Polyacrylonitrile/polypyrrole core/shell nanofiber mat for the removal of hexavalent chromium from aqueous solution

Wang, Jianqiang; Pan, Kai; He, Qinming; Cao, Bing

doi:10.1016/j.jhazmat.2012.11.020

Cited by 270 publications

(129 citation statements)

References 45 publications

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“…Those two forms are commonly dispersed in the environs as a result of different anthropogenic events [22,23] as well as geochemical mobilization [17]. The industrial processes from which Cr is released include electroplating, petroleum refining, leather tanning, wood preservation, photography, metal finishing, pulp processing, and dye and textile industries [9,24,25]. Cr can also naturally be elevated in soils derived from the weathering of Cr-bearing ultramafic rocks and serpentinites which cover approximately one percent of the global land surface [26].…”

Section: Chromium Pollutionmentioning

confidence: 99%

“…Due to several industrial and manufacturing activities, annually more than 170,000 t of Cr waste are released into the environment [40,25]. Therefore, several technologies to remove Cr (VI) from aqueous solutions have been developed [24]. The industrial waste and soil are treated by various physico-chemical methods: electrochemical reduction [44], electrocoagulation [45], precipitation, adsorption [46], ion exchange [47] and membrane separation [48].…”

Section: Chemical and Biological Treatment Of Chromium (Vi)mentioning

confidence: 99%

See 1 more Smart Citation

The Geomicrobiology of Chromium (VI) Pollution: Microbial Diversity and its Bioremediation Potential

Al-Battashi

Joshi²,

Pracejus³

et al. 2016

TOBIOTJ

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Abstract:The role and significance of microorganisms in environmental recycling activities marks geomicrobiology one of the essential branches within the environmental biotechnology field. Naturally occurring microbes also play geo-active roles in rocks, leading to biomineralization or biomobilization of minerals and metals. Heavy metals, such as chromium (Cr), are essential micronutrients at very low concentrations, but are very toxic at higher concentrations. Generally, heavy metals are leached to the environment through natural processes or anthropogenic activities such as industrial processes, leading to pollution with serious consequences. The presence of potentially toxic heavy metals, including Cr, in soils does not necessarily result in toxicity because not all forms of metals are toxic. Microbial interaction with Cr by different mechanisms leads to its oxidation or reduction, where its toxicity could be increased or decreased. Chromite contains both Cr(III) and Fe(II) and microbial utilization of Fe(II)-Fe(III) conversion or Cr (III) -Cr (VI) could lead to the break-down of this mineral. Therefore, the extraction of chromium from its mineral as Cr (III) form increases the possibility of its oxidation and conversion to the more toxic form (Cr (VI)), either biologically or geochemically. Cr (VI) is quite toxic to plants, animals and microbes, thus its levels in the environment need to be studied and controlled properly. Several bacterial and fungal isolates showed high tolerance and resistance to toxic Cr species and they also demonstrated transformation to less toxic form Cr (III), and precipitation. The current review highlights toxicity issues associated with Cr species and environmental friendly bioremediation mediated by microorganisms.

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Section: Chromium Pollutionmentioning

confidence: 99%

Section: Chemical and Biological Treatment Of Chromium (Vi)mentioning

confidence: 99%

The Geomicrobiology of Chromium (VI) Pollution: Microbial Diversity and its Bioremediation Potential

Al-Battashi

Joshi²,

Pracejus³

et al. 2016

TOBIOTJ

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“…The NF obtained by electrospinning exhibit unique properties such as; small pore sizes, high pore density, large surface-to-volume ratio and design flexibility for particular physical and chemical functionalization (Aussawasathien et al, 2008;Greiner and Wendorff, 2007;Li and Xia, 2004;Pant et al, 2013;Ramakrishna et al, 2005Ramakrishna et al, , 2006Wendorff et al, 2012). Owing to their remarkable properties, electrospun NF and their nanowebs are especially promising candidates to be used in membranes/filters and environmental applications (Aluigi et al, 2014;Aussawasathien et al, 2008;Pant et al, 2013;Uyar et al, 2010a;Wang et al, 2013;Xie et al, 2008;Yoon et al, 2008;Pant et al, 2014). Moreover, these nanowebs can naturally overclass the powder type of absorbents/adsorbent, since it is simultaneously possible to provide molecular encapsulation and particle capturing during the filtration process by using electrospun NF.…”

