Abstract: Fabricating a wood-plastic composite includes capturing carbon dioxide from air, providing the carbon dioxide to algae, harvesting the algae, liquefying the algae to yield biochar, treating the biochar to yield functionalized carbon, and combining the functionalized carbon, wood flour, and a plastic feedstock to yield the wood-plastic composite. A wood-plastic composite includes mixed waste plastic, wood flour, and functionalized carbon.

Abstract: A modified bitumen composition includes bitumen, biomass oil including one or more phenolic compounds, and added sulfur. The modified bitumen composition includes between about 5 wt% and about 25 wt% of the added sulfur, at least some of the added sulfur is present as polysulfide chains, and at least some of the one or more phenolic compounds are configured to covalently bind to the polysulfide chains. Making a modified bitumen includes combining bitumen and elemental sulfur to yield sulfur-extended bitumen, and combining the sulfur-extended bitumen with biomass oil including one or more phenolic compounds to yield the modified bitumen.