- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Large-scale preparation of rice-husk-derived mesoporous SiO2@TiO2 as efficient and promising photocatalysts for organic contaminants degradation
摘要： Mesoporous SiO2@TiO2 photocatalysts with application prospect for organic contaminants degradation were prepared by utilizing rice husk (RH), an easy-available bioresource, as the biotemplate. Structures and physicochemical properties of RH-derived SiO2@TiO2 photocatalysts were systematically characterized and discussed. Results indicate the RH-derived mesoporous and thermal-stable template, which can postpone the anatase-rutile phase transition of TiO2 at high temperatures, is mainly consisted of tightly compacted amorphous SiO2 nanoparticles. Optimized calcination temperature of 700 °C is positive for preparing the most active RH-derived SiO2@TiO2, which has the anatase phase, mesoporous structure, proper crystalline degree (grain size of 22.75 nm), specific surface area of 41.13 m2/g, and high ability in separating the photogenerated electron-hole pairs, for removal of Rhodamine B (RhB) in aqueous solutions under both the xenon lamp and visible light irradiation. Moreover, large-scale preparation, stable, and recyclable properties of the photocatalysts are also confirmed, which makes them as promising photocatalysts for practical application.
关键词： SiO2@TiO2 mesoporous structure,Biotemplate,Rice husk,Photocatalysis,Practical application
更新于2025-09-23 15:21:01
-
Structural and Quantitative Investigation of Perovskite Pore Filling in Mesoporous Metal Oxides
摘要： In recent years, hybrid organic–inorganic perovskite light absorbers have attracted much attention in the field of solar cells due to their optoelectronic characteristics that enable high power conversion efficiencies. Perovskite-based solar cells’ efficiency has increased dramatically from 3.8% to more than 20% in just a few years, making them a promising low-cost alternative for photovoltaic applications. The deposition of perovskite into a mesoporous metal oxide is an influential factor affecting solar cell performance. Full coverage and pore filling into the porous metal oxide are important issues in the fabrication of highly-efficient mesoporous perovskite solar cells. In this work, we carry out a structural and quantitative investigation of CH3NH3PbI3 pore filling deposited via sequential two-step deposition into two different mesoporous metal oxides—TiO2 and Al2O3. We avoid using a hole conductor in the perovskite solar cells studied in this work to eliminate undesirable end results. Filling oxide pores with perovskite was characterized by Energy Dispersive X-ray Spectroscopy (EDS) in Transmission Electron Microscopy (TEM) on cross-sectional focused ion beam (FIB) lamellae. Complete pore filling of CH3NH3PbI3 perovskite into the metal oxide pores was observed down to X-depth, showing the presence of Pb and I inside the pores. The observations reported in this work are particularly important for mesoporous Al2O3 perovskite solar cells, as pore filling is essential for the operation of this solar cell structure. This work presents structural and quantitative proof of complete pore filling into mesoporous perovskite-based solar cells, substantiating their high power conversion efficiency.
关键词： STEM-TEM,mesoporous,perovskite,pore filling,XRD
更新于2025-09-23 15:21:01
-
Two-photon pumped spaser based on the CdS/ZnS core/shell quantum dota??mesoporous silicaa??metal structure
摘要： The spaser (a plasmonic nanolaser) has rapidly advanced as a subwavelength light source candidate. Herein, we introduce a spaser based on a quantum-dot, mesoporous-oxide, and metal structure from top to bottom consisting of CdS/ZnS core/shell quantum dots, a mesoporous silica film (MSF), and an Au film, respectively. Two-photon pumping using femtosecond laser pulses at 800 nm creates amplified spontaneous emission at approximately 451 nm. The advantages of MSF as a dielectric gap layer are examined through numerical simulations. Measuring the dependence of the luminescence intensity on the average pump power confirms the occurrence of two-photon up-conversion luminescence.
关键词： spaser,two-photon pumping,mesoporous silica film,plasmonic nanolaser,quantum dots
更新于2025-09-23 15:19:57
-
Enhanced photocatalytic activity under visible light by the synergistic effects of plasmonics and Ti3+-doping at the Ag/TiO2- heterojunction
摘要： A heterojunction of plasmonic Ag particles on Ti3+-doped macro-/meso-porous TiO2 framework consisting of parallel microchannels, denoted as Ag/TiO2-x, has been fabricated by a simple microwave-assisted process employing vitamin C as the reducing agent for forming TiO2-x framework followed by photochemical deposition of Ag particles. Charge transport and recombination processes were detected through transient photocurrent responses. The visible-light photocatalytic hydrogen production rate and the apparent reaction rate constant of RhB photodegradation with 3%-Ag/TiO2-x catalyst are about 5.3 and 14.0 fold higher than those with the pristine macro-/meso-porous TiO2 framework, respectively. A mechanism based on the synergistic effects of Ag plasmonics and Ti3+-doping at the Ag/TiO2-x heterojunction is proposed, which consistently explains the high photocatalytic performance in hydrogen evolution and the improved photocatalytic decomposition of RhB under visible light. This study demonstrates the effective route to synthesize new heterojunction photocatalytic materials with multifunctional properties using low-cost and rapid microwave processes.
