Characteristics of a Novel Decomposed Corn Straw-Sludge Biochar and Its Mechanism of Removing Cadmium from Water

The utilization of high-efficiency adsorption materials to reduce cadmium pollution in aquatic environments is the focus current environmental remediation research. Straw waste and sludge, which are available huge amounts, can be best utilized preparation materials. In this study, six types biochar (SBC, CBC, DBC, SD1BC, SRDBC, SCDBC) were prepared from straw sludge by co-pyrolysis, their mechanisms explored. Cd(II) isotherms kinetics on determined fitted different models. Kinetic modeling was used characterize biochar, findings revealed process sorption followed pseudo-second-order (R2 > 0.96). Langmuir model accurately represented adsorption, indicating that monolayer controlled chemical adsorption. SCDBC had highest capacity for (72.2 mg g–1), 1.5 times greater than 3 corn biochar. As pH level rose within range 5.0 7.0 ionic strength decreased, experienced an increase. contained CaCO3 mineral crystals before CdCO3 found after adsorbing via X-ray diffraction analysis; peak Cd could observed Fourier transform infrared spectroscopy Cd(II). possible occurred primarily surface complexation with active sites, precipitation inorganic anions, coordination π electrons. Collectively, study suggested particularly SCDBC, as highly efficient adsorbents removal environments.