Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies

Table 7

Comparison of maximum adsorption capacity of several treated rice husks from different geographical regions and variable experimental conditions.

NaOH concentration	Time of treatment (h)	Drying time (h)	Drying temperature (°C)	(mg/g)	Rice husk origin	References
0.5 M	4		40°C	20	India (Asia)	[39]
0.1 M	24	24	80°C	1.58	China (Asia)	[40]
0.013 M	4		45°C	8.5	Malaysia (Asia)	[37]
2%	4	24	60°C		Malaysia (Asia)	[41]
0.1 M	1	48	80°C	2.8	China (Asia)	[38]
(1 : 1)			50°C	16	Malaysia (Asia)	[42]
0.3 M	17	6	70°C	11.06	Perú (South America)	Present work