Indoor Air Remediation Using Biochar from Bark: Impact of Particle Size and Pollutant Concentration

Figure 1

SEM images of the biochar samples with different particle sizes at different magnifications: (a–g) ×250, (h, k, m, n) ×25K, (i, l) ×10 K, and (h–n) ×15K.

(a) P6

(b) P5

(c) P4

(d) P3

(e) P2

(f) P1

(g) BM

(h) P6

(i) P5

(j) P4

(k) P3

(l) P2

(m) P1

(n) BM