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American Journal of Analytical Chemistry 2014年第8期5卷 445-454页

作者： said alahiane Samir Qourzal Mahmoud El Ouardi Abdelhadi Abaamrane Ali Assabbane Physical Chemistry Laboratory Photocatalysis and Environment Team Department of Chemistry Faculty of Science Ibn Zohr University Agadir Morocco

The photocatalytic degradation of the synthetic textile dye Reactive Yellow 145 (RY 145) in aqueous solution, using TiO2 coated non-woven fibers as photocatalyst, under UV-lamp irradiation, was studied. The effects of the operational parameters such as initial dye concentration, pH, addition of oxidant hydrogen peroxide and addition of ethanol on the reaction rate were investigated. The effect of some inorganic ions such as and , commonly present in real effluents, on the photodegradation of RY 145 was also examined. The experimental results showed that the photocatalytic degradation rate was favoured by a high concentration of solution in respect to Langmuir-Hinshelwood model. The maximum rate of complete decolorization of RY 145 was observed in the acidic medium at pH 3. The presence of and anions led to an increase of the effectiveness of the photocatalytic degradation. However, the presence of and anions decreased differently the photodegradation reaction rate. TiO2/UV process was proved to be capable of the complete degradation of the RY 145.

关键词： Photocatalytic Degradation Immobilized TiO2 Reactive Yellow 145 Water Treatment

Effective Removal of Nitrates Ions from Aqueous Solution Using New Clay as Potential Low-Cost Adsorbent

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Journal of Encapsulation and Adsorption Sciences 2015年第4期5卷 178-190页

作者： Mahmoud El Ouardi Samir Qourzal said alahiane Ali Assabbane Jamaa Douch Photocatalysis and Environment Team Physical Chemistry Laboratory Department of Chemistry Faculty of Science Ibn Zohr University Agadir Morocco

In the present study, we investigated the performance of clay mineral originated from a dam situated in Morocco (Agadir city), as natural, low-cost, alternative and eco-friendly adsorbent for removal of nitrates ions from aqueous solution within a batch process. The clay was characterized by X-ray diffraction, Scanning Electron Microscopy (SEM), Dispersive Energy of Spectroscopy (EDS), Fourier Transform Infrared (FTIR) and surface area analysis (BET). The effects of various experimental parameters are examined such as contact time, initial concentration of pollutant, adsorbent mass and solution pH. The removal of nitrate was 71.89% at natural pH (pH = 5.1) using 1 g/l of adsorbent in 500 ml of nitrate solution having initial concentration of 300 mg/l (effect of contact time). Adsorption kinetic study revealed that the adsorption process followed first order kinetic. Theoretical correlation of the experimental equilibrium adsorption data for the Nitrate-New Clay system was properly explained by the Langmuir isotherm model. The maximum adsorption capacity was Qm, exp = 244.06 mg/g at 20℃ and at natural pH (with Qm, cal = 250 mg/g). An increase in adsorbent dosage increased the percent removal of nitrate, R = 1 g/l was considered as optimum dose and was used for further study. The pH heavily affected the adsorption capacity, and the percentage removal was found to decrease with increase in pH. The obtained results indicated that this New Clay (NC) was very good adsorbent for NO3-, interesting alternative material with respect to more costly adsorbent used, and could be used as a highly efficient adsorbent for the separation of nitrate from drinking or waste water.

关键词： New Clay Adsorption Capacity Isotherms Nitrate Removal Waste Water

Removal of Carbaryl Pesticide from Aqueous Solution by Adsorption on Local Clay in Agadir

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American Journal of Analytical Chemistry 2013年第7期4卷 72-79页

作者： Mahmoud El Ouardi said alahiane Samir Qourzal Abdelhadi Abaamrane Ali Assabbane Jamaa Douch Physical Chemistry Laboratory Photocatalysis and Environment Team Department of Chemistry Faculty of ScienceIbn Zohr University Agadir Morocco

This study was conducted to assess the removal efficiency of pesticide (Carbaryl) used in Souss Massa region (Agadir city), on a clay originated from barrage situated in Agadir. The adsorption of Carbaryl from aqueous solution by local clay as a low-cost, natural and eco-friendly adsorbent was investigated. Different physicochemical parameters were analyzed: adsorbent mass, ionic strength (NaNO3), initial concentration of pollutant, temperature, and pH. The empirical results showed that all these parameters have an impact on the retention of pesticide on the clay. The equilibrium uptake was increased with an increase in the initial pesticide concentration in solution. The results of adsorption were fitted to the Langmuir and Freundlich isotherms. The Freundlich model represented the adsorption process better than Langmuir model, with correlation coefficients (R2) values ranged from 0.97 to 0.99. This study has shown that the natural clay is a solid that has got an important adsorption capacity, which may be used in treatment and depollution of water.

关键词： Carbaryl Clay Adsorption Isotherms Water Treatment

Practical Method Proposed to Estimate Silting’s Rate in Small and Hillside Dams

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Journal of Water Resource and Protection 2014年第10期6卷 930-943页

作者： Naima alahiane Ahmed El Mouden Abderrahmane Ait Lhaj said Boutaleb Laboratory of Applied Geology and Geo-Environment Faculty of Science Ibn Zohr University Agadir Morocco National Agency for Development of Oasis Areas and Argan Administrative District Agadir Morocco

The construction of small dams and hillside reservoirs is a common practice for dealing with erratic and unevenly distributed rainfalls in arid and semi arid areas. Moreover, these small hydraulics structures are recommended as a solution to adapt to climate change in rural areas. They are fundamental for the sustainability of the water resources. However, these dams are potential sinks for upstream sediment. Therefore, it would be useful to monitor and measure the amount of sediments in small dams because it is necessary to understand siltation and better functioning of these vital structures. This control and these measurements require the application of the bathymetry or topography surveys which is too expensive for the responsible of these small dams. In this context, this paper proposes a simple and low cost method called: Triangulation of the estimated silted level. This method is based on direct measurement of the accessible silted level in dam. This new method is compared with another method based on the initial Elevation-Capacity curve of dam, usually used when the bathymetry is not attainable. The results of both of them have been verified with those of the bathymetry and electrical tomography methods and validated the proposal method as the most approximate. Therefore, this method is recommended as a new direct and simple technique to evaluate the amount of silting in small dams and hillside reservoirs.

关键词： Small Dams Evaluate Silting Bathymetry Triangulation