Mitigating arsenic crisis in the developing world: Role of robust, reusable and selective hybrid anion exchanger (HAIX)

German, Michael; Hul, Seingheng; SenGupta, Arup K.

doi:10.1016/j.scitotenv.2013.10.092

Cited by 45 publications

(25 citation statements)

References 29 publications

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“…Purolite C‐145; C‐100) as supports for HFO nanoparticles in As(V) removal. In addition, minimal backwashing requirements and low HFO fines formation were demonstrated; moreover, the hybrid sorbent is regeneratable in comparison with standard granular iron oxides . From this success, different materials using ion exchange resins have been commercialized by ion‐exchange producers, as is the case of Lanxess with the FO36 hybrid sorbent for the removal of As(V) from drinking water.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, minimal backwashing requirements and low HFO fines formation were demonstrated; moreover, the hybrid sorbent is regeneratable in comparison with standard granular iron oxides. 30,31 From this success, different materials using ion exchange resins 32,33 have been commercialized by ion-exchange producers, as is the case of Lanxess with the FO36 hybrid sorbent for the removal of As(V) from drinking water. Lewatit FO36 can also be used for removal of HPO 4 2− , HSbO 4 2− , SCN − due to its very high selectivity for sorption of oxyanions by the Donnan membrane effect.…”

Section: Introductionmentioning

confidence: 99%

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Phosphate removal from aqueous solution using a hybrid impregnated polymeric sorbent containing hydrated ferric oxide (HFO)

You

Guaya

Farrán

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND: This study evaluated a polymeric ion exchanger impregnated with nanoparticles of hydrated ferric oxide as a selective sorbent for anionic P(V) species. The hybrid impregnated anion exchanger (HAIX) employed as sorbent combines the durability and mechanical strength of a polymeric weak base anion exchange resin with the high sorption affinity of hydrated ferric oxide towards P(V) species.; RESULTS: The P(V) loading capacity of the sorbent at a pH simulating the expected conditions in treated wastewaters was 92+/-3mg P-PO4 g(-1) in single component solutions. The sorption of P(V) is affected slightly by the common ions typically present in these effluents such as Cl-, SO42- and NO3-, and a reduction of only 5% was observed (89+/-2 mg P-PO4 g(-1)) in multicomponent solutions. The sorbent can be regenerated (95+/-3%) using 4% (w/w) sodium hydroxide solution.; CONCLUSIONS: HAIX displays high selectivity for phosphate and small affinity for SO42-, NO3- and Cl- ions, which provides excellent conditions for its application at pH values typical of secondary wastewater effluents. HAIX exhibits higher and competitive phosphate removal capacity compared with data reported in the literature for materials based on HFO and for adsorbents prepared by impregnation of HFO onto polymeric supports. (C) 2015 Society of Chemical IndustryPeer ReviewedPostprint (author's final draft

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phosphate removal from aqueous solution using a hybrid impregnated polymeric sorbent containing hydrated ferric oxide (HFO)

You

Guaya

Farrán

et al. 2015

J of Chemical Tech & Biotech

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“…Hydrated ferric oxides (HFOs) have high affinity for both As(III) and As(V) because of the functional surface groups, FeOH2 + and FeOH (German et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of As(V) and Cr(VI) from water by macroporous anion exchanger supported nanoscale hydrous ferric oxide composite

