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Polyethyleneimine-Modified Garden WasteBiochar: Preparation and Its Applicationfor Aqueous Cr(Ⅵ) Adsorption
Summary
Researchers synthesized polyethyleneimine-modified garden waste biochar and evaluated it as an adsorbent for hexavalent chromium removal from water, finding enhanced Cr(VI) uptake in both static and dynamic conditions due to increased surface amino groups and improved pore structure.
Garden Waste (GW) and Polyethyleneimine were used as source materials to create polyethyleneimine-modified garden waste biochar (PGWBC).The composite was employed as an adsorbent in both static and dynamic Cr(VI) adsorption experiments after being evaluated using N 2 adsorption-desorption and Fourier transform infrared spectroscopy.The material characterization results indicated that PGWBC was a mesoporous material that contained mainly narrow slit mesopores.The static adsorption data indicated that Cr(VI) adsorption by PGWBC was a pH-dependent process, a rise in pH from 2 to 9 resulting in a decrease in Cr(VI) adsorption from 44.6 mg/g to 3.8 mg/g.The adsorption process was endothermic and spontaneous, as characterized by the pseudo-second-order model and the Langmuir equation, the maximum Cr() uptake was 56.1 mg/g in 308 K.The dynamic adsorption revealed that increasing the flow rate impaired Cr(VI) adsorption, and the Thomas model was more suited to represent Cr(VI) adsorption by PGWBC than the Yoon-Nelson model.