Study on improvement of copper sulfide acid soil properties and mechanism of metal ion fixation based on Fe-biochar composite

Abstract

In this study, Fe modification of bamboo biochar (BC) with ferrate was used to construct a composite soil amendment based on K2FeO4-biochar (Fe-BC) system. Based on soil culture experiments, Fe-BC combined with organic–inorganic materials at the application levels of 3%, 5% and 10% to copper sulfide contaminated acid soil was studied. Adsorption kinetics experiment was used to investigate the adsorption capacity of Fe-modified biochar to heavy metal Cu. The results showed that the pH value of bamboo biochar could be increased by 1.12 units after K2FeO4 modification. Compared with the BC, the adsorption capacity of Cu2+ increased from 190.48 to 276.12 mg/g, which was mainly reflected in single-layer surface adsorption and chemisorption. Pore diffusion, electrostatic interaction and surface interaction are the possible mechanisms of Fe-BC interaction with Cu2+ ions. And the contents of Pb, Cu and Zn in soil leaching state decreased by 59.20%, 65.88% and 57.88%, respectively, at the 10% application level of Fe-BC. In general, the composite modifier based on ferrate and biochar has a positive effect on improving the characteristics of acidic soil in copper mining area.

Bamboo-Based Biochar: A Still Too Little-Studied Black Gold and Its Current Applications

“…Soil organic matter (SOM) facilitated the immobilization of activated copper [ 161 ]. In the same year, Zhang et al prepared a ferrate-modified BBC and tested it as a composite system for soil amendment [ 162 ]. Particularly, the capacity of Fe-modified BBC to absorb heavy metal Cu and to reduce soil acidity was investigated [ 162 ].…”

“…In the same year, Zhang et al prepared a ferrate-modified BBC and tested it as a composite system for soil amendment [ 162 ]. Particularly, the capacity of Fe-modified BBC to absorb heavy metal Cu and to reduce soil acidity was investigated [ 162 ]. An absorption efficiency of 276.12 mg/g due to single-layer surface adsorption and chemisorption processes was evidenced.…”

“…An absorption efficiency of 276.12 mg/g due to single-layer surface adsorption and chemisorption processes was evidenced. Pore diffusion, electrostatic interaction, and surface interaction were the other possible mechanisms of Fe–BBC interaction with Cu 2+ ions [ 162 ]. Multilayer self-assembled multifunctional bamboo shoot shell biochar microspheres (BSSBMs) showed a wide range of adsorption capacities, demonstrating the capability of absorbing heavy metals such as Ag (I) and Pd (II), antibiotics such as TC, and dyes such as MB from wastewater [ 163 ].…”

Polyurethane reinforced with micro/nano waste slag as a shielding panel for photons (experimental and theoretical study)

“…Every year, about 100–130 million tons of iron slag (IS) are produced as byproducts of steel production in Basic Oxygen Furnace (BOF). The average quantity of iron slag is about 80–120 kg per ton of steel 6 – 8 . As a result, they use of iron slag (IS) in the concrete industry is gaining popularity 9 .…”