Adsorption and Fenton Synergistic Process Using Magnetic Co-Fe-Biochar Microsphere for the Removal of Dyes from Aqueous Solution

To attain a low-cost and high-efficient adsorbent and Fenton catalyst, sludge biochar/nano-cobalt(Co-Biochar) and sludge biochar/nano-cobalt/iron(Co-Fe-Biochar) composites were prepared to use as raw materials, and iron and nano-cobalt as modifiers with a hydrothermal method at 180°C for 3 h. The adsorption effect of different composite materials on low concentration Congo red dyes and synergistic effect of adsorption and high oxidation on high concentration Congo red dyes were studied. The results show that Co-Fe-Biochar has not only adsorption to Congo red dyes but also strong advanced oxidation. The removal rate of Co-Fe-Biochar to high concentration Congo red dyes is as high as 82%. Co-Fe-Biochar were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), nitrogen absorption and desorption(BET), hysteresis loop(VSM), and Fourier transform infrared spectrum(FTIR). It is known that the prepared composite material is a microsphere structure in which nano cobalt is the core and the iron carbon layer is the outer shell. Moreover, the addition of nano cobalt makes the composite have a porous morphology, with the specific surface area of the composite increased from 54.024 m^2/g to 117.753 m^2/g.

To attain a low-cost and high-efficient adsorbent and Fenton catalyst,sludge biochar/nano-cobalt(Co-Biochar)and sludge biochar/nano-cobalt/iron(Co-Fe-Biochar)composites were prepared to use as raw materials,and iron and nano-cobalt as modifiers with a hydrothermal method at 180℃ for 3 h.The adsorption effect of different composite materials on low concentration Congo red dyes and synergistic effect of adsorption and high oxidation on high concentration Congo red dyes were studied.The results show that Co-Fe-Biochar has not only adsorption to Congo red dyes but also strong advanced oxidation.The removal rate of Co-Fe-Biochar to high concentration Congo red dyes is as high as 82%.Co-Fe-Biochar were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),nitrogen absorption and desorption(BET),hysteresis loop(VSM),and Fourier transform infrared spectrum(FTIR).It is known that the prepared composite material is a microsphere structure in which nano cobalt is the core and the iron carbon layer is the outer shell.Moreover,the addition of nano cobalt makes the composite have a porous morphology,with the specific surface area of the composite increased from 54.024 m^2/g to 117.753 m^2/g.