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2 protocols using aluminum nitrate nonahydrate al no3 3 9h2o

1

Synthesis of Inorganic Compounds Using Analytical Reagents

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The analytical grade chemicals and materials, such as potassium chloride (KCl, Sigma, Germany), potassium bromide (KBr, Sigma-Aldrich, Germany), sulphuric acid (H2SO4, Merck, Germany), ethanol (C2H5OH, Merck, Germany), poly(vinylidene fluoride) (PVdF, Sigma-Aldrich, Germany), tungstic acid (H2WO4, Sigma, Japan), ammonium dihydrogen phosphate (NH4H2PO4, Sigma, Japan), chromium(iii) nitrate nonahydrate (Cr(NO3)3·9H2O, Merck, Germany), iron(iii) nitrate nonahydrate (Fe(NO3)3·9H2O, Merck, Germany), aluminum nitrate nonahydrate (Al(NO3)3·9H2O, Merck, Germany) as a source of trivalent cations, glycerin (Sigma-Aldrich, Germany), and graphite rods (Alfa Aesar, USA), were used without further purification. Distilled water was passed through HPLC grade water purification systems (BOECO, BOE 8082060, Germany) to yield de-ionized water (conductivity: 0.055 μS cm−1 at 25.0 °C) for use throughout the experiments.
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2

Synthesis and Characterization of Mo-LDH

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The chemicals necessary for the synthesis of the Mo-LDH phase, e.g., magnesium nitrate hexahydrate Mg(NO3)2∙6H2O, aluminum nitrate nonahydrate Al(NO3)3∙9H2O, sodium molybdate dihydrate Na2MoO4∙2H2O, anhydrous sodium carbonate Na2CO3, and sodium hydroxide NaOH (pearls), were all of chemical purity grade and were purchased from Merck (Darmstadt, Germany). For the preparation of the GO phase, graphite powder 325 mesh from Sigma–Aldrich (Saint Louis, MO, USA), sodium nitrate NaNO3, potassium permanganate KMnO4 (chemical purity from Merck), H2SO4 (98%), hydrochloric acid HCl 37% (from Merck), and hydrogen peroxide H2O2 30% (from ChimReactiv, Bucharest, Romania) were utilized.
Indigo carmine (IC) from Sigma–Aldrich (Saint Louis, MO, USA) was used to prepare the simulated dye-contaminated water in the laboratory.
All the aqueous solutions were obtained using distilled water with a conductivity of 2.5–5 μS/cm.
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