organic pollutants Articles
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Property improvements of nano TiO2 in photodegradation of organic pollutions: a review
Nano TiO2 as a potential photocatalyst has been widely studied for application of environmental decontamination. In this paper, we examine and review the efforts in property improvements by modification, synthesis technique and operation parameter combined with some theory analysis. The effects of the modification by coupling with precious metal and narrow semiconductor, and doping with N, S, ...
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Immobilization of PDMS-SiO2-TiO2 composite for the photocatalytic degradation of dye AO-7
Crack-free PDMS-SiO2-TiO2 composite as photocatalyst was prepared for degrading dyes by using thin-film fixed bed reactor. The hydrophobic surface of the photocatalyst loaded with PDMS-SiO2-TiO2 composite could be considered as an extractant for organic pollutants. The effect of different supports including pumice stone, medicinal stone, and fiberglass for photocatalytic efficiency were ...
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Modified biopolymer adsorbent for the removal of dissolved organic pollutants
Chemically modified cellulose fibres were used as adsorbents for the removal of organic compounds and herbicides from water. The chemical modification of fibres by grafting hydrocarbon moieties enhances the adsorption capacity of cellulose substrate. The adsorption behaviour of the modified fibres towards various organic solutes and three herbicides was investigated. The viability of application ...
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Treatment of landfill leachate by effective microorganisms
Five dominant strains, capable of treating leachate effectively, were isolated. The results showed that the removal efficiency of COD by using the mixed strains was higher than the pure strain, reaching 46.8%. The optimal inoculum concentration and the treatment time were 10.0% and 120 h respectively. The removal rate of COD reached the maximum at the temperature of 35°C and pH of 7.0. The ...
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The removal of organic pollutants from industrial effluents via tapered bed adsorption columns
Tapered bed adsorption columns, using activated carbon, have been used to study the removal of two organic pollutants, an acid dye and para-chlorophenol, from aqueous effluent. Equilibrium sorption isotherms were measured to provide the saturation capacity (qe) of each pollutant by Chemviron Filtrasorb 400 carbon, for operating continuous adsorption columns. The three parameter Redlich-Peterson ...
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Effect of adsorption on the photocatalysis performance of anthraquinone dye
The adsorption and photocatalytic efficiency of several TiO2 suspended catalysts were compared to see how well they could degrade the organic pollutant anthraquinone dye Reactive Blue 2 (RB2). The adsorption of RB2 on catalysts follows the Langmuir model and adsorption capacity's influence on degradation performance has been established. Correlations between degradation kinetics and the amount of ...
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Nitrification of high salinity chemical effluents
1. The problem While during the biotreatment of non inhibitory chemical effluents containing 30 to 60 g/L salt the main part of organic pollutants (TOC, COD) do become degraded, is the nitrification of the present NH4N by suspended biomass because of high osmotic pressure in the reactor not possible. 2. The solution Lab scale tests have shown, that nitrification of these high saline effluents ...
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Metals and organic pollutants in snow surrounding an iron factory
Abstract To estimate air pollution snow samples were collected in March 2001 at six sites in the vicinity of the Kostomuksha factory in Karelia. Seventy-two chemical elements and more than 200 individual organic compounds were identified by inductively coupled plasma mass spectrometry (ICP-MS) and gas chromatography mass spectrometry (GC-MS). It was found that the levels of Li, B, Al, Fe, Ni, Cu, ...
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Kinetics of enhanced adsorption by polarization for organic pollutants on activated carbon fiber
The adsorption kinetics for model pollutants on activated carbon fiber (ACF) by polarization was investigated in this work. Kinetics data obtained for the adsorption of these model pollutants at open-circuit, 400 mV, and −400 mV polarization were applied to the Lagergren equation, and adsorption rate constants (K a) were determined. With the anodic polarization of 400 mV, the capacity of ...
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Sorption characteristics of phenanthrene and pyrene to surfactant-modified peat from aqueous solution: the contribution of partition and adsorption
In this paper, the sorption characteristics and mechanisms of phenanthrene and pyrene onto peat (PT) and surfactant-modified peat (MPT) were investigated. Sorption results fit closely to the Partition model and Freundlich model, the coefficient of determination (R2) were higher than 0.98 and 0.99, respectively. The contributions of partition and adsorption to the total sorption of phenanthrene ...
