Effects of low-molecular-weight organic acids on Cu(II) adsorption onto hydroxyapatite nanoparticles

Wang, Yujun; Chen, Jiehua; Yuxia, Cui; Wang, Shenqiang; Zhou, Dongmei

doi:10.1016/j.jhazmat.2008.06.001

Cited by 116 publications

(38 citation statements)

References 27 publications

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“…The high stability constant (lgb 1 ) value of Eu(III) with citrate makes Eu-Citrate the main speciation in aqueous, and more Eu-Citrate complexes will be created with the increasing initial citrate concentration which brings to the decrease of Eu(III) sorption on Na-bentonite. As reported, citrate also suppressed the sorption of Cu(II) [16] and rare earth elements (La, Ce, Pr and Nd) [39] on hydroxyapatite nanoparticles and four typical Chinese soils, respectively. Both of salicylate and phthalate have slight effects on Eu(III) sorption on Na-bentonite at two different concentration ratios.…”

Section: Effect Of Equilibration Time On Eu(iii) Sorption On Nabentonitesupporting

confidence: 68%

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Effects of organic acids on Eu(III) sorption on Na-bentonite

Guo

Yang

Zhang

et al. 2014

J Radioanal Nucl Chem

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Sorption of Eu(III) on Na-bentonite dispersed in sodium chloride media was studied as a function of pH via batch-type experiments. The sorption was found increased with the increasing pH. The sorption kinetics of Eu(III) on Na-bentonite in the absence and presence of different organic acids were described by pseudo-secondorder model at pH 6.0 ± 0.1. The effects of different types of organic acids on the sorption of Eu(III) to Na-bentonite were extensively investigated. It was found that the concentration ratio of Eu(III) to ligand is a critical factor to the effect of an organic acid on Eu(III) sorption.

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Section: Effect Of Equilibration Time On Eu(iii) Sorption On Nabentonitesupporting

confidence: 68%

“…The root of a plant will release some organic acids to complex with the heavy metal when it is intimated by heavy metals [16]. Acetic acid, citric acid, oxalic acid, salicylic acid are the typical representatives of root secreta, which may modify the retention of heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Effects of organic acids on Eu(III) sorption on Na-bentonite

Guo

Yang

Zhang

et al. 2014

J Radioanal Nucl Chem

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“…More recently, hydroxyapatite, has been proposed as a inexpensive but efficient adsorbent for removal/remediation of soils polluted by Pb (Hashimoto et al, 2009;Slobodan, 2009), Zn and Cd (Chen et al, 2007;Zhu et al, 2008) and Cu-, Znpolluted wastewater (Qian et al, 2008;Wang et al, 2009). Besides phosphates, activated carbons are considered also an efficient treatment for the removal of many organic compounds and metals from both liquid and gas phases (Cheung et al, 2002;Danny et al, 2004;Xiao and Thomas, 2004;Chen et al, 2006), but expensive.…”

mentioning

confidence: 99%

Adsorption of aqueous Cd2+, Pb2+, Cu2+ ions by nano-hydroxyapatite: Single- and multi-metal competitive adsorption study

Chen

et al. 2010

Geochem. J.

162

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Being an inexpensive but efficient adsorbent, hydroxyapatite is extensively used for decontaminating wastewater and soils polluted by heavy metals. However, its solubility and grain size can affect its remediation effectiveness. This study investigated the ability of nano-hydroxyapatite (nano-HAP) to adsorb aqueous Cd, Pb and Cu ions from single-metal and multi-metal ions reaction systems. Langmuir and Freundlich isotherm equations were employed to study the sorption constants. Based on the sum of squares errors (SSE), results showed that the Langmuir isotherm better fits sorption data than the Freundlich equation. The sorption affinity of nano-HAP for Pb(II) is always higher than that for Cu(II) and for Cd(II); the sorption maxima for the Cd, Pb and Cu follow the order Pb 2+ > Cu 2+ > Cd 2+ . This could be inversely proportional to the hydrated ionic radii as Pb 2+ (4.01 Å) > Cu 2+ (4.19 Å) > Cd 2+ (4.26 Å). The measured selectivity coefficients in multi-metal (Cd-Pb-Cu) reaction systems shows that Pb has the highest sorption selectivity on nano-HAP among the metals investigated. This sorption selectivity coincided well with the sorption affinity order in mono-metal reaction systems. The pH of the solution is an important parameter in controlling Cd, Pb and Cu ions sorption on nano-HAP. Indeed, the nano-HAP sorption capacity increases with increasing pH up to a value of 6.25. This implies that the removal of metals from the solution is recommended for pH ≈ 6.25 or below, during remediation using nano-HAP as a sorbent.

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“…Oxalic acid is commonly found in water and soil as a natural product of plant, and animal remains decomposition. According to the recent investigations, organic acids change significantly bioavailability of heavy metals in soil and can affect phytoremediation effectiveness [1].…”

Section: Introductionmentioning

confidence: 99%

“…Due to specific composition, crystalline structure and adsorption properties of hydroxyapatite, a new possibility appears for its application in separation of organic acids [2] and also understanding the effect of oxalic acid influence on removal of different environment contaminants [1,3]. Therefore, more and more attention is paid to the studies of organic acids effect on hydroxyapatite, and there can be found a few papers devoted to adsorption of oxalic acid on hydroxyapatite.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of hydroxyapatite with adsorbed oxalic acid

Skwarek

2015

J Therm Anal Calorim

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The specific adsorption of oxalic acid ions at the hydroxyapatite interface was investigated by means of the radioisotope method ( 14 C) as a function of oxalic acid ions concentration, NaCl concentration and pH. Application of hydroxyapatite has become extensive in the biomaterial field due to its biocompatibility with human hard tissue. Hydroxyapatite was synthesized using wet methods. Physical properties of the resulting powder were characterized by DTA/TG, XRD, AFM and SEM microscopy. Physicochemical properties characterizing the electrical double layer of the hydroxyapatite/NaCl solution interface were determined. The zeta potential and the adsorption of oxalic acid molecules were studied as a function of pH. The point of zero charge and the isoelectric point of samples were determined: its values are as follows: pH PZC = 7 and pH IEP = 4. Temperature has insignificant influence on pure substance and with oxalic acid adsorbed, as thermal analysis has shown, and characterization of hydroxyapatite structure can be carried out by this thermal analysis. Two phenomena are responsible for oxalic acid adsorption: phosphate group replacement at the hydroxyapatite surface by oxalic ions simultaneous to intraspherical complexes formation.

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Effects of low-molecular-weight organic acids on Cu(II) adsorption onto hydroxyapatite nanoparticles

Cited by 116 publications

References 27 publications

Effects of organic acids on Eu(III) sorption on Na-bentonite

Effects of organic acids on Eu(III) sorption on Na-bentonite

Adsorption of aqueous Cd2+, Pb2+, Cu2+ ions by nano-hydroxyapatite: Single- and multi-metal competitive adsorption study

Thermal analysis of hydroxyapatite with adsorbed oxalic acid

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