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JSC maximal adsorption capacity, according to the Langmuir isotherm, was 11.429 mg/g (Table 1). The Elovich isotherm's reduced adsorption capacity (qm = 3.31 mg/g) and R2 (0.974) values show that it is unsuitable for explaining the adsorption process of Cr(VI) onto JSC (Figure 5(c)). Table 2 shows JSC's capability for absorption compared to other adsorbents defined in the literature. It indicates that Cr(VI) has a modest maximum monolayer adsorption capacity on JSC and that it is a good alternative adsorbent for the cleaning of heavy metal Cr(VI) from an aqueous solution because of its ease of availability, cheap cost, no secondary contamination, and environmental friendliness.

Table 2

Comparison of Cr(VI) adsorption capacity onto JSC with other adsorbents

AdsorbentsMaximum adsorption capacity (mg/g)pHReferences
Magnetic-modified corncob biochar 25.940 Van et al. (2019)  
Paper mill sludge-derived activated carbon 23.180 Gorzin & Abadi (2018)  
Jute stick charcoal (JSC) 11.429 This study 
Salix biomass-derived hydrochar 9.760 Lei et al. (2018)  
Freshwater snail shell-derived biosorbent 8.850 Zhang et al. (2018) 
Paper waste sludge derived hydrochar 5.940 Nguyen et al. (2021) 
Rice husk 3.780 Ghosh et al. (2018) 
Rice husk ash 2.270 Ghosh et al. (2018) 
AdsorbentsMaximum adsorption capacity (mg/g)pHReferences
Magnetic-modified corncob biochar 25.940 Van et al. (2019)  
Paper mill sludge-derived activated carbon 23.180 Gorzin & Abadi (2018)  
Jute stick charcoal (JSC) 11.429 This study 
Salix biomass-derived hydrochar 9.760 Lei et al. (2018)  
Freshwater snail shell-derived biosorbent 8.850 Zhang et al. (2018) 
Paper waste sludge derived hydrochar 5.940 Nguyen et al. (2021) 
Rice husk 3.780 Ghosh et al. (2018) 
Rice husk ash 2.270 Ghosh et al. (2018) 

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