A waxberry-like SiO<sub>2</sub>@MnSiO<sub>3</sub> core–shell nanocomposite synthesized via a simple solvothermal self-template method and its potential in catalytic degradation and heavy metal ion removal

Yuan, Lixia; Gao, Qiang; Ma, Chun−Fang; Gong, Yansheng; Han, Bo; Xia, Kaisheng; Zhou, Chenggang

doi:10.1039/c6ra00070c

Cited by 21 publications

(8 citation statements)

References 56 publications

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“…In addition, the b value of IIP‐PEI/CM (0.057) is also higher than that of NIP‐PEI/CM (0.010), which suggests that IIP‐PEI/CM has more affinity towards W(VI) in comparison with NIP‐PEI/CM. These results indicate that the binding process of W(VI) onto IIP‐PEI/CM or NIP‐PEI/CM is restricted to a monolayer adsorption, and the binding sites on the membrane surface are uniform …”

Section: Resultsmentioning

confidence: 85%

“…It can be found that, after three cycles, the rejection ratio of W(VI) declines from 98.1% to 94.3% with only 3.87% loss of initial rejection ratio. Such phenomenon is probably due to the loss of small amounts of binding sites during the operation and cleaning processes . The rejection ratio still keeps at a high value after the cycle tests, disclosing the good surface composition and chemical stability of IIP‐PEI/CM.…”

Section: Resultsmentioning

confidence: 93%

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Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Dong

Zeng

Zhou

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: It is significantly important to develop new technologies and materials for removal of tungstate anions (W(VI)) from aqueous solutions. An ion imprinted membrane not only possesses all virtues of a separation membrane, but also has tailor-made recognition sites. In this work, a novel surface anion-imprinted ceramic membrane (IIP-PEI/CM) was fabricated to remove W(VI) selectively from aqueous solutions. RESULTS: FT-IR, XPS, TGA, SEM, streaming potential, pore size distribution and water flux confirmed the successful fabrication of IIP-PEI/CM. With increasing pH, binding capacities (Q e ) of W(VI) onto IIP-PEI/CM and non-imprinted membrane (NIP-PEI/CM) rapidly decreased. At pH = 2.0, Q e values of IIP-PEI/CM and NIP-PEI/CM were 139.4 and 47.9 mg 100 g −1 , respectively. Binding equilibrium was achieved within 3 min, showing an ultra-fast kinetic process. Compared with NIP-PEI/CM, IIP-PEI/CM had higher selectivity for W(VI) in the presence of Mo(VI) and Cr(VI) ions, and its selectivity coefficients for W(VI)/Mo(VI) and W(VI)/Cr(VI) were 15.47 and 19.74, respectively. During dynamic filtration, IIP-PEI/CM was effective and selective for removal of W(VI), and it had a good reusability. Protonated amine groups within PEI participated the uptake of W(VI) by electrostatic interactions. CONCLUSION: IIP-PEI/CM showed ultrafast and selective binding of W(VI) anions, and has potential application for W(VI) removal/recovery from aqueous solutions.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 93%

Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Dong

Zeng

Zhou

et al. 2018

J of Chemical Tech & Biotech

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“…To further study the catalytic performance, Table 1 lists the rate constants and the consumption of MB caused by 1 g catalyst and 1 L 30 wt% H 2 O 2 solution. At 60 °C and the dosage of H 2 O 2 of 3 mL, there are an optimal rate constant (≈0.828 min −1 ) and Q value (81.9 g L −1 g −1 ), 530% higher than those of SiO 2 @MnSiO 3 which included adsorption and catalytic processes . Such a superior performance is attributed to the hollow tubular structure with open ends and mesoporous walls.…”

Section: Resultsmentioning

confidence: 97%

“…Where C t and k are the concentrations of MB at the time t and the rate constant, respectively . The catalytic efficiency can also be evaluated by Q

Q = (C_{0} - C) V_{0} / V' m

…”

Section: Methodsmentioning

confidence: 99%

“…Zeng and co‐workers reported the hollow manganese silicate nanospheres with nanobubble‐shell structure for effective decomposition of MB within 15 min at 60 °C . Gao and co‐workers fabricated a waxberry‐like SiO 2 @MnSiO 3 core–shell nanocomposite, which decomposed 93% of MB within 40 min at 60 °C . However, high temperature is usually not preferred from the viewpoint of practical application and energy saving.…”

