Mercapto-functionalized ordered mesoporous silica-modified PVDF membrane for efficiently scavenging Cd2+ from water

Zhao, Fengbin; Yao, Xinyun; Liu, Chang; Ran, Xianqiang; Wang, Chengxian; Lü, Bin

doi:10.1016/j.jenvman.2021.114103

Cited by 5 publications

(3 citation statements)

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“…As shown in Figure D, the lacquer film cured with laccase (and stored for 6 months) has a water contact angle of 78.5°, consistent with the former reports. , Compared with the lacquer film, all the UPTs show a decrease of water contact angle, indicating improved hydrophilicity, which can be explained by the introduction of polar carbamate functions. For UPs that may possess excess mercapto functions (i.e., UPT2), the contact angle further decreases to around 55 °C, which is believed to be a result of enhanced hydrophilicity introduced by the presence of more polar ester groups and more inherent hydrophilic −SH groups. , The enrichment of mercapto functions also allows for further modifications such as secondary thiol–ene clicks to graft other moieties, or application as heavy or radioactive metal adsorbents with promising adsorption ability. , …”

Section: Resultsmentioning

confidence: 99%

“…45,46 The enrichment of mercapto functions also allows for further modifications such as secondary thiol−ene clicks to graft other moieties, or application as heavy or radioactive metal adsorbents with promising adsorption ability. 47,48 Thermal stability of UPTs was investigated by DSC and TGA with a laccase cured lacquer film as the reference. The records are depicted in Figure 2C and Figure 3.…”

Section: Preparation and Characterization Of The Upt Networkmentioning

confidence: 99%

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Transparent and Thermally Stable Urushiol Films by Fast Thiol–ene Curing

Shen

Zhang

2023

ACS Appl. Polym. Mater.

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Lacquer is well recognized in the coating industry thanks to its excellent performance, artistic value, and renewable properties. However, there exists difficulty in curing thick lacquer film due to its dark color attributed to the phenol oxidation and the inertness of internal double bonds that are persistent in the cured films, which also reduces the thermal stability of the obtained film. Meanwhile, the slow manual curing process also limits its largescale commercial use. To address the issues, in the current study, urushiol−urethane prepolymers were synthesized, characterized, and adopted as the foundation for transparent and thick lacquer film preparation through a fast and green thiol−ene click reaction with polymercaptan. By this mild and readily implemented method, flexible and transparent networked films based on renewable urushiol can be obtained with almost no film shrinkage. Moreover, the cross-linking density, modulus, and hydrophobicity of the films are also alterable, as validated by the differential scanning calorimetry, contact angle, and rheological measurements. More interestingly, the functionalization by mercapto groups not only stabilizes the double bonds remaining in the cured urushiol films but also endows the films with a good hydrophilicity. The high moduli of these films can be retained after repeated distortion under high temperatures, exhibiting an excellent thermal stability, which is incomparable with those of traditional lacquer films. Moreover, the urushiol-urethane prepolymer was demonstrated to well copolymerize with styrene as a macro-cross-linker for good film formation, exploring the application generality of this approach.

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Section: Resultsmentioning

confidence: 99%

Section: Preparation and Characterization Of The Upt Networkmentioning

confidence: 99%

Transparent and Thermally Stable Urushiol Films by Fast Thiol–ene Curing

Shen

Zhang

2023

ACS Appl. Polym. Mater.

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“…A wide range of biosorbents derived from algae, microorganisms, and plant residues have been proposed to remove toxic substances, including heavy metals [3,7]. However, the use of biosilica to remove metal ions from aqueous solutions has been poorly described in the literature [19,20], while the possibilities of using silica produced from synthetic precursors to remove such impurities have been widely reported [21][22][23]. Since SiO 2 has a relatively large specific surface area (SSA), the use of biosilica as a sorbent seems to be a good solution for the removal of pollutants from the environment.…”

Section: Introductionmentioning

confidence: 99%

Efficient Adsorption of Chromium Ions from Aqueous Solutions by Plant-Derived Silica

et al. 2022

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Nowadays, there is great interest in the use of plant waste to obtain materials for environmental protection. In this study, silica powders were prepared with a simple and low-cost procedure from biomass materials such as horsetail and common reed, as well as wheat and rye straws. The starting biomass materials were leached in a boiling HCl solution. After washing and drying, the samples were incinerated at 700 °C for 1 h in air. The organic components of the samples were burned leaving final white powders. These powders were characterized by powder X-Ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, dynamic light scattering (DLS), scanning electron microscopy (SEM), and low-temperature nitrogen sorption. The amorphous powders (biosilica) contained mainly SiO2, as indicated by FTIR analysis. Horsetail-derived silica was chosen for testing the removal of dichromate ions from water solutions. This biosilica had a good ability to adsorb Cr(VI) ions, which increased after modification of the powder with the dodecylamine surfactant. It can be concluded that the applied procedure allowed obtaining high purity biosilica from plant waste with good efficiency. The produced biosilica was helpful in removing chromium ions and showed low cytotoxicity to human endothelial cells, suggesting that it can be safely used in environmental remediation.

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