Kinetic speciation of mercury–humate complexes in aqueous solutions by using competing ligand exchange method

Vudamala, Krushna; Chakraborty, Parthasarathi

doi:10.1016/j.microc.2016.01.012

Cited by 7 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thiol groups have a higher affinity to ions of Hg(II), Au(I) and Ag(I) than to the other heavy metal ions, such as Cd(II), Zn(II), Cu(II) or As(III). An example of the ion exchanger containing the thiol groups is Ambersep GT74 (Vudama and Chakraborty 2016). It is a weakly acidic cation exchanger with good selectivity for mercury, rhodium, cadmium, silver, lead and copper.…”

Section: Introductionmentioning

confidence: 99%

Chemical modification of commercial St-DVB microspheres and their application for metal ions removal

Podkościelna

Kołodyńska

2019

Adsorption

View full text Add to dashboard Cite

Multistage modification of commercially available styrene with divinylbenzene (St-DVB) microspheres is presented. The new type of modification introducing very attractive thiol (-SH) groups on the surface of polymeric matrices was made. In order to obtain thiol derivatives, the parent St-DVB microspheres were treated by H 2 SO 4 with addition of oleum and then conversion of sulfonic groups to chloride acylsulfonic groups in the presence of PCl 5 and POCl 3 was carried out. Finally, the reduction of modified microspheres by using SnCl 2 ·2H 2 O was conducted. The thiol groups content (elemental analysis), thermal properties (TG/DTG, DSC analysis) as well as the swelling characteristics of the functional microspheres were examined. The novel material St-DVB-SH was compared with commercial ion exchanger Ambersept GT74 to removal of heavy metal ions: Cu(II), Zn(II), Cd(II), Pb(II) and Ni(II). In order to investigate the applicability of the obtained microspheres for heavy metal ions removal, the batch method was used. On the basis of studies, the optimal pH of the solution and microspheres dose was determined. Both for St-DVB-SH and Ambersept GT74, the Langmuir and Freundlich isotherm models are used to represent adsorption equilibria. The pseudo first order, pseudo second order and intraparticle diffusion kinetic models were used to fit the adsorption kinetic data. Additionally, dynamic adsorption tests were carried out in order to establish bed exhaustion. Results of a comprehensive comparative analysis indicate that the new synthesized material St-DVB-SH is very effective for removal of heavy metal ions studied.

show abstract

Section: Introductionmentioning

confidence: 99%

Chemical modification of commercial St-DVB microspheres and their application for metal ions removal

Podkościelna

Kołodyńska

2019

Adsorption

View full text Add to dashboard Cite

show abstract

Sorptive and Redox Interactions of Humic Substances and Metal(loid)s in the Presence of Microorganisms

et al. 2021

View full text Add to dashboard Cite

An insight into mercury reduction process by humic substances in aqueous medium under dark condition

Vudamala

Chakraborty

Sailaja

2017

Environ Sci Pollut Res

View full text Add to dashboard Cite

Mercury (Hg) reduction by humic substances (HS) in the aquatic medium under the dark condition is a poorly understood but important process in Hg biogeochemical cycling. In this study, an effort was made to provide a better understanding of Hg(II) reduction by well-characterized humic substances under dark condition. Reduction of Hg(II) by dissolved HS in aquatic systems increases with increasing Hg loading. However, Hg(II) reduction gradually decreases with the increasing total S content and oxygen containing functional groups in the dissolved HS under dark condition. Increasing major cation concentration decreases the rate of Hg(II) reduction in aquatic systems. High concentration of Ca ion slows down the intermolecular electron transfer from HS to Hg(II) and inhibits the formation of Hg in absence of light. This study indicates that complexation of Hg(II) and HS is essential for Hg reduction under dark condition.

show abstract

Kinetic speciation of mercury–humate complexes in aqueous solutions by using competing ligand exchange method

Cited by 7 publications

References 32 publications

Chemical modification of commercial St-DVB microspheres and their application for metal ions removal

Chemical modification of commercial St-DVB microspheres and their application for metal ions removal

Sorptive and Redox Interactions of Humic Substances and Metal(loid)s in the Presence of Microorganisms

An insight into mercury reduction process by humic substances in aqueous medium under dark condition

Contact Info

Product

Resources

About