Controlling wettability of AgI/BiVO4 composite photocatalyst and its effect on photocatalytic performance

Wang, Lulu; Zhang, Sifeng; Wu, Shenglan; Long, Yanju; Li, Lingxin; Zheng, Ziguang; Hei, Yunrui; Zhou, Luting; Luo, Liang; Jiang, Fengzhi

doi:10.1016/j.jallcom.2020.155367

Cited by 20 publications

(7 citation statements)

References 40 publications

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“…As shown in Figure S3d, the CO peak (532.0 eV) presented similar trends to that of the C 1s peak, and the stronger peak of CF 3 could be ascribed to PFTS grafting . XPS narrow-scan results of the F 1s of the pristine PVDF and fSiO 2 /PVDF membranes prepared over different surface mineralization periods are shown in Figure S5b, where a strong peak at 688.0 eV was attributed to the FC bond from PFTS grafting …”

Section: Resultsmentioning

confidence: 63%

“…46 XPS narrow-scan results of the F 1s of the pristine PVDF and fSiO 2 /PVDF membranes prepared over different surface mineralization periods are shown in Figure S5b, where a strong peak at 688.0 eV was attributed to the F�C bond from PFTS grafting. 47 Figure S6 Figure 1 exhibits the surface microstructures of fSiO 2 /PVDF membranes prepared after different surface mineralization periods and cross-sectional images of the fSiO 2 /PVDF-6h membrane. As shown in Figure 1a, a relatively smooth microstructure with a surface roughness of Ra 89.8 nm was obtained.…”

Section: Resultsmentioning

confidence: 99%

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Development of Robust Fluorinated SiO₂/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation

et al. 2022

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In this study, a superhydrophobic composite hollow fiber membrane consisting of a fluorinated silicification layer (fSiO 2 ) upon a poly(vinylidene fluoride) (PVDF) substrate was developed via in situ silicification integrated with surface hydrophobic modification for bromine resources recovery from brine via membrane distillation (MD). The re-entrant hierarchical structure was established via surface silicification, after which (1H,1H,2H,2H-heptadecafluorodecyl) silane was introduced to transfer the surface property to be hydrophobic by reducing the surface energy with long fluorinated chains. The resultant fSiO 2 / PVDF composite membrane exhibited a superhydrophobic property with a water contact angle of 147°, which effectively prevents wetting when conducting MD, and performed a high permeating flux of 0.62 kg•m −2 •h −1 . In a long-term stability test of 10-day operation duration, the fSiO 2 /PVDF composite membrane remained decent, with flux declines of 1.8% and 38.3% when treated by the aqueous bromine solution and real brine, respectively. This work sheds insight into the fabrication of novel inorganic/organic composite membranes for bromine resource extraction from brine.

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Section: Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Development of Robust Fluorinated SiO₂/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation

et al. 2022

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“…It indicates that the layer built by TiO 5 and SiO 4 units is stable in water and finally disintegrates in acid washing. The bands assigned to the stretching vibrations of O–H groups (at about 3430 cm −1 ) and the bending vibrations of H–O–H in H 2 O molecules (at about 1630 cm −1 ) are also observed [ 41 , 42 ]. With the disintegration of the structure, many titanyl clusters and silicate materials are supposed to be formed, which is proved by the stretching of apical Ti–O bonds of TiO 2 clusters at 954 and 1054 cm −1 [ 43 ] and the Si–O stretching of Q 0 silicate near 1200 cm −1 [ 44 ] shown in Figure 8 .…”

Section: Resultsmentioning

confidence: 99%

Vibrational Spectral Analysis of Natisite (Na2TiSiO5) and its Structure Evolution in Water and Sulfuric Acid Solutions

