Fig. 5From: Impact of carbonization conditions and adsorbate nature on the performance of activated carbon in water treatmentReprinted with permission from Elsevier License Number: 5,601,360,125,916SEM images of activated carbons prepared from paulownia wood chemically activated using different mass of phosphoric acid to wood powder ratios at 400 °C: (a) 1:1; (b) 2:1; (c) 3:1; (d) 4:1 [53]. Back to article page