Table 2.

EDS analysis results of acid-washed sand, amino-functionalized sand, and rGO@sand

Element	Acid washed sand	Amino-functionalized sand	rGO@sand
C%	0.51	0.03	12.04
N%	2.7	5.10	0
O%	58.62	57.71	51.22
Al%	0.82	1.51	1.67
Si%	37.35	35.65	35.07