Artificial landscape water pollution has become a worldwide environmental problem in recent years. The paper presents a fuzzy analytic hierarchy process (FAHP) to establish comprehensive evaluation system of artificia...
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Converter slag-coal cinder filters were effective for phosphorous removal and advanced wastewater treatment. Seven converter slag-coal cinder filters in column experiments were designed for investigating the influence...
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Mixing converter slag and coal cinder as substrates of filters for phosphorous removal from domestic wastewater was studied in the column experiments. Three converter slag-coal cinder filter columns: Column 1# (V conv...
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Health risk from exposure of perfluorochemicals to wildlife and human has been a subject of concern in many fields such as environmental ecology, toxicology, pathology and life sciences. The interactions of perfluoroo...
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Health risk from exposure of perfluorochemicals to wildlife and human has been a subject of concern in many fields such as environmental ecology, toxicology, pathology and life sciences. The interactions of perfluorooctanoic acid (PFOA) with DNA were investigated by equilibrium dialysis, circular dichroism and isothermal titration calorimetry techniques under normal physiological conditions in vitro. The binding of PFOA to DNA was a non-covalent interaction and corresponded to the Langmuir adsorption isotherm in a two-step binding model, in which PFOA climbed along the backbones of DNA and then interacted with the homolateral bases via hydrophobic interactions. The saturation number of PFOA was calculated to be 0.64 per base-pair of DNA. Such an interaction caused the enhancement of circular dichroism spectra of DNA at both 245 and 275 nm, indicating the change of DNA conformation. The acidic media, low electrolyte and temperature ≤35 ℃ are comparatively more favorable for PFOA binding to DNA. This work provides a useful experimental strategy for studying the interactions of perfluorochemicals with biomacromolecules, aiming at a better understanding of the gene toxicity mechanism of perfluorochemicals.
The microsurface adsorption‐spectral correction (MSASC) technique has been described. The formation of the double electrostatic films in nucleic acids causes the monolayer aggregation of stain molecules. The interact...
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The microsurface adsorption‐spectral correction (MSASC) technique has been described. The formation of the double electrostatic films in nucleic acids causes the monolayer aggregation of stain molecules. The interaction of thionin (TN) with nucleic acids, ctD‐NA, sDNA and yRNA, has been investigated at pH 7.8. Results show that the binding ratios of TN to ctDNA‐P, sDNA‐P and yR‐NA‐P are 1.27, 1.30 and 1.40, respectively, the binding constants of the aggregates are 2.8 · 10 4 , 9.10 · 10 4 and 6.49 · 10 3 and their molar absorptivities are 1.04 · 10 4 , 1.25 · 10 4 and · 10 4 L· mol −1 , cm −1 at 630 nm. The aggregation may be applied to the spectrophotometric detection of nucleic acids samples.
Bisphenol A (BPA) removal from surface water in the presence of natural organic matter (NOM) by combination of powdered activated carbon (PAC) adsorption and ultrafiltration (UF) was investigated in this study. It was...
Bisphenol A (BPA) removal from surface water in the presence of natural organic matter (NOM) by combination of powdered activated carbon (PAC) adsorption and ultrafiltration (UF) was investigated in this study. It was especially focused on the effects of various factors on BPA removal, such as PAC dosage, NOM concentration and pH value. BPA removal by UF+PAC process increased sharply from 4% to 92%, when PAC dosage increased from 0 to 120 mg/L. The optimal PAC dosage was determined to be 30 mg/L. The results also showed that BPA retention was slightly favored in the presence of NOM. As pH increased from 7.0 to 10.5, BPA removal substantially decreased from 90% to 59%. PAC+UF process is recommended to be used as an emergence facility in drinking water treatment, especially when an accidental spilling of deleterious substance, e.g., BPA, in the water resources happens.
The degradation of Microcystin-LR (MC-LR) in water by hydrogen peroxide assisted ultraviolet (UV/H2O2) process was investigated in this paper. The UV/H2O2 process appeared to be effective in removal of the MC-LR. MC-L...
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The degradation of Microcystin-LR (MC-LR) in water by hydrogen peroxide assisted ultraviolet (UV/H2O2) process was investigated in this paper. The UV/H2O2 process appeared to be effective in removal of the MC-LR. MC-LR decomposition was primarily ascribed to production of strong and nonselective oxidant-hydroxyl radicals within the system. The intensity of UV radiation, initial concentration of MC-LR, MC-LR purity, dosages of H2O2, the initial solution pH, and anions present in water, to some extent, influenced the degradation rate of MC-LR. A modified pseudo-first-order kinetic model was developed to predict the removal efficiency under different experimental conditions.
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