Mercury(II) Adsorption from Wastewaters Using a Thiol Functional Adsorbent

Abstract

The removal of mercury(II) from wastewaters (coal-fired utility plant scrubber solutions) using a thiol functional organoceramic composite (SOL-AD-IV) is investigated. A simulant is employed as a surrogate to demonstrate the removal of mercury from real waste solutions. Equilibrium studies show a mercury uptake capacity of 500 mg/g at a low mercury concentration of 0.5 mg/L and 726 mg/g at saturation. Adsorption is observed to be independent in the pH range 3-5. The kinetic performance assessed on a recycle batch reactor shows a rapid rate of adsorption. Selectivity is found to be in the order Hg(II) > Pb(II) ∼ Cd(II) > As(V) > Cr(III). Regeneration of SOL-AD-IV is accomplished using 12 M HCl. Effluent mercury concentrations of <0.001 mg/L are achieved using a fixed-bed adsorption column. A stability test operated for 25 cycles indicates a capacity loss of <10%. A high potential is demonstrated for application for mercury cleanup of wastewaters.

Cerium functionalized PVA–chitosan composite nanofibers for effective remediation of ultra-low concentrations of Hg(ii) in water

“…The U.S. environmental protection agency (U.S. EPA) has set a very low discharge limit of 10 mg L À1 for Hg in wastewater. 4 Various methods have been reported for the removal of Hg(II), including chemical precipitation, ion exchange, membrane ltration, electrochemical separation, reverse osmosis, solvent extraction and adsorption. [5][6][7] Adsorption is considered to be a suitable option because it is rapid and economical, in addition to its lack of sludge by-product.…”

In situ sensing of metal ion adsorption to a thiolated surface using surface plasmon resonance spectroscopy

“…The adsorption of heavy metal ions onto a thiol-functionalized surface is a meaningful reaction for reducing the level of environmental toxic heavy metal ions such as Hg 2+ [22][23][24], manufacturing metal-doped catalysts [25], and metal ion sensors [4]. In particular, it should be noted that the adsorption of Pt 2+ onto the thiolated surface may be applicable to the qualitative and quantitative analyses of aqueous Hg 2+ ions in that thiol compounds have a strong affinity to Hg 2+ and Pt 2+ .…”

Sequestration of Heavy Metals from Water with Layered Metal Sulfides

“…KMS-1 is more efficient as heavy metal ion scavenger than LiMoS 2 , [14] another example of a layered sulfide. KMS-1 is also stable in atmosphere and water, whereas LiMoS 2 [24,25] and thiol-functionalized sorbents [26] need to be Because KMS-1 is relatively inexpensive and can rapidly reduce the Hg 2 + , Pb 2 + , and Cd 2 + content of aqueous media well below the acceptable limits for water, it is promising for the detoxification of a variety of wastes and drinking water from heavy metal ions. The strong MÀS bonds (M = heavy metal ion) combined with facile ion diffusion and access of all internal surfaces of layered metal sulfides provides a powerful driving force for heavy metal remediation.…”