scholarly journals Adsorption of Pb (II) Ions onto Hydroxyapatite Nanopowders in Aqueous Solutions

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2204 ◽  
Author(s):  
Simona Iconaru ◽  
Mikael Motelica-Heino ◽  
Regis Guegan ◽  
Mircea Beuran ◽  
Adrian Costescu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Lead Ions ◽  
Precipitation Method ◽  
Hydroxyl Groups ◽  
Equilibrium Studies ◽  
Transmission Microscopy ◽  
Structure Information ◽  
Living Organisms ◽  
Co Precipitation

Contamination of water with heavy metals such as lead is a major worldwide problem because they affect the physiological functions of living organisms, cause cancer, and damage the immune system. Hydroxyapatite, (Ca5(PO4)3OH) is considered one of the most effective materials for removing heavy metals from contaminated water. The hydroxyapatite nanopowders (N-HAp) obtained by a co-precipitation method were used in this research to determine the effectiveness in removing lead ions from contaminated solutions. In this study, we have investigated the structure and morphology of N-HAp nanopowders using X-ray diffraction (XRD), electronic transmission microscopy (TEM), and scanning electron microscopy (SEM). The structure information was also obtained by spectroscopy measurements. The Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy measurements revealed the presence of peaks corresponding to the phosphate and hydroxyl groups. The ability of N-HAp nanopowders to adsorb lead ions from aqueous solutions were established. The results of the kinetic and equilibrium studies on the removal of Pb (II) from aqueous solution revealed that the adsorption of lead (II) cations is due to the surface reaction with the hydroxyl terminal groups on the adsorbent and the combination of the positive charges of the metal cations with the negative charges on the adsorbent surfaces. These observations could validate the use of these ceramic nanopowders in ecological remediation strategies.

Synthesis and Characterization of Regular Hexagonal NiCo2O4 Nanosheets

2007 ◽  
Vol 336-338 ◽  
pp. 2027-2029 ◽  
Author(s):  
Jun Yang ◽  
Jian Bao Li ◽  
Hong Lin ◽  
Xiao Zhan Yang ◽  
Ning Wang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Morphology And Structure ◽  
Naoh Solution ◽  
Co Precipitation ◽  
Nico2o4 Nanosheets ◽  
Spinel Nico2o4

In this article, the spinel NiCo2O4 nanosheets with diameters of 100-200 nm were prepared by calcinations of co-precipitates, which were obtained by co-precipitation method. Different kinds of precipitants, including NaOH, KOH, Na2CO3 and ethanedioic acid aqueous solutions were investigated, and regular hexagonal nanosheets are synthesized only when the precipitant is strong KOH or NaOH solution. The morphology and structure of the hexagonal precursor particles and nanosheets were investigated, and the mechanism of the formation of hexagonal nanosheets is discussed.

Modification of Fe3O4 superparamagnetic nanoparticles with zirconium oxide; preparation, characterization and its application toward fluoride removal

RSC Advances ◽  
2015 ◽  
Vol 5 (88) ◽  
pp. 72058-72068 ◽  
Author(s):  
F. Riahi ◽  
M. Bagherzadeh ◽  
Z. Hadizadeh
Keyword(s):  
Aqueous Solutions ◽  
Zirconium Oxide ◽  
Superparamagnetic Nanoparticles ◽  
Precipitation Method ◽  
Fluoride Removal ◽  
Co Precipitation

Fe3O4 superparamagnetic nanoparticles (NPs) modified with zirconia (ZrO2) were synthesized (Fe3O4@ZrO2) using a chemical co-precipitation method and used as a nanoadsorbent in the removal of excessive fluoride from aqueous solutions.

Kinetic and equilibrium studies in removing lead ions from aqueous solutions by natural sepiolite

2004 ◽  
Vol 112 (1-2) ◽  
pp. 115-122 ◽  
Author(s):  
Nihal Bektaş ◽  
Burcu Akman Ağım ◽  
Serdar Kara
Keyword(s):  
Aqueous Solutions ◽  
Lead Ions ◽  
Equilibrium Studies

Recycling of Steel Industry Waste Acid in the Preparation of Fe3O4 Nanocomposite for Heavy Metals Remediation from Wastewater

2021 ◽  
Vol 71 (12) ◽  
pp. 34-46
Author(s):  
Nagy A. E. Emara ◽  
Rehab M. Amin ◽  
Ahmed F Youssef ◽  
Souad A. Elfeky
Keyword(s):  
Heavy Metals ◽  
Magnetic Nanoparticles ◽  
Field Application ◽  
Precipitation Method ◽  
Industry Waste ◽  
Field Samples ◽  
Pickling Process ◽  
Co Precipitation ◽  
The Cost ◽  
Waste Acid

