Modified SBA-15 mesoporous silica for heavy metal ions remediation

Mureşeanu, Mihaela; Reiss, Aurora; Ștefănescu, Ioan; David, Elena; Pârvulescu, Viorica; Renard, Gilbert; Hulea, Vasile

doi:10.1016/j.chemosphere.2008.07.039

Cited by 256 publications

(147 citation statements)

References 42 publications

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“…These peaks suggested successful reaction between the hydroxyl groups on the silica framework and the ethoxy groups of the amino-propyl-tri-ethoxy-silane substrate. The peaks observed between 2800 and 3000 cm À1 were attributed to both symmetric and asymmetric stretching vibrations of the eCH 3 and eCH 2 groups of the APS (Mureseanu et al, 2008). On functionalization with the tripolyphosphate, the intensity of the peak around 1070 cm À1 increased and a new peak appeared at 953 cm…”

Section: Synthesis and Characterization Of The Sba-15 Sorbentsmentioning

confidence: 91%

Microscale scavenging of pentachlorophenol in water using amine and tripolyphosphate-grafted SBA-15 silica: Batch and modeling studies

Diagboya

Olu-Owolabi

Adebowale

2014

Journal of Environmental Management

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a b s t r a c tMesoporous silica SBA-15 meets most criteria for selection of water treatment adsorbents such as high specific surface area, large pore-size, chemical inertness, repertory of surface functional groups, good thermal stability, selectivity, regenerability, and low cost of manufacture. However, its use for water treatment is still largely unexplored. SBA-15 and its functionalized derivatives of aminopropyltriethoxysilane (SA) and tripolyphosphate (ST) were synthesized, characterized, and used to investigate pentachlorophenol (PCP) removal from aqueous solutions. Functionalization improved SBA-15 capacity for PCP removal from solution in accordance with the trend SBA-15 < ST < SA. Sorption rate experiments data fit the Lagergren pseudo-second order kinetics model. Intra-particle diffusion indicated that the sorption is controlled by two mechanisms: intra-particle and equilibrium diffusion. Adsorptive pore-filling and electrostatic interactions were implicated in the removal of PCP from solution. Electrostatic interaction led to !75% increase in sorption upon functionalization. The equilibrium sorption data of the PCP on these mesoporous materials fits the Freundlich isotherm. Desorption hysteresis was low for the pristine SBA-15, but the functionalized SBA-15 materials showed higher hysteresis. The results imply that functionalized SBA-15 sorbents are promising materials for microscale scavenging of PCP in solution.

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Section: Synthesis and Characterization Of The Sba-15 Sorbentsmentioning

confidence: 91%

Microscale scavenging of pentachlorophenol in water using amine and tripolyphosphate-grafted SBA-15 silica: Batch and modeling studies

Diagboya

Olu-Owolabi

Adebowale

2014

Journal of Environmental Management

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“…At the same time, some of them such as silver, copper and lead are precious and can be recycled and reused in varied applications (Anbia and Ghassemian 2011). Toxic heavy metals such as Pb(II) and Cu(II) in liquid effluents are considered as persistent, non-biodegradable, bioaccumulative and therefore seriously threaten natural ecosystems and the human health (Amini et al 2009;Gercel and Gerc 2007;Júnior et al 2009;Mureseanu et al 2008). Industries, such as mining and electroplating, discharge aqueous effluents containing high levels of heavy metals like uranium, mercury, cadmium, lead and copper (Reddad et al 2002;Gavrilescu 2004).…”

Section: Introductionmentioning

confidence: 99%

Adsorption studies of Pb(II) and Cu(II) ions on mesoporous carbon nitride functionalized with melamine-based dendrimer amine

Anbia

Haqshenas

2015

Int. J. Environ. Sci. Technol.

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Mesoporous carbon nitride functionalized with melamine-based dendrimer amine has been developed. It has been characterized using N 2 adsorption-desorption isotherm, thermogravimetric analysis, Fourier transform spectroscopy and small-angle X-ray scattering techniques. The pore diameter is centered at 4.74 nm with a relatively high BET surface area of 102.2 m 2 /g with a pore volume of 0.12 cm 3 /g. Thermogravimetric analysis curves show that the samples (mesoporous carbon nitride and mesoporous carbon nitride functionalized with melamine-based dendrimer amine) have high thermal stability compared to the earlier species. Batch adsorption experiments were conducted to study the effect of adsorbent dose, temperature, contact time and solution pH for the removal of Pb(II) from aqueous systems. The Pb(II) and Cu(II) removal by mesoporous carbon nitride functionalized with melaminebased dendrimer amine was found to be 196.34 and 199.75 mg/g, respectively. The sorption data are correlated better with the Langmuir adsorption isotherm than Freundlich isotherm. The kinetic analysis has revealed that the overall adsorption process is successfully fitted in the pseudo-second-order kinetic model.

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“…The characteristic of the used adsorbent are presented in Table1. Adsorption studies were performed by batch technique at different temperatures (30,35,40, 45 °C), various adsorbent mass (0.0025, 0.005, 0.0075, 0.01, 0.02, 0.03, 0.04, and 0.05 g, respectively), and a pH range between 2 and 7 (2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, and 7). The pH values were adjusted with 0.1 M NaOH and, respectively, HNO 3 solutions.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Adsorption Capacity of Montmorillonite and Aluminium-pillared Clay for Pb2+, Cu2+ and Zn2+

Humelnicu

Ignat²,

Suchea³

2015

ACSi

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Adsorption capacity of the two adsorbents was investigated as a function of contact time between adsorbent and heavy metal ions solutions, the initial heavy metals concentration of the synthetic wastewater, pH value, temperature and adsorbent mass. Preliminary experiments at different pH values between 2.0 and 7.0 were performed, and were observed that maximum adsorption occurs at pH 5 for copper (q max = 92.59 mg · g -1 ), 6.0 for lead (q max = 97.08 mg · g -1 ) and 6.5 for zinc ions (q max = 73.52 mg · g -1 ), respectively. The sorption capacity of studied adsorbents for Pb 2+ , Cu 2+ and Zn 2+was calculated using Langmuir and Freundlich models. Thermodynamic parameters -enthalpy change (ΔH 0 ), entropy change (ΔS 0 ) and free energy (ΔG 0 ) -were calculated for predicting the nature of adsorption. Scanning electron micrograph (SEM) revealed changes in the surface morphology of the adsorbent as a result of heavy metal ions adsorption. EDS characterization confirmed qualitatively the presence of adsorbed species in the samples. On the basis of the obtained results the adsorption it was proposed an ordered adsorption: Pb 2+ , Cu 2+ and Zn 2+ , on the sorbents we investigated.

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Modified SBA-15 mesoporous silica for heavy metal ions remediation

Cited by 256 publications

References 42 publications

Microscale scavenging of pentachlorophenol in water using amine and tripolyphosphate-grafted SBA-15 silica: Batch and modeling studies

Microscale scavenging of pentachlorophenol in water using amine and tripolyphosphate-grafted SBA-15 silica: Batch and modeling studies

Adsorption studies of Pb(II) and Cu(II) ions on mesoporous carbon nitride functionalized with melamine-based dendrimer amine

Evaluation of Adsorption Capacity of Montmorillonite and Aluminium-pillared Clay for Pb2+, Cu2+ and Zn2+

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