Studies on the optimum conditions using acid-washed zero-valent iron/aluminum mixtures in permeable reactive barriers for the removal of different heavy metal ions from wastewater

Han, Weijiang; Fu, Fenglian; Cheng, Zihang; Tang, Bing; Wu, Shijiao

doi:10.1016/j.jhazmat.2015.09.041

Cited by 139 publications

(47 citation statements)

References 62 publications

(77 reference statements)

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“…This phenomenon is described by different redox potential of copper (Cu +2 /Cu, 0.34), which is greater than that of cadmium (-0.40Cd +2 /Cd) and nickel (0.20Ni -2 /Ni). Hun et al observed similar results in their study (24).…”

Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencysupporting

confidence: 74%

“…They observed that increasing the pH caused the decrease of heavy metal removal to such an extent that the best results in their study were observed at pH 5.4 (23). However, the study of Han et al confirmed our results (24). Similar results were also observed in another study conducted by Ahn et al on the ability of the steel manufacturing by-products as permeable reactive materials for Arsenic removal in mine tailing containment systems and described that the increase of pH increased the heavy metal removal (25).…”

Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencysupporting

confidence: 64%

“…In the present study, the highest removal efficiency of the heavy metals including cadmium, nickel, and copper were obtained at pH 7 and this removal efficiency could be kept constant for longer period of time compared to the length of time at pH 3 and 5. This duration was much higher at pH 7 due to the fact that the hydroxide precipitation, in addition to the reduction and adsorption processes, also played a role in the removal of heavy metal ions at higher pH (24)…”

Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencymentioning

confidence: 99%

“…This duration was much higher at pH 7 due to the fact that the hydroxide precipitation, in addition to the reduction and adsorption processes, also played a role in the removal of heavy metal ions at higher pH (24). The reaction shown at Equation 1 was done at acidic pH (3) indicating no hydroxide precipitates, while the reduction and adsorption played main roles in the heavy metal removal at this pH; so decreasing the heavy metal removal was expected at pH 3.…”

Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencymentioning

confidence: 99%

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The Use of Acid-Washed Iron/Aluminum Mixture in Permeable Reactive Barrier for the Elimination of Different Heavy Metal Ions From Water

Samadi¹,

Asgari²,

Rahmani³

et al. 2017

Avicenna J Environ Health Eng

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In this experimental study, the performance of a fixed bed column containing a mixture of iron and aluminum modified with acid, as a reaction bed, was evaluated for the removal of heavy metals of cadmium, nickel, and copper. The tests were carried out by feeding the columns with aqueous solutions at the concentration of 100 mg/L using four iron/aluminum granular mixtures at various volume ratios (100/0, 50/50, 75/25, 25/75 and 0/100), and pH (3, 5, 7) for a total of 28 column tests. Results showed that metal ion removal was mainly accomplished via redox reactions that initiated the precipitation of mineral phases. At pH 5 and flow rate of 1 mL/min, the removal efficiency of cadmium, nickel, and copper at the 50/50 ratio of modified iron and aluminum was obtained higher than 99% and this removal efficiency could be kept about 50 hours. It seems that the column with the volume ratio of 75/25 of iron and aluminum mixture was the most efficient column for removing the heavy metals with the most suitable iron content and also high hydraulic performance due to the suitable aluminum content. It is therefore seen that the mixture of iron and aluminum can be used as an environmentally and economically viable remediation technology for the subsequent prevention of groundwater contamination.

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Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencysupporting

confidence: 74%

Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencysupporting

confidence: 64%

Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencymentioning

confidence: 99%

Section: Effect Of Inlet Ph On Heavy Metal Removal Efficiencymentioning

confidence: 99%

See 2 more Smart Citations

The Use of Acid-Washed Iron/Aluminum Mixture in Permeable Reactive Barrier for the Elimination of Different Heavy Metal Ions From Water

Samadi¹,

Asgari²,

Rahmani³

et al. 2017

Avicenna J Environ Health Eng

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“…The peaks at 710.98 eV and 724.50 eV correspond to the binding energy of Fe 2P3/2 and Fe 2P1/2 respectively in Fe2O3 according to the literatures [23]. As shown in Figure 1A, the spectra peaks at 712.20 eV correspond to the binding energy of Fe 2P3/2 in FeOOH [24][25][26][27]. In Figure 1B, the O 1s peak of binding energy at 530.20 eV represents the lattice oxygen in iron (III) oxide, and the peak at 531.50 eV represents the hydroxyl group linked with Fe(III) [28].…”

