Metal removal from wastewater using peat

Brown, Pauline; Gill, Sarah; Allen, Stephen

doi:10.1016/s0043-1354(00)00152-4

Cited by 550 publications

(322 citation statements)

References 29 publications

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“…Adsorption is a widely used technique for the removal of low concentrations of heavy metals from water, and the effectiveness of various adsorbents has been demonstrated over many years in different water and wastewater applications (Babel and Kurniawan, 2003;Brown et al, 2001). Activated carbon (AC) is one of the most common industrial adsorbents used for mercury removal Kurniawan et al, 2006;), yet various studies have shown practical limitations.…”

Section: Introductionmentioning

confidence: 99%

“…Even in a welloperated system regeneration of the carbon may result in a loss of ~15% of the original material; this coupled with the use of complexing agents to improve performance can result in substantial waste generation (Babel and Kurniawan, 2003;. Fly ash , clay , zeolite ) and peat moss (Brown et al, 2001) have also been commonly used as adsorbents because their structure provides sufficient surface area for adsorption. In all cases, however, the presence of an ill-defined pore structure (Hahn et al, 1996;Yoshitake et al, 2002) has a hindering effect on diffusion, which may lead to a decrease in the adsorption rate and the available capacity (Hu et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water

2012

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The preparation and testing of thiol-functionalised silica-coated magnetite nanoparticles (TF-SCMNPs) is described. The characteristics of these particles are assessed at different stages in the production process using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), and a magnetometer. The particles were found to be almost spherical with a uniform mesoporous structure with a pore size of ~2.1 nm. The particles were strongly responsive to an external magnetic field making separation from solution possible in less than 1 min. The adsorption characteristics of the particles were quantified in a series of isotherm experiments using Hg(II) solution concentrations between 40 and 1000 μg l -1 at adsorbent concentrations of 4 and 8 mg l -1 . The adsorption capacity was higher than for other commonly used adsorbents with 90% of Hg(II) removed during the first 5 min and equilibrium in less than 15 min. Both the Langmuir and Freundlich isotherm models were applied to the isotherm data and the maximum adsorption capacity was achieved when the ratio of adsorbent to adsorbate was low. temperature and pH had an effect on adsorption but when the TF-SCMNPs were used for removal of Hg(II) from tap water and bottled water, which contained other ions, there appeared to be no interference. Hg(II) could be successfully desorbed using thiourea in a 3M HCl solution; this did not result in the destruction of the nanoparticles and they could subsequently be reused without loss of their activity in repetitive adsorption tests.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water

2012

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“…Conventional methods for the removal of the heavy metal ions from wastewaters include chemical precipitation, electro flotation, ion exchange, reverse osmosis and adsorption onto activated carbon. These methods have been found to be limited, since they often involve high capital and operational costs, incomplete removal (Brown et al 2000), and may be associated with the generation of secondary waste which is again to be treated or to be safely disposed off (Chandra et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

Dubey¹,

Mishra²,

Singhal³

2013

Int. J. Environ. Sci. Technol.

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Heavy metals are a threat to human health and ecosystem. These days, great deal of attention is being given to green technologies for purification of water contaminated with heavy metal ions. Biosorption is one among such emerging technologies, which utilizes naturally occurring waste materials to sequester heavy metals from wastewater. Cadmium has hazardous impact on living beings; therefore, its removal through green and economical process is an important task. The aim of the present study was to utilize the locally available Portulaca oleracea plant biomass as an adsorbent for cadmium removal from aqueous solution. The biomass was obtained after drying and grinding the portulaca leaves and stem. No chemical treatment was done on the adsorbent so that it remained green in a true sense. Batch experiments were performed at room temperature. The critical parameters studied were effects of pH, contact time, initial metal ion concentration and adsorbent dose on the adsorption of cadmium. The maximum adsorption was found to be 72 %. The kinetic data were found to best fit the pseudo-secondorder equation. High adsorption rates were obtained in the initial 45 min, and adsorption equilibrium was then gradually achieved in about 100 min. Adsorption increased with increase in pH for a range 2 and 6. The equilibrium adsorption results closely followed both the Langmuir and Freundlich isotherms. The values of constants were calculated from isotherms. Results indicated that portulaca plant biomass could be developed as a potential material to be used in green water treatment devices for removal of metal ions.

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“…(Cain et al, 2008;Oliveira et al, 2005;Orhan and Buyukgungor, 1993). Among these biomaterials, marine algae and peat moss have been studied extensively to remove heavy metals from contaminated effluents (Zümriye, 1997;Brown et al, 2000). However, besides a strong metallic affinity, the search for easily available sorbents has led to the investigation of materials of agricultural origin as potential metal sorbents Sheth and Soni, 2004).…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

Pelit

Ertaş

Eroğlu

et al. 2011

Bioresource Technology

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a b s t r a c tAside from its excellent mechanical properties, spider silk (SS) would offer an active surface for heavy metal interaction due to its rich protein structure. The present study describes the potential use of natural (SS) as a sorbent of heavy metals from aqueous solutions. Single and multi-species biosorption experiments of heavy metals by natural SS were conducted using batch and column experiments. The biosorption kinetics, in general, was found to follow the second-order rate expression, and the experimental equilibrium biosorption data fitted reasonably well to Freundlich isotherm. From the Freundlich isotherm, the biosorption capacities of Cu(II) and Pb(II) ions onto SS were found as 0.20 and 0.007 mmol g -1 , respectively. The results showed a decrease in the extent of metal ion uptake with lowering the pH.

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Metal removal from wastewater using peat

Cited by 550 publications

References 29 publications

Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water

Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water

Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

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