Modeling a novel ion exchange process for arsenic and nitrate removal

Kim, Jaeshin; Benjamin, Mark M.

doi:10.1016/j.watres.2004.01.012

Cited by 296 publications

(116 citation statements)

References 6 publications

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“…Under these circumstances, various approaches have been established for As removal, such as coprecipitation, 8 membrane filtration, 9 photocatalysis, 10 and ion exchange. 11 Among them, adsorption is deemed to be a promising method to remove As from water due to its simplicity, cost effectiveness and lack of toxicity. To date, many adsorbents have been developed for the simultaneous removal of As(III) and As(V).…”

Section: ■ Introductionmentioning

confidence: 99%

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Luo

et al. 2016

ACS Appl. Mater. Interfaces

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To use zirconia (ZrO 2 ) as an efficient environmental adsorbent, it can be impregnated on a support to improve its physical properties and lower the overall cost. In this study, ZrO 2 embedded in carbon nanowires (ZCNs) is fabricated via an electrospinning method to remove arsenic (As) from water. The maximum adsorption capacity values of As(III) and As(V) on the ZCNs are 28.61 and 106.57 mg/g, respectively, at 40°C. These capacities are considerably higher than those of pure ZrO 2 (2.56 and 3.65 mg/g for As(III) and As(V), respectively) created using the same procedure as for the ZCNs. Meanwhile, the adsorption behaviors of As(III) and As(V) on the ZCNs are endothermic and pH dependent and follow the Freundlich isotherm model and pseudo-first-order kinetic model. Both As(III) and As(V) are chemisorbed onto the ZCNs, which is confirmed by a partial density of state (PDOS) analysis and Dubinin−Radushkevich (D-R) model calculations. Furthermore, the ZCNs also possess the capability to enhance or catalyze the oxidation process of As(III) to As(V) using dissolved oxygen. This result is confirmed by a batch experiment, XPS analysis and Mulliken net charge analysis. Density functional theory (DFT) calculations indicate the different configurations of As(III) and As(V) complexes on the tetragonal ZrO 2 (t-ZrO 2 )(111) and monoclinic ZrO 2 (m-ZrO 2 )(111) planes, respectively. The adsorption energy (E ad ) of As(V) is higher than that of As(III) on both the tZrO 2 (111) and m-ZrO 2 (111) planes (3.38 and 1.90 eV, respectively, for As(V) and 0.37 and 0.12 eV, respectively, for As(III)).

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Section: ■ Introductionmentioning

confidence: 99%

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Luo

et al. 2016

ACS Appl. Mater. Interfaces

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“…The treatment techniques include methodologies such as oxidation, precipitation and co-precipitation 12,13 , inverse osmosis 14 , and ion exchange 15 . These techniques employ solid adsorbents particles for immobilizing the As ions such as alumina, mineral oxides, active carbon, polymer resins and zeolites 16 .…”

Section: Introductionmentioning

confidence: 99%

Study of the Adsorption of Arsenic (III and V) by Magnetite Nanoparticles Synthetized via AACVD

et al. 2016

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Globally, water pollution is mainly caused by the presence of heavy metals and metalloids such as arsenic. The majority of the techniques employed in the removal are of low efficiency and high cost. Therefore, in this work it is presented the adsorption processes of arsenic (As III and V) ions employing magnetite nanoparticles (MNPs) synthesized by the aerosol assisted chemical vapor deposition (AACVD) process. The adsorption efficiency was determined at different times and concentrations. The remaining As concentration in the solutions was analyzed by atomic absorption spectroscopy. The adsorbed As ions on the surface of the NMPs was analyzed by high resolution transmission electron microscopy. The results showed an overall removal efficiency of 87% for As +3 and 98% for As +5, in a contact time of 15 minutes. Results suggested the use of NMPs as a promising alternative in the removal of As ions in water.

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“…Inorganic arsenic in water primarily exists in two oxidation states, neutral arsenite [As(III)] and negatively charged arsenate [As(V)]. Many technologies have been tested and applied for arsenic removal, including oxidation/precipitation (Borho and Wilderer, 1996;Leupin and Hug, 2005), coagulation/coprecipitation (Cheng et al, 1994;Hering et al, 1997;Wickramasinghe et al, 2004), adsorption (Guo et al, 2007;Maiti et al, 2012), ion exchange (Kim and Benjamin, 2004;Baciocchi et al, 2005), reverse osmosis (Kang et al, 2000;Ning, 2002), electrodialysis (Weng et al, 2005), and bioremediation (Katsoyiannis et al, 2002). Among them, adsorption is one of the most widely used technologies due to its easy operation and maintenance, high efficiency, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Reusability of Al-F Hydroxide Precipitates Generated in Adsorption and Coagulation Treatment of Fluoride for Adsorptive Removal of Arsenic

Liu

et al. 2015

Environmental Engineering Science

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This study aims to investigate the feasibility of utilizing Al-F hydroxide precipitates generated in Al hydroxide [Al(OH) 3 ] adsorption [Al(OH) 3 -F ads ] and aluminum (Al) coagulation [Al(OH) 3 -F coag ] for adsorptive removal of As(III) and As(V). Al(OH) 3 -F ads , Al(OH) 3 -F coag , and pristine Al(OH) 3 were characterized by nitrogen sorption, X-ray photoelectron spectroscopy, and fourier transform infrared spectroscopy (FTIR) before and after arsenic adsorption. The kinetic study indicated that As(III) and As(V) adsorption on these Al-based solid wastes followed the pseudo-second-order model. The calculated adsorption capacity of Al(OH) 3 -F ads and Al(OH) 3 -F coag for As(III) was 48.0 and 31.0 mg/g, while it was 84.0 and 56.3 mg/g for As(V), respectively. These adsorption capacities were 25-50% lower compared with pristine Al(OH) 3 . Anion exchange of fluoride by H 2 AsO 4 -and HAsO 4 2 -dominated in As(V) removal by Al(OH) 3 -F ads, while formation of an As-O complex played a more important role in As(V) removal by Al(OH) 3 -F coag . The maximum concentration of released fluoride after the adsorption of As(III) and As(V) by Al(OH) 3 -F ads and Al(OH) 3 -F coag was below the Chinese Class-II industrial discharge standard for fluoride (<20 mg/L). Results from this study indicated that the aluminum hydroxides generated in the fluoride removal process could be reclaimed as an adsorbent for As(III)/As(V) removal from industrial wastewater.

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Modeling a novel ion exchange process for arsenic and nitrate removal

Cited by 296 publications

References 6 publications

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Study of the Adsorption of Arsenic (III and V) by Magnetite Nanoparticles Synthetized via AACVD

Reusability of Al-F Hydroxide Precipitates Generated in Adsorption and Coagulation Treatment of Fluoride for Adsorptive Removal of Arsenic

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Modeling a novel ion exchange process for arsenic and nitrate removal

Cited by 296 publications

References 6 publications

Zirconia (ZrO2) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Zirconia (ZrO2) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Study of the Adsorption of Arsenic (III and V) by Magnetite Nanoparticles Synthetized via AACVD

Reusability of Al-F Hydroxide Precipitates Generated in Adsorption and Coagulation Treatment of Fluoride for Adsorptive Removal of Arsenic

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Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies

Zirconia (ZrO₂) Embedded in Carbon Nanowires via Electrospinning for Efficient Arsenic Removal from Water Combined with DFT Studies