Capture of mercury ions by natural and industrial materials

Natale, F. Di; Lancia, A.; Molino, Antonio; Natale, Michele Di; Karatza, Despina; Musmarra, Dino

doi:10.1016/j.jhazmat.2005.09.046

Cited by 166 publications

(68 citation statements)

References 33 publications

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“…Moreover, accumulation of mercury in human body could lead to various kinds of cognitive and motor disorders as well as Minamata disease [57]. Many sources are to blame for the generation of mercury, for example, coal plants, gold production, measuring instrument, and mercury lamps [58]. Mercury is mainly uptaken by human beings through daily diet such as fish, and it is vital that considerable efforts should focus on the development and evolution of sensitive and selective detection methods.…”

Section: ) Detectionmentioning

confidence: 99%

Nanoscaled Fluorescent Films and Layers for Detection of Environmental Pollutants

Yin¹,

Ji²

2017

Nanoscaled Films and Layers

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Hazardous gas and ion pollutants are the most serious environmental problems around the world. It is of great importance to develop devices for easy detection of these hazardous substances. Fluorescence technology with high resolution and operational simplicity has attracted a lot of attention in recent years. Organic fluorescent dyes absorb/emit lights within a broad wavelength range, which is suitable for various demands. Chromophores, such as perylene, cyanine dyes, spiropyran, and so on, are widely studied as fluorescent probes for gases and ions. The dyes could respond to external stimuli through structural changes of the conjugated chromophore itself or the attached functional groups, leading to detectable spectral changes. Organic dyes are incorporated into nanoscaled films and layers, which are portable and durable for effective sensing in complex environments. In this chapter, preparation and application of fluorescent films and layers (FFL) for gaseous/ionic detection are reviewed. We discuss the response mechanism of fluorescent dyes, the fabrication of nanoscaled FFL, and some examples of FFL for the detection of gas and ion pollutants.

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Section: ) Detectionmentioning

confidence: 99%

Nanoscaled Fluorescent Films and Layers for Detection of Environmental Pollutants

Yin¹,

Ji²

2017

Nanoscaled Films and Layers

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“…peat (Viraraghavan and Kapoor 1995), chitosan and its derivatives (Miretzky and Fernandez Cirelli 2009) or inorganic: e.g. dispersed iron oxide, hydrous manganese and tin oxides , Fe oxyhydroxide (FeOOH) and Fe/Mn oxyhydroxides (Kokkinos et al 2014), zeolites (Chojnacki et al 2004), clays (Eloussaief et al 2013;Viraraghavan and Kapoor 1994), pozzolana and yellow tuff (Di Natale et al 2006) and synthetic titanosilicates (Otero et al 2009) or magnetic di-thio functionalized mesoporous silica nanoparticles (Mehdinia et al 2015). Also, a wide array of wastes have been proposed-either used directly or as precursors-as novel low-cost Hg adsorbents (Bhattacharyya et al 2013;Miretzky and Fernandez Cirelli 2009), and these include agricultural (e.g.…”

Section: Introductionmentioning

confidence: 99%

Use of red mud (bauxite residue) for the retention of aqueous inorganic mercury(II)

Rubinos

Barral

2015

Environ Sci Pollut Res

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The effectiveness of the oxide-rich residue from bauxite refining (red mud) to remove inorganic Hg(II) from aqueous solutions was assessed. The aspects studied comprised the kinetics of the process (t = 1 min-24 h), the effect of pH (3.5-11.5), the interacting effect between salt concentration (0.01-1 M NaNO3) and pH and the Hg(II) sorption isotherm. Hg leaching from spent red mud was evaluated using the toxicity characteristics leaching procedure (TCLP) method. The sorption of Hg(II) onto red mud was very fast, with most of Hg(II) (97.0-99.7%) being removed from 0.5-50 μM Hg solutions in few minutes. The kinetic process was best described by Ho's pseudo-second order equation, pointing to chemisorption as the rate controlling step. Hg(II) sorption efficiency was very high (% removal between 93.9 and 99.8%) within all the studied pH range (3.5-11.5) and added Hg concentrations (5 and 50 μM), being optimal at pH 5-8 and decreasing slightly at both lowest and highest pH. The effect of background electrolyte concentration suggests specific sorption as the main interaction mechanism between Hg(II) and red mud, but the increasing non-sorbed Hg concentrations at low and high pH for higher electrolyte concentrations also revealed the contribution of an electrostatic component to the process. The sorption isotherm showed the characteristic shape of high affinity sorbents, and it was better described by the Redlich-Peterson and Freundlich equations, which are models that assume sorbent heterogeneity and involvement of more than one mechanism. The estimated Hg(II) sorption capacity from the Langmuir equation (q m ~9 mmol/kg) was comparable to those of some inorganic commercial sorbents but lower than most bio- or specifically designed sorbents. The leachability of retained Hg(II) from spent red mud (0.02, 0.25 and 2.42 mmol Hg/kg sorbed concentration) was low (0.28, 1.15 and 2.23 μmol/kg, respectively) and accounted for 1.2, 0.5 and 0.1% of previously sorbed Hg, indicating that Hg(II) is tightly bound by red mud once sorbed.

