Lead Removal from Synthetic Leachate Matrices by a Novel Ion-Exchange Material

Street, Kenneth W.; Hovanitz, Edward S.; Chi, Sulan

doi:10.1080/10473289.2002.10470840

Cited by 6 publications

(11 citation statements)

References 2 publications

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“…Figure 1 indicates the equilibrium pH over the film at various stages of conversion from the acid form to the salt form. Also shown in the figure for comparison are the powder 4 and the fiberglass-reinforced film, 9 both of which were cross-linked with glutaraldehyde such that 7.5 percent of the PVA alcohol sites are reacted during the cross-linking procedure.…”

Section: Acid-base Propertiesmentioning

confidence: 99%

“…Similar results have been demonstrated for Cu 2+ uptake on IEM beads. 4 Since the material is a weak acid, its ion-exchange properties depend on the pH. Figure 3 shows the pH dependence of metal uptake for lead, cadmium, copper, mercury, and zinc.…”

Section: Acid-base Propertiesmentioning

confidence: 99%

“…Fortunately, the IEM is used in the Ca form and a similar titration with Ca(OH) 2 does not cause the deterioration or leakage described in earlier works. 3,4 Five pieces of IEM were cycled through Ca charging followed by reconversion to the acid form 10 times, and the results are presented in figure 2. No deterioration of the films was noted during the recycling and the capacities determined were typical of this IEM.…”

Section: Acid-base Propertiesmentioning

confidence: 99%

“…Although the IEM described in this paper is exclusively in the film form, the flexibility of the chemical processing to make the polymer permits it to be produced in other forms, including spherical beads, 6 irregular granules, 2 powder, 4 fibers, coated magnetic particles, coatings on irregular objects, 7 and fiberglass-reinforced film. 8,9 The other forms appear to behave similarly to the material described herein although exceptions have been noted; for example, the operational pH range for the powder exchanging bound Ca 2+ by Cu 2+ is extended on the basic side and the kinetics are much faster.…”

Section: Introductionmentioning

confidence: 99%

“…The current versions of the IEM are easily produced by environmentally friendly chemistry and include an optically transparent film. [2][3][4][5][6] The new IEM has several advantages over commercial resins. For many of these resins, calcium, normally present in natural waters, competes with the metal ions, thus rendering the beads less effective for heavy-metal removal.…”

Section: Introductionmentioning

confidence: 99%

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Properties of a Novel Ion-Exchange Film

Street

Hill²,

Philipp³

et al. 2004

Ind. Eng. Chem. Res.

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A new ion-exchange material [based on poly(acrylic acid)] and some of its analytical applications have been reported. This paper contains data on the ion-exchange properties of the film form of the material and its potential application to the decontamination of wastewater and drinking water. The film has a high exchange capacity of 5−6 mequiv/g and a pK a of 5.7. The calcium form is the most effective for removing metal ions from solution, and the optimum pH range is between 5 and 7. The exchange rates are slower for the film form than for the bead and powder forms of the ion-exchange material; otherwise, the properties are similar. The film is effective when hard water solutions are employed and also when metal ions are in the complex matrix of wastewater from electroplating. The film can be used in flow systems having a flow channel large enough to allow passage of turbid solutions.

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Section: Acid-base Propertiesmentioning

confidence: 99%

Section: Acid-base Propertiesmentioning

confidence: 99%

Section: Acid-base Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of a Novel Ion-Exchange Film

Street

Hill²,

Philipp³

et al. 2004

Ind. Eng. Chem. Res.

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Low molecular weight poly(acrylic acid) as a salt scaling inhibitor in oilfield operations

Moulay

Boukherissa

Abdoune

et al. 2005

JICS

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Poly(acrylic acid) (PAA) samples with molecular weights between 820 and 2950 were synthesized by a solution polymerization process using an initiating redox system. The obtained PAAs were then screened for their ability to inhibit salt scale formation. In this screening system, salt scale was formed by injecting pit water into the oil. The salt scale inhibition efficiency was higher for PAAs at a higher concentration and for lower molecular weight PAAs. A reduction of pH, extension of stirring time, or an increase in temperature caused the inhibition efficiency of the PAAs to drop. An optimal inhibition efficiency of 98.70% was observed using a PAA with a molecular weight of 820 at a concentration of 20 ppm, at 20 °C, while being stirred for 1 h at a pH of 6.029.

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Application of artificial neural network for prediction of Pb(II) adsorption characteristics

Dutta

Basu

2012

Environ Sci Pollut Res

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The adsorption of Pb(II) onto the surface of microwave-assisted activated carbon was studied through a two-layer feedforward neural network. The activated carbon was developed by microwave activation of Acacia auriculiformis scrap wood char. The prepared adsorbent was characterized by using Brunauer-Emmett-Teller (BET) surface area analyzer, scanning electron microscope (SEM), and X-ray difractometer. In the present study, the input variables for the proposed network were solution pH, contact time, initial adsorbate concentration, adsorbent dose and temperature, whereas the output variable was the percent Pb(II) removal. The network had been trained by using different algorithms and based on the lowest mean squared error (MSE) value and validation error, resilient backpropagation algorithm with 12 neurons in the hidden layer was selected for the present investigation. The tan sigmoid and purelin transfer function were used in the hidden and the output layers of the proposed network, respectively. The model predicted and experimental values of the percent Pb(II) removal were also compared and both the values were found to be in reasonable agreement with each other. The performance of the developed network was further improved by normalizing the experimental data set and it was found that after normalization, the MSE and validation error were reduced significantly. The sensitivity analysis was also performed to determine the most significant input parameter.

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Lead Removal from Synthetic Leachate Matrices by a Novel Ion-Exchange Material

Cited by 6 publications

References 2 publications

Properties of a Novel Ion-Exchange Film

Properties of a Novel Ion-Exchange Film

Low molecular weight poly(acrylic acid) as a salt scaling inhibitor in oilfield operations

Application of artificial neural network for prediction of Pb(II) adsorption characteristics

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