185 Hexavalent chromium Water pollution water treatment residuals heavy metals 0105 earth and related environmental sciences hexavalent chromium Aqueous solution Process Chemistry and Technology innovative adsorbent 021001 nanoscience & nanotechnology Acid mine drainage Pulp and paper industry Incineration lcsh:QD1-999 chemistry Water treatment 0210 nano-technology acid mine drainage |
| Zdroj: | Processes Volume 9 Issue 2 Processes, Vol 9, Iss 218, p 218 (2021) |
| ISSN: | 2227-9717 |
| DOI: | 10.3390/pr9020218 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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