Experimental study demonstrates efficient cadmium removal from aqueous solution using bamboo and wood biochar, highlighting cost-effective options for heavy metal remediation.
Biochar may potentially absorb heavy metals from aqueous solutions. In this study, biochar was derived from the pyrolysis (~600C) of 11 plants that are widely distributed across the mid-west forest land of China. The three kinds of biochar with the highest cadmium (Cd) adsorption capacities were further investigated to establish their adsorption kinetics and isotherms. The results showed that biochar derived from walnut trees (W-Biochar), wild cherry trees (C-Biochar), and bamboo (B-Biochar) had the greatest adsorption capacity. Their order was B-Biochar (19.12 mg/g) > C-Biochar (18.8 mg g) > W-Biochar (18.06 mg/g). The optimal biochar dosage was 2 g/L at pH = 5. A pseudo-second-order model explained the adsorption kinetics with rate constants of 0.043 gmg -1 min -1 (B-Biochar), 0.321 gmg -1 min -1 (C-Biochar), and 0.157 gmg -1 min -1 (W-Biochar). It took 40 min to reach adsorption equilibrium, which was responsible for the Langmuir isotherm. The Fourier Transform Infrared spectrophotometer (FTIR) results showed that the hydroxyl and carboxyl groups on the biochar surface improved Cd 2+ adsorption. The scanning electron microscope results showed that the three biochars had different microstructures, which were probably responsible for their different adsorption capacities.
No takes yet. Share an insight, caveat, or question.
Wu et al. (2019) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: