Adsorption of heavy metals on functionalized-mesoporous silica: A review

Da’na, Enshirah

doi:10.1016/j.micromeso.2017.03.050

Cited by 395 publications

(130 citation statements)

References 138 publications

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“…Compared with SMS, three additional absorption peaks of ASMS are clearly visible at 693 cm À1 , 1541 cm À1 , and 2938 cm À1 . 47 The peak at 2938 cm À1 can be interpreted as the vibration peak for C-H stretching from CH 2 or CH 3 . 48 Furthermore, the two absorption peaks occurring at 693 cm À1 and 1541 cm À1 correspond to the bending vibration peak of N-H and the symmetrical vibration peak of -NH 3 + , respectively.…”

Section: Characterization Of Samplesmentioning

confidence: 99%

Dynamic adsorption of toluene on amino-functionalized SBA-15 type spherical mesoporous silica

et al. 2019

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Amino-functionalized spherical mesoporous silica (ASMS) materials were successfully prepared via a convenient treatment method by using 3-aminopropyltrimethoxysilane (APTES), which was used in different concentrations in the process of spherical mesoporous silica (SMS) synthesis. The adsorption performances of ASMS were evaluated by taking toluene as a simulated pollutant and the adsorption mechanism was also studied. A variety of characterization methods were adopted, including scanning electron microscopy, small-angle X-ray diffraction and Fourier-transform infrared spectroscopy techniques and nitrogen adsorption-desorption analyses, which led to a better understanding of the performance of the materials. It was found that the SMS has a good adaptability due to the amino functionality, the pore structure still remains in the modified samples even when the mass ratio of APTES/TEOS is up to 3, and the chemical properties of the material surface are significantly improved by the amino functionality. The results show that the capacities of the toluene adsorption follow the order of SMS < ASMS-1 < ASMS-3 < ASMS-2. ASMS-2 has the highest toluene adsorption capacity (98.1 mg g À1 ) and the saturated adsorbent can be easily regenerated by thermal desorption, which has a stable adsorption capacity after 4 adsorption cycles. These experimental data indicated that amino functionalization could affect both the pore structure and surface chemical properties of SMS, making ASMS a promising material for the reduction of industrial volatile organic compound emissions in air treatment.

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Section: Characterization Of Samplesmentioning

confidence: 99%

Dynamic adsorption of toluene on amino-functionalized SBA-15 type spherical mesoporous silica

et al. 2019

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“…Silica nanoparticles have a broad application range, from filler materials in car tires, polishing agents, or ceramic additives [24] to high-tech applications such as carrier systems for pharmaceuticals [25,[40][41][42] or adsorbents for pollutants [26,27]. The basic synthesis route for monodisperse silica nanoparticles was presented by Stöber et al [28] and is frequently applied.…”

Section: Synthesis Of Silica Nanoparticlesmentioning

confidence: 99%

Modular Manufacturing Platform for Continuous Synthesis and Analysis of Versatile Nanomaterials

et al. 2019

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Nanoparticular materials have a great potential in various fields including technical and biomedical applications; to meet the specific requirements, a good control over the particle characteristics is mandatory. Addressing this, a modular system for the automated and continuous synthesis, workup, and analysis of a broad range of nanoparticles was developed. Application examples of inorganic (silica) and organic (polymersomes, niosomes) nanoparticles demonstrate the versatility of the production platform. Modules for downstream processing via a falling‐film microreactor or tangential flow filtration are presented. The hydrodynamic size as a key parameter is acquired in real time, with an inline dynamic light scattering device. All modules are controlled and operated by a process control system.

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“…As shown in Fig. 4(a), the intraparticle diffusion model was also used to evaluate the dynamic interaction of the heavy metal cations Cd(II) with ST and ST-750 as the adsorbent by using eqn (5). According to the intra-particle diffusion model, if the rate limiting step is the intra-particle diffusion, the q t plotted against the square root of time should be a straight line and pass through the origin (C ¼ 0), the deviation of the plot from the linearity indicates that the ratelimiting step should be boundary layer (lm) diffusion.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…[1][2][3] The main threats to human health from heavy metals are associated with exposure to Cd(II) and Pb(II). [4][5][6][7] Several typical techniques have been applied for heavy metal removal from aqueous solutions to minimize the risk of adverse health effects, such as hydroxide precipitation method, [8][9][10] ferrite reaction separation, 11 ion exchange method, [12][13][14][15] and membrane treatment technology. [16][17][18][19] Among these options, increasing attention has been paid to adsorption due to its economic feasibility, effectiveness, simplicity of application, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional mesoporous calcium carbonate–silica frameworks thermally activated from porous fossil bryophyte: adsorption studies for heavy metal uptake

Wang

Yang

et al. 2018

RSC Adv.

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In this paper, three-dimensional mesoporous calcium carbonate-silica frameworks have been created from the straw tufa (ST) originating from porous fossil bryophyte by a thermal activation technique. A batch of adsorption kinetic and thermodynamic experiments were used to investigate the adsorption capacity of Cd (II) The adsorption capacities of Cd(II) and Pb(II) both decrease with the addition of the other heavy metal cations, indicating that the adsorption is hindered by the competitive adsorption and the adsorption active sites on the mineral surface are readily exchangeable. The adsorption of Cd(II) and Pb(II) followed the pseudo-second order kinetics model well. In addition, the Langmuir model could accurately describe the adsorption isotherms. Based on the results of characterization with TEM, XRD and XPS, the adsorption mechanisms could be primarily explained as formation of Cd(OH) 2 and CdCO 3 as well as Cd(HCO 3 ) 2 precipitation on the surface of ST. These characteristics of ion-exchange and the adsorptive property for ST modified allow it to be widely used in artificial wetland landfill and environmental protection.

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Adsorption of heavy metals on functionalized-mesoporous silica: A review

Cited by 395 publications

References 138 publications

Dynamic adsorption of toluene on amino-functionalized SBA-15 type spherical mesoporous silica

Dynamic adsorption of toluene on amino-functionalized SBA-15 type spherical mesoporous silica

Modular Manufacturing Platform for Continuous Synthesis and Analysis of Versatile Nanomaterials

Three-dimensional mesoporous calcium carbonate–silica frameworks thermally activated from porous fossil bryophyte: adsorption studies for heavy metal uptake

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