Dye adsorption kinetics of organoamine-templated hollow silica microspheres with different porous structures

Liu, Shiquan; Wang, Haixia; Guan, Ruifang; Sun, Yuanyuan; Liu, Lu

doi:10.1007/s00706-017-2016-7

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…The hydrogels were stable while maintaining NaOH concentrations from 0.1 to 1 mg L –1 in this study (see Supporting Information Table S2). For better understanding, we also compared the dye adsorption efficiency of the hydrogels with previously reported silica-based adsorbents, as shown in Supporting Information Table S3. − It is seen that the adsorption performances of the neutralized SiO 2 –H 3 BO 3 –HDTMS hydrogel are equivalent or even superior considering all testing parameters.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO₂–H₃BO₃–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

Lahiri

Liu

2021

Langmuir

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This study reports a novel cross-linking approach to fabricate the hydrothermally neutralized silica hydrogel of SiO2–H3BO3–hexadecyltrimethoxysilane by grafting alkylsilane groups onto the nanoporous silica. The synthesized silica hydrogel possessed a large specific surface area of 51.3 m2g–1 and showed excellent dye adsorption capability of cationic dyes in neutral (pH 7) and alkaline (pH 9) medium from wastewater. The colloidal electrokinetic potential analysis revealed that the outstanding adsorption efficiency of cationic dyes over anionic dyes strongly relies on the surface charge of the hydrogels. Moreover, the hydrophobic interactions between the dye molecules and the hydrogels were studied, and it was found that the dye adsorption performance can be tuned by altering the concentration of hydrophobic reagents of the hydrogel. The dye adsorption mechanism was established, and the kinetic study suggested that the adsorption is a pseudo-second-order reaction. Adsorption isotherms at various equilibrium conditions fitted well with the Langmuir isotherm. Therefore, this strongly supports the promising and practical application of the prepared silica hydrogel. The recyclability of the hydrogel was studied, and it showed 90% adsorption efficiency by the regenerated gel up to 6 cycles, which has a high potential in wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO₂–H₃BO₃–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

Lahiri

Liu

2021

Langmuir

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“…This technique is also cost-effective, and utilizes materials that are in abundance, of no value, and thrown away as wastes. Some of these materials include wastes from agriculture and industries, aquatic plants, clay, peat, and many others [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Tropical wild fern (Diplazium esculentum) as a new and effective low-cost adsorbent for removal of toxic crystal violet dye

Lim

Usman

Hassan

et al. 2020

Journal of Taibah University for Science

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A tropical wild fern, Diplazium esculentum, locally known as Pakis, was investigated in this study as a low-cost adsorbent for the removal of toxic crystal violet (CV) dye. The adsorbent-adsorbate system reached equilibrium in 180 min and data obtained from batch adsorption experiment were best fitted with the Sips isotherm model. High maximum adsorption capacity (q max ) of 350.86 mg/g compared to many other reported adsorbents revealed the potential of this fern as a low-cost, new adsorbent for the removal of CV. Adsorption mechanism followed the pseudo second-order kinetics. Another attractive feature is its ability to be regenerated and reused, especially when using the base treatment, while maintaining high adsorption of > 96% even at the fifth consecutive cycles.

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“…As illustrated in Figure , the PILs with pore sizes comparable to the sizes of dye molecules could facilitate the adsorption and thermodynamically “lock” the dye molecules in the pores due to the “size-matching” effect. In contrast, the unmatched sizes between the pores and dye molecules lead to either difficult accommodation of bulky dye molecules or favorable desorption of small dye molecules. − …”

Section: Resultsmentioning

confidence: 99%

Control over the Free Space within Poly(ionic liquid)s for Selective Adsorption of “Size-Matching” Dyes

Qin

Zhang

et al. 2020

ACS Appl. Polym. Mater.

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Here we report a strategy to effectively control the free volumes within poly(ionic liquid)s (PILs). The initial parent imidazolium-based PILs were synthesized by copolymerization using three size-variant aryl boratestrifluorophenyl borate (BPhF 3 − ), tetraphenyl borate (BPh 4 − ), and tetranaphthyl borate (BNap 4 − )as couteranions. These counteranions were found to aggregate and play the role of templates and patterning holes. After exchange of the larger anions to chloride or acetate, the smaller anions occupied less inner space of holes, generating the porous structures. Impressively, depending on the types of the initial template anions, the average sizes of holes within these PILs were accurately regulated from 0.78 to 22 nm, showing various high values of specific surface areas. Their successful formation, porosity, and morphology were fully characterized by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer−Emmett−Teller (BET), and elemental analysis. These porous PILs were then used for the adsorption of anionic dyes, such as Congo red, methyl blue, Sirius red, and sodium lignosulfonate. PILs were observed to show the highest adsorption capacities only toward the dyes bearing similar sizes to their average pore sizes, highlighting the size-matching effect. This phenomenon allowed us to not only separate the anionic dyes from cationic and neutral dyes based upon their charges but also selectively isolate the "size-matching" one from a mixture of anionic dyes. The adsorbed dye could be removed by washing with hydrochloric acid aqueous solution or sodium acetate methanol solution, and the PIL adsorbents could be recovered and reused at least five times without obvious decrease of adsorption efficiency.

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Dye adsorption kinetics of organoamine-templated hollow silica microspheres with different porous structures

Cited by 4 publications

References 10 publications

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO₂–H₃BO₃–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO₂–H₃BO₃–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

Tropical wild fern (Diplazium esculentum) as a new and effective low-cost adsorbent for removal of toxic crystal violet dye

Control over the Free Space within Poly(ionic liquid)s for Selective Adsorption of “Size-Matching” Dyes

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Dye adsorption kinetics of organoamine-templated hollow silica microspheres with different porous structures

Cited by 4 publications

References 10 publications

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO2–H3BO3–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO2–H3BO3–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

Tropical wild fern (Diplazium esculentum) as a new and effective low-cost adsorbent for removal of toxic crystal violet dye

Control over the Free Space within Poly(ionic liquid)s for Selective Adsorption of “Size-Matching” Dyes

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Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO₂–H₃BO₃–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO₂–H₃BO₃–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater