Journal ArticleDOI
Removing Selenium(IV) and Arsenic(V) Oxyanions with Tailored Chelating Polymers
Anuradha Ramana,Arup K. SenGupta +1 more
TLDR
In this article, a newly identified sorbent that, in terms of composition, is a specialty chelating polymer with immobilized Cu(II) present at the sorption sites is presented, which shows higher selenite and arsenate selectivities over competing sulfate ions.Abstract:
The need for selective sorption of trace concentrations of toxic Se(IV) and As(V) oxyanions, especially in the presence of competing high concentrations of sulfate ions, is well recognized. In this regard, previous investigators have shown the advantages as well as shortcomings of the fixed-bed sorption process when activated alumina or strong-base polymeric anion exchangers are used as sorbents. The present study reports the sorption behaviors of a newly identified sorbent that, in terms of composition, is a specialty chelating polymer with immobilized Cu(II) present at the sorption sites. Experimental results with the new sorbent show higher selenite and arsenate selectivities over competing sulfate ions. Anion exchange accompanied by Lewis acid-base interactions are the underlying reasons for the new sorbent’s enhanced affinities toward arsenates and selenites. In several ways, the new sorbent can complement the shortcomings of activated alumina and other strong-base anion exchangers.read more
Citations
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Journal ArticleDOI
Arsenic removal from water/wastewater using adsorbents—A critical review
Dinesh Mohan,Charles U. Pittman +1 more
TL;DR: Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates, and some commercial adsorbents which include resins, gels, silica, treated silica tested for arsenic removal come out to be superior.
Journal ArticleDOI
Arsenic removal using polymer-supported hydrated iron(III) oxide nanoparticles: role of donnan membrane effect.
Luis Cumbal,Arup K. SenGupta +1 more
TL;DR: The most significant finding of the study is that the anion exchanger as a substrate containing dispersed HFO offered substantially higher arsenate removal capacity as compared to the cation exchanger, all other conditions remaining identical.
Journal ArticleDOI
Arsenic removal using a polymeric/inorganic hybrid sorbent.
TL;DR: Repeated use of the same HIX particles during various laboratory investigations provided strong evidence that the new sorbent possesses excellent attrition resistance properties and retains its arsenic removal capacity over cycles.
Journal ArticleDOI
Adsorption of As(III) from aqueous solutions by iron oxide-coated sand
TL;DR: Iron oxide-coated sand is a suitable adsorbent for reducing As(III) concentration to the limit (50 microg/l) recommended by Indian Standards for Drinking Water.
Journal ArticleDOI
An overview of arsenic removal by pressure-drivenmembrane processes
TL;DR: In this article, an overview of geochemistry, distribution, sources, regulations, acute and chronic symptoms, and applications of membrane technologies in the water treatment research that have already been realized or that are suggested on the basis of bench or lab scale research.
References
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Book
Standard methods for the examination of water and wastewater
TL;DR: The most widely read reference in the water industry, Water Industry Reference as discussed by the authors, is a comprehensive reference tool for water analysis methods that covers all aspects of USEPA-approved water analysis.
Book
Lange's Handbook of Chemistry
TL;DR: This encyclopedic work includes authoritative coverage of atomic and molecular structure, organic chemistry (revised), inorganic, analytical, and electro- chemistry, mathematics as applied to chemistry, and more.
Journal ArticleDOI
In Situ X-ray Absorption Study of Surface Complexes: Selenium Oxyanions on α-FeOOH
Kim F. Hayes,A. Lawrence Roe,Gordon E. Brown,Kerrh O. Hodgson,James O. Leckie,George A. Parks +5 more
TL;DR: In this article, in situ extended x-ray absorption fine structure (EXAFS) measurements of adsorbed selenate and selenite ions at the α-FeOOH(goethite)-water interface have been performed; these measurements show that selenates forms a weakly bonded, outer-sphere complex and that Selenite forms a strongly bonded, inner-spheres complex.
Journal ArticleDOI
‘Ligand Exchange’ : a Novel Separation Technique
TL;DR: In this paper, a novel technique for analytical and preparative separations of compounds which can form complexes or adducts with metal ions has been worked out in this laboratory, which can appropriately be called "ligand exchange" and combines two fields of chemistry, namely, ion exchange and co-ordination chemistry.
Related Papers (5)
Arsenic removal using a polymeric/inorganic hybrid sorbent.
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Luis Cumbal,Arup K. SenGupta +1 more