Removal of Chromium (VI) and Lead (II) from Aqueous Solution Using Domestic Rice Husk Ash- (RHA-) Based Zeolite Faujasite

Table 1

Comparison of notable aluminium-rich zeolites for Pb(II) and Cr(VI) removal from aqueous solution.

Adsorbent	Silica source	Adsorbate	Capacity (mg/g)	Reference
Zeolite A	Red mud	Pb (II)	100	29
Zeolite X	Mixed of oil shale ash and coal fly ash	Pb (II) in mixed metal ion solution	112.5	27
Zeolite X	Coal fly ash	Pb (II)	314	30
Zeolite 13 X	Commercial	Cr (VI)	3.92	28
Natural zeolite	Not required	Cr (VI)	3.2	31
Zeolite NaP1	Coal fly ash	Cr(VI)	17.92	32
Zeolite FAU	Rice husk ash	Pb(II)	342.5	This study
Zeolite FAU	Rice husk ash	Cr(VI)	3.56	This study