Mostafa Khoshtabkh; Mahdi Nobahari; Seyed Mojtaba Movahedifar; Amin Honarbakhsh; Rahele Zhiani
Abstract
Nd2Sn2O7 nanoceramic was synthesized using an eco-friendly method with SnCl4•5H2O and Nd(NO3)3•6H2O. Structural analysis confirmed the formation of Nd2Sn2O7 nanoceramic with a size of 20±8 nm. Nd2Sn2O7 was thoroughly characterized using SEM, XRD, TGA, EDX, and TEM techniques. Due to ...
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Nd2Sn2O7 nanoceramic was synthesized using an eco-friendly method with SnCl4•5H2O and Nd(NO3)3•6H2O. Structural analysis confirmed the formation of Nd2Sn2O7 nanoceramic with a size of 20±8 nm. Nd2Sn2O7 was thoroughly characterized using SEM, XRD, TGA, EDX, and TEM techniques. Due to its high mechanical and long-term colloidal stability, large ionic character, and thermal stability, this system is considered an ideal nanocatalyst employing the host-guest approach. This green and environmentally friendly method was tested for the reduction of nitro-aromatic compounds using the synthesized Nd2Sn2O7 nanoceramic. The catalyst demonstrated easy and effective reusability after the reaction was completed under visible light irradiation.
Fatemeh Sabermahani; Iman Aminaei
Abstract
The coconut peel waste (CPW) was chemically spiked with silica nanoparticles to develop a novel nanocomposite (SiO2/CPW). The new nanocomposite was characterized by FTIR, SEM and Dynamic Light Scattering method. Adsorption of Cd ions onto SiO2/CPW was studied in batch mode as a function of pH, contact ...
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The coconut peel waste (CPW) was chemically spiked with silica nanoparticles to develop a novel nanocomposite (SiO2/CPW). The new nanocomposite was characterized by FTIR, SEM and Dynamic Light Scattering method. Adsorption of Cd ions onto SiO2/CPW was studied in batch mode as a function of pH, contact time, adsorbent dosage and initial concentration and temperature. The maximum removal of Cd2+ions was at pH=6.5 and adsorbent dosage=0.1 g. The experiments showed that the adsorption process was quick and about 74.5% of total cadmium was removed within 5 min. Cadmium uptake by the new adsorbent was best described by pseudo-second order model. Using the equilibrium concentration constants obtained at different temperatures, various thermodynamic parameters have been calculated. The results indicated that Cadmium adsorption was feasible, spontaneous, and endothermic. The suggested sorbent proved the great potential in cadmium removal from water and wastewater.
Fatemeh Sabermahani; Tayebeh Paykani; Samieh Fozooni
Volume 2, Issue 1 , March 2015, , Pages 7-13
Abstract
In the present work, a new kind of alumina-based adsorbent with high selectivity and stability and efficient adsorption was prepared. Alumina was coated with an oxazolone azo dye, 2-(4-{2-[4-(dimethylamino) phenyl]-1-diazenyl}phenyl)-4-[1-phenyl methylidene]-5(4H)-oxazolone, and then used for preconcentration ...
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In the present work, a new kind of alumina-based adsorbent with high selectivity and stability and efficient adsorption was prepared. Alumina was coated with an oxazolone azo dye, 2-(4-{2-[4-(dimethylamino) phenyl]-1-diazenyl}phenyl)-4-[1-phenyl methylidene]-5(4H)-oxazolone, and then used for preconcentration of trace amounts of palladium. The analytical procedure involved the complex formation of Pd with oxazolone azo dye as a chelating agent in buffer media of pH 5. The stability of sorbent was excellent and adsorption capacity did not change significantly after 100 consecutive uses of 50.0 mg of modified alumina. Under the optimum conditions, the preconcentration factor of the method was 150. The linearity was maintained in the concentration range of 0.33 ng mL-1 to 8.0 mg mL-1 in the original solution. For 2.0 µg mL-1 of Pd, the relative standard deviation 1.4% and detection limit 0.25 ng mL-1 was obtained. The proposed method was successfully applied to the determination of trace amounts of palladium in the anodic slime and wastewater samples.