Section: Introductionmentioning

confidence: 99%

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Hollow Manganese Silicate Nanotubes with Tunable Secondary Nanostructures as Excellent Fenton‐Type Catalysts for Dye Decomposition at Ambient Temperature

Hao

Zhu

et al. 2016

Adv Funct Materials

127

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Fast diffusion rate of ions and sufficiently exposed active sites are important for catalysts. As a superior but rarely studied Fenton‐type catalyst, unsatisfactory ion diffusion rate of manganese silicate is the exact obstacle for improving its catalytic activity. Here, hierarchical manganese silicate hollow nanotubes (MnSNTs) assembled by tunable secondary structures are precisely fabricated by an efficient hydrothermal method and systematically investigated as Fenton‐type catalysts for the first time. The open end and thin mesoporous walls of the hollow nanotubes help shorten the diffusion pathway of ions and enhance the mass transport. Moreover, the numerous standing small nanosheets endow MnSNTs with higher specific surface area and larger pore volume than the large nanosheets and nanoparticles, and thus expose more active sites for adsorption and catalytic decomposition. MnSNTs are highly efficient in adsorption and catalytic decomposition of cationic dyes with an excellent recycling stability. About 98.1% of methylene blue is catalytically decomposed in 45 min at an ambient temperature of 25 °C. When the temperature increases to 60 °C, only 2 min are required, with a 530% higher kinetic constant than reported.

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Adsorption of Brilliant Blue and Malachite Green by Nano‐graphene Exfoliated from Waste Batteries

Karunanithi¹,

Kumar²,

Balakrishnan

et al. 2021

Chem Eng & Technol

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Waste graphite rods from waste batteries, acting as a source of graphite, were electrochemically exfoliated to synthesize graphene. Mesoporous graphene with a pore size of 14.81 Å and a surface area of 710.396 m2g−1 was chosen for adsorptive studies involving toxic dyes, Brilliant Blue (BB) and Malachite Green (MG), by varying the graphene dosage, contact period, temperature, pH, and the concentration of the dye solution. The maximum adsorption capacities reported were 120 mg gBB−1 and 342 mg gMG−1, with dye removal rates of BB and MG greater than 99 and 98 %, respectively. Adsorption occurred as multilayer, following the Freundlich isotherm model, and the pseudo‐second‐order kinetic model fitted best, indicating chemisorption. Thermodynamic studies reveal an exothermic, spontaneous, and chemical adsorption.

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A waxberry-like SiO₂@MnSiO₃ core–shell nanocomposite synthesized via a simple solvothermal self-template method and its potential in catalytic degradation and heavy metal ion removal

Abstract: A novel waxberry-like SiO2@MnSiO3 core–shell nanocomposite was facilely fabricated via the simple one-step thermal treatment of SiO2 nanospheres, MnCl2·4H2O, ethylenediamine (EDA), and ethylene glycol (EG).

Cited by 21 publications

References 56 publications

Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Hollow Manganese Silicate Nanotubes with Tunable Secondary Nanostructures as Excellent Fenton‐Type Catalysts for Dye Decomposition at Ambient Temperature

Adsorption of Brilliant Blue and Malachite Green by Nano‐graphene Exfoliated from Waste Batteries

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A waxberry-like SiO2@MnSiO3 core–shell nanocomposite synthesized via a simple solvothermal self-template method and its potential in catalytic degradation and heavy metal ion removal

Abstract: A novel waxberry-like SiO2@MnSiO3 core–shell nanocomposite was facilely fabricated via the simple one-step thermal treatment of SiO2 nanospheres, MnCl2·4H2O, ethylenediamine (EDA), and ethylene glycol (EG).

Cited by 21 publications

References 56 publications

Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Hollow Manganese Silicate Nanotubes with Tunable Secondary Nanostructures as Excellent Fenton‐Type Catalysts for Dye Decomposition at Ambient Temperature

Adsorption of Brilliant Blue and Malachite Green by Nano‐graphene Exfoliated from Waste Batteries

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A waxberry-like SiO₂@MnSiO₃ core–shell nanocomposite synthesized via a simple solvothermal self-template method and its potential in catalytic degradation and heavy metal ion removal