Contribution of modified P-enriched biochar on pH buffering capacity of acidic soil.

Biochar can directly hold cations in soil because of the negative charge that exists on its surfaces. Besides, improving soil cation exchange capacity, the negative charges on biochar surfaces can buffer acid soil by protonation and deprotonation mechanisms. Moreover, biochar ameliorates soil acidity due to the presence of oxides, carbonates, and hydroxides of its basic cations (Ca, Na, K, and Mg).

Efficient aqueous molybdenum removal using commercial Douglas fir biochar and its iron oxide hybrids.

Molybdenum (Mo) is a naturally-occurring trace element in drinking water. Most commonly, molybdate anions (MoO) are in well water and breast milk. In addition, it is used in medical image testing.

Lead immobilization in simulated polluted soil by Douglas fir biochar-supported phosphate.

This study compared the lead (Pb) immobilization efficacy of biochar-supported phosphate to conventional in-situ heavy metal immobilization methods (with lime, neat biochar and phosphate). The biochar-supported phosphate was obtained by treating Douglas fir biochar (BC) with anhydrous calcium chloride and potassium dihydrogen phosphate. The amount of Pb immobilized was determined by comparing the concentration of ammonium nitrate extractable Pb lead from lead-spiked soil (without amendment) to that of a 30 d incubation with (a) lead-spiked soil plus 5% (wt.