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Diatoms as bioindicators of pollution in the Mantaro River, Central Andes, Peru
Semi-quantitative analysis of two algal samples from the Mantaro River taken few kilometres downstream from La Oroya city at Junin, Peru, contained both organic-pollution tolerant and morphologically abnormal diatom associations. The organic pollution is inferred by elevated percentages of Nitzschia palea, Gomphonema parvulum and the Achnanthidium minutissimum complex; the total assemblage ...
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Land use patterns and organic pollution in the rivers
The riverine system is an important resource of water supply to the communities but rivers are being contaminated due to organic pollutants, which is a serious problem. Organic contamination has been discussed with regard to the different rivers of the world. Various organic pollutants, detected in water and the sediment of the rivers, have been reported. The effects of different land use ...
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Hybrid gas-liquid electrical discharge for degradation of organic pollutants in aqueous solution
Hybrid gas-liquid electrical discharge for degradation of phenol was investigated. The removal rate increased with decreasing the phenol initial concentration and adding some catalysts, such as Fe2+, Fe3+and H2O2. Augmenting the particle diameter of activated alumina or exchanging beadings as padding would lead to the reduction of the removal rate of phenol. Local discharge promoted the phenol ...
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Property improvements of nano TiO
2in photodegradation of organic pollutions: a reviewNano TiO2 as a potential photocatalyst has been widely studied for application of environmental decontamination. In this paper, we examine and review the efforts in property improvements by modification, synthesis technique and operation parameter combined with some theory analysis. The effects of the modification by coupling with precious metal and narrow semiconductor, and doping with N, S, ...
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TSCA, Treaties and Talk of Amendment
Untitled Document On July 29, 2003, the U.S. Senate Environment and Public Works (EPW) Committee approved legislation that would amend the Toxic Substances Control Act (TSCA) to allow the United States to ratify several international treaties intended to control persistent organic pollutants (POPs) and other hazardous substances. This column ...
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Laccase immobilized onto poly(GMA-MAA) microspheres for
p -benzenediol removal from wastewaterEnzymes have already been extensively applied to degrade various organic pollutants in industrial wastewater, and how to improve the stability and reusability of the enzymes is critical to their practical application. In this study, poly(glycidyl methacrylate-methacrylic acid), poly(GMA-MAA), microspheres were prepared by suspension polymerization, and were used as a new support to immobilize ...
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Preparation of Fe3O4/TiO2 magnetic mesoporous composites for photocatalytic degradation of organic pollutants
Fe3O4/TiO2 magnetic mesoporous composites were synthesized through a sol-gel method with tetra-n-butyl titanate as precursor and surfactant P123 as template. The as-prepared Fe3O4/TiO2 composites were characterized by X-ray diffraction, diffuse reflectance spectroscopy, nitrogen adsorption-desorption isotherm and pore size distribution. The as-synthesized products were applied as ...
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White Paper on chemicals and Stockholm Convention on persistent organic pollutants: perspectives for environmental risk management
The ever-growing attention to the environmental risk assessment of chemical substances has had considerable repercussions in the recent agreements reached within the European Union and on the international stage. In the conclusions on the European Commission's White Paper Strategy for a Future Chemicals Policy, the Council of the European Union recently referred to the need to include persistent, ...
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Preparation and selective adsorption of organic pollutants by an inorganic molecular imprinted polymer
A novel inorganic molecular imprinted polymer (MIP) was synthesized by adding Al3+ to the Fe/SiO2 gel with Acid Orange II (AO II) as the template. The MIP was characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy and nitrogen adsorption-desorption measurement. Compared with the non-imprinted polymer (NIP), the MIP enhanced the adsorption ...
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Using IPPC Process Tools to Promote BATs/BEPs Related to POPs
Under the Stockholm Convention on Persistent Organic Pollutants, the promotion of best available techniques (BATs) and promotion of application of best environmental practices (BEPs) became appriopriate. When applying BATs and BEPs for pollution sources, guidelines on BATs and BEPs should be adopted. The Conference of the Parties to the Stockholm Convention, at its 3rd meeting held in 2007, ...
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