et al. 2021

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Natisite (Na2TiSiO5) is a layered sodium titanosilicate containing TiO5 square pyramids. The structure evolution of natisite in water and acid solutions is the basis for its potential applications. With Na2SiO3 as the silicon source, natisite with the shape of the square sheet was selectively prepared from the hydrothermal method with 14.3 mol/L NaOH solution at 240 °C. Natisite has 20 Raman active modes and 22 infrared active modes from the first-principles calculations within density functional theory, and the calculated Raman and infrared spectra agree well with the experimental ones. The characteristic Raman peak at 844 cm−1 is caused by the symmetric stretching of the apical Ti–O bond in the TiO5 unit, assigning to A1g and B2g modes. Natisite remains relatively stable in water with a sodium leaching percentage of lower than 6%. When washing with sulfuric acid solutions, the interlayer spacing of natisite is reduced due to the extensive removal of sodium ions, and an intermediate composed of SiO4 and newly formed TiO6 units may be formed. Moreover, after washing with water and acid solutions, 95.5%, 63.4%, and 35.2% of Na, Si, and Ti in natisite can be leached in total, respectively, resulting in the structural disintegration of natisite.

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“…Some proper functional groups on the surface of biochar were effectively identified such that the intensity of the wide adsorption band around 3400 cm −1 could be attributed to O-H stretching of acid or to alcohol structures, that around 2368-2381 cm −1 could indicate the presence of carbon dioxide (O=C=O), and around 1590-1850 cm −1 may indicate C=C stretching from alkenes, around 1360 cm −1 may indicate the presence of C-O, C=O and probably C-H bending modes. The stretching vibration absorption peak around 1050 cm −1 of the modified hydrophobic biochar was significantly stronger and wider than that of the original biochar, indicating that the modified biochar was grafted with the modifier and generated a large amount of C-O-Si and Si-O [20,[26][27][28][29][30][31]. Hydrophobic groups in KH-570 effectively bound to the surface of the biochar, forming a hydrophobic organic coating [20].…”

Section: Ft-ir and Tga Analysismentioning

confidence: 99%

Surface Hydrophobic Modification of Biochar by Silane Coupling Agent KH-570

Zhang

Zhu

et al. 2022

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Biochar-amended soil cover (BSC) in landfills can improve the oxidation of methane. However, adding biochar can cause a larger amount of rainwater to enter the soil cover and landfill because it increases the permeability of the soil cover, which increases leachate production. Improving the hydrophobicity and waterproof ability of BSC is expected to reduce rainwater that goes into landfills. Silane coupling agent KH-570 is used to modify biochar to improve its hydrophobicity and waterproof ability after being added to the soil cover. The waterproofness of hydrophobic biochar-amended soil cover (HBSC) was studied by conducting a precipitation simulation test. Results showed that the optimum hydrophobicity of the surface-modified biochar was obtained when the mass fraction of KH-570 was 7%, the biochar dosage was 7 g, and the modification temperature was 60 °C. In these conditions, the contact angle was 143.99° and the moisture absorption rate was 0.10%. The analysis results of thermogravimetric, X-ray diffractometer and scanning electron microscopy before and after the biochar modification showed that KH-570 formed a hydrophobic organic coating layer on the biochar surface, indicating that the surface hydrophobic modification of biochar was successfully carried out by silane coupling agent. The waterproof ability of HBSC was significantly better than that of BSC in the simulated precipitation test.

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Controlling wettability of AgI/BiVO4 composite photocatalyst and its effect on photocatalytic performance

Cited by 20 publications

References 40 publications

Development of Robust Fluorinated SiO₂/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation

Development of Robust Fluorinated SiO₂/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation

Vibrational Spectral Analysis of Natisite (Na2TiSiO5) and its Structure Evolution in Water and Sulfuric Acid Solutions

Surface Hydrophobic Modification of Biochar by Silane Coupling Agent KH-570

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Controlling wettability of AgI/BiVO4 composite photocatalyst and its effect on photocatalytic performance

Cited by 20 publications

References 40 publications

Development of Robust Fluorinated SiO2/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation

Development of Robust Fluorinated SiO2/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation

Vibrational Spectral Analysis of Natisite (Na2TiSiO5) and its Structure Evolution in Water and Sulfuric Acid Solutions

Surface Hydrophobic Modification of Biochar by Silane Coupling Agent KH-570

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Product

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Development of Robust Fluorinated SiO₂/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation

Development of Robust Fluorinated SiO₂/PVDF Composite Hollow Fiber Membrane for Bromine Resources Recovery from Brine via Membrane Distillation