Fig. 9
From: Enhanced adsorption of phenol using EDTA-4Na- and KOH-modified almond shell biochar
Effect of contact time on phenol adsorption by A-BC. Experimental conditions: dosage of A-BC, 1.0 g L−1; initial phenol concentration, 400 mg L−1, initial pH of solution unadjusted; contact time, 0–360 min; solution volume, 20 mL; temperature, 25 °C