A variety of liquid energy exists in papermaking engineering and has not yet been developed and utilized. In addition, for the papermaking industry, the presence of slime can seriously affect the quality of the finished paper and can lead to paper breaking. The current slime control strategies cannot completely solve the problem and also have some low toxicity. In this study, a method of self-powered sterilization of cellulose fibers by using triboelectric pulsed direct current is reported. A liquid–solid triboelectric nanogenerator (L–S TENG) was used to convert the liquid energy of nanocellulose suspension into electrical energy and convert this electrical energy into pulsed direct current for self-powered sterilization of cellulose fiber. A hydrophobic coating material is used as solid triboelectric material and electrode for sterilization. Driven by L–S TENG, the electrodes exhibited an excellent sterilization rate against four microorganisms including Escherichia coli, Aspergillus niger, Candida albicans, and Klebsiella pneumoniae, which from slime in the papermaking industry. This study could provide a basic research theory for liquid energy harvesting in the papermaking industry, and also provide a new strategy for pulp sterilization.
In this paper, a facile strategy is reported for the preparation of well‐dispersed Pt nanoparticles in ordered mesoporous silica (Pt@OMS) by using a hybrid mesoporous phenolic resin‐silica nanocomposite as the parent material. The phenolic resin polymer is proposed herein to be the key in preventing the aggregation of Pt nanoparticles during their formation process and making contributions both to enhance the surface area and enlarge the pore size of the support. The Pt@OMS proves to be a highly active and stable catalyst for both gas‐phase oxidation of CO and liquid‐phase hydrogenation of 4‐nitrophenol. This work might open new avenues for the preparation of noble metal nanoparticles in mesoporous silica with unique structures for catalytic applications. 相似文献
Manganese oxides supported on γ-Al2O3, amorphous SiO2, MCM-41, and TiO2 prepared by an impregnation method were used as heterogeneous catalysts for epoxidation of alkenes with 30 % H2O2 in the presence of NaHCO3 aqueous solution. The effect of support and manganese loading on their activity was studied. The 1.3-MnOx/γ-Al2O3 exhibited superior epoxidazing activity of styrene, compared with other supported MnOx. Hydrogen temperature-programmed reduction, UV–vis and ESR analyses suggested that Mn2+ (catalytic activity species) dominated in 1.3 % MnOx/γ-Al2O3 due to a strong interaction between MnOx and γ-Al2O3. Recycling studies showed the catalyst was a heterogeneous one and retained its activity after recycling four times. 相似文献
Temperature dependent synthesis of micro- and meso-porous silica employing the thermo-responsive homopolymer poly(N-isopropylacrylamide) or the random copolymer poly(N-isopropylacrylamide-co-acrylic acid) as structure-directing agent (SDA) and Na2SiO3 as silica source is proposed. The thermo-responsive character of the SDA provides the advantages including (1) temperature
dependent synthesis of microporous silica, hierarchically micro-mesoporous silica, and mesoporous silica just by changing
the aging temperature below or above the low critical solution temperature of the thermo-responsive SDA, and (2) elimination
of the thermo-responsive SDA from silica matrix by water extraction. The synthesis mechanism is discussed, and the effect
of the aging temperature and the weight radio of SDA/Na2SiO3 on the synthesis of micro- and meso-porous silica are studied. Microporous silica, hierarchically micro-mesoporous silica
and mesoporous silica with the surface area at 3.5−9.0 × 102 m2/g and the pore volume at 0.28−1.13 cm3/g and the average pore size ranging from 1.1 to 9.0 nm are synthesized. The strategy affords a new and environmentally benign
way to fabricate porous silica materials, and is believed to bridge the gap between the synthesis of microporous and mesoporous
silica materials. 相似文献
Binary nanoassembly was realized by mixing gold@polyaniline nanoparticles with diblock copolymers in the DMF/H(2)O system and the products present a controlled transformation from symmetrical shells into spatially distributed petal-like polymer shells on gold cores. 相似文献
Two new eudesmane derivatives, 1α,6β,9β-trihydroxy-eudesm-3-ene-1-O-β-d -glucopyranoside ( 1 ) and 1α,6β,9β-trihydroxy-eudesm-3-ene-1-(6-cinnamoyl)-O-β-d -glucopyranoside ( 2 ) were discovered from Merremia yunnanensis. The structures were elucidated by analysis of their spectroscopic data including HR-ESI-MS, 1D, and 2D NMR. It should be noted that this is the first report about structure elucidation and NMR assignment of compounds from M. yunnanensis. 相似文献
An overall carbon-neutral CO2 electroreduction requires enhanced conversion efficiency and intensified functionality of CO2-derived products to balance the carbon footprint from CO2 electroreduction against fixed CO2. A liquid Sn cathode is herein introduced into electrochemical reduction of CO2 in molten salts to fabricate core–shell Sn−C spheres (Sn@C). An in situ generated Li2SnO3/C directs a self-template formation of Sn@C. Benefitting from the accelerated reaction kinetics from the liquid Sn cathode and the core–shell structure of Sn@C, a CO2-fixation current efficiency higher than 84 % and a high reversible lithium-storage capacity of Sn@C are achieved. The versatility of this strategy is demonstrated by other low melting point metals, such as Zn and Bi. This process integrates energy-efficient CO2 conversion and template-free fabrication of value-added metal-carbon, achieving an overall carbon-neutral electrochemical reduction of CO2. 相似文献