Table 2 Determination of the parameters for the Freundlich and Langmuir adsorption isotherm by test fit approach in experiment of lead adsorption to fruit tree pruning waste-derived biochars

Pear

y = 0.3817x + 0.5798 (r = 0.984**)

y = 0.0381x + 0.3982 (r = 0.949**)

Apple

y = 0.3748x + 0.3418 (r = 0.980**)

y = 0.0566x + 1.2086 (r = 0.955**)

Persimmon

y = 0.3841x + 0.3798 (r = 0.979**)

y = 0.0502x + 1.1153 (r = 0.991**)