This study was steered to convert waste acid ensued from the pickling process in steel industries to an esteemed nanocomposite for the elimination of heavy metals (HMs) from wastewater. Magnetic nanoparticles (Fe3O4) preparation from waste was performed by the co-precipitation method. These magnetic nanoparticles are modified by carboxymethyl-a-cyclodextrin polymer (CM-a-CD) through copolymerization reactions. The data obtained from FTIR, XRD, and TEM point up that CM-a-CD is entrenched onto Fe3O4 nanoparticles. The generated CM-a-CD / Fe3O4 was employed for HMs deportation from contaminated water and the adsorption results revealed that CM-a-CD/ Fe3O4 sorption efficiency was in the order of Pb(II) ] Cd(II) ] Cr(VI). The highest adsorption capacity was 64.2 (mg/g) for Pb(II). The kinetic study revealed that the HMs sorption by CM-a-CD/ Fe3O4 follows the pseudo-second-order model. The equilibrium modeling study proved that the Langmuir isotherm model was more fitting. The coexisting ions do not significantly alter the percentage removal of the measured metal ions. The efficiency of the synthesized polymer is particularly high in the tested field samples. Thus, CM-a-CD/ Fe3O4 has an extremely high adsorption capability in the field application as well as excellent reusability results, which will reduce the cost for the CM-a-CD / Fe3O4 as an adsorbent for wastewater treatment.

scholarly journals Selective nitrate removal from aqueous solutions by a hydrotalcite-like absorbent FeMgMn-LDH

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hongguang Zhou ◽  
Youlin Tan ◽  
Wei Gao ◽  
Yue Zhang ◽  
Yanmei Yang
Keyword(s):  
Aqueous Solutions ◽  
Environmental Remediation ◽  
Removal Rate ◽  
Nitrate Removal ◽  
Precipitation Method ◽  
Adsorption Mechanisms ◽  
Nitrate Ions ◽  
Sieve Effect ◽  
Nitrate Adsorption ◽  
Co Precipitation

Abstract FeMgMn-LDH, a type of potential environmental remediation material, has been synthesized via a co-precipitation method, and its adsorption characteristics for nitrate were investigated in this study. It’s shown that the prepared FeMgMn-LDH is a promising adsorbent for anions removal, which has high buffer capacity (final pH remained between 9 and 10) and high reversibility, and can remove nitrate ions selectively though an anion-sieve effect. The maximum amount of nitrate adsorption is 10.56 N-mg g−1 at 25 ℃. The removal rate of nitrate ions can reach 86.26% with the adsorbent dose of 5 g/L in a real water. The competition order of coexisting anions on nitrate adsorption by FeMgMn-LDH is CO32− > PO43− > SO42−. The negative values of ΔG0 (from − 27.796 to − 26.426 kJ mol−1) and ΔH0 (− 6.678 kJ mol−1) indicate that the nitrate adsorption process on the FeMgMn-LDH is spontaneous and exothermic. The main adsorption mechanisms of nitrate removal from aqueous solutions by FeMgMn-LDH are electrostatic attraction and ion exchange.

scholarly journals Novel nanostructured Fe–Cu–Al trimetal oxide for enhanced antimony(V) removal: synthesis, characterization and performance

2019 ◽  
Vol 79 (10) ◽  
pp. 1995-2004
Author(s):  
Jianyan Wang ◽  
Jing Chen ◽  
Qiumei Li ◽  
Gaosheng Zhang
Keyword(s):  
Toxic Metal ◽  
Point Of Zero Charge ◽  
Precipitation Method ◽  
Hydroxyl Groups ◽  
Adverse Health Effects ◽  
Ion Exchange Reaction ◽  
Wide Ph Range ◽  
And Performance ◽  
Ph Range ◽  
Co Precipitation

Abstract Given the adverse health effects of antimony (Sb), there is an increased focus on developing methods to remove this toxic metal from contaminated water bodies. To effectively remove Sb(V), a new nanostructured Fe–Cu–Al trimetal oxide was fabricated using co-precipitation method at ambient temperature. The Fe–Cu–Al trimetal oxide was very effective at removing Sb(V) from water; it had a maximal adsorption capacity of 169.1 mg/g at pH 7.0, a capacity that was competitive with most other reported adsorbents. The obtained amorphous oxide had a high pH point of zero charge (pHpzc = 8.8) and good adsorption Sb(V) efficiency over a wide pH range (4.0–8.0). Sb(V) uptake was achieved mainly through an ion-exchange reaction between Sb(V) ions and hydroxyl groups on the surface of the oxide. Given its good removal performance, high selectivity, and simple synthesis, this novel Fe–Cu–Al trimetal oxide offers a promising alternate for removing antimony contamination from aquatic environments.

