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The omnichannel strategies buy-online-and-return-in-store (BORS) and buy-online-and-pick-up-in-store (BOPS) have attracted attention from both industry and academia. In practice, major retailers adopt BORS and BOPS both individually and jointly, which motivates us to explore when it is profitable for a retailer to adopt BORS or/and BOPS strategy. We formulate a stylised model that captures (1) consumers' uncertainty about product match, (2) the offline search cost for consumers, and (3) the cross-selling effect of the consumers' store visit. We find that the cross-selling benefit and the offline search cost have a significant impact on the retailer's optimal omnichannel strategy. When the cross-selling benefit is sufficiently low, adopting BORS alone is optimal for the retailer. When the cross-selling benefit is moderate and the offline search cost is high, adopting both strategies has a complementary effect, and it is optimal for the retailer to adopt both omnichannel strategies jointly. However, when the cross-selling benefit is sufficiently high, adopting both strategies could be less profitable to the retailer than adopting the BOPS strategy alone. Moreover, consumer surplus may decrease in this case, suggesting that adopting both omnichannel strategies could result in a lose-lose situation for both the retailer and the consumers. [ABSTRACT FROM AUTHOR]

Nanofiltration (NF) with adsorptive membrane technologies are one of the most promising methods for the efficient treatment of industrial wastewater having toxic heavy metal ions. The present investigation deals with the fabrication of nanocomposite Fe3O4@MXene membranes by self‐assembly of Fe3O4 nanoparticles (NPs) and two‐dimensional (2D) MXene nanosheets on the surface of cellulose acetate (CA) base membrane. The Fe3O4 NPs were found to be uniformly dispersed on the MXene sheet structure and thus expanded the 2D nanochannel of MXene. The water flux and the removal ratio of heavy metal ions by this nanocomposite membrane were found to improve significantly, compared to the virgin MXene membrane. Under the synergistic effect of layer sieving and the adsorption ability, the composite NF membrane was found to achieve a maximum of 63.2% for Cu2+, 64.1% for Cd2+ and 70.2% for Cr6+ removal from wastewater, respectively. Moreover, Fe3O4@MXene membrane also exhibited good recycling ability after washing by HCl solution. [ABSTRACT FROM AUTHOR]