et al. 2017

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As(V) and Cr(VI) are both highly toxic anionic pollutants and commonly co-exist in some industrial effluents and contaminated waters. In this study, simultaneous removal of them was efficiently achieved by employing a composite adsorbent (HFO-201) fabricated by immobilizing nanoscale hydrous ferric oxide (HFO) within a macroporous anion exchanger D201. The HFO-201 composite possesses two types of adsorption sites, i.e. the quaternary ammonium groups fixed on the D201 matrix and the embedded HFO nanoparticles. In the binary solution, the adsorption kinetic processes of both As(V) and Cr(VI) by HFO-201 were well fitted with the pseudo-first order kinetic model. Furthermore, HFO-201 exhibited a significantly higher adsorption capacity toward As(V) than D201 and an identical adsorption capacity toward Cr(VI) to D201. During the removal process, As(V) was captured by both the electrostatic attraction from the fixed quaternary ammonium groups and the formation of inner-sphere complex with the embedded HFO nanoparticles. Whereas, Cr(VI) was primarily adsorbed by the fixed ammonium groups. Fixed-bed treatment of As(V)/Cr(VI) binary synthetic water by HFO-201 resulted in elimination of As (from 1.0 to below 0.01 mg/L) and Cr (from 5.0 to below 0.05 mg/L), with the treatment capacity of 1700 bed volume (BV). Moreover, the exhausted HFO-201 was amenable to efficient in situ regeneration with a binary NaOH-NaCl solution for repeated use without any significant capacity loss.

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“…Driven by the prospects that introduction of nanoparticles in commercially available media could enable simple water treatment without requiring expensive infrastructure changes, significant research has been done to assess the benefits of adding novel nanoenabled properties to traditional adsorbent and ion-exchange media (Qu et al, 2013b;German et al, 2014). For example, granular activated carbon (GAC), which has been proven to be a poor sorbent for treating inorganic contaminants, demonstrated effective removal of arsenic and similar oxyanions after impregnation with metal (hydr)oxide nanoparticles (Zhang et al, 2007;Jang et al, 2008;Hristovski et al, 2009;Cooper et al, 2010;Sandoval et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

The effect of metal (hydr)oxide nano-enabling on intraparticle mass transport of organic contaminants in hybrid granular activated carbon

Garcı́a

Markovski

Gifford

et al. 2017

Science of The Total Environment

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The overarching goal of this study was to ascertain the changes in intraparticle mass transport rates for organic contaminants resulting from nano-enabled hybridization of commercially available granular activated carbon (GAC). Three different nano-enabled hybrid media were fabricated by in-situ synthesizing titanium dioxide nanoparticles inside the pores of GAC sorbent, characterized, and evaluated for removal of two model organic contaminants under realistic conditions to obtain the intraparticle mass transport (pore and surface diffusion) coefficients. The results validated the two hypotheses that: (H1) the pore diffusion rates of organic contaminants linearly decrease with decrease in cumulative pore volume caused by increase in metal (hydr)oxide nanoparticle content inside the pores of the hybrid GAC sorbent; and (H2) introduction of metal (hydr)oxide nanoparticles initially increases surface diffusivity, but additional loading causes its decrease as the increase in metal (hydr)oxide nanoparticles content continues to reduce the porosity of the GAC sorbent. Nano-enabled hybridization of commercially available GAC with metal (hydr)oxides has the potential to significantly increase the intraparticle mass transport limitations for organic contaminants. Introduction of metal (hydr)oxide nanoparticles inside the pores of a pristine sorbent causes the pore diffusion rates of organic contaminants to decrease as the cumulative pore volume is reduced. In contrast, the introduction of limited amounts of metal (hydr)oxide nanoparticles appears to facilitate the surface diffusion rates of these contaminants.

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Mitigating arsenic crisis in the developing world: Role of robust, reusable and selective hybrid anion exchanger (HAIX)

Cited by 45 publications

References 29 publications

Phosphate removal from aqueous solution using a hybrid impregnated polymeric sorbent containing hydrated ferric oxide (HFO)

Phosphate removal from aqueous solution using a hybrid impregnated polymeric sorbent containing hydrated ferric oxide (HFO)

Simultaneous removal of As(V) and Cr(VI) from water by macroporous anion exchanger supported nanoscale hydrous ferric oxide composite

The effect of metal (hydr)oxide nano-enabling on intraparticle mass transport of organic contaminants in hybrid granular activated carbon

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