关键词： Macroporous/mesoporous TiO2 microchannel,Ag/TiO2-x heterojunction,Ti3+-doped TiO2,Photocatalysis,Surface plasmon resonance
更新于2025-09-23 15:19:57
-
Fluorescent hollow mesoporous carbon spheres for drug loading and tumor treatment through 980-nm laser and microwave co-irradiation
摘要： Hollow mesoporous particles for drug delivery and cancer therapy have attracted significant attention over recent decades. Here, we develop a simple and highly efficient strategy for preparing fluorescent hollow mesoporous carbon spheres (HMCSs). Compared with typical carbon materials such as fullerene C60, carbon nanotubes, reduced graphene oxide, and carbon nanohorns; HMCSs showed fewer effects on cell cycle distribution and lower toxicity to cells. Ten different drugs were incorporated into the HMCSs, and the maximum loading efficiency reached 42.79 ± 2.7%. Importantly, microwaves were found to improve the photothermal effect generated by HMCSs when combined with 980-nm laser irradiation. The cell killing and tumor growth inhibition efficiencies of HMCSs and drug-loaded HMCSs under co-irradiation with laser and microwaves were significantly improved compared with those under laser irradiation alone. After local administration HMCSs were only distributed in tissue at the injection site. HMCSs showed almost no toxicity in mice after local injection and could be completely removed from the injection site.
关键词： Hollow mesoporous carbon spheres,Low cytotoxicity,Fluorescent carbon dots,980-Nm laser and microwave co-irradiation,Improved cancer therapy
更新于2025-09-23 15:19:57
-
Applying neoteric MgTiO3-coated TiO2 nanoparticulate films as scaffold layers in perovskite solar cells based on carbon counter electrode for retarding charge recombination
摘要： MgTiO3-coated TiO2 mesoporous scaffold layers were fabricated and applied in perovskite solar cells (PSCs) based on carbon counter electrode (CCE), in which TiO2 mesoporous layers were treated with different concentration of Mg2+ solution. Compared with PSCs based on pure TiO2 mesoporous layer, the open circuit voltage (Voc) and circuit photocurrent density (Jsc) of MgTiO3/TiO2-based devices significant improved. Intensive characterizations including scanning electron microscopy, electrochemical impedance spectroscopy can confirm that the presence of MgTiO3 shell layer can’t only retard charge recombination at CH3NH3PbI3/TiO2 interface, but also have a strong effect on the perovskite film growth. Based on the optimized treating concentration of 0.10 M, power conversion efficiency (PCE) of 10.39% could be achieved for the hole-conductor-free PSCs with excellent long-term stability, suggesting immense potential for large-scale industrial production in the future.
关键词： Carbon counter electrode,Perovskite solar cell,MgTiO3/TiO2,Mesoporous scaffold layer,Hole-conductor-free
更新于2025-09-23 15:19:57
-
Realizing Synergistic Effect of Electronic Modulation and Nanostructure Engineering over Graphitic Carbon Nitride for Highly Efficient Visible-Light H2 Production Coupled with Benzyl Alcohol Oxidation
摘要： Photocatalytic H2 production based on g-C3N4 faces enormous challenging issues including limited visible-light absorption, poor separation and transfer abilities of photo-generated electron-hole pairs. Herein, we realize the synergistic effect of nanostructure engineering and electronic modulation with a supramolecular assembly mediated synthesis of heteroatom doped g-C3N4 hierarchical mesoporous spheres. The favorable doping site and possible effect on electronic structure are disclosed by DFT calculation with supporting experimental analysis. Impressively, S-doped g-C3N4 delivers a 13.2 times higher H2 production rate than bulk g-C3N4 under visible-light. More importantly, as the dual functional photocatalyst for H2 production and selective oxidation of benzyl alcohol, it can exhibit outstanding activity with a H2/benzaldehyde production rate of 3.76/3.87 μmol h-1, respectively. This work not only provide a new rationale for photocatalytic performance enhancement, but also shed new light on the highly efficient utilization of solar energy by coupling H2 generation with value added chemical production.
