Biosorptive Removal of Cadmium(II) and Copper(II) Using Microwave-Assisted Thiourea-Modified Sorghum bicolor Agrowaste

Table 1

Physiochemical analysis of biosorbent samples.

Characterization	Parameters	SB	TSB
Element examination	C (%)	44.47 ± 0.50	44.31 ± 0.29
	H (%)	6.94 ± 0.06	7.04 ± 0.03
	N (%)	0.85 ± 0.04	9.32 ± 0.06
	S (%)	0.17 ± 0.02	4.76 ± 0.04
Boehm’s titration	Total acidic groups (mmol/g)	8.42 ± 0.03	8.04 ± 0.02
	Carboxylic (mmol/g)	6.51 ± 0.03	6.16 ± 0.02
	Lactones (mmol/g)	1.17 ± 0.03	1.19 ± 0.02
	Phenols (mmol/g)	0.74 ± 0.03	0.68 ± 0.02
	Total basic groups (mmol/g)	3.18 ± 0.02	3.95 ± 0.02
pHpzc		5.9	6.7