A5085403677- Membrane-based Ion Separation Techniques
- Arsenic contamination and mitigation
- Adsorption and biosorption for pollutant removal
- Membrane Separation Technologies
- Phosphorus and nutrient management
- Chemical Synthesis and Characterization
- Heavy Metal Exposure and Toxicity
- Environmental remediation with nanomaterials
- Extraction and Separation Processes
- Fluoride Effects and Removal
- Water Quality Monitoring and Analysis
- Analytical Chemistry and Sensors
- Radioactive element chemistry and processing
- Electrochemical Analysis and Applications
- Heavy metals in environment
- Wastewater Treatment and Nitrogen Removal
- Water Treatment and Disinfection
- Mine drainage and remediation techniques
- Chromium effects and bioremediation
- Analytical chemistry methods development
- Chemical Analysis and Environmental Impact
- Solar-Powered Water Purification Methods
- Iron oxide chemistry and applications
- Nanoparticles: synthesis and applications
- Fuel Cells and Related Materials
Lehigh University
2014-2024
ORCID
2021
United States Bureau of Reclamation
2019
Indian Institute of Technology Madras
2019
Natural History Museum
2010
Imperial College London
2010
Lafayette College
2009
Polytechnic University of Bari
2003
The conditions leading to the Donnan membrane equilibrium arise from inability of ions diffuse out one phase in a heterogeneous system. In polymeric cation exchanger, negatively charged sulfonic acid groups are covalently attached polymer chains, and thus, they cannot permeate phase. Conversely, anion exchanger contains high concentration non-diffusible positively quaternary ammonium functional groups. It is well-established that submicron or nanoscale hydrated iron(III) oxide (HFO)...
The Donnan membrane principle can permit many engineered processes and materials to achieve better sustainability.
Of all the naturally occurring groundwater contaminants, arsenic is by far most toxic. Any large-scale treatment strategy to remove from must take into consideration safe containment of removed with no adverse ecological impact. Currently, 175 well-head community-based removal units are in operation remote villages Indian subcontinent. Approximately 150,000 villagers collect arsenic-safe potable water everyday these units. The continued has amply demonstrated that use regenerable...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal(II) ion binding onto chelating exchangers with nitrogen donor atoms: some new observations and related implicationsArup K. Sengupta, Yuewei Zhu, Diane HauzeCite this: Environ. Sci. Technol. 1991, 25, 3, 481–488Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 March 1991https://doi.org/10.1021/es00015a016RIGHTS & PERMISSIONSArticle Views531Altmetric-Citations103LEARN ABOUT THESE...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImportant process variables in chromate ion exchangeArup K. Sengupta and Dennis. CliffordCite this: Environ. Sci. Technol. 1986, 20, 2, 149–155Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissue 1 February 1986https://pubs.acs.org/doi/10.1021/es00144a006https://doi.org/10.1021/es00144a006research-articleACS PublicationsRequest reuse permissionsArticle Views503Altmetric-Citations85LEARN ABOUT...
This review presents some major developments and progress in using ion exchange selective separation for decontamination, desalination, decarbonization.
Abstract Separation processes using ion exchange materials are ubiquitous regarding the selective removal of contaminants environmental concern. Recently, highly regulated contaminants, such as arsenic, have gained notoriety on account carcinogenic effects and subsequent promulgation new drinking water standards by United States Environmental Protection Agency. Other nonregulated compounds hardness (e.g., Ca 2+ , Mg ), pose a particular concern to avoid scaling in heat‐transfer equipment,...
Commercial anion exchangers are unable to selectively remove dissolved chromate or CrO42- at neutral alkaline pH in the presence of other competing anions, namely, sulfate, chloride, bicarbonate, and nitrate. This study reports results a new exchanger, referred as polymeric ligand exchanger PLE, which shows very high affinity under otherwise identical conditions. Laboratory indicate that PLE is also amenable efficient regeneration chemically stable sorbed species.
The need for selective sorption of trace concentrations toxic Se(IV) and As(V) oxyanions, especially in the presence competing high sulfate ions, is well recognized. In this regard, previous investigators have shown advantages as shortcomings fixed‐bed process when activated alumina or strong‐base polymeric anion exchangers are used sorbents. present study reports behaviors a newly identified sorbent that, terms composition, specialty chelating polymer with immobilized Cu(II) at sites....
Fouling of membrane surfaces by particulate matter and large organic molecules is relatively common for pressure-driven processes, namely, reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF). Donnan process (DMP) or Dialysis driven electrochemical potential gradient across a semipermeable ion exchange membrane. Theoretically, DMP not susceptible to fouling fine particulates and/or molecules. According information available in the open literature, however, has been tried treat...
Many environmentally significant synthetic aromatic compounds such as pentachlorophenol, benzene and naphthalene sulfonates, carboxylates exist anions in water over a wide range of pH values. Understandably, both ionic charges nonpolar moieties these organic govern their sorption characteristics. This study reports the results very favorable behaviors anthropogenic onto polymeric anion exchangers. Such equilibria are, however, distinctively unique because they are all endothermic processes...
Metal oxide particlesnamely, oxides of Fe(III), Zr(IV), Ti(IV), and Al(III)are environmentally benign exhibit amphoteric sorption behaviors around neutral pH; i.e., they can selectively bind both transition-metal cations (e.g., Cu2+) anionic ligands arsenate or HAsO42-). Because sites reside predominantly on the surface, metal offer very high capacity at nanoscale sizes a mass basis, because surface area-to-volume ratio. However, these nanoparticles are almost impermeable in fixed-bed...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChromate ion exchange mechanism for cooling waterArup K. Sengupta and Dennis CliffordCite this: Ind. Eng. Chem. Fundamen. 1986, 25, 2, 249–258Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 1986https://pubs.acs.org/doi/10.1021/i100022a012https://doi.org/10.1021/i100022a012research-articleACS PublicationsRequest reuse permissionsArticle Views253Altmetric-Citations54LEARN ABOUT THESE...