Constructing S-scheme heterojunction derived from metal-organic frameworks (MOFs) with high photoredox ability and boosted charge separation efficiency is promising in photocatalytic wastewater treatment. Herein, the MOF-BiOCl composite composed of BiOCl nanosheets and rod-like Bismuth-MOF (CAU-17) as the bismuth source precursor was prepared in situ via a halogenation process. Rational coupling the MOF-BiOCl with MoS2 nanosheets, an S-scheme heterojunction with enhanced photocatalytic tetracycline (TC) degradation efficiency was constructed. The optimized MOF-BiOCl/MoS2-3 composite exhibited the highest TC degradation rate (90% in 20 min). The improvement of photocatalytic degradation is mainly due to i) in situ synthesis of BiOCl nanosheets derived from Bismuth-MOFs avoided the aggregation of individual BiOCl nanosheets and preserved the ultrahigh porosity and specific surface area of the MOFs which generated more adsorption sites; ii) driven by the formed internal electric field, the charges followed an S-scheme transfer rout which retained the highest redox potential; iii) the 2D/2D BiOCl/MoS2 nanosheets geometry provided more intimate interfacial contacts which accelerate the charge separation and migration. This work offers an ideal strategy for constructing the effective heterostructure photocatalyst in the photocatalytic wastewater treatment. 

2D/2D Bi-MOF-derived BiOCl/MoS2 nanosheets S-scheme heterojunction for effective photocatalytic degradation

Cellulose of bacterial origin, known as bacterial cellulose (BC), is one of the most versatile biomaterials that has a huge potential in tissue engineering due to its favourable mechanical properties, high hydrophilicity, crystallinity, and purity. Additional properties such as porous nano-fibrillar 3D structure and a high degree of polymerisation of BC mimic the properties of the native extracellular matrix (ECM), making it an excellent material for the fabrication of composite scaffolds suitable for cell growth and tissue development. Recently, the fabrication of BC-based scaffolds, including composites and blends with nanomaterials, and other biocompatible polymers has received particular attention owing to their desirable properties for tissue engineering. These have proven to be promising advanced materials in hard and soft tissue engineering. This review presents the latest state-of-the-art modified/functionalised BC-based composites and blends as advanced materials in tissue engineering. Their applicability as an ideal biomaterial in targeted tissue repair including bone, cartilage, vascular, skin, nerve, and cardiac tissue has been discussed. Additionally, this review briefly summarises the latest updates on the production strategies and characterisation of BC and its composites and blends. Finally, the challenges in the future development and the direction of future research are also discussed.

/pdf/bacterial-cellulose-based-blends-and-composites-versatile-2eudygti.pdf

Bacterial Cellulose-Based Blends and Composites: Versatile Biomaterials for Tissue Engineering Applications

Experimental study on the suppression of coal dust explosion by silica aerogel

Photocatalytic CO2 reduction with H2O into hydrocarbon fuels represented an appealing approach to mitigate the energy crisis and greenhouse effect. However, isolated BiOBr (BOB) usually possessed rapid recombination of photogenerated carriers and low solar energy utilization, which restricted the elevation of photocatalytic performance. Herein, a direct Z-scheme porous N-rich g-C3N5/BiOBr (pCN/BOB) photocatalyst was fabricated through in situ hydrothermal approach. Furthermore, benefiting from Z-scheme heterojunction and tight surface contact, the pCN/BOB exhibited remarkably enhanced photoreduction ability of CO2 under visible light. Specially, 10% pCN/BOB exhibited the optimized photocatalytic performance for CH3OH production (3.08 μmol·g−1·h−1), approximately four times that of isolated BOB, whose improved photocatalytic performance was ascribed to the separation of photoinduced carriers by Z-scheme heterojunction and intimate interface contact. Meanwhile, the photogenerated charge transfer mechanism was calculated by work function calculation. Moreover, pCN/BOB exhibited good reusability for photocatalytic CO2 reduction. This work provided an efficient strategy for designing and preparing the high-efficiency photocatalysts for converting solar energy. 

Constructing direct Z-scheme heterojunction g-C3N5/BiOBr for efficient photocatalytic CO2 reduction with H2O

Cs0.33WO3/(t-m)-BiVO4 double Z-type heterojunction photothermal synergistic enhanced full-spectrum degradation of antibiotics

A facile pore size controlling strategy to construct rigid/flexible silica aerogels for super heat insulation and VOCs adsorption

Adsorption and photocatalytic degradation are effective ways to remove pollutants from water and achieve purification effect. In order to obtain composite aerogels with high adsorption capacity and visible light photocatalytic performance, a new type of Ag/AgBr/[email protected]2 composite aerogels (ABIS) was prepared by in-situ synthesis and supercritical drying. It has been proved that the pore size, pore volume and specific surface area of the composite aerogels can be effectively improved by using N, N-dimethylacetamide (DMAC) as pore expanding agent. The as-prepared Ag/AgBr/[email protected]2 composite aerogels with large pore volume, large pore size and uniform pore network structure not only showed high adsorption capacity for tetracycline, but also exhibited high separation and migration efficiency of photo-generated carriers, thereby being capable of reducing the recombination rate of photo-generated electron-hole pairs. Especially, the composite aerogel ABIS-2-N2 with loading 0.01 mol% Ag/AgBr/AgI and adding DMAC as pore-expanding agent, showed the highest adsorption/photocatalytic degradation efficiency for antibiotic tetracycline under visible light, and meanwhile exhibited high performance of photocatalytic degradation of tetracycline and recycling stability in the range of pH= 2–10. The superoxide anion (·O2-) was proved to be the main active substance to degrade tetracycline by the active substance capturing experiment. This work provides a new effective strategy for preparing composite aerogel materials with large pore volume, large pore size and adsorption/photocatalysis synergistic action, and the as-prepared composite aerogel will have important application value in the field of water purification. 

Construction of a novel Ag/AgBr/AgI@SiO2 composite aerogel with controlled pore structure: efficient removal of tetracycline by adsorption/photocatalysis synergism under visible light irradiation

Construction of a Novel Highly Porous Biobr/Csxwo3@Sio2 Composite Aerogel: Adsorption/Self-Heating Photocatalytic Synergistic Degradation of Antibiotics and Mechanism Study

Synthesis and characterization of curcumin/MMT-clay-treated bacterial cellulose as an antistatic and ultraviolet-resistive bioscaffold

Synthesis of a novel multifunctional montmorillonite/L-malic-acid/curcumin/bacterial cellulose hybrid nanofilm with excellent heat insulation, antibacterial activity and cytocompatibility

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