The functionalization of multi-walled carbon nanotubes (MWCNTs) was using with ethylenediamine and cyanuric chloride and sodium 2-mercaptoethanol as efficient ways to introduce amine and thiol functional groups onto the nanotube sidewalls. The synthesized amino and thiolated MWCNTs were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). A series of batch adsorption experiments were conducted to study the effect of pH, dose, metal concentration and temperature on Hg(II) uptake by the functionalized, MWCNTs. The isotherm data were analyzed for possible agreement with the Langmuir than Freundlich models, while the equilibrium data were fitted better by Langmuir model. The pseudo-first-order and pseudo-second-order rate equations were tested on kinetic
In this research, zinc oxide (ZnO) nanostructure was prepared by using zinc acetate (as precursor) and carboxylic derivative of activated carbon (as matrix). Activated carbon was modified by oxidation with nitric acid to get carboxylic derivative (AC-COOH). Then, zinc was loaded on the surface of modified activated carbon by an impregnation method. The ZnO nanostructure was characterized by BET, XRD and SEM that confirmed achieving of ZnO nanoparticles with a size of 21-31 nm and surface area of 17.78 m 2 gr −1. The efficiency of the catalyst was evaluated in the photocatalytic decomposition of aqueous solution of azo dye methyl orange (MO). Major parameters such as pH, dose of catalyst, stirring effect, initial concentration of dye and solution oxygen effect were considered. Activity measurements under UV radiation showed acceptable results for the photodegradation of MO. The efficiency of catalyst prepared with non-modified activated carbon for the photodegradation of MO was also evaluated. The results confirmed that ZnO prepared using carboxylic derivative of activated carbon as matrix had better photocatalytic activity than ZnO prepared by non-modified carbon matrix.
In the present study, the effects of initial COD (chemical oxygen demand), initial pH, Fe 2+ /H 2 O 2 molar ratio and UV contact time on COD removal from medium density fiberboard (MDF) wastewater using photo-assisted Fenton oxidation treatment were investigated. In order to optimize the removal efficiency, batch operations were carried out. The influence of the aforementioned parameters on COD removal efficiency was studied using response surface methodology (RSM). The optimal conditions for maximum COD removal efficiency from MDF wastewater under experimental conditions were obtained at initial COD of 4000 mg/L, Fe 2+ /H 2 O 2 molar ratio of 0.11, initial solution pH of 6.5 and UV contact time of 70 min. The obtained results for maximum COD removal efficiency of 96% revealed that photo-assisted Fenton oxidation is very effective for treating MDF wastewater.
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