To create the biochar, it was initially washed using tap water to eliminate any impurities. After removing the ash content, the biochar was subjected to meticulous rinsing with deionized water to completely remove any residual ash residues. The biochar was allowed to air-dry in a well-ventilated environment until it was dry. Subsequently, the deashed biochar was appropriately stored for future utilization [12 (link), 29 ].
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