Tannic acid adsorption on amino-functionalized magnetic mesoporous silica

Wang, Jiahong; Zheng, Shourong; Liu, Jingliang; Xu, Zhaoyi

doi:10.1016/j.cej.2010.08.066

Cited by 106 publications

(40 citation statements)

References 30 publications

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“…This may be a reason for causing an increase in uptake with increasing TA concentrations. Other researchers have seen similar results using various adsorbents to remove TA from aqueous solutions [15,39].…”

Section: Effect Of Ta Concentration and Adsorption Time On The Removasupporting

confidence: 64%

“…At low initial TA concentration, TA molecules or ions are mainly adsorbed on the external adsorption sites of MIEX resin. At high initial TA concentration, however, the greater TA concentration difference between in-solution and on the surface of MIEX makes the TA molecules or ions enter deeply into the internal pores, which ensures that the internal active sites of resin are fully utilized [15]. This may be a reason for causing an increase in uptake with increasing TA concentrations.…”

Section: Effect Of Ta Concentration and Adsorption Time On The Removamentioning

confidence: 98%

“…When the initial pH of solution increased from 8 to 11, the adsorption capacity of TA on MIEX resin increased rapidly from 11.34 to 14.25 mg/mL, showing that alkalinity furthers the removal of TA adsorbed on MIEX resin. However, many researchers have reported that the removal of TA adsorbed on various adsorbents decreased with increasing pH when pH is above 8 [2,[12][13]15]. Also, the removal of anions (such as bromide, phosphate) using MIEX resin decreased when pH was above 8 [26][27].…”

Section: Effect Of Initial Ph Of Solutionmentioning

confidence: 99%

“…It could be calculated from the Dubinin-Radushkevich model [34][35] and described by the following equations (15)(16)(17). So the Dubinin-Radushkevich model was applied to fit the adsorption equilibrium data at different adsorption temperatures and calculated the average free energy for the adsorption of TA onto MIEX resin.…”

Section: Adsorption Thermodynamic Studiesmentioning

confidence: 99%

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Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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Tannic acid (TA) is a component of natural organic matter (NOM) and is ubiquitously present in most surface and groundwater due to the decomposition of plant biomass [1][2]. Previous research has demonstrated that TA is toxic for aquatic organisms such as algae, phytoplankton, fish, and invertebrates, which can cause serious environment problems [3]. Particularly, TA can react with chlorine and form carcinogenic disinfection by-products (DBPs) during the conventional chlorination disinfection process of drinking water [4][5]. Therefore, it is necessary to seek effective methods for reducing and removing TA from raw water. [12,16] have been utilized to remove TA from water and wastewater. Among different adsorbents, the anion ion-exchange resin is considered one of the most effective methods due to its high removal efficiency [17]. As a novel anion ionexchange resin, magnetic ion exchange (MIEX) resin can be a potential candidate for TA removal with its promising technology for NOM removal from drinking water [18].Pol. J. Environ. Stud. Vol. 26, No. 3 (2017) This study evaluated the removal characteristics of tanic acid (TA) adsorbed on MIEX resin by batch experiments. MIEX resin can effectively remove TA from raw water at pH 6-9. Chloride and sulfate have adverse effect on the removal of TA. Conversely, bicarbonate can further the removal of TA. The Elovich model is the most suitable for depicting the kinetic process, and liquid film diffusion dominates the adsorption rate. The Freundlich model is reliable for describing the adsorption equilibrium. Adsorption is an endothermic, entropy-driving, and thermodynamically spontaneous process. The energy changes confirm the physical adsorption and dominate adsorption behavior. The sodium chloride solution (0.5%) can effectively regenerate the MIEX resin saturated TA, and the regenerated resin can be used circularly. Therefore, MIEX resin is a promising adsorbent for the removal of TA from raw water.

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Section: Effect Of Ta Concentration and Adsorption Time On The Removasupporting

confidence: 64%

Section: Effect Of Ta Concentration and Adsorption Time On The Removamentioning

confidence: 98%

Section: Effect Of Initial Ph Of Solutionmentioning

confidence: 99%

Section: Adsorption Thermodynamic Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

show abstract

“…It was reported that nanocomposites are safer and more effective nanomaterials to apply in the field of water purification [10]. Moreover, functionalization of inorganic nanoparticles, such as silica particles, with organic polymers enhanced their adsorption, mechanical, and exchange capacity [11][12][13]. However, the incorporation of new functionalized nanoporous materials is important for removing inorganic pollutants because the nanoparticles often exhibit superior properties [14].…”

Section: Introductionmentioning

confidence: 99%

Application of Super-Amphiphilic Silica-Nanogel Composites for Fast Removal of Water Pollutants

et al. 2016

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This work first reports the preparation of super-amphiphilic silica-nanogel composites to reduce the contact angle of water to increase the diffusion of pollutant into adsorbents. In this respect, the silica nanoparticles were encapsulated into nanogels based on ionic and nonionic polyacrylamides by dispersion polymerization technique. The morphologies and the dispersion stability of nanogel composites were investigated to clarify the ability of silica-nanogel composites to adsorb at different interfaces. The feasibility of silica polyacrylamide nanogel composites to act as a high-performance adsorbent for removal of methylene blue (MB) dye and heavy metals (Co 2+ and Ni 2+ ) from aqueous solution was investigated. The surface tension, contact angle, average pore size, and zeta potential of the silica-nanogel composites have been evaluated. The MB dye and heavy metal adsorption capacity achieved Q max = 438-387 mg/g which is considerably high. The adsorption capacity results are explained from the changes in the morphology of the silica surfaces as recorded from scanning electron microscopy (SEM).

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Rapid construction of hierarchically porous metal–organic frameworks by a spray‐drying strategy for enhanced tannic acid adsorption

et al. 2021

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Metal-organic frameworks (MOFs) have attracted much attention owing to their tailored pore environment and surface functionality. However, most of the currently reported MOFs are confined to small pore sizes (<5 nm), limiting their practical applications. Here, a facile and versatile strategy for rapid construction of hierarchically porous MOFs (HP-MOFs) by spray-drying is reported, in which presynthesized nanosized MOFs (N-MOFs) can be assembled to form MOF microspheres with meso/macropores resulting from the interspace among closely arranged N-MOFs. This strategy enables the construction of multicomponent HP-MOFs with various functions. As a proof of concept, we show that the adsorption for tannic acid (TA) can be significantly enhanced using HP-MIL-101(Cr). Particularly, HP-MIL-101-30 (30 represents the primary nanoparticle size) exhibits a record-high adsorption capacity (1175 mg g À1 ), and the adsorption rate of HP-MIL-101-30 is increased by 50% compared to that of N-MIL-101-30. These findings have important implications for the rapid construction of HP-MOFs, which is beneficial for the adsorption of large molecules.

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Tannic acid adsorption on amino-functionalized magnetic mesoporous silica

Cited by 106 publications

References 30 publications

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Application of Super-Amphiphilic Silica-Nanogel Composites for Fast Removal of Water Pollutants

Rapid construction of hierarchically porous metal–organic frameworks by a spray‐drying strategy for enhanced tannic acid adsorption

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