Stability constants for the formation of lead chloride complexes as a function of temperature and ionic strength

Luo, Yanxin; Millero, Frank J.

doi:10.1016/j.gca.2006.09.019

Cited by 41 publications

(36 citation statements)

References 19 publications

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“…The observed decrease in the quantity of Pb adsorbed at temperature 328 K is evidence of the exothermic interaction of Pb with the resin surface [48] and also the validity of the thermodynamic constant of Pb at 288-300 K resulting in process reversal as reported in the studies of Seward [49] and Luo and Yanxin [50]. Figure 5.…”

Section: Ph and Temperature Dependence Of The Resins On Pb 2+ Uptakementioning

confidence: 71%

Removal of Pb2+ from Water by Synthesized Tannin Resins from Invasive South African Trees

Okoli

Shilowa

Anyanwu

et al. 2018

Water

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Contamination of water by Pb2+ and the threat of invasive vegetation affects the quality and quantity of water accessible to all life forms and has become a primary concern to South Africa and the world at large. This paper synthesized, characterized, and evaluated the resins from tannin-rich invasive Acacia species as an environmentally benign Pb 2+ adsorbent. The analysis of the pore volume and surface area of the resins reveals a small pore dimension of 9 × 10 −3 cc/g and large surface area (2.31-8.65 m 2 /g), presenting suitable physical parameters for adsorption of Pb 2+ . Langmuir model offers the best correlation data at pH 6 with maximum monolayer coverage capacity of 189.30, 105.70 and 98.82 mg/g for silver, black and green wattle tannin resins in aqueous solutions, respectively. The kinetic data suitably fits into a pseudo-second-order model, with the Dubinin-Radushkevich adsorption energy (E) ≤ 7.07 KJ/mol and intra-particle diffusion model confirming an associated physisorption process within the bio-sorption system. The thermogravimetric analysis (TGA) and Fourier-transform infrared (FT-IR) data of the resins were informative of the high thermal stability and chelating functionality such as -OH and -NH 2 responsible for the removal of Pb 2+ . All the resins showed good adsorption characteristics while silver wattle tannin resin has the best adsorption capacity compared to black and green wattle tannin resins. This study provides a prototype adsorbent from invasive plants for the removal of Pb 2+ in water.

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Section: Ph and Temperature Dependence Of The Resins On Pb 2+ Uptakementioning

confidence: 71%

Removal of Pb2+ from Water by Synthesized Tannin Resins from Invasive South African Trees

Okoli

Shilowa

Anyanwu

et al. 2018

Water

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“…4 and 5. Three component data sets consist of works that contain formation constants at multiple ionic strengths (Mironov et al 1963;Bendiab et al 1982; and a subset of Luo and Millero 2007); the fourth component data set is constructed (Powell et al 2009) from data in eight publications that each present formation constant data at a single ionic strength.…”

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confidence: 99%

“…We use measurements of log Cl b 1 , log Cl b 2 , and log Cl b 3 obtained by Luo and Millero (2007) at ionic strengths between 0.13 and 0.44 molal to refine the Powell et al (2009) SIT analysis of a portion of the Luo and Millero (2007) data. We also use an extensive set of log Cl b 1 , log Cl b 2 , and log Cl b 3 values obtained in HClO 4 -HCl mixtures, NaCl-NaClO 4 mixtures, MgCl 2 solutions, and CaCl 2 solutions, all at 25°C (Byrne and Miller 1984), to generate additional SIT assessments of lead chloride complexation behavior.…”

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Complexation of Pb(II) by Chloride Ions in Aqueous Solutions

et al. 2010

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Lead chloride formation constants at 25°C were derived from analysis of previous spectrophotometrically generated observations of lead speciation in a variety of aqueous solutions (HClO 4 -HCl and NaCl-NaClO 4 mixtures, and solutions of MgCl 2 and CaCl 2 ). Specific interaction theory analysis of these formation constants produced coherent estimates of (a) PbCl ? , PbCl 0 2 , and PbCl 3 -formation constants at zero ionic strength, and (b) well-defined depictions of the dependence of these formation constants on ionic strength. Accompanying examination of a recent IUPAC critical assessment of lead formation constants, in conjunction with the spectrophotometrically generated formation constants presented in this study, revealed significant differences among various subsets of the IUPAC critically selected data. It was found that these differences could be substantially reduced through reanalysis of the formation constant data of one of the subsets. The resulting revised lead chloride formation constants are in good agreement with the formation constants derived from the earlier spectrophotometrically generated data. Combining these data sets provides an improved characterization of lead chloride complexation over a wide range of ionic strengths:

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“…When 15 producing geothermal brine for heat or electricity production the physicochemical conditions 16 of the brine often change resulting in a potential oversaturation of those salts. Mineral 17 precipitations ("scaling") generally represent a problem for geothermal power plant operation 18 because they are clogging pipes thereby reducing the fluid flow through the system or they 19 are coating the heat exchanger and thus reducing the efficiency of the geothermal plant. If 20 these precipitates form within the pores of a reservoir, it might even results in reservoir 21 damage and in complete failure of the system.…”

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confidence: 99%

“…6), both, at highest OH -concentration and highest temperature also 13 forms fibrous aggregates and can, therefore, not visually be differentiated from laurionite. prevented by application of scale inhibitors leaving the remaining scale (mainly galena, PbS) 19 to be enriched with the radioactive Pb. These "purer" Pb-scales are consequently less diluted 20 with other scaling minerals and therefore of higher radioactivity.…”

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confidence: 99%

Formation and significance of laurionite in geothermal brine

2016

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Stability constants for the formation of lead chloride complexes as a function of temperature and ionic strength

Abstract: The stability constants for the formation of lead (Pb 2+ ) with chloride have been determined using a spectrophotometric method in NaClO 4 solutions as a function of ionic strength (0-6 m) and temperature (15-

Cited by 41 publications

References 19 publications

Removal of Pb2+ from Water by Synthesized Tannin Resins from Invasive South African Trees

Removal of Pb2+ from Water by Synthesized Tannin Resins from Invasive South African Trees

Complexation of Pb(II) by Chloride Ions in Aqueous Solutions

Formation and significance of laurionite in geothermal brine

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