Comparative Biosorption Studies of Hexavalent Chromium Ion onto Raw and Modified Palm Branches

Table 1

Physicochemical properties of the biosorbents.

Properties	PB	COPB	SOPB
pHPZC	6	7.3	7.5
Surface area, m^2/g	2.8	6.3	5.9
Total pore volume, cm^3/g	0.004	0.012	0.012
Average pore diameter, Å	9.9	12.5	19.5