BiOBr-based nanocomposite photocatalysts are used for removing the organic pollutants, but their poor adsorption/photocatalytic performances and the low potential for recycling limit their ...application. To solve the issue, herein we report a large-area recyclable CFC/BiOBr/ZIF-67 filter-membrane-shaped photocatalyst prepared by
in situ
growth of BiOBr/ZIF-67 nanocomposites on carbon fiber cloth (CFC). Fabrication process is based on hydrothermal synthesis of BiOBr nanosheets (diameter 0.5–1 μm) on carbon fiber cloth (as substrate material) and then a chemical bath route is used to grow ZIF-67 nanoparticles (diameter 300–600 nm)
in situ
on the surface of CFC/BiOBr. Resulted composite, CFC/BiOBr/ZIF-67, exhibits a high specific surface area (545.82 m
2
g
−1
) and a wide photoabsorption, accompanied by an absorption edge (~ 620 nm). In dark condition, CFC/BiOBr/ZIF-67 adsorbs bisphenol A (BPA) and orange 7 (AO7) within 60 min, respectively with 20.0% and 40.1% efficiency. This level of efficiencies are correspondingly 2.6 and 3.2 times more that of the bare CFC/BiOBr (7.6% for BPA and 12.4% for AO7). Under visible light irradiation, CFC/BiOBr/ZIF-67 can degrade 69.7% of BPA and 96.0% of AO7, in 120 min, which are, respectively, 1.3 and 1.8 times higher than the absorption efficiency of bare CFC/BiOBr (53.2% for BPA, 52.0% for AO7). When CFC/BiOBr/ZIF-67 is used as a filter membrane for photocatalytic removal of pollutants in flowing wastewater (AO7, rate: ~ 1.5 L h
−1
), 92.2% of AO7 can be decomposed after 10 filtering cycles. This study suggests CFC/BiOBr/ZIF-67 as a novel highly functional, recyclable and environmental friendly photo-driven membrane filter for purification and recovery of flowing surface waste waters.
Graphical abstract
Abstract
In this work, a hybrid coating (TSMA) was produced using tetraethyl orthosilicate (TEOS)/KH550/Styrene maleic anhydride copolymer (SMA) as raw materials. The coating was afterwards applied ...to modify recycled coir (r-coir) fibers via dip-coating. R-coir fibers reinforced ABS composites were then prepared and the reinforcing effect of fibers on the composite structure was investigated, as well. The r-coir fibers coated with TSMA were hydrolyzed in air for 3 days. The SiO
2
particles produced by sol-gel reaction of TEOS were used to connect KH550 and SMA to the surface of the fibers and form an organic-inorganic ‘armor’ structure. The successful surface modification of the r-coir fibers was proved via FTIR spectroscopic study and the improvement of their decomposition temperature was evidenced by TGA. Furthermore, the homogeneous dispersion of TSMA on the surface of r-coir fibers was observed via SEM. In addition, the tensile strength of single fibers was found to increase by 36.1%. According to the results, TSMA can be successfully homogenized on the fiber surface, enabling one to repair the damaged areas and improve the tensile strength of single fibers. Besides, good compatibility between r-coir fibers and ABS was revealed by contact angle measurements. Furthermore, the bending strength and elastic modulus of TSMA-modified r-coir fibers/ABS composites were improved by 6% and 27%, respectively. Therefore, the method of plant fiber modification proposed in present work provides a reliable way for effective reuse of r-coir fibers.
Integrated membranes with filtration and photocatalytic functions have been considered as an effective strategy for purifying flowing wastewater, but the design and preparation of high-efficiency and ...low-cost membranes is still of great urgency. Herein, we report efficient recyclable BiOBrxI1-x fibrous filter membranous photocatalyst prepared through the in-situ growth of BiOBrxI1-x solid-solutions with tunable band-gaps on carbon fiber cloth (CFC). The fabrication was performed via a facile dipping-solvothermal synthesis of BiOBrxI1-x solid-solutions nanoplates on CFC with different I/Br ratios in the precursor solution. With the increase of I/Br ratio from 0 to 4, CFC/BiOBrxI1-x solid-solutions exhibit a re-shifted in the photoabsorption edge from 420 to 620 nm, leading to the tuning of the band-gap from 2.49 to 1.81 eV. Under visible light illumination for 120 min, CFC/BiOBrxI1-x solid-solutions have the tuned photocatalytic activity, where CFC/BiOBr0.8I0.2 shows the highest degradation efficiency toward various antibiotics (such as levofloxacin (LVFX, 94.1%), ciprofloxacin (CIP, 94.5%), and tetracycline (TC, 98.9%)) as well as dyes (such as acid orange 7 (AO7, 91.4%). Especially, when CFC/BiOBr0.8I0.2 is used as a flexible membrane to a construct multi-grade unit for treating the flowing sewage, the degradation efficiency of LVFX goes up from 3.9% in the first grade to 96.2% in the tenth grade. Therefore, the present CFC/BiOBr0.8I0.2 not only possesses great potential as a flexible membrane-shaped photocatalyst for purifying the flowing sewage efficiently but also provides some insights for developing new types of purifying membranes and devices.
