Removal of Pb(II) from aqueous solution by a zeolite–nanoscale zero-valent iron composite

Kim, Seol Ah; Kamala‐Kannan, Seralathan; Lee, Kui Jae; Park, Yool Jin; Shea, Patrick J.; Lee, Wang Hyu; Kim, Hyung Moo; Oh, Byung Taek

doi:10.1016/j.cej.2012.11.097

Cited by 307 publications

(119 citation statements)

References 41 publications

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“…The proposed mechanisms agree with the detected XRD data as well as with the statements of previous studies [2,13,14,29]. Nevertheless, further investigations are necessary to confirm these statements.…”

Section: Reaction Mechanismssupporting

confidence: 81%

“…Manning et al [35] argued that γ-FeO(OH) acts as a substrate for the production and precipitation of metallic compounds. By considering the above reactions, it can be assumed that the pH increase monitored during the tests is attributable mainly to iron oxidation in water from Fe 0 to Fe 2+ and Fe 3+ , as stated also by Kim et al [13]. Indeed, the H + ions released in some reactions [14,28] can be neutralized by the OH − produced in other ones.…”

Section: Reaction Mechanismsmentioning

confidence: 92%

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Nanoscopic Zero-Valent Iron Supported on MgO for Lead Removal from Waters

Siciliano

Limonti

2018

Water

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Lead is one of the most toxic heavy metals that can create a severe risk to water ecosystem health. Zero-valent iron is an effective material for Pb 2+ removal treatments. In particular, nanoscopic zero-valent iron (nZVI) particles are characterized by high reaction rates; nevertheless, their utilization in water and groundwater remediation techniques requires further investigations. Indeed, it is necessary to define effective methods able to avoid the drawbacks due to the aggregation tendency of nanoparticles and their potential uncontrolled transport in groundwater. In this work, nZVI was supported on magnesium oxide grains (MgO_nZVI) to synthesize an alternative material for lead removal from aqueous solutions. Many experiments were conducted under several operating conditions in order to analyze the effectiveness of the produced material in Pb 2+ abatement. The performance of MgO_nZVI was also compared with those detected using commercial microscopic Fe 0 (mZVI) as a reactive material. The experimental findings showed a much greater reactivity of the supported nanoscopic iron particles. By means of a kinetic analysis of batch tests results, it was verified that, both for MgO_nZVI and mZVI, the lead abatement follows a pseudo-second-order kinetic law. The reaction rates were affected by the initial pH of the treatment solution and by the ratio between the Fe 0 amount and initial lead concentration. The efficiency of MgO_nZVI in a continuous test was steadily around 97.5% for about 1000 exchanged pore volumes (PV) of reactive material, while by using mZVI, the lead removal was approximately 88% for about 600 PV. X-ray diffraction (XRD) and energy-dispersive spectroscopy EDS analyses suggested the formation of typical iron corrosion products and the presence of metallic lead Pb 0 and Pb 2+ compounds on exhausted materials.

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Section: Reaction Mechanismssupporting

confidence: 81%

Section: Reaction Mechanismsmentioning

confidence: 92%

Nanoscopic Zero-Valent Iron Supported on MgO for Lead Removal from Waters

Siciliano

Limonti

2018

Water

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“…The methods of chemical precipitation, coagulation-flocculation, reverse osmosis, membrane filtration, and ion-exchange have been implemented and documented. (Lee et al 2012;Kim et al 2013;Googerdchian et al 2012). Although these technologies have been extensively paid much attention, the high cost, huge energy consumption, or the production of considerable toxic waste hamper their application (Mohan and Pittman 2006).…”

Section: Introductionmentioning

confidence: 99%

Effective Removal of Copper (II) and Cadmium (II) by Adsorbent Prepared from Chitosan-modified Magnetic Biochar

Song¹,

Yang²,

Cao³

2016

JRST

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A novel chitosan-modified magnetic biochar composite (CC-Fe) was synthesized by embedding Fe 2 O 3 and assembling chitosan in two-step. The properties of CC-Fe were characterized systematically by elemental analysis, Brunauer-Emmett-Teller (BET) surface area, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and batch sorption processes. The prepared adsorbent composite was comprised of magnetic particulates of Fe 2 O 3 and multifunctional group, and thus exhibited high sorption capability to remove copper (II) or cadmium (II) from waste water. For both copper (II) and cadmium (II), CC-Fe demonstrated a higher sorption capability (98% and 97%) than the non-chitosan magnetic biochar (11% and 7%). The sorption experimental results showed that the composite is a potential sorbent to remove copper (II) and cadmium (II). Due to its excellent magnetic characteristic, the heavy metal-laden CC-Fe could be isolated again from treated solution and reused after the desorption treatment. The functional groups of CC-Fe made efforts to the removal of heavy metals.

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“…Furthermore, other methods such as the use of clay materials (for example montmorillonite, kaolinite and zeolite) as composite materials to reduce aggregation of nZVI have also been proven to be useful for heavy metals adsorption. The composite materials have successfully eliminated aggregation and nZVI particles are well dispersed within the zeolite matrix (Kim et al, 2013). nZVI particles also showed less aggregation and better dispersion with the enhancement of montmorillonite (Bhowmick et al, 2014;Yuan et al, 2009).…”

Section: Introductionmentioning

confidence: 87%

“…The adsorption capability had increased by 1.75 mg g −1 . Increased in the adsorption capacity might be due to the larger specific area provided by the MC+nZVI (Kim et al, 2013;Zhang et al, 2011). Marine clay had acted as a media to prevent aggregation of zero valent iron thus providing more sites for adsorbing lead.…”

Section: Screening Of Materialsmentioning

confidence: 99%

Synthesis and Characterization of Marine Clay-Supported Nano Zero Valent Iron

How¹,

Yaacob²

2015

American Journal of Environmental Sciences

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This study reports the preparation and characterization of marine clay nano zero valent iron (MC+nZVI) where marine clay acts as the composite material. Marine clay was air dried and pulverized before used. Basically, MC+nZVI was synthesized by chemical reduction method. The materials synthesized were left oven dried overnight at 50°C. The obtained materials were characterized by Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR). FESEM images show that the nZVI particles dispersed well on the surface of marine clay thus reducing aggregation of nZVI. TEM images show that the particles have the shell-core structure and the particles sizes were around 29.92-57.11 nm for MC+nZVI. XPS spectrums indicate the existence of Fe 0 on the synthesized MC+nZVI. Other than that, XRD and FTIR results also show that there exists the formation of iron oxides on the surface of MC+nZVI. The adsorption capability of MC+nZVI is increased by 15% compared to marine clay. Therefore, increment of MC+nZVI adsorption capacity might be due to the welldispersed nZVI thus enhancing the performance of MC+nZVI.

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Removal of Pb(II) from aqueous solution by a zeolite–nanoscale zero-valent iron composite

Cited by 307 publications

References 41 publications

Nanoscopic Zero-Valent Iron Supported on MgO for Lead Removal from Waters

Nanoscopic Zero-Valent Iron Supported on MgO for Lead Removal from Waters

Effective Removal of Copper (II) and Cadmium (II) by Adsorbent Prepared from Chitosan-modified Magnetic Biochar

Synthesis and Characterization of Marine Clay-Supported Nano Zero Valent Iron

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