关键词： graphitic carbon nitride,hierarchical mesoporous spheres,DFT calculation,benzyl alcohol oxidation,photocatalytic hydrogen production
更新于2025-09-23 15:19:57
-
Co Incorporated Mesoporous Carbon Material Assisted Laser Desorption/Ionization Ion Source as an on-line Interface of in vivo Microdialysis Coupled with Mass Spectrometry
摘要： The combination of microdialysis and mass spectrometry (MS) provides the potential for rapidly monitoring diverse metabolites in vivo. Unfortunately, the high concentration of salt in biological microdialysates hindered the sensitive and on-line detection of these small molecular compounds. In this study, we synthesized Co incorporated mesoporous carbon material (Co-NC), and developed Co-NC assisted laser desorption/ionization (LDI) ion source as an on-line interface of in vivo microdialysis coupled with MS for direct analysis of diverse metabolites in microdialysates. The Co-NC could be used as matrix for surface assisted laser desorption/ionization mass spectrometry (SALDI MS) analysis of small molecular compounds, even under high concentration of salt conditions. The Co-NC possessed the adsorption ability for small molecular compounds, and it was believed that the adsorption ability of Co-NC might separate the analytes from the salt in microdialysates at a microscopic level, which might facilitate the desorption and ionization of the analytes and finally improved the salt-tolerance ability as matrix. Furthermore, the Co-NC assisted LDI ion source as a novel interface of in vivo microdialysis coupled with MS has been applied to the on-line monitoring of liver metabolites from the CCl4-induced liver injury rat model for the first time.
关键词： microdialysis,Co incorporated mesoporous carbon material,metabolites,mass spectrometry,laser desorption/ionization,salt-tolerance
更新于2025-09-23 15:19:57
-
Glutathione- and light-controlled generation of singlet oxygen for triggering drug release in mesoporous silica nanoparticles
摘要： A combined stimuli-responsive photosensitiser and drug release system based on mesoporous silica nanoparticles was prepared. This nanoplatform encapsulated molecules of a zinc(II) phthalocyanine substituted with a glutathione-cleavable 2,4-dinitrobenzenesulfonate quencher and doxorubicin linked via a singlet-oxygen-cleavable 9,10-dialkoxyanthracene linker. In the presence of glutathione (in mM range) and upon irradiation (λ > 610 nm), the phthalocyanine units were activated by detaching from the quenching component to emit fluorescence and generate singlet oxygen. The latter subsequently cleaved the 9,10-dialkoxyanthracene linker to trigger the release of a doxorubicin derivative. The glutathione- and light-controlled activation and drug-release processes on this nanoplatform were demonstrated in phosphate buffered saline. The activation in fluorescence emission by intracellular thiols was also shown inside HepG2 human hepatocellular carcinoma cells. Upon irradiation, the nanosystem exhibited high cytotoxicity due to the photodynamic effect of the activated phthalocyanine units, but the cytotoxic effect of the released Dox moieties was not notable probably due to their reduced cytotoxicity as a result of the pendant substituent and the low drug loading in the nanoparticles.
关键词： mesoporous silica nanoparticles,photosensitiser,photodynamic therapy,doxorubicin,drug release,glutathione,singlet oxygen
更新于2025-09-23 15:19:57
-
Surface Engineering of Low-Temperature Processed Mesoporous TiO <sub/>2</sub> via Oxygen Plasma for Flexible Perovskite Solar Cells
摘要： A major problem in the application of mesoporous TiO2 as an electron transport layer for flexible perovskite solar cells is that a high temperature sintering process is required to remove organic additives from the TiO2 layer. A facile oxygen plasma process is herein demonstrated to fabricate mesoporous structured perovskite solar cells with significant photovoltaic performance at low temperatures. When the low-temperature processed TiO2 layer is modified via oxygen plasma, the organic additives in the TiO2 layer that hinder the charge transport process are successfully decomposed. The oxygen plasma treatment improves the wettability and infiltration of the perovskite layer and also passivates the oxygen vacancy related traps in TiO2. Hence, the oxygen plasma treatment evidently enhances charge extraction and transport, thereby improving photovoltaic performance and decreasing hysteresis.
关键词： Mesoporous TiO2,Flexible solar cell,Oxygen plasma,Low-temperature processed TiO2,Perovskite solar cell
更新于2025-09-23 15:19:57