Mesoporous titanate-based cation exchanger for efficient removal of metal cations

Lu, Zhenda; Hu, Yongxing; Zhang, Qiao; Yin, Yadong

doi:10.1039/c3ta01396k

Cited by 35 publications

(13 citation statements)

References 38 publications

(39 reference statements)

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“…The results above indicate that a pure NaOH solution at 480 mg mL –1 showed much stronger adhesion force than that of the silica NPs prepared in the presence of NaOH with the same concentration. This phenomenon may be attributed to the fact that silica NPs could be etched in the basic media, as reported by other research groups previously . The reaction between silica NPs and the base (i.e., NaOH or KOH) lead to the decrease of the base concentration and caused a lower adhesion force.…”

supporting

confidence: 56%

Silica Nanoparticles as Adhesives for Biological Tissues? Re‐Examining the Effect of Particles Size, Particle Shape, and the Unexpected Role of Base

Liu

Peng

Yang

et al. 2017

Part & Part Syst Charact

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Development of new, effective, and patient‐friendly adhesives for biological tissues is important for medical and surgical practices such as bleeding control and organ repairing. While some commercially available silica nanoparticles such as LUDOX SM‐30 have shown adhesive properties for biological tissues, the role of inorganic base present in the adhesive properties of the silica nanoparticles has not been examined. Moreover, it remained unclear how the size and the shape of silica nanoparticles affect the adhesion properties. To address these questions, synthesis and characterization of a series of uniform silica nanostructures with different sizes and shapes is carried out. Unexpectedly, none of the synthesized silica nanostructures without additional inorganic base shows adhesion properties against liver tissues. Such surprising phenomena motivate to examine other factors in the commercial silica nanoparticles as tissue adhesives, and reach a conclusion that the inorganic base plays a key role in the adhesion properties. It is believed that this study answers the important question whether silica nanoparticles can act as biological adhesives or not. The conclusion also gives a lesson to other scientists and engineers in design and exploration of new biological adhesives.

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supporting

confidence: 56%

Silica Nanoparticles as Adhesives for Biological Tissues? Re‐Examining the Effect of Particles Size, Particle Shape, and the Unexpected Role of Base

Liu

Peng

Yang

et al. 2017

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“…In addition, the “bread layer” seems to be of much smaller significance compared with the core layer in applications involving energy, catalysis, and biomedicine. Considering the previous studies in the silicon-based template removal 22 , 23 and Lewis acidic etching for preparing MXenes 24 , it may be possible for a wet-chemical exfoliation method (based on alkali etching) to intelligently “capture” the ultrathin and biocompatible FCLs (MgO and Fe 2 O 3 ) sandwiched between two identical tetrahedral layers (SiO 2 and Al 2 O 3 ) from VMT. Moreover, the main ingredients of FCL NSs are MgO and Fe 2 O 3 , both approved by the U.S. Food and Drug Administration (FDA) and widely used in the clinic.…”

Section: Introductionmentioning

confidence: 99%

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

et al. 2021

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Clay-based nanomaterials, especially 2:1 aluminosilicates such as vermiculite, biotite, and illite, have demonstrated great potential in various fields. However, their characteristic sandwiched structures and the lack of effective methods to exfoliate two-dimensional (2D) functional core layers (FCLs) greatly limit their future applications. Herein, we present a universal wet-chemical exfoliation method based on alkali etching that can intelligently “capture” the ultrathin and biocompatible FCLs (MgO and Fe2O3) sandwiched between two identical tetrahedral layers (SiO2 and Al2O3) from vermiculite. Without the sandwich structures that shielded their active sites, the obtained FCL nanosheets (NSs) exhibit a tunable and appropriate electron band structure (with the bandgap decreased from 2.0 eV to 1.4 eV), a conductive band that increased from −0.4 eV to −0.6 eV, and excellent light response characteristics. The great properties of 2D FCL NSs endow them with exciting potential in diverse applications including energy, photocatalysis, and biomedical engineering. This study specifically highlights their application in cancer theranostics as an example, potentially serving as a prelude to future extensive studies of 2D FCL NSs.

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“…The variation in membrane porosity seems to affect the ammonium rejection insignificantly, as the surface hydrophobicity may be sufficient enough to prevent ammonia vapor from passing through the membrane to the permeate side. Additionally, higher ammonium rejection could be explained by the cation-exchange capacity of TiO 2 to bind the ammonium ion present in feed solution [ 34 , 35 , 36 ]. It was reported that the titanate-based materials functioned as adsorbent for the removal of ammonium ion due to the interaction between Ti-OH and NH 4 + , which probably formed the hydrogen bonding [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Improvement of Membrane Distillation Using PVDF Membrane Incorporated with TiO2 Modified by Silane and Optimization of Fabricating Conditions

2021

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The objectives in this study are to improve the performance of PVDF membrane by incorporating TiO2 and silane at various dosages and optimize fabricating conditions by using response surface methodology (RSM) for membrane distillation (MD) application. The PVDF membrane was synthesized by phase inversion method using various TiO2, silane and polymer concentrations. Membranes were characterized by performing contact angle measurements, SEM and FTIR observations. Ammonia rejection and permeate flux were measured by operating a direct contact distillation module treating ammonium chloride solution. A PVDF membrane created by adding TiO2 modified by silane improved membrane hydrophobicity. However, the effect of silane on membrane hydrophobicity was less pronounced at higher TiO2 concentrations. Highest ammonium rejection was associated with the highest membrane hydrophobicity. RSM analysis showed that fabricating conditions to achieve highest flux (10.10 L/m2·h) and ammonium rejection (100.0%) could be obtained at 31.3% silane, 2.50% TiO2, and 15.48% polymer concentrations. With a PVDF-TiO2 composite membrane for MD application, the effect of TiO2 was dependent upon silane concentration. Increasing silane concentration improved membrane hydrophobicity and ammonium rejection. RSM analysis was found to bea useful way to explore optimum fabricating conditions of membranes for the permeate flux and ammonium rejection in MD.

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Mesoporous titanate-based cation exchanger for efficient removal of metal cations

Cited by 35 publications

References 38 publications

Silica Nanoparticles as Adhesives for Biological Tissues? Re‐Examining the Effect of Particles Size, Particle Shape, and the Unexpected Role of Base

Silica Nanoparticles as Adhesives for Biological Tissues? Re‐Examining the Effect of Particles Size, Particle Shape, and the Unexpected Role of Base

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

Improvement of Membrane Distillation Using PVDF Membrane Incorporated with TiO2 Modified by Silane and Optimization of Fabricating Conditions

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