Table 8.

Adsorption capacities of different adsorbents towards removal of zinc(II) ions from aqua-solutions.

Adsorbent	qm (mg·g−1)	Reference
Rice straw biochar	38.6	Park et al. (2017) [14]
Biochar	35.75	Sanyang et al. (2014) [36]
Biochar	29.04	This study
Rapeseed waste	13.86	Paduraru et al. (2015) [37]
Corn straw biochar	11.0	Chen et al. (2011) [21]
Biochar	10.4	Cibati et al. (2017) [22]
Hardwood biochar	2.31	Jiang et al.(2016) [35]