Adsorption Ability for Toxic Chromium (VI) Ions in Aqueous Solution of Some Modified Oyster Shell Types

Table 3

Specific surface area, pore volume, and pore diameter of OS samples.

Sample	BET surface area (m^2/g)	t-plot micropore area (m^2/g)	t-plot external surface area (m^2/g)	t-plot micropore volume (cm^3/g)	BJH adsorption cumulative volume of pores (cm^3/g)	BJH adsorption average pore width (nm)
QNOS-PP	10.2962	0.7658	9.5304	0.000170	0.043458	19.1191
QNOS-PP-800	0.9719	0.0319	0.9399	0.000003	0.006084	27.5392
QNOS-PP-800-EDTA	4.7673	—	—	—	0.034279	29.7813
PYOS-PP	1.3476	0.1504	1.1972	0.000039	0.008170	28.5818
PYOS-PP-Na-800	1.8008	0.2097	1.5911	0.000096	0.009444	24.0858
PYOS-PP-Na-800-EDTA	1.1372	0.2245	0.9127	0.000073	0.007769	31.9977

Between 1.7000 nm and 300.0000 nm width.