Functionalized Nanoparticles as Sorbents for Removal of Toxic Species

Removal of various toxic species from aqueous streams is of great importance. Sorption is one of the important remediation procedures as it involves the use of cheap and easily available materials. Also the advantage of regeneration of the sorbent involves the possibility of using novel sorbents. Nanosorbents are very important as the removal is based on the surface phenomena and this is greatly affected by surface charge and area. Functionalization has been very important to bring about the removal of metal ions with greater selectivity

Functionalized Nanoparticles as Sorbents for Removal of Toxic Species

Removal of various toxic species from aqueous streams is of great importance. Sorption is one of the important remediation procedures as it involves the use of cheap and easily available materials. Also the advantage of regeneration of the sorbent involves the possibility of using novel sorbents. Nanosorbents are very important as the removal is based on the surface phenomena and this is greatly affected by surface charge and area. Functionalization has been very important to bring about the removal of metal ions with greater selectivity

Uranyl - PyridylAzo Resorcinol System: Uncertainty Budget Evaluation and Interference Elimination

The spectrophotometric determination of uranyl ion with 4-(2-Pyridylazo)resorcinol (PAR) is a well known and old method. However this technique gives scope for further research in order to make it more selective as well as sensitive for uranyl ion determination. In this study, the experimental protocol has simplified as compared to previous report. An attempt to evaluate the uncertainty budget associated with the determination has been carried out. The effect of different cationic interferences has been studied and a simple method was developed to reduce the interferences

Functionalized Nanoparticles as Sorbents for Removal of Toxic Species

Removal of various toxic species from aqueous streams is of great importance. Sorption is one of the important remediation procedures as it involves the use of cheap and easily available materials. Also the advantage of regeneration of the sorbent involves the possibility of using novel sorbents. Nanosorbents are very important as the removal is based on the surface phenomena and this is greatly affected by surface charge and area. Functionalization has been very important to bring about the removal of metal ions with greater selectivity

Functionalized Nanoparticles as Sorbents for Removal of Toxic Species

Removal of various toxic species from aqueous streams is of great importance. Sorption is one of the important remediation procedures as it involves the use of cheap and easily available materials. Also the advantage of regeneration of the sorbent involves the possibility of using novel sorbents. Nanosorbents are very important as the removal is based on the surface phenomena and this is greatly affected by surface charge and area. Functionalization has been very important to bring about the removal of metal ions with greater selectivity

Sorption of dyes and Cu(II) ions from wastewater by sonochemically synthesized MnWO<SUB>4</SUB> and MnMoO<SUB>4</SUB> nanostructures

MnWO4 and MnMoO4 nanoparticles have been synthesized using a facile sonochemical technique. The nanostructures were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen adsorption–desorption measurements. The as-prepared spherical MnWO4 and MnMoO4 nanostructures have a high specific surface area and their excellent adsorbent properties to remove organic pollutants have been demonstrated for the first time. Complete removal of dyes like Rhodamine B and Methylene blue was possible within 2–10 minutes. The influences including initial pH, dosage of adsorbent and contact time have been researched in order to find the optimum adsorption conditions. The experimental data were analyzed by the Langmuir and Freundlich adsorption models. MnWO4 also proved to be a good sorbent for Cu(II) ions. The kinetic modeling for Cu(II) sorption has been discussed. These studies showed that there is a possible application for the complete and fast removal of the organic dyes in the presence of inorganic cations using MnWO4/MnMoO4 sorbents. The thermal regeneration of the sorbents is possible and they show similar adsorption efficiency up to ten consecutive cycles. The sonochemically synthesized MnWO4 and MnMoO4 nanomaterials could serve as promising adsorbents for the removal of organic dyes, especially, cationic dye, and Cu(II) ions from polluted water

Exploration of sorption properties of sonochemically synthesized BaMoO<SUB>4</SUB> nanoparticles for hazardous cationic dye removal

We report the synthesis of barium molybdate (BaMoO4) nanoparticles via a simple sonochemical technique. The nanoparticles have been characterized using powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution TEM. The surface area of the nanoparticles has been determined using Brunauer-Emmett-Teller (BET) analysis. The as-prepared spherical BaMoO4 nanostructures demonstrate excellent adsorbent properties to remove harmful organic dyes like Rhodamine B (RhB), Malachite green (MG) and Methylene blue (MB). The effect of pH, concentration of dye and loading of sorbent on the process of adsorption has been evaluated. Kinetic study on the adsorption process has been discussed using Langmuir and Freundlich models. Regeneration of the sorbents is easily possible through simple thermal treatment and similar adsorption efficiency upto five consecutive cycles has been demonstrated. The dye adsorbed on BaMoO4 samples have also been tested for photocatalytic degradation. In principle, these BaMoO4 nanostructures with higher adsorption abilities could be very promising adsorbents for treatment of cationic dye effluent from various industries

Serendipitous discovery of super adsorbent properties of sonochemically synthesized nano BaWO<SUB>4</SUB>

The superior adsorbent properties of BaWO<SUB>4</SUB> nanostructures have been reported for the first time. Flower shaped aggregates (∼250 nm) of BaWO<SUB>4</SUB> nanoparticles, having an average size of ∼10–15 nm with a high surface area of ∼148.0 ± 0.2 m<SUP>2</SUP> g<SUP>−1</SUP>, have been synthesized sonochemically and used for the adsorption of various cationic dyes from aqueous solutions. The sonochemically synthesized BaWO<SUB>4</SUB> have been characterized by scanning electron microscopy (SEM), selected area electron diffraction (SAED), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR). The adsorbent capacity of this tungstate is much higher than that reported for other nanomaterials like Fe<SUB>2</SUB>O<SUB>3</SUB>, MnO<SUB>2</SUB>, WO<SUB>3</SUB>, etc. Complete removal of dyes like rhodamine B and methylene blue was possible within a short time span of 10–15 minutes. The adsorption process was followed using UV-Visible spectroscopy, while the material before and after adsorption has been characterized using physicochemical and spectroscopic techniques. Various isotherms have been used to fit the data, and kinetic parameters were evaluated. Moreover, the adsorbed dyes could be desorbed completely from nanoparticle surfaces by annealing at moderate temperature and were found to be efficient for multicyclic use. Thus this sonochemically synthesized nano BaWO<SUB>4</SUB> has great significance in treatment of dye industry effluents as a promising adsorbent for cationic dyes from aqueous solution