AI Article Synopsis
- Coal-based humic acid residue (HAS) has potential as a nutrient-rich material for adsorbing harmful substances like mercury (Hg), and a modified version (N-HAS) was created to enhance its adsorption properties.
- N-HAS demonstrated a strong capacity for Hg removal, with a maximum adsorption of 124.20 mg/g and stable performance over multiple cycles, effectively lowering Hg levels in both maize and contaminated soil.
- The study highlighted that using N-HAS led to significant reductions in Hg content in maize kernels (up to 72.09%) and soil (up to 82.80%), with optimal results observed at an application rate of 0.4 kg/m.
Article Abstract
Coal-based humic acid residue (HAS), as a waste generated during humic acid production, has been gaining attention in recent years due to its adsorption capacity and containing nutrients. In this study, to improve the adsorption capacity of HAS for and Hg, phosphate-modified materials (N-HAS) were prepared by a hydrothermal method and HAS and N-HAS were characterized by scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), X-ray fluorescence (XRF); batch adsorption experiments investigated the adsorption capacity of N-HAS on Hg under different pH, and isothermal adsorption model and kinetic model fitted the adsorption process to explore the adsorption mechanism; the effects of various amounts of N-HAS on the Hg content in maize and the effective Hg in the soil under Hg-contaminated soil were investigated by field trial. The results showed that the pseudo-second-order kinetic model (R=0.9641) and Langmuir isothermal (R=0.95) adsorption model could better describe the adsorption behavior of N-HAR on Hg, the maximum adsorption amount was 124.20 mg/g, and the time to reach adsorption equilibrium was shorter for N-HAS compared to HAS; after 5 times of adsorption-desorption, the removal rate of Hg by N-HAS was still higher than 80%, with stable cyclic adsorption performance; the adsorption mechanism of Hg by N-HAS included physical adsorption, precipitation, and surface complexation, and compared with HAS, the percentage of complexation for Hg adsorption by N-HAS increased by 77.81%, and the percentage of precipitation increased by 7.68%; compared to the control group, it was shown that the addition of N-HAS significantly decreased (p < 0.05) the Hg content of maize kernels by 27.44% ∼ 72.09%, increased biomass by 4.34% ∼ 11.26%, and decreased the available Hg content in soil by 50.00% ∼ 82.80%. In addition, the addition of N-HAS at 0.4 kg/m was optimal for the field trial. The study showed that N-HAS not only achieved resource utilization but also demonstrated great potential for treating Hg in water and soil.
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| http://dx.doi.org/10.1016/j.envpol.2025.125657 | DOI Listing |
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