Section: Characterization Of Catalystsmentioning

confidence: 63%

Fe Oxides Loaded on Carbon Cloth by Hydrothermal Process as an Effective and Reusable Heterogenous Fenton Catalyst

2018

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Iron based heterogeneous Fenton catalysts are attracting much attention for its economic and environmental friendly characteristics. In this study, iron oxides loaded carbon cloth (assigned as Fe@CC) was prepared using hydrothermal hydrolysis of Fe(NO 3 ) 3 . The specific surface area of Fe@CC determined by N 2 adsorption-desorption Brunauer-Emmett-Teller method was up to 1325.5 m 2 /g, which increased by 81.8% compared with that of native carbon cloth mainly due to the loading of iron oxide. XPS (X-ray photoelectron spectroscopy) spectra confirmed that the iron oxide on the carbon surface included mainly FeOOH. Its heterogeneous Fenton-like activity was determined using Acid Red G as a model substrate for degradation. Fe@CC maintained high and relatively stable activity during 11 tests, and it showed high COD (Chemical Oxygen Demand) removal efficiency and high apparent H 2 O 2 utilization efficiency. The homogeneous Fenton reaction using the amount of leached Fe(III) suggested that the surficial reaction on Fe@CC was dominant. The stability and the mechanism for gradual decrease of activity during the first 4 tests were also discussed.

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Application of zeolitic imidazolate framework for hexavalent chromium removal: A feasibility and mechanism study

Sheu

Verpoort

et al. 2021

Water Environment Research

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The mechanisms and effectiveness of using zeolitic imidazolate framework (ZIF‐8) [a sub‐family of metal‐organic framework (MOF)] particles on hexavalent chromium [Cr(VI)] removal were evaluated. The ultrasonic mixing method was applied for the preparation of ZIF‐8, and chemicals used for ZIF‐8 synthesis included ammonium hydroxide, zinc nitrate hexahydrate, and 2‐methylimidazole. ZIF‐8 particle had a clear rhombic dodecahedron morphology shape and a strong peak intensity with high crystallinity. The adsorption capacity (AC) of ZIF‐8 was 30.3 mg of Cr(VI)/g of ZIF‐8 [Cr(VI) = 50 mg/L]. The AC of Cr(VI) raised to 34.3 mg/g under acidic conditions (pH = 5), and the AC dropped to below 13.7 mg/g with a pH range from 7 to 11. It could be because of the competitive effects between CrO42− and hydroxide ions for adsorption locations of ZIF‐8. Cr(VI) removal relied on the amount of Cr(VI) adsorbed on the particles of ZIF‐8, and the mechanisms of Cr(VI) adsorption by ZIF‐8 included chemical/physical processes and the rate‐limiting step was the chemical adsorption. A fraction of sorbed Cr(VI) was reduced to Cr(III), and thus, ZIF‐8 could serve as a reducing agent during Cr(VI) reduction. Cr(VI) was removed effectively from the water phase by ZIF‐8 via adsorption and reduction mechanisms. Practitioner Points ZIF‐8 particles had an adsorption capacity of 30.33 mg of Cr(VI)/g of ZIF‐8. Cr(VI) sorption by ZIF‐8 has chemical (rate‐limiting step) and physical processes. ZIF‐8 can serve as a reducing agent for Cr(VI) reduction. Cr(VI) can be removed by ZIF‐8 via the adsorption and reduction mechanisms.

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Studies on the optimum conditions using acid-washed zero-valent iron/aluminum mixtures in permeable reactive barriers for the removal of different heavy metal ions from wastewater

Cited by 139 publications

References 62 publications

The Use of Acid-Washed Iron/Aluminum Mixture in Permeable Reactive Barrier for the Elimination of Different Heavy Metal Ions From Water

The Use of Acid-Washed Iron/Aluminum Mixture in Permeable Reactive Barrier for the Elimination of Different Heavy Metal Ions From Water

Fe Oxides Loaded on Carbon Cloth by Hydrothermal Process as an Effective and Reusable Heterogenous Fenton Catalyst

Application of zeolitic imidazolate framework for hexavalent chromium removal: A feasibility and mechanism study

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