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“…Various treatment techniques have been reported and applied for removal of such heavy metals from industrial wastewaters including precipitation (Kurniawan et al 2006;U.S. EPA 1980;Ayres et al 1984), ion-exchange (Chiarle et al 2000;Yang and Renken 2000), membrane processes (Tang et al 2007;Srisuwan and Thongchai 2002;Bessbousse et al 2010), adsorption (Basha et al 2009;Bayramoglu and ArIca 2008;Bhatnagar and Sillanpää 2010;Di Natale et al 2006;Ekinci et al 2002;Olivares-Marin et al 2008;Shafaei et al 2007) etc. Most of these methods suffer from drawbacks like high capital and operational cost and there are also problems in disposal of the residual metal sludge (Namasivayam and Sangeetha 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Most of these methods suffer from drawbacks like high capital and operational cost and there are also problems in disposal of the residual metal sludge (Namasivayam and Sangeetha 2006). In numerous researches carried out in this field (Basha et al 2009;Bayramoglu and ArIca 2008;Bhatnagar and Sillanpää 2010;Di Natale et al 2006;Ekinci et al 2002), it is established that adsorption using activated carbons and especially low cost adsorbents could be a satisfying technique for the removal of trace amounts of metal ions from dilute aqueous systems in the final steps of wastewater treatment processes. Because of the generic porous and chemical structure, virgin activated carbons are able to adsorb most of the pollutants in the wastewater, and so they are not very selective adsorbents towards mercury.…”

Section: Introductionmentioning

confidence: 99%

A comparison on efficiency of virgin and sulfurized agro-based adsorbents for mercury removal from aqueous systems

Asasian

Kaghazchi

2012

Adsorption

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Mercury adsorption by sulfur impregnated adsorbents seems to be one of the most efficient ways for removal of this toxic metal ion from wastewater and atmosphere. The aim of this work was to develop a method for preparation of low-cost sulfurized adsorbent from agricultural wastes; this approach combines two stages of (i) chemical activation with phosphoric acid and (ii) impregnation with powdered sulfur, in one step only. The physico-chemical properties of sulfurized adsorbent (AC-S) were determined with BET, FT-IR, Eschka method and pH PZC measurements, and compared with those of the virgin sample (AC). It was found that sulfurization according to this method can introduce about 8 wt.% sulfur into the structure of adsorbent, in the forms of C-S, S-H, S-S and S=O functional groups. Although during the sulfur introduction processes, a decrease in surface area and micropore volume of the sulfurized adsorbent is to be expected, not only such decrease did not occur in this work, but a large increase in microporosity was seen. Thereupon, both the sulfur functionalities and extended microporosity of AC-S lead to higher capability of this sample for mercury adsorption rather than AC. Finally, the kinetics and equilibrium of mercury adsorption from aqueous solutions were studied for AC and AC-S. Nomenclature BConstant of D-R isotherm related to energy, (mol 2 /J 2 ) C 0 the solute concentration at time t = 0, (mg/l) C t the solute concentration at time t, (mg/l) C e the solute concentration at equilibrium, (mg/l) [in D-R model (g/g)] ePolanyi potential in D-R model E Free energy of adsorption, (J/mol) h (= k 2 q 2 e ) the initial sorption rate, (mg/g min) k 1 Pseudo-first-order adsorption rate constant, (1/min) k 2 Pseudo-second-order adsorption rate constant, (g/mg min) K F Freundlich empirical constant, (mg/g)(mg/l) −1/n K L Langmuir empirical constant (l/mg) K T Equilibrium binding constant corresponding the maximum binding energy, (l/mg) n the exponent in Freundlich isotherm N the number of runs p the number of model's parameters q i,exp the amount of solute adsorbed on the adsorbent observed from the ith run of experiment, (mg/g) q i,calc the amount of solute adsorbed on the adsorbent estimated from the model for corresponding q i,exp , (mg/g) q t the amount of solute adsorbed at time t, (mg/g) q e the amount of solute adsorbed at equilibrium, (mg/g) [in D-R model (mol/g)] q m Monolayer adsorption capacity (in Langmuir model (mg/g)), (in D-R model the theoretical monolayer saturation capacity (mol/g)) RUniversal gas constant, (8.313 J/mol K) R 2 Correlation coefficient RMSE Root mean squared error function t Time, (min) 190 Adsorption (

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Capture of mercury ions by natural and industrial materials

Cited by 166 publications

References 33 publications

Nanoscaled Fluorescent Films and Layers for Detection of Environmental Pollutants

Nanoscaled Fluorescent Films and Layers for Detection of Environmental Pollutants

Use of red mud (bauxite residue) for the retention of aqueous inorganic mercury(II)

A comparison on efficiency of virgin and sulfurized agro-based adsorbents for mercury removal from aqueous systems

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