Construction of 2D-2D TiO_2 nanosheet/layered WS_2 heterojunctions with enhanced visible-light-responsive photocatalytic activity

Constructing nanocomposites that combine the advantages of composite materials,nanomaterials,and interfaces has been regarded as an important strategy to improve the photocatalytic activity of TiO2.In this study,2D‐2D TiO2 nanosheet/layered WS2(TNS/WS2)heterojunctions were prepared via a hydrothermal method.The structure and morphology of the photocatalysts were systematically characterized.Layered WS2(~4 layers)was wrapped on the surface of TiO2 nanosheets with a plate‐to‐plate stacked structure and connected with each other by W=O bonds.The as‐prepared TNS/WS2 heterojunctions showed higher photocatalytic activity for the degradation of RhB under visible‐light irradiation,than pristine TiO2 nanosheets and layered WS2.The improvement of photocatalytic activity was primarily attributed to enhanced charge separation efficiency,which originated from the perfect 2D‐2D nanointerfaces and intimate interfacial contacts between TiO2 nanosheets and layered WS2.Based on experimental results,a double‐transfer photocatalytic mechanism for the TNS/WS2 heterojunctions was proposed and discussed.This work provides new insights for synthesizing highly efficient and environmentally stable photocatalysts by engineering the surface heterojunctions.

The Research of the Localization Marketing Strategy of Amazon in Germany

Amazon Germany has formulated a series of marketing strategies based on the shopping habits of German consumers and it has achieved success.This article summarizes the current marketing strategies of Amazon in Germany,and explores the key factors for the success of this marketing strategy.By comparing with other e-commerce platforms,this article critically analyzes the innovation and deficiency of Amazon in Germany.

Comparative Analysis of the Effects of False Low-Price Marketing Strategy on Multiple Platforms

In order to make full use of the characteristics of commodity prices,merchants on e-commerce platforms have adopted the low-price marketing strategy.Regular promotional discounts can bring new vitality to the commodity sales market,but extreme discount marketing methods would lead to serious impacts on the sales of competing products,thus affecting the stable development of the online shopping market.The sales data of four electrical products using the false low-price marketing strategy on three e-commerce platforms(Taobao,JD,and Amazon)were used in this study.The sales data from different e-commerce platforms and different time periods were analyzed,and one-way ANOVA was used on the factors affecting the effect of marketing strategy.The results showed that there is a significant difference between the direct marketing of high-priced products and low-priced products on Taobao;the difference between the marketing effects of high-priced products and mid-priced products on JD and Amazon is significant.This analysis would help businesses formulate reasonable marketing strategies and promote the stable development of the online shopping market.

In situ decorating the surface and interlayer of montmorillonite with Co_(0.5)Ni_(0.5)Fe_(2)O_(4) nanoparticles: A sustainable, biocompatible colorimetric platform for H_(2)O_(2) and acetylcholine

Originated from nature and used for nature is a way of sustainable development.In this work,montmorillonite(MMT),a natural two-dimensional(2D)layered mineral,the surface and interlayer of which were nano-decorated by chemical synthesis technique was applied in biological detection field.Magnetic ferrite(Co_(0.5)Ni_(0.5)Fe_(2)O_(4))was anchored on the surface and intercalated in the interlayer of montmorillonite,which served as a competitive candidate of enzyme mimics.Cytotoxicity test toward HUVEC and Hela cells verified the good biocompatibility of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT,guaranteeing its safety in biological applications.Based on the peroxidase-like activity of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT,a colorimetric sensing platform for H_(2)O_(2) was established by a facile mix-anddetect approach with the detection limit of 0.565μM(3σ/slope).It was implied that the peroxidase-like activity of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT was originated from generation of·OH and·O_(2)–produced from catalytic decomposition process of H_(2)O_(2).Coupled with cascaded catalytic reactions of ACh,a facile and efficient sensing platform for ACh with satisfactory anti-interference ability was established.Thus,all these remarkable features highlighted the superiority of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT,and endowed it with a powerful competitiveness in the fields of environmental assessing,biosensing,and disease monitoring.