Abstract
BackgroundIn this research, nZVI-PCB material was produced to efficiently remediation of chromium pollution in the water environment, and further explore its removal mechanism, which provide a broad prospect for the treatment of chromium pollution. MethodsNano zero-valent iron was loaded on the potamogeton·crispus biochar (PCB) produced at different pyrolysis temperatures were recorded as nZVI-PCB300, nZVI-PCB500, and nZVI-PCB700. Adsorption isotherms, kinetics, coexisting anion experiments were carried out. SEM, BET, EPR, XPS, etc. were employed to characterize the adsorbent before and after adsorption. Significant findingsThe nZVI-PCB is proportional to the pyrolysis temperature, and the pore size is inversely proportional to it. Electrochemical analysis showed that nZVI-PCB700 exhibited better electron transfer capability. The process of Cr(VI) being adsorbed by nZVI-PCB is more in line with the model of pseudo-second-order kinetic and Freundlich. The initial pH value had a significant effect on the ability of nZVI-PCB to remove Cr(VI), while the presence of Cl− and SO42− had no significant effect on the removal of Cr (VI). Electron paramagnetic resonance (EPR) spectroscopy showed that free radicals were involved in the adsorption process. The primary detoxification pathway of Cr(VI) was reduction, adsorption, and precipitation.
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