Basic Salts of Lead Nitrate Formed in Aqueous Media<sup>1</sup>

Pauley, J. L.; Testerman, M. K.

doi:10.1021/ja01645a062

Cited by 27 publications

(5 citation statements)

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“…x = 1.2). This titration curve explains the presence of a large amount of nitrates in the precipitate of lead hydroxide as already reported [15]. A titration of the K3NbO 4 solution by a solution of Mg(NO3)2 has also been performed.…”

Section: Preparation and Characterization Of The Solutionssupporting

confidence: 80%

“…lb). This is due to the fact that the precipitation of lead nitrate by a hydroxide solution does not lead to the formation of pure lead hydroxide but tO an approximate Pb(NO3)2-3Pb(OH)2 composition [15]. In other words, not all the lead acts as an acid towards OHand hexaniobate species since some lead is precipitated with its nitrate counterion according to…”

Section: Titration Of the Niobium Solution With An Acidmentioning

confidence: 99%

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Synthesis of ferroelectric perovskites through aqueous-solution techniques

Guzmán

Aegerter²,

Barboux³

et al. 1993

J Mater Sci

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The hydrolysis of niobates in aqueous solutions has been applied to the coprecipitation of PbNb2/3Mgl/303 leading to a low temperature synthesis of this ferroelectric relaxor ceramic. The effect of hydrolysis conditions -such as the concentration of bases and acids used, their rates of addition and the nature of the precursors salts -is described. The perovskite phase appears after heating at 350~ and is obtained as a pure phase at 800~ after heat treatment for 1 h. Relaxor ferroelectric ceramics with a high dielectric constant can be obtained by sintering at 1000 ~ The process has been also applied to the synthesis of other relaxor ceramic compositions such as PZN (PbNb2/3Znl/303) and PFN (PbNbl/2Fel/203) compounds.

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Section: Preparation and Characterization Of The Solutionssupporting

confidence: 80%

Section: Titration Of the Niobium Solution With An Acidmentioning

confidence: 99%

Synthesis of ferroelectric perovskites through aqueous-solution techniques

Guzmán

Aegerter²,

Barboux³

et al. 1993

J Mater Sci

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“…An examination of the literature about lead nitrates reveals that several studies about basic lead nitrates have been carried out. − The speciation of lead–hydroxo moieties plays an important role in understanding the mechanism of transport of lead in aqueous systems. − The earlier studies for basic lead nitrates mainly focused on studying the resultant precipitates in the aqueous system Pb(NO 3 ) 2 –NaOH by using conductometric and potentiometric titrimetry coupled with chemical analysis and solubility-product determinations or powder X-ray diffraction methods, and some empirical formulas, such as Pb(NO 3 ) 2 ·Pb(OH) 2 , Pb(NO 3 ) 2 ·5PbOH) 2 , 2Pb(NO 3 ) 2 ·5Pb(OH) 2 , and Pb(NO 3 ) 2 ·3Pb(OH) 2 , were obtained. − Subsequently, studies about the category of basic salt phase in aqueous nitrate solutions with different pH values have been reported, and some crystal structures of basic lead nitrate have been successively reported. − Because of the fact that, in aqueous solutions, Pb 2+ cations usually form polynuclear complexes with Pb 2+ cations linked via bridging hydroxyl groups and/or oxygen atoms, various lead–(oxide, hydroxide) clusters have been discovered. ,− In these clusters, anions (O 2– or OH – ) play the role of the central atom. Generally, the O 2– anion is located at the center of a tetrahedron defined by Pb 2+ cations, thus forming (OPb 4 ) oxocentered tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

Series of Lead Oxide Hydroxide Nitrates Obtained by Adjusting the pH Values of the Reaction Systems

Wang

Luo

et al. 2014

Inorg. Chem.

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A series of lead(II) nitrates have been synthesized by a hydrothermal method and adjusting the pH values of the reaction systems. Pb20O6(OH)16(NO3)12 and Pb2O(OH)NO3, crystallize in the centrosymmetric space group P1̅ and Pbca, respectively. The structure of Pb20O6(OH)16(NO3)12 features infinite cationic chains of [Pb20O6(OH)16]∞ running along c axis, and the nitrate groups as the counterions reside between adjacent chains, while the structure of Pb2O(OH)NO3 can be described as alternate stacking of cationic [Pb2O(OH)]∞ layers with anionic [NO3](-) layers along [001] direction by the weak Pb-O bonds, forming a 3D framework with 1D tunnels of 12-member rings (MRs). [Pb4(OH)4](NO3)4, crystallizing in the noncentrosymmetric space group Cc, has been studied as the nonlinear optical material for the first time. The second harmonic generation (SHG) measurement indicates that the SHG responses of [Pb4(OH)4](NO3)4 are 0.7 times that of KDP. Theoretical calculations confirmed the SHG efficiency of [Pb4(OH)4](NO3)4 originates from the cooperative effect of NO3(-) groups and lead oxygen polyhedras in the structure. Meanwhile, the relationship between pH value and ratio of Pb/OH(-) in the molecules presents a positive correlation, which results in the diversity of these structures under different pH value.

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“…Esto refleja el resultado de la esterificación con ácido cítrico. Los picos de 3340 cm -1 confirma la existencia de cantidades elevadas de grupos carboxílicos -COOH (2500-3500 cm-1) en el estiramiento que se observa en la cáscara de yuca modificada con ácido cítrico [21,22]. El contenido de lignina en la cáscara de yuca modificada con ácido cítrico presentó un valor de 6.3 %, similar al valor encontrado en la literatura que fue de 6% [23].…”

Section: Caracterización De La Cáscaraunclassified

Remoción de plomo de soluciones acuosas usando cáscara de yuca modificada con ácido cítrico

Albis¹,

Martínez²,

Severiche³

et al. 2016

Avances

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En este trabajo se estudió la capacidad de adsorción de plomo usando cáscara de yuca modificada con ácido cítrico como medio adsorbente; se realizó la caracterización de la biomasa antes y después de la modificación y el análisis cinético del proceso de adsorción. Los factores experimentales que se estudiaron en el proceso de remoción de plomo fueron el tiempo y la temperatura de contacto de la cáscara de yuca con el ácido cítrico, el tiempo de secado después de la impregnación, la temperatura y tiempo de terminación de secado en horno y la relación biomasaacido (%p/p). Los resultados muestran que la biomasa fue esterificada exitosamente, lo que se tradujo en adsorciones del metal de hasta un 95% con tiempos de equilibrio entre 20 y 25 minutos. La cinética pudo ser ajustada al modelo de pseudo-segundo orden.

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Basic Salts of Lead Nitrate Formed in Aqueous Media¹

Cited by 27 publications

References 1 publication

Synthesis of ferroelectric perovskites through aqueous-solution techniques

Synthesis of ferroelectric perovskites through aqueous-solution techniques

Series of Lead Oxide Hydroxide Nitrates Obtained by Adjusting the pH Values of the Reaction Systems

Remoción de plomo de soluciones acuosas usando cáscara de yuca modificada con ácido cítrico

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Basic Salts of Lead Nitrate Formed in Aqueous Media1

Cited by 27 publications

References 1 publication

Synthesis of ferroelectric perovskites through aqueous-solution techniques

Synthesis of ferroelectric perovskites through aqueous-solution techniques

Series of Lead Oxide Hydroxide Nitrates Obtained by Adjusting the pH Values of the Reaction Systems

Remoción de plomo de soluciones acuosas usando cáscara de yuca modificada con ácido cítrico

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Basic Salts of Lead Nitrate Formed in Aqueous Media¹