Fig. 7
From: Enhanced adsorption of phenol using EDTA-4Na- and KOH-modified almond shell biochar
Effect of initial pH on phenol adsorption by A-BC. Experimental conditions: A-BC dosage, 1.0 g L−1; initial phenol concentration, 400 mg L−1; initial pH of the solution ranging from 2 to 9; contact time, 240 min; solution volume, 20 mL; temperature, 25 °C