Desalination and Water Treatment
·
2024
·
IF 1
Jingbo Ni,Ruyi Liu,Changhao Yan
The surface aldehyde assembled polystyrene microspheres (PS-CHO) were synthesized via the copolymerization of styrene and acrolein and characterized by Fourier-transform infrared spectroscopy and transmission electron microscopy. Some characteristic parameters, such as specific surface area, pore diameter distribution and zeta potential, were also determined. The content of aldehyde groups in the PS-CHO microspheres was inferred through potentiometric titration. Adsorption of uranium(VI) from an aqueous solution was investigated in a series of variable experiments. Effect of pH value, ionic strength, adsorbent dose, contact time and temperature on uranium(VI) adsorption were also discussed. Results showed that the optimum condition was the temperature of 313 K, 0.4 g L –1 of adsorbent dosage, pH value of 6.0 for 20 mg L –1 of uranium(VI) concentration. The maximum removal efficiency of uranium(VI) ions was 92.13%. Kinetic studies certified the pseudo-second-order was the best-suited model and the fitting linear plot of the intraparticle diffusion model did not pass the origin, indicating that chemical sorption was the rate-determining step of the adsorption mechanism rather than mass transfer. Also, the Elovich equation was consistent with the experimental data, meaning chemical interactions between microspheres and adsorbates. The adsorption capacity at the equilibrium of PS-CHO microspheres was estimated to be 46.07 mg g –1 at 313 K. Furthermore, about 96% of adsorbed uranium(VI) could be recovered by laconic perchloric acid treatment, suggesting the stability and reusability of PS-CHO microspheres.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 59
·期 13
·1390-1398
·
IF 0
Yaochen Zheng,Peng Song,Shaoxiang Liu,Mengqing Wu,Hui Xu,Chenghui Qiao,Jian Liu,Zhengguo Gao,Qingfu Ban
Spiroacetal moieties containing linear telechelic polymers (LTPs) with two terminal epoxy groups were facilely synthesized via the successive thiol-ene and thiol-epoxy click additions. The LTPs were incorporated into epoxy matrix to fabricate the transparent and toughening thermosets. In term of the miscibility of epoxy with the adduct of ethanedithiol and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane (BTU), it is proposed that the size of the formed nanostructures was small enough to allow light penetrate. Therefore, the modified thermosets were transparent, which was further confirmed by small-angle X-ray scattering (SAXS) measurements. The LTPs with an alternating structure of rigid spiroacetal moiety and soft thioether could formed heterogeneous crosslinked networks (HCNs) and obviously toughen epoxy thermosets. Flexural strength increased from 1.06 GPa for neat epoxy to 2.09 GPa for toughening thermosets modified with 15 wt% LTPs. The stress field intensity ( K IC ) value reached up to 3.93 by more than 125% compared with that of the control sample (1.75). This work uncovered the role of HCNs on performance and paved a way for technological advances toward transparent and toughening materials in epoxy thermosets. Graphical
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Tao Liu,Jingying Peng,Jing Liu,Xiaolong Hao,Chuigen Guo,Rongxian Ou,Zhenzhen Liu,Qingwen Wang
Carbon fiber reinforced polymer composites (CFRPs) have been widely applied in various high-tech fields because of their superior performance. However, with the increasing consumptions of CFRPs, the nondestructive recycling of expensive carbon fibers (CFs) and the reduction of fire-hazards are highly desirable for the sustainable and safe utilization of CFRPs. Herein, a fully recyclable CFRPs with high flame retardance was newly designed by incorporating the vanillin-terminated phosphazene monomer (HVP) into the polyimine binder material. The six-functional HVP monomer makes the polyimine thermosets have a high crosslinking density and high P/N content, thereby ensuring the excellent flame retardancy and mechanical performances of the resulted composites. And the preparation of this kind of composites just need simple hot-pressing at lower temperature and shorter time, which is more energy-saving and efficient. Owing to the degradable imine bonds, the nondestructive closed-loop recycling of CFs and HVP monomers from the composites are achieved under mild conditions, which is extremely vital to preserve the structure of virgin CFs and HVP functional monomer . The regenerated CFRPs displayed same performance with that of fresh ones, and it also could be reprocessed and repaired within few minutes at elevated temperatures. More importantly, due to the rational combination of cyclophosphazene and imine bond, the excellent synergistic effect of gas phase and condensed phase during combustion endows the composites with superior flame retardancy . This work prepared bio-based recyclable, flame-retardant CFRPs, offering a green, sustainable and fire-safe strategy for designing eco-friendly high-performance composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Chunle Wei,Jian Zhang,Jing Shi,Xiuhai Gan,Deyu Hu,Baoan Song
A series of compounds with potential activity to induce plant resistance was synthesized from indole and thiol compounds and methodically evaluated for antiviral activity. The results indicated that some of the synthesized compounds had high antipotato virus Y (PVY), anticucumber mosaic virus, and antitobacco mosaic virus activities. Notably, compound D21 exhibited the best activity against PVY among these compounds in vivo, and the 50% effective concentrations (EC50) of protection activity is 122 μg/mL, which was distinctively better than the corresponding values for ribavirin (653 μg/mL), Ningnanmycin (464 μg/mL), and Xiangcaoliusuobingmi (279 μg/mL). Interestingly, we found that the protection activity of D21 was associated with improvement of chlorophyll content and defense-related enzyme activities. Moreover, D21 could trigger the malate dehydrogenase (MDH) signaling pathway, as further confirmed by the MDH activity evaluation. Hence, D21 can protect plants against viral activity and has potential as a novel activator for plant resistance induction.
研究领域:
植物科学
·
病毒学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）