No abstract

A series of novel 1,2,4-triazolo[4,3-a ]pyridine derivatives were synthesized from 2,3-dichloropyridine and hydrazine hydrate as starting materials by multistep reactions under microwave assistance, and their structures were characterized by 1 H NMR, MS, and elemental analysis. This method provides several advantages such as high yields, facile work-up, and environmental friendliness.

Oil spills and organic chemical leakage have caused serious environmental problems, calling for highly effective adsorbents at low cost. Superelastic and hydrophobic-oleophilic modified melamine foams with ultralow amounts of well-dispersed graphene were prepared via dip-coating. The composite foams showed high selectivity for adsorbing various organic chemicals from water and could be regenerated easily. Moreover, excellent adsorption capacity ranging from 80 to 170 times its own weight was found depending on the density of organic chemicals. These coated foams show great potential for continuous oil/water separation and oil fume removal.

Graphene aerogel (GA) has a large potential in many fields such as energy storage, catalyst support, and sensors. However, its poor mechanical property has restricted the wide application. In this work, superelastic and robust melamine/graphene composite sponges are prepared by constructing a dual‐network structure of melamine and graphene without any chemical additives. The strength of as‐prepared composite sponge at 50% strain can reach 40 times higher than that of controlled GA. After 50 compressive cycles, the strain and strength recovery ratios of composite sponge are about 97% and 90%, respectively. More importantly, the excellent compression performance combines with the good electrical conductivity of the graphene network enable it as a dynamic piezo‐resistive material, which can provide immediate responses to dynamic stresses and strains with different frequencies. Benefitting by these excellent performances, the dual‐network composite sponge shows a great potential application in the field of motion sensing.