Manganese dioxide nanowhiskers: A potential adsorbent for the removal of Hg(II) from water

Lisha, K.P.; Maliyekkal, Shihabudheen M.; Pradeep, Thalappil

doi:10.1016/j.cej.2010.03.031

Cited by 76 publications

(32 citation statements)

References 32 publications

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“…Conventionally, carbon absorbents, ion exchange, reverse osmosis, precipitation and electrochemical treatment are used (Akpor and Muchie 2010;Okoronkwo et al 2007;Wang et al 2009). In a recent work, even the use of gold and manganese oxide nanoparticles have been found to be promising (Lisha et al 2010;Kamarudin and Mohamad 2010). However, these processes are in their early stage of development.…”

Section: Introductionmentioning

confidence: 99%

Mercury bioremediation by mercury accumulating Enterobacter sp. cells and its alginate immobilized application

Sinha

Khare

2011

Biodegradation

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The effective microbial remediation of the mercury necessitates the mercury to be trapped within the cells without being recycled back to the environment. The study describes a mercury bioaccumulating strain of Enterobacter sp., which remediated mercury from the medium simultaneous to its growth. The transmission electron micrographs and electron dispersive X-ray analysis revealed the accumulation of remediated mercury as nano-size particles in the cytoplasm as well as on the cell wall. The Enterobacter sp. in the present work was able to accumulate mercury, without being engineered in its native form. The possibility of recovering the accumulated mercury from the cells is also indicated. The applicability of the alginate immobilized cells in removing mercury from synthetic and complex industrial effluent in a batch mode was amply demonstrated. The initial load of 7.3 mg l(-1) mercury in the industrial effluent was completely removed in 72 h. The cells immobilized in calcium alginate were similarly effective in the complete removal of 5 mg l(-1) HgCl(2) of mercury from the synthetic effluent in less than 72 h. The immobilized cells could be reused for multiple cycles.

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Section: Introductionmentioning

confidence: 99%

Mercury bioremediation by mercury accumulating Enterobacter sp. cells and its alginate immobilized application

Sinha

Khare

2011

Biodegradation

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“…5. The spectrum shows two C1s peaks for the adsorbed composite sample ( with Hg(II) 37,38 is not well resolved due to contamination and signicant noise in the Hg 4f region of XPS spectra. Because EDAX and elemental mapping indicates adsorbed Hg(II), the appearance of the peak at 102.5 eV can be considered as the Hg 4f peak for Hg(II).…”

Section: X-ray Photon Spectroscopy (Xps)mentioning

confidence: 99%

Cerium functionalized PVA–chitosan composite nanofibers for effective remediation of ultra-low concentrations of Hg(ii) in water

et al. 2015

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Mercury contaminated drinking water significantly affects the central nervous system, kidneys and other organs in humans even at very low concentration. Higher concentration of mercury are reported to be effectively removed by adsorption and precipitation techniques. Reverse osmosis (RO) is a better known technique used for the removal of low concentration of Hg (<200 ppb). However, its limitations include low flux, high water rejection, high capital cost, in addition to being power dependent. The present study reports the fabrication of low cost, biodegradable, electrospun cerium functionalized PVA-chitosan

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“…Manganese dioxide (MnO 2 ) is a one of the most important scavengers of trace metals in the environment, and has been extensively studied as an effective adsorbent to remove heavy metals from water [15][16][17]. Apart from its excellent heavy metal uptake capacity, MnO 2 is a promising electrode material for electrochemical supercapacitors because of its high specific capacitance, good cycle stability, low cost, eco-friendly nature and abundant availability [18,19].…”

Section: Introductionmentioning

confidence: 99%

Preparation of a manganese dioxide/carbon fiber electrode for electrosorptive removal of copper ions from water

Liu

Lan

et al. 2015

Journal of Colloid and Interface Science

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a b s t r a c tMnO 2 is an effective adsorbent for many metal ions and a promising electrode material for electrochemical supercapacitors. In this paper, we successfully combined the two functions through preparing a MnO 2 /carbon fiber (CF) composite as an electrosorptive electrode. The thin MnO 2 film was deposited onto CF by an anodic eletrodeposition method. The MnO 2 /CF electrodes had ideal pseudocapacitive behavior and high capacitive reversibility. The specific capacitance of the MnO 2 /CF electrode reached a maximum value of 387 F/g, which is quite competitive compared with literature values. At 0.8 V applied potential, the maximum Cu 2+ adsorption capacity of the MnO 2 /CF electrode was 172.88 mg/g, which is more than 2 times higher than common MnO 2 adsorbents without an electric field imposed. SEM images showed that MnO 2 nanoflowers with several ''petals'' were uniformly distributed on the CF surface. Enhancement of adsorption by the polarization potential and the unique microstructure of the deposited MnO 2 may be the source of the outstanding adsorption ability of the MnO 2 /CF electrode. The MnO 2 /CF electrode could be regenerated quickly by reversing the voltage. The deposition time of 1000 s was optimum for achieving maximum capacitance and Cu 2+ removal performance. The MnO 2 /CF composite electrosorptive electrode is a promising candidate for Cu 2+ removal from aqueous solution.

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Manganese dioxide nanowhiskers: A potential adsorbent for the removal of Hg(II) from water

Cited by 76 publications

References 32 publications

Mercury bioremediation by mercury accumulating Enterobacter sp. cells and its alginate immobilized application

Mercury bioremediation by mercury accumulating Enterobacter sp. cells and its alginate immobilized application

Cerium functionalized PVA–chitosan composite nanofibers for effective remediation of ultra-low concentrations of Hg(ii) in water

Preparation of a manganese dioxide/carbon fiber electrode for electrosorptive removal of copper ions from water

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