Removal of trace mercury(II) from drinking water: Sorption by granular activated carbon

Functionalized Carbon Nanotubes Encapsulated Alginate Beads for the Removal of Mercury Ions: Design, Synthesis, Density Functional Theory Calculation, and Demonstration in a Batch and Fixed-Bed Process

Various nanomaterials have been envisaged mainly through batch studies for environmental remediation application. The real utilization of these new generation adsorbents in large scale pose a difficulty due to its low density and small size which makes it difficult for isolation after application. In this context, nanoadsorbents polymer composite beads can be seen as a way out. Here, functionalized CNTs (carbon nanotubes) have been fabricated into micro beads with sodium alginate. The alginate-functionalized CNT (Alg-f-CNT) beads were then comprehensively evaluated for batch and fixed-bed column separation of divalent mercury ions from an aqueous medium. The effects of process parameters such as pH, contact time, feed Hg2+ concentration, and temperature were studied. Simulation of the experimental data suggested that adsorption is an endothermic spontaneous process which follows the pseudo-second-order kinetic and Langmuir isotherm model. The desorption of the Hg2+ ion from used adsorbent was possible with 1 M HNO3. The breakthrough curves at different process parameters were investigated during fixed-bed column separation and found to be in good agreement with Thomas model. The regeneration and reusability of the adsorbent were tested up to five cycles without a significant decrease in the removal performance. Density functional theory studies revealed stronger interaction of Alg-f-CNT with Hg compared to free alginic acid and established the role of carboxyl and oxo groups present in the adsorbent in the coordination of the Hg2+ ions. The experimental results demonstrate that functionalized CNT-encapsulated alginate beads are a promising alternate material, which can be used to remove mercury in the fixed-bed column mode of the operation.

Inorganic particulates in removal of heavy metal toxic ions—Part X: Rapid and efficient removal of Hg(II) ions from aqueous solutions by hydrous ferric and hydrous tungsten oxides

A radiotracer technique has been used to study the removal of Hg(II) ions from aqueous solutions by synthesized and well-characterized hydrous ferric oxide (HFO) and hydrous tungsten oxide (HTO). Adsorptive concentration (10(-4)-10(-8) mol dm(-3)), pH (ca 4.0-10.0) and temperatures (303-333 K) were examined for assessing optimal conditions for removal of these ions. The uptake of Hg(II) ions, fitted well with the Freundlich isotherm, increased with increasing temperature. No significant desorption took place in the present temperature range. The presence of other anions and cations affected the uptake of Hg(II) markedly. Irradiation of hydrous ferric oxide and tungsten oxide by using a 11.1 x 10(9)Bq (Ra-Be) neutron source having a neutron flux of 3.9 x 10(6)cm(-2)s(-1) with the associated gamma-dose rate of 1.72 Gy h(-1) did not influence the extent of adsorption of Hg(II) significantly.