Waste-to-wealth application of wastewater treatment algae-derived hydrochar for Pb(II) adsorption.

ABSTRACT: Hydrochar, as an energy-lean solid waste, is generated from an advanced biofuel conversion technique hydrothermal liquefaction (HTL) and always leads to environmental pollution without appropriate disposal. In this study, HTL-derived hydrochar is recycled and prepared as adsorbent used for Pb(Ⅱ) removal from wastewater. As the original porous structure of hydrochar is masked by oily volatiles remained after HTL, two types of oil-removal pretreatment (Soxhlet extraction and CO₂ activation) are explored. The result shows that CO₂ activation significantly enhances the adsorption capacity of Pb(Ⅱ), and the maximum adsorption capacity is 12.88 mg g^-1, as evaluated using Langmuir adsorption model. Further, apart from oily volatiles, most inorganic compounds deriv

SUBMITTER: Yu J 

PROVIDER: S-EPMC8374291 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature