Adjusted pH for the Selective Separation of Cadmium from Lead by Nano-Active Silica-Functionalized-[Bmim+Tf2N−] Ionic Liquid

Mahmoud, Mohamed E.; Albishri, Hassan M.

doi:10.1080/01496395.2012.710886

Cited by 19 publications

(3 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several separation methods such as precipitation, membrane processes, adsorption based on activated carbons, solid phase extraction, and use of chelating exchangers − are available for the removal of heavy-metal ions from aqueous solutions. Further, an extensive literature is also available on modifying the surface of silica with organic-based absorbent materials utilized for the removal of lead, ,, copper, mercury, and cadmium, − …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Novel Hybrid Material Titanium Amino Tris(methylenephosphonic acid) and Its Application as a Cation Exchanger

Shah

Chudasama

2014

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In the present work, a novel hybrid ion-exchange material was synthesized by a sol−gel route, by treating titanium tetrachloride with claw-type amino tris(methylenephosphonic acid) (ATMP) to give titanium amino tris(methylenephosphonic acid) (Ti-ATMP). Ti-ATMP was characterized by elemental analysis (ICP-AES and C, H, N analysis), spectral analysis (FTIR), thermal analysis (TGA), XRD, SEM, and EDX spectroscopy, including physicochemical and ion-exchange characteristics. The equilibrium exchange of transition-metal ions (viz., Cu 2+ , Ni 2+ , Co 2+ Zn 2+ ) and heavy-metal ions (viz., Pb 2+ ,Cd 2+ , Hg 2+ ) with the H + ions contained in ATMP was studied at constant ionic strength and varying temperatures, and various thermodynamic parameters such as the equilibrium constant (K), standard Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were evaluated. The Nernst−Planck equation was used to study the ion-exchange kinetics, and various kinetic parameters, namely, the self-diffusion coefficient (D 0 ), energy of activation (E a ), and entropy of activation (ΔS*), were evaluated under conditions favoring a particle-diffusion-controlled mechanism. Metal-ion adsorptions with variations in concentration and temperature were studied using the Langmuir and Freundlich adsorption isotherms. The distribution coefficient (K d ) and breakthrough capacity (BTC) values for transition-and heavy-metal ions were determined. Based on K d (mL•g −1 ), the selectivity order for metal ions toward Ti-ATMP was found to be Cu 2+ (19820) > Zn 2+ (3280) > Co 2+ (2630) > Ni 2+ (2390) among transition-metal ions and Pb 2+ (3590) > Cd 2+ (2340) > Hg 2+ (610) among the heavy-metal ions. The elution behavior of these metal ions was studied using different acids and electrolytes. A study on regeneration and reuse of the ion exchanger Ti-ATMP shows that it is effective up to five cycles without much decline in performance, which indicates that Ti-ATMP has good potential for use as a cation exchanger.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Novel Hybrid Material Titanium Amino Tris(methylenephosphonic acid) and Its Application as a Cation Exchanger

Shah

Chudasama

2014

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The efficiency of Cd(II) uptake by Sfm, Sulf-Sfm, and Nit-Sfm adsorbents in the presence of various shaking times (1.0−60.0 min) was found to slowly proceed via two steps mechanism. 41,42 The first step involves a gradual increase in the percentage extraction and removal values of Cd(II) onto adsorbents' surface. With the gradual occupancy of the surface active sites, the adsorption process becomes less efficient, and an equilibrium condition is obtained which is mainly based on the complete saturation (∼100%) of the adsorbent surface by the target metal ion.…”

Section: T H I S C O N T E N T Imentioning

confidence: 99%

Conversion of Waste Styrofoam into Engineered Adsorbents for Efficient Removal of Cadmium, Lead and Mercury from Water

