Effect of Physical and Chemical Activation on the Removal of Hexavalent Chromium Ions Using Palm Tree Branches

Table 1

Characteristics of different adsorbents investigated.

Parameter	Adsorbents
	RPB	APBH 20	APBH 50	APBS	APBK
𝑆BET; (m^2 g^−1)	147	157	401.3	90	215
Pore volume; (cm^3 g^−1)	0.014	0.070	0.134	0.029	0.091
Pore radius (Å)	7.4	7.2	7.3	7.1	7.2
pHpzc	4.1	4.3	3.7	6.7	7.5