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

Chen, S. B.; Ma, Yibing; Chen, L.; Xian, Kan

doi:10.2343/geochemj.1.0065

Cited by 162 publications

(88 citation statements)

References 19 publications

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“…(ionic radius 0.74 Å ) [22] with bigger Pb 2? (ionic radius 1.01-1.40 Å ) [24] ions. In general, it is assumed that when a cation is replaced by other larger, the result is an expansion of the lattice and therefore both the interplanar d-spacing increases and the 2h is shifted to lower angle.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Effects of Pb2+ ions concentration on the structure and PL intensity of Pb-doped ZnAl2O4 nanocrystals synthesized using sol–gel process

Motloung

Dejene

Swart

et al. 2014

J Sol-Gel Sci Technol

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Undoped and Pb 2? -doped ultrafine cubic zinc aluminate (ZnAl 2 O 4 ) hosts were successfully prepared at a relatively low temperature (*80°C) using the sol-gel method. The concentration of Pb 2? was varied from 0 to 5 mol%. The TGA showed that the minimum annealing temperature required to obtain single phase ZnAl 2 O 4 must be above 400°C. The XRD data revealed that all the annealed samples were single phase crystalline structures and the estimated crystallites size were in the range of 21-30 nm in diameter. The FTIR results suggest that heattreating can destroy some of the bonds. The surface morphology of the phosphors was influenced by the Pb 2? mol%. Undoped and Pb 2? -doped ZnAl 2 O 4 nanoparticles exhibit the violet emission at slightly different positions. The slight peak shifts suggests the possibilities that the luminescence centre can either be due to the defects level in the host or Pb 2? ions. The emission peaks at 390 and 399 nm are ascribed to the typical UV transitions 3 P 0,1 ? 1 S 0 in Pb 2? ion. At the higher Pb 2? mol%, the luminescence quenching behaviour occurs, which suggests that doping with Pb 2? ions is accompanied by the introduction of new defect sites that enhance non-radiative recombination of the excited electrons.

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Section: X-ray Diffractionmentioning

confidence: 99%

Effects of Pb2+ ions concentration on the structure and PL intensity of Pb-doped ZnAl2O4 nanocrystals synthesized using sol–gel process

Motloung

Dejene

Swart

et al. 2014

J Sol-Gel Sci Technol

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“…These minerals have commonly been suggested to be main solids limiting the dissolved forms of several metals in natural systems (e.g. Chen et al 2010). Notably, hydroxyapatite, which is a natural calcium phosphate mineral within the apatite group, may be an important solid for sorption in our study region.…”

Section: Metals Exhibiting No Correlation Between Predictions and Meamentioning

confidence: 99%

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

et al. 2016

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The speciation of metals in aqueous systems is central to understanding their mobility, bioavailability, toxicity and fate. Although several geochemical speciation models exist for metals, the equilibrium conditions assumed by many of them may not prevail in field-scale hydrological systems with flowing water. Furthermore, the dominant processes and/or process rates in non-acidic systems might differ from well-studied acidic systems. We here aim to increase knowledge on geochemical processes controlling speciation and transport of metals under nonacidic river conditions. Specifically, we evaluate the predictive capacity of a speciation model to novel measurements of multiple metals and their partitioning, under highpH conditions in mining zones within the Lake Baikal basin. The mining zones are potential hotspots for increasing metal loads to downstream river systems. Metals released from such upstream regions may be transported all the way to Lake Baikal, where increasing metal contamination of sediments and biota has been reported. Our results show clear agreement between speciation predictions and field measurements of Fe, V, Pb and Zn, suggesting that the partitioning of these metals mainly was governed by equilibrium geochemistry under the studied conditions. Systematic over-predictions of dissolved Cr, Cu and Mo by the model were observed, which might be corrected by improving the adsorption database for hydroxyapatite because that mineral likely controls the solubility of these metals. Additionally, metal complexation by dissolved organic matter is a key parameter that needs continued monitoring in the Lake Baikal basin because dependable predictions could not be made without considering its variability. Finally, our investigation indicates that further model development is needed for accurate As speciation predictions under non-acidic conditions, which is crucial for improved health risk assessments on this contaminant.

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“…The desorption studies indicated that most of the heavy metals desorbed at pH 2. Chen et al 39 carried out an investigation on competitive adsorption of many metals. Their investigation was focused on the heavy metals such as lead, cadmium and copper .They used nano-hydroxyapatite in single-and multi-metal competitive adsorption study.…”

Section: Multicomponent and Competitive Sorption Of Heavy Metalsmentioning

confidence: 99%

Multicomponent and Competitive Sorption of Heavy Metals- Review on Significant Research and Studies

2017

JCBSC

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Heavy metals have acute and chronic effect on human beings and other living organisms also. It is very important to identify the risk and take steps for removal of heavy metals from the effluents. The industries such as paint, pigment, catalyst, fine chemicals, coating, automobile, electronics, battery etc. uses heavy metals in some or other form. They treat the wastewater by using conventional methods. Heavy metal removal from the wastewater by using adsorption is commonly investigated area of research. The wastewater generally contains more than heavy metals. It is envisaged to study the effect of presence of one heavy metal on removal of other heavy metal. It can help selective removal of specific heavy metal and selection proper adsorbent. Most of these investigations indicated that the presence of one metal has significant effect on sorption of other metal. This effect can be positive or negative. Competitive adsorption indicates competition for adsorbent sites. In cooperative mechanism, the presence of one metal has positive effect on sorption of other. The present review intends to study research and studies on the competitive adsorption of heavy metals on different materials.

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

Cited by 162 publications

References 19 publications

Effects of Pb2+ ions concentration on the structure and PL intensity of Pb-doped ZnAl2O4 nanocrystals synthesized using sol–gel process

Effects of Pb2+ ions concentration on the structure and PL intensity of Pb-doped ZnAl2O4 nanocrystals synthesized using sol–gel process

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

Multicomponent and Competitive Sorption of Heavy Metals- Review on Significant Research and Studies

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