DOI：10.31220/agriRxiv.2022.00160

Characterization of biochars obtained from rose stems, coffee pulp, palm, and wood residues as an environmental alternative for cadmium immobilization in soil.

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  Abstract: Abstract Cadmium (Cd) presence in soils has received considerable research attention worldwide due to representing a risk to human health. Biochar obtained from agricultural residues presents a feasible solution for reducing Cd-presence in soils. The objective of this study was to characterize the physicochemical properties and Cd immobilization mechanism of biochar derived from palm empty fruit bunches (PEFBB), palm kernel (PKB), the coffee pulp (CPB), rose stems (RSB), and wood waste (WWB). Biochars characterization was done via proximal and ultimate analysis, particle size distribution, bulk and real density, porosity, scanning electron microscopy (SEM), Raman and Fourier transform infrared (FTIR) spectroscopy, water retention, cation exchange capacity (CEC), nutrient content, and pH. Adsorption isotherms were performed to evaluate the capacity of biochars to mitigate Cadmium pollution. Results indicated high fixed carbon content (55%) in PKB and WWBR, high ash content in RSB (50%), high moisture retention capacity and porosity (~75%) in PEFBB and RSB, and high CEC (45 cmol+ Kg-1) for PEFBB and CPB: All biochars presented alkaline properties and thus are suitable also for amending acidic soils. Moreover, RSB and WWB showed the greatest potential to adsorb Cd, with adsorption percentages over 80% for all evaluated concentrations. Likewise, desorption capacity was low for all the biochars studied (0.6%), proving to be useful for the remediation of soils containing cadmium. Furthermore, the biochars studied have potential in agricultural interest for soil amendment, like carbon nutrient recycling (RSB), physical properties (PEFBB and RSB), and low fertility (PEFBB, CPB, and RSB).

  Key words: rsb; biochars; pefbb; cpb; palm; presenc

  提交时间：2022-01-01

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