Migration of total petroleum hydrocarbon and heavy metal contaminants in the soil-groundwater interface of a petrochemical site using machine learning: impacts of convection and diffusion.

Convection and diffusion are key pathways for the migration of total petroleum hydrocarbons (TPH) and heavy metals (HMs) from soil to groundwater. However, the extent of their influence on pollutant migration, as well as the nonlinear relationships between these processes and pollutants, remains unclear. This study investigates the spatial distribution of TPH and HMs at a petrochemical site with complex hydrogeological conditions in southwestern China.

Ce/N @BC prepared based on plant metallurgy strategy: A novel activator of peroxymonosulfate for the degradation of sulfamethoxazole.

A novel carbon catalyst was created based on plant metallurgy strategy for organic pollutants removal. Plants rich in CeO NPs in water were used as carbon precursors and pyrolyzed with urea to obtain Ce/N co-doped carbon catalysts, which were used in the degradation of sulfamethoxazole (SMX) by active peroxymonosulfate (PMS). The results showed that the Ce/N @BC/PMS system achieved to 94.

Insights into the potential applications of permanganate/peroxymonosulfate systems: enhancement amorphous MnO, effects of water matrices, and optimization using response surface methodology.

In this study, we developed a novel self-catalytic oxidation system involving peroxymonosulfate (PMS) and permanganate (KMnO), named as CUPP, to efficiently mineralize sulfamethoxazole (SMX) in groundwater. It was found that amorphous MnO derived from the reduction of KMnO can directly adsorb HSO, a complex hydroxyl group, mediate the internal disproportionation reaction of HSO with the manganese complex, and effectively activate PMS, thereby promoting the oxidation of SMX and its degradation intermediates through sulfonate radiation. Furthermore, by using electron spin resonance (EPR), HPLC/MS full scan, and response surface methodology, the coexistence of HO˙, SO˙, O˙, O, and active chlorine (Cl, HOCl) in the CUPP system was confirmed.

Growth of Ag/g-CN nanocomposites on nickel foam to enhance photocatalytic degradation of formaldehyde under visible light.

Formaldehyde is a pollutant that significantly affects the indoor air quality. However, conventional remediation approaches can be challenging to deal with low-concentration formaldehyde in an indoor environment. In this study, Photocatalysts of Ag/graphitic carbon nitride (g-CN)/Ni with 3D reticulated coral structure were prepared by thermal polymerization and liquid phase photo-deposition, using nickel foam (NF) as the carrier.

Effect of vermiculite modified with nano-iron-based material on stabilization of lead in lead contaminated soil.

Lead (Pb) contamination arising from the production of lead-acid batteries is getting more severe, and research on its treatment technology reflects the increasing concern worldwide. Vermiculite is a mineral with a layered structure, containing hydrated magnesium aluminosilicate and has high porosity and large specific surface area. Vermiculite has the ability of improving soil permeability and water retention performance.

Natural siderite derivatives activated peroxydisulfate toward oxidation of organic contaminant: A green soil remediation strategy.

Natural siderite (FeCO), simulated synthetic siderite and nZVI/FeCO composite were used as green and easily available iron-based catalysts in peroxydisulfate activation for remediating 2-chlorophenol as the target contaminant and this technique can effectively degrade organic pollutants in the soil. The key reaction parameters such as catalysts dosage, oxidant concentration and pH, were investigated to evaluate the catalytic performance of different materials in catalytic systems. The buffering property of natural soil conduced satisfactory degradation performance in a wide pH range (3-10).