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In this study we investigated the efficacy of a novel material parthenium weed ( Parthenium hysterophorus  L.) biochar (PBC), iron doped zinc oxide nanoparticles ( n Fe-ZnO), and biochar modified with  n Fe-ZnO (Fe-ZnO@BC) to adsorb heavy metals (HMs) and reduce their uptake by wheat ( Triticum aestivum  L.) in a highly chromite mining contaminated soil. The co-application of the applied soil conditioners exhibited a positive effect on the immobilization and restricted the HMs uptake below their threshold levels in shoot content of wheat. The maximum adsorption capacity was because of large surface area, cation exchange capacity, surface precipitation, and complexation of the soil conditioners. The scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) showed porous smooth structure of parthenium weed derived biochar that helped in HMs adsorption, increase the efficiency of soil fertilizers and nutrients retention which help in the enhancement soil condition. Under different application rates the highest translocation factor (TFHMs) was obtained at 2 g  n Fe-ZnO rate followed the descending order: Mn &gt; Cr &gt; Cu &gt; Ni &gt; Pb. The overall TFHMs was found &lt;1.0 indicating that low content of HMs accumulation in roots from soil slight transferred to shoot, thus satisfying the remediation requirements.

international journal of phytoremediation

Comparative efficacy of  Parthenium hysterophorus  (L.) derived biochar and iron doped zinc oxide nanoparticle on heavy metals (HMs) mobility and its uptake by  Triticum aestivum  (L.) in chromite mining contaminated soils