Mahmoud

Abdou

Ahmed

2015

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Recycling waste Styrofoam to new useful materials is essential to both the environment and humans. In this paper, waste Styrofoam (Sfm) was chemically converted via nitration and sulfonation procedures to the corresponding nitrated (Nit-Sfm) and sulfonated (Sulf-Sfm) derivatives for further use as potential cation exchangers. The proposed method is aimed to proceed via surface chemical modification without changing the core of the Styrofoam material. The degrees of incorporated cation exchange properties of Nit-Sfm and Sulf-Sfm adsorbents were determined and found to correspond to 8.2 and 10.6 mmol g −1 , respectively. The potential applications of Nit-Sfm and Sulf-Sfm as efficient adsorbents for the removal of Cd(II), Pb(II), and Hg(II) from aqueous solutions were explored in the presence of various experimental controlling factors using the batch equilibrium technique. The optimum pH for removal of Hg(II) was 4.0 and for Cd(II) and Pb(II) was 7.0, and the optimum contact time for complete removal of the evaluated metal ions was found in the range of 20−30 min. The maximum uptake capacity values of Hg(II), Pb(II), and Cd(II) were characterized in the ranges of 1950−2450 (pH 4.0), 750−1100 (pH 7.0), and 450−600 (pH 7.0) μmol g −1 , respectively. The feasibility of using Nit-Sfm and Sulf-Sfm as packing materials in a multistage microcolumn technique for removal of Cd(II), Pb(II), and Hg(II) from industrial and drinking tap water samples was also explored, and excellent results were obtained as 80.0−90.2, 81.0−90.6, and 90.1−100.0 ± 0.5−3.0%, respectively.

show abstract

“…Ionic liquids (ILs) are a family of organic salts being composed of organic cations and inorganic or organic anions. Due to their unique properties, such as negligible volatility, low flammability, low melting point (<100 °C), and high thermal stability, ILs have been widely used as alternative for conventional organic solvents in the extraction of metal ions from aqueous solutions. − For the systems of solvent extraction of neodymium and samarium with ILs, Kikuchi et al investigated the extraction of neodymium derived from NdFeB magnets from aqueous solution by tri- n -butyl phosphate (TBP) in the IL tricaprylmethylammonium nitrate [A336][NO 3 ]. Nakashima et al studied the extraction of neodymium and samarium from aqueous HNO 3 solution by the mixture of 1-butyl-3-methylimidizolium hexafluorophosphate ([C 4 mim][PF 6 ]) with octyl(phenyl)- N , N -diisobutylcarbamoylmethyl phosphine oxide (CMPO).…”

Section: Introductionmentioning

confidence: 99%

pH-Controlled Selective Separation of Neodymium (III) and Samarium (III) from Transition Metals with Carboxyl-Functionalized Ionic Liquids

Chen¹,

Wang²,

Pei³

et al. 2015

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The recovery of rare-earth metals from waste materials is very important due to the risks associated with having a low supply of them in the future. In this work, hydrophobic 1alkylcarboxylic acid-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids, [(CH 2 ) n COOHmin][Tf 2 N] (n = 3, 5, 7), were synthesized and used to separate neodymium (III) from Fe(III) and samarium (III) from Co(II) in aqueous solutions. The factors affecting the solvent extraction process such as phase volume ratio, contact time, pH value of the aqueous phase, alkyl chain length of the ionic liquids, and temperature of the system were examined systematically. It was found that the maxmium extraction efficiency of the investigated metal ions was as high as 99%, and Sm(III) and Nd(III) could be selectively separated from Co(II) and Fe(III), with separation factors of 10 4 −10 5 , by simply modulation of the aqueous phase pH. After extraction, about 97% of the metal ions could be stripped from ionic liquid phase in a single stripping step by using dilute aqueous HCl or oxalic acid, and the ionic liquids would be recovered and reused in the next extraction process. These results indicate that the ionic liquids developed here are useful for the selective recovery of rare-earth metals from NdFeB and SmCo permanent magnets.

show abstract

Adjusted pH for the Selective Separation of Cadmium from Lead by Nano-Active Silica-Functionalized-[Bmim⁺Tf₂N⁻] Ionic Liquid

Cited by 19 publications

References 34 publications

Synthesis and Characterization of a Novel Hybrid Material Titanium Amino Tris(methylenephosphonic acid) and Its Application as a Cation Exchanger

Synthesis and Characterization of a Novel Hybrid Material Titanium Amino Tris(methylenephosphonic acid) and Its Application as a Cation Exchanger

Conversion of Waste Styrofoam into Engineered Adsorbents for Efficient Removal of Cadmium, Lead and Mercury from Water

pH-Controlled Selective Separation of Neodymium (III) and Samarium (III) from Transition Metals with Carboxyl-Functionalized Ionic Liquids

Contact Info

Product

Resources

About