Material

qm (mg/g)

Source

CuO nanostructures

125 (Pb2+)

[36]

Rice husk

133.34 (Cu2+)

[27]

Rice husk

45.5 (Pb2+)

[15]

Prosopis juliflora

201.08 (Cu2+)

[20]

Cymbopogon citrusstem

1000 (Pb2+)

[37]

Wasted black tea

166.67 (Cu2+)

[38]

F. natalensis fruits biochar

1250 (Pb2+)

Current study

161.29 (Cu2+)