Cage-Based Covalent Organic Framework for the Effective and Efficient Removal of Malachite Green from Wastewater.

A cage-covalent organic framework (COF)-TP {T = bis(tetraoxacalix[2]arene[2]triazine); P = piperazine}, a novel two-dimensional covalent organic skeleton substituted with a nucleophilic cyanuric chloride analogue, was synthesized by a simple polymerization process. Cage-COF-TP is advantageous owing to its good structural order, permanent porosity, and low preparation cost. This skeleton was employed as a cost-effective adsorbent for the intermittent adsorption of an organic dye from aqueous solutions.

2D graphene/FeOCl heterojunctions with enhanced tribology performance as a lubricant additive for liquid paraffin.

The purpose of this study is to prepare graphene/FeOCl (G/FeOCl) heterojunctions a microwave-pyrolysis approach and probe into the synergistic lubrication of G with FeOCl in liquid paraffin (LP). The morphology and chemical composition of specimens were analysed by utilizing scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) techniques. The tribological property of G/FeOCl was determined, and the interaction between the G/FeOCl heterojunction and friction pair was carried out through simulation calculations.

Crucial roles of graphene oxide in preparing alginate/nanofibrillated cellulose double network composites hydrogels.

In this study, a novel strategy to prepare sodium alginate (SA)/nano fibrillated cellulose (NFC) double network (DN) hydrogel beads with the aid of graphene oxide (GO) was developed. In comparison with the multi-step freezing-thawing method, this study employs a facile one-step freeze drying method with the presence of GO sheets. The crucial roles of GO were highlighted as an efficient nucleating agent of NFC and a reinforcer for the hydrogel.

Graphene Oxide Reinforced Alginate/PVA Double Network Hydrogels for Efficient Dye Removal.

Dually crosslinked graphene oxide reinforced alginate/polyvinyl alcohol (PVA) double network (DN) hydrogels were prepared via a facile freeze/thaw method followed by soaking in a Ca solution. The morphology and structure of the hydrogels were systematically examined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The effects of pH, dosage of hydrogel, adsorption time, and temperature on the adsorptive property of DN hydrogels towards methylene blue (MB) were also studied.

Partly reduced graphene oxide aerogels induced by proanthocyanidins for efficient dye removal.

In this study, a novel surface modified and partly reduced graphene oxide (PRGO) induced by mild oligomeric proanthocyanidins (OPC) was prepared for efficient dye removal. The in situ partial reduction, modification and assembly of GO sheets into OPC-PRGO aerogels were readily realized by a hydrothermal process. Systemically characterizations were performed to confirm the partial reduction and modification of GO by OPC.

Broadband ultraviolet to near infrared conversion in Eu,Nd co-doped SrAlO.

In this study, we investigated the quantum cutting (QC) mechanism in Eu-Nd-co-doped SrAlO microcrystals by fluorescence spectroscopy and decay lifetime analysis. In this material, the near-infrared (NIR) emissions of Nd in the range of 800-1200 nm were enhanced under the excitation of the Eu:4f → 4f5d transition radiation. The lifetime of the 5d level of Eu decreased with the increase in the Nd concentration.

Broadband near-infrared quantum cutting by Ce-Yb codoped YAG transparent glass ceramics for silicon solar cells.

Ce-Yb co-doped transparent glass ceramics containing YAG nanocrystals were prepared by a conventional melt-quenching method. Broadband near infrared quantum cutting was achieved in the glass ceramics and proved to be a cooperative down-conversion process. Under 460 nm excitation, F to 5d electronic transitions occurred in Ce and transferred their energy to two neighboring Yb.

Effect of polyethyleneimine modified graphene on the mechanical and water vapor barrier properties of methyl cellulose composite films.

A series of novel methyl cellulose (MC) composite films were prepared using polyethyleneimine reduced graphene oxide (PEI-RGO) as an effective filler for water vapor barrier application. The as-prepared PEI-RGO/MC composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, tensile test and scanning electron microscopy. The experimental and theoretical results exhibited that PEI-RGO was uniformly dispersed in the MC matrix without aggregation and formed an aligned dispersion.