Department of Material Sciences

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Author: search.filters.author.Gheid AbdelhakStart date: 2020

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    TOXICOLOGICAL EVALUATION OF A MONOAMMONIUM PHOSPHATE FERTILIZER IN RATS FOLLOWING 30 DAYS OF REPEATED ORAL EXPOSURE
    (Fresenius Environmental Bulletin, 2022) Araar Samia; Khaldi Fadila; Sayah Sarra; Chaib Sakina; Gheid Abdelhak
    The present study was undertaken to evaluate the subacute toxicity of a synthetic fertilizer widely used in agriculture (Phosfert®, monoammonium phosphate NH4H2PO4 (MAP)) on some haematolog-ical and biochemical profiles as well as liver and kid-ney histology in Wistar rats. MAP was administered to rats orally at 200, 400, and 800mg/kg of body weight doses for 30 days. Results showed decreased body weight and a significant increase in liver and kidney relative weights in MAP-treated rats. In ad-dition, hematotoxicity effect of high doses of MPA was evidenced by decreased levels of red blood cells (RBC), haemoglobin (Hb) and hematocrit (Ht) along with increased levels of white blood cell (WBC) counts. Further, hepatic and renal markers and lipid profiles were markedly increased however; total pro-teins and albumin levels were considerably de-creased in MAP treated rats as compared with con-trols. These effects were supported by the liver and kidney histopathological evaluations. Conclusively, the study proved that the long-term use and at higher doses of MAP may cause adverse hepatic and renal effects
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    Removal of Malachite Green Dye From Aqueous Media using Helianthus Annuus Seeds Shells as Eco-Friendly Adsorbent: Optimization, Equilibrium, and Kinetic Studies
    (Annals of R.S.C.B., 2021-05-08) Hichem Fiala; Hacene Bendjeffal; Hamrouni Achraf; Lahmar Amina; Berredjem Yamina; Hattab Zhour; Gheid Abdelhak
    The fat diffusion of organic dyes in our environment has become a very serious ecological problem, which needs the improvement of new and low-cost methods for their elimination from aquatic media. In this In this approach, we studied the use of the Helianthus annuus seeds shells as natural, low-cost and eco-friendly adsorbent for the removal of the malachite green (MG) from aqueous media. The Helianthus Annuus seeds shells (HA-Ss) were characterized using various techniques such as FTIR, SEM, and ATG. The sorption tests were performed according to the Batch system, under the effects of four physicochemical factors, including the adsorbent mass (0.0025 and 5 g.L-1), medium pH (1-10), MG initial concentration (10-50 mg/L), and temperature (25-45°C). The removal optimal condutions were found to be 2.5 g/L of Helianthus annuus seeds shells, 20 mg/L as MG initial concentration, and pH 7 for 60 minutes of contact time with a removal efficiency up to 99%. Several kinetic models including pseudo-first order and pseudo-second order were used to describe MG adsorption mechanism, the modeling studies indicated that adsorption mechanism follows the pseudo-second-order kinetic model, and the adsorption isotherms follow the Freundlich model with Qe reached 7.69 mg/g.