Effect of different water conditions on dissolution of nanosilver

2013 ◽  
Vol 68 (8) ◽  
pp. 1745-1750 ◽  
Author(s):  
Shao-Feng Chen ◽  
Hongyin Zhang ◽  
Qing-Yu Lin
Keyword(s):  
Inductively Coupled Plasma ◽  
Natural Waters ◽  
Atomic Emission ◽  
Rate Coefficients ◽  
Dissolution Behavior ◽  
Order Kinetic ◽  
First Order ◽  
Inductively Coupled ◽  
Water Conditions ◽  
Order Kinetic Model

This study evaluates the time-dependent dissolution of nanosilver (nAg) in common electrolytes and natural waters. nAg was synthesized via Tollens’ method using sodium citrate as stabilizer; its morphology, UV–Vis spectrum, and particle size were characterized. The dissolved silver was monitored over time using filtration, centrifugation, and inductively coupled plasma atomic emission spectroscopy (ICP-AES). Our results indicated that nanoparticle aggregation, Cl− presence, and natural organic compounds could affect the dissolution behavior of nAg. The dissolution of nAg was highly dependent on Cl− concentration. Excessive Cl− enhanced nanoparticle dissolution, whereas natural organic compound inhibited the dissolution. The dissolution data fitted well with the first-order kinetic model, and the dissolution rate coefficients were calculated using the first-order equation. This study showed the dissolution of nAg under various water conditions. The obtained results may be helpful in predicting nAg behavior in relevant environmental aquatic systems.

scholarly journals Development of Polymer Based Nanocomposites as a Marker of Cadmium in Complex Matrices

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Abdullah M. Asiri ◽  
Kalsoom Akhtar ◽  
Jongchul Seo ◽  
Hadi M. Marwani ◽  
Dowan Kim ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Second Order ◽  
Emission Spectrometry ◽  
Order Kinetic ◽  
Inductively Coupled ◽  
Isotherm Study ◽  
Order Kinetic Model ◽  
Poly Propylene

Poly(propylene carbonate)/β-cyclodextrin (PPC-BCD) nanocomposites were developed as effective extractor for a specific extraction and separation of cadmium(II) by use of inductively coupled plasma-optical emission spectrometry. The selectivity of nanocomposites with different wt% of BCD (PPC-BCD 0.5, PPC-BCD 1, PPC-BCD 3, PPC-BCD 5, or PPC-BCD 10) was investigated toward Cd(II). Based on selectivity and pH studies, Cd(II) was the most quantitatively adsorbed on PPC-BCD 5 phase at pH 6, indicating that PPC-BCD 5 was the most selective toward Cd(II) among other nanocomposites. On the basis of adsorption isotherm study, the superior adsorption capacity of PPC-BCD 5 phase for Cd(II) was found to be 149.25 mg·g−1, following the Langmuir adsorption isotherm model. The kinetic of adsorption for Cd(II) has been examined by pseudo-first- and second-order models. The kinetic exploration suggested a pseudo-second-order kinetic model for the adsorption of Cd(II) on the PPC-BCD 5. Additionally, results of thermodynamic investigation demonstrated favorable spontaneous process for the adsorption mechanism of PPC-BCD 5 toward Cd(II).

scholarly journals Adsorption conceivable consequences of bio-sorbent got from cordia dichotoma (lasoda) and cassia occidentalis in the removal of methyl red dye

2021 ◽  
Vol 12 (2) ◽  
pp. 1311-1321
Author(s):  
Venkata Ramana K ◽  
Venkata Kishore C. H. ◽  
Chandra Mohan K. ◽  
Sailaja G. ◽  
Hari Babu B.
Keyword(s):  
Natural Waters ◽  
Industrial Effluent ◽  
Effect Of Temperature ◽  
Order Kinetic ◽  
Methyl Red ◽  
Cassia Occidentalis ◽  
First Order ◽  
Order Kinetic Model ◽  
Pseudo First Order ◽  
Red Dye

Sorption abilities of the sorbent material derived from Leaves and Barks of Lasoda (Cordia dichotoma) and Cassia Occidentalis were explored towards Methyl Red using synthetically prepared simulated wastewaters. Various factors such as initial dye concentration, contact time, adsorbent dosage, and the effect of temperature, which affects the adsorption, were evaluated. The equilibrium of adsorption was studied by Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich isotherms. To identify the kinetics of the adsorption process, pseudo-first-order, pseudo-second-order, Weber and Morris intraparticle diffusion, Bangham’s pore diffusion, and Elovich equations were applied. The interference of  fivefold excess of common anions and cations present in natural waters was studied. Cations like Ca2+, Mg2+, and Cu2+ have shown some interference but Fe2+ and Zn2+ have synergistically maintained the maximum extraction of the dye. The procedures developed have been successfully applied to some industrial effluent. The experimental data were suitable for the pseudo-First order kinetic model. The correlation coefficient (R2) and dimensionless separation factor (RL) values have confirmed that adsorption obeys Langmuir adsorption, indicating monolayer formation.

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