scholarly journals Preparation and characterization of magnetic graphene oxide nanocomposite (GO-Fe3O4) for removal of strontium and cesium from aqueous solutions

2021 ◽  
Vol 4 (1) ◽  
pp. 26
Author(s):  
Sule Aytas ◽  
Sabriye Yusan ◽  
Senol Sert ◽  
Cem Gok
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Precipitation Method ◽  
Magnetic Graphene Oxide ◽  
X Ray ◽  
Magnetic Graphene ◽  
Transmission Electron ◽  
Co Precipitation

Magnetic graphene oxide nanocomposites (M-GO) were successfully synthesized by partial reduction co-precipitation method and used for removal of Sr(II) and Cs(I) ions from aqueous solutions. The structures and properties of the M-GO was investigated by X-ray diffraction, Fourier transformed infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometer (VSM) and N2-BET measurements. It is found that M-GO has 2.103 mg/g and 142.070 mg/g adsorption capacities for Sr(II) and Cs(I) ions, respectively. The adsorption isotherm matches well with the Freundlich for Sr(II) and Dubinin–Radushkevich model for Cs(I) and kinetic analysis suggests that the adsorption process is pseudo-second-ordered.

scholarly journals Removal of Some Heavy Metals [Pb(II), Cd(II), Zn(II)] in Polluted Waters using Acid- Functionalized MCM-41 Mesoporous Materials: Adsorption Isotherm and Kinetic Studies

2021 ◽  
Vol 33 (12) ◽  
pp. 2934-2942
Author(s):  
Jayarangarao Prathipati ◽  
Paul Douglas Sanasi
Keyword(s):  
Heavy Metals ◽  
Adsorption Isotherm ◽  
Surface Area ◽  
Kinetic Studies ◽  
Sulphonic Acid ◽  
Bet Surface Area ◽  
Precipitation Method ◽  
Functionalized Mesoporous Silica ◽  
Co Precipitation ◽  
Mcm 41

Acid functionalized mesoporous silica materials like sulphonic acid (SO3HMCM-41) and phosphotungstic acid (PWMCM-41) were synthesized by a simple co-precipitation method. These materials were characterized using XRD, SEM-EDS, FT-IR, BET surface area techniques. The mesoporosity was retained even after acid functionalization into MCM-41. There was a significant fall in the surface area (SBET, m2 g-1), on incorporation of sulphonic acid (-SO3H) and phosphorous, tungsten atoms into the MCM-41 material. SO3HMCM-41 was found to be more acidic than PWMCM-41 and MCM-41. Their performance was evaluated by conducting experiments on the removal of heavy metals like Pb(II), Cd(II), Zn(II) present in industrial wastewaters, with atomic absorption spectrophotometer (AAS). The required experimental factors were analyzed and it was observed that the removal of metals was more efficient with the acid-functionalized materials than with MCM-41. Freundlich adsorption isotherm and pseudo-first order kinetics have confirmed the validity of the results.

scholarly journals DETERMINATION OF COPPER, ZINC, CADMIUM AND LEAD IN WATER USING CO-PRECIPITATION METHOD AND RAMAN SPECTROSCOPY

2013 ◽  
Vol 06 (03) ◽  
pp. 1350021 ◽  
Author(s):  
YANDE LIU ◽  
YU SHI ◽  
LIJUN CAI ◽  
YONG HAO ◽  
CHUNJIANG ZHAO
Keyword(s):  
Heavy Metals ◽  
Raman Spectroscopy ◽  
Precipitation Method ◽  
Least Squares Regression ◽  
Precipitation Procedure ◽  
Calibration Methods ◽  
Zinc Cadmium ◽  
Copper Zinc ◽  
Co Precipitation ◽  
Cadmium And Lead

Mn co-precipitation method combined with Raman spectroscopy were used to determine trace heavy metals (copper, zinc, cadmium and lead) in water sample. Different concentrations of heavy metals including copper, zinc, cadmium and lead in water samples were separated and enriched by Mn 2+-phen-SCN- ternary complex co-precipitation procedure. The Raman spectra of co-precipitation sediments were collected using confocal micro-Raman spectrometry. Different preprocessing treatments and regression calibration methods were compared. The best models using partial least squares regression (PLS) of copper, zinc, cadmium and lead were built with a correlation coefficient of prediction (Rp) of 0.979, 0.964, 0.956 and 0.972, respectively, and the root mean square error of prediction (RMSEP) of 6.587, 9.046, 9.998 and 7.751 μg/kg, respectively. The co-precipitation procedure combined with Raman spectroscopy method are feasible to detect the amount of heavy metals in water.

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