In-situ growth of BiOBrxI1-x solid-solutions was realized on CFC as filter-membrane-shaped photocatalyst for removing pollutants in flowing wastewater. Display omitted
•The in-situ growth of BiOBrxI1-x solid-solutions on carbon fiber cloth.•High photocatalytic activity owing to tunable band-gaps.•Good stability and simple recyclable process.•Filter-membrane-shaped photocatalyst for purifying the flowing wastewater.
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Metal-organic frameworks (MOFs) are prospective photocatalysts for removing pollutants. However, the large size of MOFs results in unsatisfactory photocatalytic performance, thus ...restricting their further usage. Herein, ultrasmall Ti MOF (NH2-MIL-125(Ti)) nanodots (diameter: < 10 nm) were prepared on carbon fiber (CF) (diameter: ∼7 μm) based MoS2 (thickness: ∼20 nm, length: ∼200 nm) via a facile method and used as an efficient and reusable photocatalyst. The weaved CF/MoS2/NH2-MIL-125(Ti) cloth (0.15 g, 4 × 4 cm2) shows good reusability with an easy reusing process. Compared with large size NH2-MIL-125(Ti) based sample, our well-prepared NH2-MIL-125(Ti) nanodots based sample shows the improved surface area (290.1 m2 g−1) and it can generate more reactive oxygen species (ROS), which enhance removal performance (81.1% levofloxacin (LVFX), 67.9% acid orange 7 (AO7), 94.3% methylene blue (MB) and 100% Cr(Ⅵ)) in 120 min. Additionally, the recycling test for 4 cycles indicates high stability. This work highlights the function of easy-recyclable NH2-MIL-125(Ti) nanodots-based heterojunctions in wastewater purification.
CFC/BiOBr/BiOI can be used as an easily recycled photocatalyst for removing various pollutants from wastewater under visible-light irradiation.
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•BiOI nanosheets decoration of BiOBr ...nanosheets on carbon fiber cloth;•High photocatalytic activity owing to two-component synergistic effect;•Good stability and simple recyclable process;•The application of CFC/BiOBr/BiOI as an easily recycled photocatalyst for removing pollutants from industrial wastewater.
Various semiconductor powders (such as bismuth oxybromide/bismuth oxyiodide (BiOBr/BiOI) nanojunctions) can photodegrade wastewater efficiently, but their practical application is limited by poor recovery performance. To address the problem, we report the construction of BiOBr/BiOI nanojunctions on flexible carbon fiber cloth (CFC) substrate as an easily recycled photocatalyst by the dipping-solvothermal-dipping-solvothermal four-step method. CFC/BiOBr/BiOI is composed of CFC substate and two layers of nanosheets, while BiOBr nanosheets (thickness: 10–30 nm, diameter: 200–400 nm) were grown in the inner layer and BiOI nanosheets (thickness: 50–80 nm, diameter:300–600 nm) were grown in the outer layer. CFC/BiOBr/BiOI (4 × 4 cm2) can effectively photodegrade 97.7% acid orange 7 (AO7), 91.3% levofloxacin (LVFX) and 97.8% tetracycline (TC) within 120 min under the illumination of visible-light, better than CFC/BiOBr (73.2% AO7, 71.6% LVFX and 81.6% TC). Furthermore, superoxide radical (•O2−) and hydroxyl radical (•OH) are the main active substances during removing LVFX by CFC/BiOBr/BiOI. Besides, CFC/BiOBr/BiOI can efficiently reduce 93.5% chemical oxygen demand (COD) concentration of acrylic resin production wastewater (ARPW) under visible-light illumination for 3 h, better than CFC/BiOBr (36.6% COD). Therefore, CFC/BiOBr/BiOI has broad application prospects in purifying wastewater as a new type of easily recycled photocatalyst.
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The development of recyclable photocatalyst with high adsorption and excellent photocatalytic performance has attracted considerable attention. Herein, we report a three-component ...photocatalyst by constructing porous amine functionalized zirconium metal organic framework (UiO-66-NH2) and broad photo-responsive AgI on flexible carbon fiber cloth (CFC). UiO-66-NH2 nanoparticles (200–400 nm) were in-situ grown on the surface of CFC (16.5 ± 0.5 μm, 4 × 4 cm2) by a solvothermal route, then AgI particles (50–100 nm) were synthesized on CFC/UiO-66-NH2 via a modified chemical bath deposition method. The obtained CFC/UiO-66-NH2/AgI can effectively adsorb 19.0% levofloxacin (LVFX) or 18.4% ciprofloxacin (CIP) in 60 min in the dark and degrade 84.5% LVFX or 79.6% CIP in 120 min under visible light irradiation. Furthermore, the filter-membrane-shaped CFC/UiO-66-NH2/AgI can be utilized to treat the flowing sewage (CIP, 10 mg/L, ~1 L/h), and the removing efficiency of CIP reached 71.0% after 10 grades. Therefore, this work demonstrates the huge application prospect of recyclable CFC/UiO-66-NH2/AgI with high adsorption and photocatalytic capacity in flowing sewage treatment under visible light illumination.
