Factors Rice straw Dragon tree leaves
X pH BD RF1 Average (%) RF2 Average (%)
-1 -1 -1 31.00 48.38
-1 -1 1 61.99 67.63
-1 1 -1 72.78 76.06
-1 1 1 82.30 79.40
1 -1 -1 7.79 13.03
1 -1 1 28.09 35.32
1 1 -1 27.27 45.44
1 1 1 60.91 55.16
Table 2: Experimental factorial design results for Cd(II) biosorption(X: metal ion concentration, pH: hydrogen ion concentration, BD: biomass dose)