Removal of antimony (III) and antimony (V) from drinking water by ferric chloride coagulation: Competing ion effect and the mechanism analysis

Wu, Zhongke; He, Mengchang; Guo, Xuejun; Zhou, Ruijing

doi:10.1016/j.seppur.2010.10.006

Cited by 154 publications

(80 citation statements)

References 46 publications

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“…The reaction setup was pumped with a 40 g/L FeSO 4 ·H 2 O solution at a 10 L/h rate, whereas redox potential and pH were regulated by the addition of drops of H 2 O 2 (50% w/w) and NaOH (30% w/w), respectively. Particularly, in each synthesis, the pH was set at a constant value (4,7,9) and for this condition the redox potential was controlled to the corresponding maximum point, before oxygen bubbles appear, i.e., from +410 to +170 mV for the specific pH range. Formed solids were collected from the outflow of the system and thickened using an Imhoff tank.…”

Section: Adsorbentsmentioning

confidence: 99%

“…In summary, coagulation, adsorption, oxidation, ion-exchange, membrane separation and bioremediation techniques are commonly discussed in the respective literature studies [6,7]. Coagulation and co-precipitation methods usually incorporate the use of low-cost ferric or aluminum salts to successively capture both Sb(III) and Sb(V) species [8][9][10][11]. Relevant studies indicate that the removal of Sb(III) is more favorable than that of Sb(V), due to the increasing mobility of pentavalent species at pH values above 5 and the strong competition for adsorbing sites of specific co-existing anions, such as phosphate, silicate, and bicarbonate, commonly found in natural waters.…”

Section: Introductionmentioning

confidence: 99%

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Efficiency of Iron-Based Oxy-Hydroxides in Removing Antimony from Groundwater to Levels below the Drinking Water Regulation Limits

et al. 2017

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This study evaluates the efficiency of iron-based oxy-hydroxides to remove antimony from groundwater to meet the requirements of drinking water regulations. Results obtained by batch adsorption experiments indicated that the qualified iron oxy-hydroxide (FeOOH), synthesized at pH 4 for maintaining a high positive charge density (2.5 mmol OH − /g) achieved a residual concentration of Sb(III) below the EU drinking water regulation limit of 5 µg/L by providing an adsorption capacity of 3.1 mg/g. This is more than twice greater compared either to similar commercial FeOOHs (GFH, Bayoxide) or to tetravalent manganese feroxyhyte (Fe-MnOOH) adsorbents. In contrast, all tested adsorbents failed to achieve a residual concentration below 5 µg/L for Sb(V). The higher efficiency of the qualified FeOOH was confirmed by rapid small-scale column tests, since an adsorption capacity of 3 mg Sb(III)/g was determined at a breakthrough concentration of 5 µg/L. However, it completely failed to achieve Sb(V) concentrations below 5 µg/L even at the beginning of the column experiments. The results of leaching tests classified the spent qualified FeOOH to inert wastes. Considering the rapid kinetics of this process (i.e., 85% of total removal was performed within 10 min), the developed qualified adsorbent may be promoted as a prospective material for point-of-use Sb(III) removal from water in vulnerable communities, since the adsorbent's cost was estimated to be close to 30 ± 3.4 €/10 3 m 3 for every 10 µg Sb(III)/L removed.

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Section: Adsorbentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficiency of Iron-Based Oxy-Hydroxides in Removing Antimony from Groundwater to Levels below the Drinking Water Regulation Limits

et al. 2017

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“…Previous study has compared the behaviors between As and Sb during coagulation, and referred to the following order of the removal efficiency for As and Sb with Fe-based coagulants at neutral pH condition: As(V) > Sb(III) > As(III) > Sb(V) [7]. To remove Sb effectively, various technologies have been investigated, such as coagulation/flocculation [8], membrane separation [9], electrochemical methods [10], adsorption [11], etc. Most studies have found that adsorption is still the most promising method to remove antimony, after considering the cost and practical operation [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Synergistic process using Fe hydrolytic flocs and ultrafiltration membrane for enhanced antimony(V) removal

Wang

Liu

et al. 2017

Journal of Membrane Science

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A B S T R A C TAntimony (Sb) is harmful to human health, and Sb(V) is much more difficult to remove from water than other toxic elements such as arsenic (As). Theoretical studies have suggested that in situ flocs have stronger adsorption ability toward heavy metals than pre-made adsorbents. We believe that rational design of in situ flocs and the associated device structure will enable a floc-based device to be utilized in the removal of heavy metals. Based on this concept, we developed an integrated process taking advantage of the strong adsorption abilities of in-situ Al or Fe hydrolytic flocs and excellent separation properties of ultrafiltration (UF) membranes. We found that flocs could be well dispersed in a membrane tank with aeration from the bottom, and Fe-based flocs performed better in removing Sb(V) and alleviating membrane fouling than Al-based flocs. We also demonstrated that higher Sb (V) removal efficiency was induced with continuous injection, and lower solution pH. By controlling the aeration rate, injection frequency and the solution pH, membrane fouling was alleviated, especially under weakly acidic conditions. Additionally, owing to the higher rejection efficiency of the UF membrane, the effluent quality was improved, including the iron concentration, turbidity, and chromaticity. This innovative separation method shows promising potential for application in removing heavy metals in water treatment.

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“…Cadmium toxicity cause renal disturbances, lung problems, bone lesions, cancer and hypertension in humans [19][20][21] Thus, the removal of these toxic metals from wastewater is a crucial issue. processes like adsorption, coagulation, co-precipitation, ion-exchange and oxidation-reduction process have been reported in literature for treatment of arsenic and removal of heavy metals from wastewater [22][23][24][25][26][27][28][29]. Among these processes, absorption is one of the promising methods.…”

Section: Introductionmentioning

confidence: 99%

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Removal of antimony (III) and antimony (V) from drinking water by ferric chloride coagulation: Competing ion effect and the mechanism analysis

Cited by 154 publications

References 46 publications

Efficiency of Iron-Based Oxy-Hydroxides in Removing Antimony from Groundwater to Levels below the Drinking Water Regulation Limits

Efficiency of Iron-Based Oxy-Hydroxides in Removing Antimony from Groundwater to Levels below the Drinking Water Regulation Limits

Synergistic process using Fe hydrolytic flocs and ultrafiltration membrane for enhanced antimony(V) removal

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