Yaqin Rong,Wenjun Yan,Zhongde Wang,Xiaogang Hao,Guoqing Guan
Contact with trace heavy metal contaminants will also lead to extremely bad health influence on human body and aquatic life. Although various adsorbents have been synthesized for the recovery of heavy metal ions , most of them shows deficient adsorption capacity, sluggish uptake rate and low selectivity . In this study, a montmorillonite/polypyrrole (MMT/PPy) film was successfully synthesized by intercalating polymers PPy into the interlayer of MMT nanosheets for selective and rapid capture of Pb 2+ . The electroactive film has ultrahigh uptake capacity (1373.29 mg⋅g −1 ), which is much higher than most conventional Pb 2+ adsorbents. Meanwhile, it had an extreme selectivity towards Pb 2+ due to the MMT/PPy film can accurately identified Pb 2+ . Through characterization testing and data analysis, the selective and rapid uptake/release of Pb 2+ should be realized through three ways: (1) negatively-charged laminates of MMT can generate electrostatic attraction to Pb 2+ ; (2) -OH on the surface of MMT laminates can accurately identified and bonded with Pb 2+ (M-O-H↔ M-O-Pb); (3) PPy doped by PSS n- and protic acid can rapidly catch Pb 2+ (PPy + ·PSS n- +Pb 2+ +e - → PPy·PSS n- ·Pb 2+ ). Therefore, such a novel MMT/PPy nanocomposite film could has evident application prospect to remove Pb 2+ from various water bodies.
The efficient capture of radioiodine from the waste of nuclear industries is a growing priority for the safe development of nuclear energy. However, because the iodine adsorption rate of previously reported adsorbents is very slow, they are inadequate for use in an actual emergency such as radioiodine leakage in a nuclear accident. Herein, a nitrogen-rich covalent triazine–piperazine-based porous polymer (n-CTP) was successfully synthesized via a mild one-step solvothermal route. The large pore size and abundant N-heterocyclic groups (with a nitrogen content as high as 39.69%) of n-CTP are beneficial for the diffusion and adsorption of I2, and they have the ability to decrease the adsorption time. The ability of n-CTP to adsorb iodine vapor was examined, and the results show that n-CTP possesses a faster adsorption rate (1.58 g g−1 h−1) than most iodine-capturing covalent organic polymers (COPs), excellent iodine uptake capacity (4.19 g g−1), satisfactory selectivity, and can be reused for at least three cycles without a significant loss of iodine uptake. FT-IR and Raman analyses revealed that the mechanism of iodine capture is attributed to the charge transfer interactions between n-CTP and the guest iodine. In addition, n-CTP also exhibits high iodine capture capacity (2.88 g g−1) and fast adsorption rate in iodine solutions. Thus, n-CTP has the potential to be applied to the rapid removal and enrichment of radioiodine in spent fuel reprocessing and has the ability to prevent environmental contamination in the case of nuclear accidents.
Functional materials with good biocompatibility have been widely used in the study of genomics, proteomics and disease diagnosis, which has improved the progress of life science. In this paper, the material not only exhibited a strong affinity to the phosphate groups on the exosomal membrane due to the coexistence of Zr–O clusters and Ti 4+ , but also owned great hydrophilicity to reduce non-specific adsorption of contaminated proteins, achieving the separation and purification of exosomes from complex biosamples. The model exosomes extracted by ultracentrifugation (UC) were used to evaluate the feasibility of Fe 3 O 4 @UiO-66-NH 2 @PA-Ti 4+ capturing exosomes. The process of Fe 3 O 4 @UiO-66-NH 2 @PA-Ti 4+ capturing exosomes was simple to operate with a high recovery rate (97.3%) within a short time (5 min). Then Fe 3 O 4 @UiO-66-NH 2 @PA-Ti 4+ was further applied to capture exosomes in media and urine followed by the downstream proteomics analysis. 348 and 284 exosomal proteins were identified for cell medium and urine, respectively. This work shows great potential of the material for subsequent function research of disease-related exosomes by separating exosomes rapidly and efficiently.
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