Metal-organic frameworks (MOFs) are prospective photocatalysts for removing pollutants. However, the large size of MOFs results in unsatisfactory photocatalytic performance, thus restricting their ...further usage. Herein, ultrasmall Ti MOF (NH
-MIL-125(Ti)) nanodots (diameter: < 10 nm) were prepared on carbon fiber (CF) (diameter: ∼7 μm) based MoS
(thickness: ∼20 nm, length: ∼200 nm) via a facile method and used as an efficient and reusable photocatalyst. The weaved CF/MoS
/NH
-MIL-125(Ti) cloth (0.15 g, 4 × 4 cm
) shows good reusability with an easy reusing process. Compared with large size NH
-MIL-125(Ti) based sample, our well-prepared NH
-MIL-125(Ti) nanodots based sample shows the improved surface area (290.1 m
g
) and it can generate more reactive oxygen species (ROS), which enhance removal performance (81.1% levofloxacin (LVFX), 67.9% acid orange 7 (AO7), 94.3% methylene blue (MB) and 100% Cr(Ⅵ)) in 120 min. Additionally, the recycling test for 4 cycles indicates high stability. This work highlights the function of easy-recyclable NH
-MIL-125(Ti) nanodots-based heterojunctions in wastewater purification.
This study aims to analyze the impact of Chinese political discourse translation practices on the formation of state image in the digital era, using Chinese diplomatic documents as illustrative ...material. Diplomatic documents, including diplomatic communiqués, play a crucial role in political propaganda and international communication, holding significant strategic value in international relations. Analyzing the processes and strategies involved in translating diplomatic documents allows for a deeper understanding of how different translation methods influence the portrayal of a state. The accuracy and cultural adaptation of diplomatic translation directly affect the perception of Chinese policies and the image of the state by foreign audiences. While literal translation may preserve the accuracy of the original, it does not always convey cultural context and political intentions. In contrast, free translation and cultural adaptation contribute to a better understanding and acceptance of political information and the state's image by the target audience. Thus, the translation practice of diplomatic documents is not only a linguistic process but also a crucial strategy for shaping the state's image. This study employs textual analysis methods and is grounded in translation theory to analyze the use of vocabulary and sentence structure in the translation of diplomatic documents. The research aims to identify translation strategies used and to uncover hidden national images. The findings indicate that different translation strategies significantly influence the formation of the national image. Literal translation maintains the accuracy of the original but may miss cultural nuances. Paraphrasing enhances the perception and understanding of the text. Cultural transformation facilitates better adaptation of the text to the local audience. The scientific novelty of this research lies in its empirical investigation based on the translation of political discourse to reveal the formation of the state's image. The research results can be applied in diplomacy, international communications, and intercultural interactions, providing empirical support and guidance on translation strategies to enhance the national image. The study underscores the importance of translating political discourse for shaping the national image in the digital era. Under the influence of national ideology, the translation of political texts requires reevaluation and a forward-looking approach. In the digital era, the translation of political texts should aim to maintain and strengthen the national image.
We investigated the horizontal migration and transformation of nitrogen in soil with oxalic acid and inhibitors (e.g., nitrification inhibitors, DMPP, urease inhibitors, and NBPT) under different ...soil water contents to provide a basis for the efficient utilization of nitrogen fertilizer in agricultural production in karst areas.
Four nitrogen fertilizers (e.g., ammonium bicarbonate, ammonium sulfate, ammonium chloride, and urea) were applied separately and combined with oxalic acid, DMPP, and NBPT. The ammonium and nitrate nitrogen contents in the different soil layers were measured. The soil columns were cultured through an indoor soil column simulation at water content levels of 30%, 40%, and flooded (50%) for 30 days.
Ammonium bicarbonate with inhibitors increased soil NH
-N content by 15.42-21.12%. Ammonium sulfate with oxalic acid or NBPT increased soil NH
-N content by 27.56-52.25% at 30% and 40% moisture content treatments, compared to ammonium sulfate alone. Urea with DMPP application significantly increased soil NH
-N content by 11.93-14.87% at 40% water content and flooded conditions. In all treatments, the NH
-N content in the soil treated with 30% water content of ammonium chloride with oxalic acid was the highest. The NH
-N content showed a decreasing trend with an increase in the water content. The NO
-N content in soil treated with ammonium bicarbonate and DMPP was higher than that treated with other nitrogen fertilizers at 30% moisture. The NO
-N content decreased with increased water content. Under all treatments, ammonium chloride with oxalic acid had the highest percentage of soil NH
-N and soil soluble inorganic nitrogen at 30% water content, with 55.29% and 55.97%, respectively.
Among the nitrogen fertilizer treatments, the soil NH
-N content increased in ammonium bicarbonate with DMPP or NBPT, ammonium sulfate with oxalic acid or NBPT, and urea with DMPP. The four nitrogen fertilizers with DMPP increased the soil NO
-N content. Nitrogen fertilizer combined with oxalic acid and inhibitors could effectively improve the effective use of nitrogen fertilizer.
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