Impact of natural organic matter on arsenic removal by modified granular natural siderite: Evidence of ternary complex formation by HPSEC-UV-ICP-MS

Fu-lan, LI; Guo, Huaming; Zhou, Xiaojin; Zhao, Kai; Shen, Jiaxing; Liu, Fei; Wei, Chao

doi:10.1016/j.chemosphere.2016.10.135

Cited by 46 publications

(16 citation statements)

References 45 publications

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“…52 This journal is © The reached equilibrium in 3 days, and the estimated maximum adsorption capacity was only 1.04 and 0.52 mg g À1 for As(III) and As(V), respectively. 62 However, As(III) adsorption on the synthetic siderite is fast and the adsorption equilibrium can be reached in 20 min. 63 As the percentage of oxidized As(III) increased, the siderite was converted to lepidocrocite and goethite.…”

Section: Iron Oxy-hydroxidesmentioning

confidence: 99%

A critical review on arsenic removal from water using iron-based adsorbents

et al. 2018

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Section: Iron Oxy-hydroxidesmentioning

confidence: 99%

A critical review on arsenic removal from water using iron-based adsorbents

et al. 2018

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“…This can be explained by the fact that the surface water contains concentrations of competing substances, such as phosphate and organic matter. Phosphate is a well-established competitor for arsenic removal, whereas organic matter is not expected to have had a major effect on arsenic removal, as some previous studies have presented [45,46], which demonstrated that As(V) removal by iron oxides was affected by humic acids only when the latter were above 10 and 40 mg/L respectively. Furthermore, NOM concentration in groundwaters is usually low and therefore is usually not a limiting factor for efficient As(V) removal.…”

Section: As(v) and Cr(vi) Removal By Fe(ii) In Different Water Matricesmentioning

confidence: 99%

Simultaneous Removal of Arsenate and Chromate from Ground- and Surface- Waters by Iron-Based Redox Assisted Coagulation

et al. 2020

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Arsenic (As) and chromate (Cr(VI)) contamination of ground and surface waters is a major problem worldwide. Given that a new drinking water limit is anticipated for Cr(VI) and that the limit of arsenic in drinking water is quite low (10 μg/L), there is an urgent need for evaluating technologies that could be efficient for removal of both contaminants simultaneously. In this work, the use of Fe(II) redox assisted coagulation was investigated to simultaneously remove the contaminants of interest. The basic principle of this technology is that Fe(II) could react with Cr(VI) and form Fe(III)-hydroxides and insoluble Cr(III) species, while the freshly formed Fe(III) hydroxides are very efficient adsorbents for As(V). The effect of pH, the water matrix composition, Fe(II) dose, initial contaminant concentrations, NOM presence and phosphate concentration were the examined parameters. The results revealed that with a dose of 2 mg/L Fe(II), residual As(V) and Cr(VI) concentrations were both below 10 μg/L, from initial concentrations of 50 μg/L. Though, this is effective only at circumneutral pH values. This is however not a big obstacle, since most natural waters, especially groundwaters, have near neutral pH values. At these pH values, residual iron concentration was far below 200 μg/L. The presence of phosphate anions inhibited As(V) removal but had no effect on Cr(VI) removal. Increasing Fe(II) concentrations eliminated the effect of phosphate and provided simultaneous phosphate removal. Therefore, Fe(II) coagulation can be applied, with secured results, for simultaneous As(V), Cr(VI) and phosphate removal from waters.

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“…Wood-based charcoal was efficient in the removal of As from arsenic-contaminated water (Hussain et al, 2001), however, a definitive mechanism was not provided for the removal of As. Alternatively, adsorbed NOM can significantly inhibit As(V) adsorption via competitive sorption processes (Ghosh et al, 2006, Li et al, 2017, suggesting that NOM oxidation could improve availability of sorption sites.…”

Section: 34mentioning

confidence: 99%

Enhanced adsorption of arsenic through the oxidative treatment of reduced aquifer solids

Huling

Ludwig

2017

Water Research

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Arsenic (As) contamination in drinking water is an epidemic in many areas of the world, especially Eastern Asian countries. Developing affordable and efficient procedures to remove arsenic from drinking water is critical to protect human health. In this study, the oxidation of aquifer solids through the use of sodium permanganate (NaMnO), hydrogen peroxide (HO), and exposure to air, enhanced the adsorption of arsenic to the aquifer material resulting in treatment of the water. NaMnO was more effective than HO. NaMnO was tested at different loading rates (0.5, 1.5, 2.4, 3.4, and 4.9 g NaMnO/kg aquifer material), and after 30 days contact time, arsenic removal ([As] = 610 μg/L) was 77%, 88%, 93%, 95%, 97%, respectively, relative to un-oxidized aquifer material. Arsenic removal increased with increasing contact time (30, 60, 90 days) suggesting removal was not reversible under the conditions of these experiments. Oxidative treatment by exposing the aquifer solids to air for 68 days resulted in >99% removal of Arsenic ([As] = 550 μg/L). Less arsenic removal (38.2%) was measured in the un-oxidized aquifer material. In-situ oxidation of aquifer materials using NaMnO, or ex-situ oxidation of aquifer materials through exposure to air could be effective in the removal of arsenic in ground water and a potential treatment method to protect human health.

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Impact of natural organic matter on arsenic removal by modified granular natural siderite: Evidence of ternary complex formation by HPSEC-UV-ICP-MS

Cited by 46 publications

References 45 publications

A critical review on arsenic removal from water using iron-based adsorbents

A critical review on arsenic removal from water using iron-based adsorbents

Simultaneous Removal of Arsenate and Chromate from Ground- and Surface- Waters by Iron-Based Redox Assisted Coagulation

Enhanced adsorption of arsenic through the oxidative treatment of reduced aquifer solids

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