Section: Introductionmentioning

confidence: 99%

Molecular entrapment of volatile organic compounds (VOCs) by electrospun cyclodextrin nanofibers

et al. 2016

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In this paper, we reported the molecular entrapment performance of hydroxypropyl-beta-cyclodextrin (HPβCD) and hydroxypropyl-gamma-cyclodextrin (HPγCD) electrospun nanofibers (NF) for two common volatile organic compounds (VOCs); aniline and benzene. The encapsulation efficiency of CD samples were investigated depending on the various factors such as; CD form (NF and powder), electrospinning solvent (DMF and water), CD (HPβCD and HPγCD) and VOCs (aniline and benzene) types. BET analysis indicated that, electrospun CD NF have higher surface area compared to their powder form. In addition DMA measurement provided information about the mechanical properties of CD NF. The encapsulation capability of CD NF and CD powder was investigated by 1H-NMR and HPLC techniques. The observed results suggested that, CD NF can entrap higher amount of VOCs from surroundings compared to their powder forms. Besides, molecular entrapment efficiency of CD NF also depends on CD, solvent and VOCs types. The inclusion complexation between CD and VOCs was determined by using TGA technique, from the higher decomposition temperature of VOCs. Finally, our results were fortified by the modeling studies which indicated the complexation efficiency variations between CD and VOC types. Here, the inclusion complexation ability of CD molecules was combined with very high surface area and versatile features of CD NF. So these findings revealed that, electrospun CD NF can serve as useful filtering material for air filtration purposes due to their molecular entrapment capability of VOCs. © 2015 Elsevier Ltd

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“…Due to high toxicity and bioaccumulation of Cr (VI), the removal of Cr (VI) ions from contaminated aqueous solution is the great importance. Based on the World Health Organization (WHO), maximum permissible concentration of Cr (VI) ions in drinking water has been reported 0.01 mg/L, whereas US Environmental Protection Agency (EPA) has set the maximum contaminate level for Cr (VI) at 0.1 mg/L (Lv et al, 2011;Wang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Preparation and application of silver oxide/sawdust nanocomposite for Chromium(VI) ion removal from aqueous solutions using column system

2017

Global NEST Journal

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This study describes the removal of Cr (VI) ions from aqueous solutions using silver oxide/sawdust nanocomposite (Ag2O/SD NC) that was prepared using the chemical precipitation method. Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR) techniques were used for characterization of Ag2O/SD NC. The effect of various parameters such as feed solution pH (2, 6, and 10), influent concentration of Chromium (VI) (25-100 mg/L), flow rate (1-5 mL/min) and bed depth (4-12 cm) on breakthrough curves (BTC) were investigated. Three wellknown column adsorption kinetics models including Thomas, Adams-Bohart and Bed Depth Service Time (BDST) models were applied to fitting the column experimental data. Based on Thomas model, the equilibrium adsorption reached 13.41 mg/g when a Cr (VI) polluted solution with influent concentration of 25 mg/L Cr (VI) passed through the column with a flow rate of 2 mL/min. Desorption studies reveal that recovery of uploaded Cr (VI) from the Ag2O/SD NC adsorbent or exhausted column regeneration can readily be achieved using a dilute solution of NaOH (0.01 M) as eluent. This study indicated that the Ag2O/SD NC can be used as an effective, efficient and environmentally friendly adsorbent for the removal of Cr (VI) ions from water resources.

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Polyacrylonitrile/polypyrrole core/shell nanofiber mat for the removal of hexavalent chromium from aqueous solution

Cited by 270 publications

References 45 publications

The Geomicrobiology of Chromium (VI) Pollution: Microbial Diversity and its Bioremediation Potential

The Geomicrobiology of Chromium (VI) Pollution: Microbial Diversity and its Bioremediation Potential

Molecular entrapment of volatile organic compounds (VOCs) by electrospun cyclodextrin nanofibers

Preparation and application of silver oxide/sawdust nanocomposite for Chromium(VI) ion removal from aqueous solutions using column system

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