Regulating the exposed crystal facets of α-Fe2O3 to promote Fe2O3-modified biochar performance in heavy metals adsorption

alpha-Fe2O3 modified biochar (Fe2O3/BC) was prepared to remove Cu(II), Pb(II) and As(V). By adjusting the calci-nation temperature, the morphology and exposed crystal facets of alpha-Fe2O3 on the biochar were changed which further affected the adsorption performance. The kinetics and isotherms were investigated systematically to reveal adsorption effect of the adsorbent on Cu(II), Pb(II) and As(V). The results indicated that chemisorption process was the dominant adsorption mechanism. Fe2O3/BC-350 exhibited superior adsorption capacity for Cu (II) (258.22 mg/g) and Pb(II) (390.60 mg/g), and Fe2O3/BC-250 showed relatively good adsorption capacity for As(V) (5.78 mg/g). By adsorption mechanism analysis, electrostatic adsorption, ion exchange, precipitation and complexation were coexisted in the process of removing metal ions by Fe2O3/BC. The repeatability test and the effect of ion strength exhibited the strong stability of Fe2O3/BC. Meanwhile, density functional theory (DFT) calculations manifested that the (202) facet of alpha-Fe2O3 on Fe2O3/BC-350 possessed the lowest adsorption en-ergies of Cu(II) and Pb(II). While for As(V), it was the (104) facet of alpha-Fe2O3 on Fe2O3/BC-250 that exhibited the lowest adsorption energy. DFT results revealed that different Fe2O3/BC had different adsorption affinities to various heavy metals. In general, this work not only prepared a promising adsorbent via a simple procedure, but also served as a reference for researchers in designing absorbents with specific active facet for efficient heavy metals remediation.

Automated summary

By adjusting the calci-nation temperature, alpha-Fe2O3 modified biochar showed different morphology and crystal facets, affecting the adsorption performance. The chemisorption process was found to be the dominant adsorption mechanism. Fe2O3/BC-350 exhibited superior adsorption capacity for Cu (II) and Pb(II), while Fe2O3/BC-250 showed good adsorption capacity for As(V). DFT calculations revealed that different Fe2O3/BC had different adsorption affinities to various heavy metals.