Preparation of Biochar from Co-pyrolysis of Waste Mulching Film and Chili Straw and Its Treatment Capability toward Cd(Ⅱ)-containing Wastewater
To address the environmental issues caused by waste mulching film,develop reasonable ways to utilise its resources,and promote the green development of agriculture,this study focused on the co-pyrolysis of waste mulching film and chili straw,one of the agricultural wastes,to produce biochar.The study investigated the environmental applications and physicochemical properties of the biochar obtained.The results indicate that biochar prepared by co-pyrolysis of waste mulching film and chili straw at 700℃(M/C-700C)exhibits optimal adsorption performance for Cd(Ⅱ),with the adsorption capacity and the removal efficiency reaching 19.55 mg·g-1 and 97.44%respectively.Model analysis suggests that the adsorption process of M/C-700C for Cd(Ⅱ)belongs to a homogeneous monolayer,and chemically dominant process.M/C-700C is rich in surface oxygen functional groups,C=C bonds,and minerals,acting as efficient adsorption sites for Cd(Ⅱ).This study demonstrates that co-pyrolysis can be developed as an effective method for the resource utilisation of waste mulching film.
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