Removal of cadmium(II) and lead(II) from aqueous solution using sulfur-functionalized silica prepared by hydrothermal-assisted grafting method

Fan, Hong-Tao; Wu, Jin-Bao; Fan, X. H.; Zhang, Dongsheng; Su, Zi-Jie; Yan, Feng; Sun, Ting

doi:10.1016/j.cej.2012.05.109

Cited by 84 publications

(14 citation statements)

References 43 publications

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“…Bifunctional materials, characterized by better developed surface, as well as the presence of the methyl or n -propyl groups, partially prevent the oxidation of 3-mercaptopropyl groups. Cadmium (II) ions can interact both 3-mercaptopropyl groups and disulfide bridges 42 , so Me/Lig ratio is close to 1/1. Presence of only part of available 3-mercaptopropyl groups were also confirmed by the results of adsorption of Pb(II) ions (Table 2 and Fig.…”

Section: Resultsmentioning

confidence: 99%

Protection of Thiol Groups on the Surface of Magnetic Adsorbents and Their Application for Wastewater Treatment

Melnyk

Pogorilyi

Zub

et al. 2018

Sci Rep

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The magnetite nanoparticles were functionalized with silica shells bearing mercaptopropyl (monofunctional) and mercaptopropyl-and-alkyl groups (bifunctional) by single-step sol-gel technique. The influence of synthetic conditions leading to increased amounts of active functional groups on the surface and improved capacity in the uptake of Ag(I), Cd(II), Hg(II), and Pb(II) cations was revealed. The physicochemical properties of obtained magnetic nanocomposites were investigated by FTIR, Raman, XRD, TEM, SEM, low-temperature nitrogen ad-/desorption measurements, TGA, and chemical microanalysis highlighting the efficiency of functionalization and mechanisms of the preparation procedures. The removal of the main group of heavy metal cations was studied in dependence from the pH, contact time and equilibrium concentration to analyze the complexes composition for the large scale production of improved adsorbents. It was demonstrated that introduction of the alkyl groups into the surface layer prevents the formation of the disulfide bonds between adjacent thiol groups. The obtained adsorbents were employed to treat real wastewater from Ruskov, Slovakia with concentration of Fe 319 ng/cm3, Cu 23.7 ng/cm3, Zn 36 ng/cm3, Mn 503 ng/cm3, Al 21 ng/cm3, As 34 ng/cm3, Pb 5.8 ng/cm3, Ni 35 ng/cm3, Co 4.2 ng/cm3, Cr 9.4 ng/cm3, Sb 6 ng/cm3, Cd 5 ng/cm3. These materials proved to be highly effective in the removal of 50% of all metal ions, espeсially Zn, Cd, and Pb ions from it and turned recyclable, opening for their sustainable use in water purification.

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Section: Resultsmentioning

confidence: 99%

Protection of Thiol Groups on the Surface of Magnetic Adsorbents and Their Application for Wastewater Treatment

Melnyk

Pogorilyi

Zub

et al. 2018

Sci Rep

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“…Table 3 lists the heavy metal adsorption capacities of PVA/PAA gel and some commonly used adsorbents such as alginate gel beads, sulfur-functionalized silica, birnessite, chitosan nanofibrils, etc. [21][22][23][24][25][26][27][28]. Although a direct comparison of PVA/PAA gel with other adsorbents is difficult due to the different experimental conditions applied, it is still found that the gel sorption capacities of Pb(II) and Cd(II) over PVA/PAA are comparatively high.…”

Section: Effect Of Temperature and Initial Concentrationmentioning

confidence: 97%

A double network gel as low cost and easy recycle adsorbent: Highly efficient removal of Cd(II) and Pb(II) pollutants from wastewater

Chu

Liu

Zhou

et al. 2015

Journal of Hazardous Materials

150

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“…In recent years, environmental pollution by heavy metals, especially some toxic metals, has been a fascinating issue for scientists due to the increased leakage, toxicity, inconsistency in nature and other fatal effects [1]. One of the main trace elements is lead (Pb), because of its high toxicity even at very low values [2,3].…”

Section: Introductionmentioning

confidence: 99%

NiFe2O4 coated sand as a nano-adsorbent for removal of Pb (II) from aqueous solutions

Asl

Mohseni‐Shahri

Moeinpour

2019

Eurasian Chem. Commun.

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In this study, NiFe2O4 magnetic nanoparticles as an adsorbent for lead (Pb) removal were coated on sand particles. Adsorption studies were conducted to investigate the efficacy of contact time, pH, adsorbent dosage and initial lead ion concentration on the removal efficiency. To choose the most fitting kinetic model, the pseudo-first order and pseudo-second order models were compared and the most suitable kinetic model was selected by the pseudo-second order. Langmuir and Freundlich isotherms were evaluated and the most suitable isotherm was observed as the Freundlich model. In addition, the NiFe2O4 coated sand can simply be removed by an ordinary filtration process.

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Removal of cadmium(II) and lead(II) from aqueous solution using sulfur-functionalized silica prepared by hydrothermal-assisted grafting method

Cited by 84 publications

References 43 publications

Protection of Thiol Groups on the Surface of Magnetic Adsorbents and Their Application for Wastewater Treatment

Protection of Thiol Groups on the Surface of Magnetic Adsorbents and Their Application for Wastewater Treatment

A double network gel as low cost and easy recycle adsorbent: Highly efficient removal of Cd(II) and Pb(II) pollutants from wastewater

NiFe2O4 coated sand as a nano-adsorbent for removal of Pb (II) from aqueous solutions

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