Table 3.

Comparison of ZnOBBNC with reported adsorbents.

Adsorbents	Maximum Adsorption Capacity	References

Ferric oxides/biochar hybrid adsorbent	0.963 mg. g⁻¹ for 2 g in 250 mL.	Jing et al. (2015)
${SiO}_{2^{-}}$ biochar nanocomposites	98.2 mg. g⁻¹ and 159.4 mg.g⁻¹ for 0.05 g in 50 mL	Wang et al. (2016a, 2016b)
Ca impregnated biochar	105.41 mg. g⁻¹ for 0.1 g in 50 mL.	Liu et al. (2016)
Waste-marine microalgae derived biochar	32.57 mg. g⁻¹ for 0.2 g in 100 mL.	Jung et al. (2016)
${MgCl}_{2^{-}}$ modified biochar	100 mg. g⁻¹ for 0.1 g in 50 mL.	Gong et al. (2017)
Iron-modified biochars	111 mg. g⁻¹ for 0.2 g in 100 mL.	Yang et al. (2018)
Calcium-flour biochar	314.22 mg. g⁻¹ for 0.1 g in 1 L.	Wang et al.(2018a, 2018b)
Magnesium-pretreated biochar	66.7 mg. g⁻¹ for 2 g in 1 L.	Haddad et al. (2018)
$La {(OH)}_{3^{-}}$ modified magnetic pineapple biochar	101.16 mg. g⁻¹ for 0.025 g in 25 mL.	Liao et al. (2018)
Al-modified biochar	57.49 mg. g⁻¹ for 0.1 g in 50 mL.	Yin et al. (2018a)
Mg-Al-modified biochar	74.47 mg. g⁻¹ for 0.1 g in 50 mL.	Yin et al. (2018b)
Biochar-MgAl LDH Nanocomposites	177.97 mg. g⁻¹ for 5 mg in 40 mL.	Alagha et al. (2020)
Phosphogypsum biochar	102.4 mg. g⁻¹ for 0.025–0.2 mg in 40 mL.	Wang et al. (2020)
ZnOBBNC	265.50 mg. g⁻¹ for 3 g in 1 L.	This study