Reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites were prepared by chemical deposition method and were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, N₂-sorption and X-ray photoelectron spectroscopy (XPS). Operating parameters for the removal process of Pb(II) ions, such as temperature (20-40 °C), pH (3-5), initi...

MCM-41-supported nanoscale zero-valent iron (nZVI) was sytnhesized by impregnating the mesoporous silica martix with ferric chloride, followed by chemical reduction with NaHB4. The samples were studied with a combination of characterization techniques such as powder X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) and Mössbauer spectroscopy, N2 adsorption measurements, transmission e...

Highly promising artificial intelligence tools, including neural network (ANN), genetic algorithm (GA) and particle swarm optimization (PSO), were applied in the present study to develop an approach for the evaluation of Se(IV) removal from aqueous solutions by reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites. Both GA and PSO were used to optimize the parameters...

The green reduction method uses pomegranate peel extract as a reducing agent to prepare nZVI on Trametes suaveolens biochar(T-BC/nZVI) carrier for the removal of hexavalent chromium in aqueous solution. effects several factors, including different ratios between m(CS) and m(Fe), initial Cr(VI) concentrations, pH, temperature, were evaluated. When dosage was 5 g/L at pH = 2 concentration 50 mg/L...

For the prevention of freshwater reservoirs from contamination through industrial effluents, eco-friendly adsorbents with minimal aging impact are required. Here, redox-sensitive nanoscale zero-valent iron(nZVI) particles were supported on four different surfaces varying bentonite(B)/charcoal(C) ratio to mimic layered and porous surfaces. Different dyes, i.e. rhodamine-B(RB) methylene blue(MB) ...

Carbonaceous supports (e.g. biochar) have been widely applied to enhance the performance of nanoscale zero-valent iron (nZVI) for removing heavy metals arsenic; As) due their large surface areas (SSA) alleviate nZVI particles aggregation, while electrochemical properties are largely overlooked. Herein, role these two characteristics in enhancing As(III) removal has systematically investigated t...

The requirement of acidification for the successful Fenton processes in water treatment has promoted search new strategies to work at pH close neutrality. With this objective, use nZVI been evaluated oxidative elimination 10 mg L?1 atrazine circumneutral with nZVI/UVA, nZVI/H2O2, and nZVI/H2O2/UVA systems. While UVA irradiation sole was ineffective degrading herbicide, addition H2O2 boosted up ...

Background and Purpose:Organic dyes with a complex structure are often toxic, carcinogenic, mutagenic, non-biodegradation and stable in the environment and if released to the environment without treatment can endanger the environment and human health. The aim was to evaluate the performance nanoscalezero-valent iron (NZVI) in the removal of dye acid red 18 (AR18) from aqueous solutions. Materia...

Here we characterize the toxicity of environmentally-relevant forms of engineered nanomaterials (ENMs), which can transform during wastewater treatment and persist in aqueous effluents and biosolids. In an aerosol exposure scenario, cytotoxicity and genotoxicity of effluents and biosolids from lab-scale sequencing batch reactors (SBRs) to A549 human lung epithelial cells were examined. The SBRs...