Search

• Superhydrophobic and antibacterial fabric was achieved by in situ growing ZIF-8 and PDMS coating. • Fabricated fabric demonstrated high oil/water separation capacity. • As-prepared fabric showed excellent antibacterial activity against E. coli and S. aureus. • Samples exhibited excellent good abrasion resistance and laundering stability. Facile construction of multifunctional fabrics with durability still remains a challenge in the past decade. In this work, we report a facile fabrication of non-fluorinated superhydrophobic and antibacterial cotton fabric surfaces via in situ growing zeolitic imidazolate framework-8 (ZIF-8) nanocrystals on cotton fibers under room temperature condition and subsequently coating with polydimethylsiloxane (PDMS). The surface morphology and chemical composition of treated fabric have been characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS). The as-prepared cotton fabric showed superhydrophobic property with a water contact angle (WCA) of 151.36° and a sliding angle of 3.6° and excellent antibacterial properties against E. coli and S. aureus. The durability of the superhydrophobic and antibacterial fabrics was evaluated by repeated washing and abrasion cycles. The as-prepared fabrics retained their excellent antibacterial property and superhydrophobicity after 300 cycles of abrasion and 5 cycles of washing. The robustness of superhydrophobicity and antibacterial activity made this method has wild application prospects in biomedical field in the future. [ABSTRACT FROM AUTHOR]

• Diatomite-supported birnessite–type MnO 2 were synthesized by two methods. • Mnx/DM-AO showed excellent performance for HCHO removal than Mnx/DM-MT. • The crystal defective, surface –OH and lattice oxygen were responsible for the reactivity. • The synergistic effect between diatomite and MnO 2 improved catalytic performance. Diatomite-supported birnessite–type MnO 2 (δ-MnO 2) with different loadings were synthesized through in-situ reduction method by methanol (Mnx/DM-MT) and hydrothermal reduction method by ammonium oxalate (Mnx/DM-AO), respectively. The as-synthesized catalysts were characterized by N 2 adsorption-desorption, X-Ray diffraction, transmission electron microscope, scanning electron microscope, Raman, H 2 -temperature programmed reduction, thermogravimetric, X-ray photoelectron spectroscopy, and in-situ diffuse reflectance infrared Fourier transform spectrometry, and then utilized to catalytic oxidation of formaldehyde at ambient temperature and low temperature (50–250 °C). Compared with the Mnx/DM-MT catalyst, the Mnx/DM-AO catalyst exhibited superior catalytic activity in degrading HCHO at ambient temperature and low temperature. The highly defective structure, abundant hydroxyl groups, rich lattice oxygen and Mn3+ species were responsible for the excellent performance of Mnx/DM-AO. Meanwhile, the Mnx/DM-AO still exhibited good stability obtained from the cyclic testing. In-situ DRIFTS analysis indicated that δ-MnO 2 provided the reactive site, while the diatomite carrier dispersed MnO 2 and also provides a small number of active sites. The synergistic effect between diatomite and δ-MnO 2 benefits the catalytic performance in removal HCHO. The advantages of high activity, low-cost and environment-friendly, suggested that Mn/DM-AO catalyst exhibits promising application foreground in catalytic oxidation of formaldehyde at the temperature from ambient to 250 °C. [ABSTRACT FROM AUTHOR]

• Catalytic C 6 H 6 oxidation over todorokite MnO 2 is reported for the first time. • The todorokite MnO 2 is more active than the reported transition metal oxides. • Proper Sm addition significantly improves the catalytic activity. • Adsorption capacity and strength of C 6 H 6 and activation of O 2 are discussed. Catalytic VOCs oxidation is primarily developed towards the synthesis of active, stable and economical materials that work efficiently at low temperatures. Herein, an active todorokite-type MnO 2 (T-MnO 2) was prepared for the catalytic oxidation of gaseous benzene for the first time and the effect of samarium (Sm) modification was investigated. The T-MnO 2 was much more active than the reported transition metal oxide counterparts, complete removal of 237 ppm of benzene achieved at a low reaction temperature of 175 °C and a very high space velocity of 120 L·g−1·h−1. According to ICP-OES, XRD and ATR, Sm existed as amorphous Sm 2 O 3 in SmMnO. Of all tested samples, Sm 0.01 MnO (atomic ratio of Sm/Mn was 0.01) performed the best, exhibiting 100% conversion for 229 ppm of benzene at 150 °C and above under 120 L·g−1·h−1, and almost no residual benzene was detected at 200 °C and above even under 240 L·g−1·h−1. According to C 6 H 6 -TPD, XPS, H 2 -TPR and O 2 -TPD, the origin of the excellent performance of the Sm 0.01 MnO came from it having a high benzene adsorption capacity, strong binding with benzene molecules and plenty of active surface oxygen. Moreover, the effect of concomitant water on catalyst activity was elucidated. [ABSTRACT FROM AUTHOR]

• In situ nitrogenization of the LiCoO 2 via RhB degradation was confirmed. • N doping provided the reused LiCoO 2 with more defect oxygen species. • The activity of the reused LiCoO 2 became better and better with cycling runs. • This study provides a new concept of recycling e-wastes to treat waste water. Recycling the wasted lithium-ion batteries for environmental catalysis is promising to control pollution since the electrode materials usually contain metal oxides showing good catalytic activities. Herein, the LiCoO 2 was synthesized and used to treat the simulated dye wastewater. In order to cope with the practical water pollution, the effects of rhodamine B (RhB) concentration, concomitant ions, solution pH, air blowing and reaction temperature were systematically investigated. The most important finding of this study is the in situ nitrogenization of the LiCoO 2 via RhB degradation, which offered the reused material a much better activity than the fresh one due to the formation of more defect oxygen species, and the activity of the reused LiCoO 2 became better and better with cycling runs. At the third time of usage, ~90% of RhB could be removed under the conditions of 0.2 g of catalyst, 50 mL of 5 mg·L−1 RhB solution and 30 °C whereas only ~60% of RhB was degraded over the fresh sample. The results of this study will also have scientific significance for the development of nitrogen-doped LiCoO 2 in other application fields. [ABSTRACT FROM AUTHOR]