Design And Synthesis Of Cu-BTC Composite And Study On Its Adsorption Desulfurization Performance

Metal-organic Frameworks?MOFs?is a kind of novel organic-inorganic hybrid crystal materials by coordination bond that composed by metal?or metal clusters?and organic ligands.Most MOFs have some excellent characteristics like high porosity,structural flexibility and versatile chemistry,which lead to them have a promising prospect in the field of adsorption/separation and catalysis.Meanwhile,the researches of MOFs composited with other materials such as carbon,metal oxide and magnetic nanoparticles are increasing currently.It is a research trend for hybrid materials to design and compose multi-functional composites.The outcome of sulfur compounds in gasoline after combustion is one of the main pollution,and find some effect way to remove these sulfur compounds is a hot topic.Adsorptive desulfurization as a new technology has a broad development prospect.Nowadays,in the field of adsorptive thiophene,MOFs like Cu-BTC have various of researches.The huge surface and porosity,appropriate pore size and adsorptive site of MOFs,leading to the higher adsorptive capacity than zeolite and molecular sieve.According to the above research background,we design and compose a series of Cu-BTC composited with hydroxylated graphene to aim at improving the adsorptive capacity and stability of adsorbent.We choose thiophene as target sulfur compound and carry out a batch of adsorptive testes to measure the adsorptive capacity and stability.When the content of hydroxylated graphene reaches to 6%,the value of adsorptive capacity reaches its highest point?35.6 mg-S/g?that was 1.48 times than virgin Cu-BTC.In addition,the adsorptive capacity can maintain a high level after five time cycles.Meanwhile,MOFs are mainly in the form of powder,and always in the face of the problem that it is inconvenient to recover after achieving the adsorption.Consequently,we also design and compose the Fe₃O₄@Cu-BTC core-shell nanoparticles to solve above problem by using an external magnetic field.We successfully gain two kinds of different Cu-BTC shell thickness through controlling the time of reaction.We choose thiophene as target sulfur compound and carry out a batch of adsorptive testes and external magnetic field to measure the adsorptive capacity,stability and recovery.The core-shell structural composite shows a high adsorptive capacity and stability and can recover in several seconds by using external magnetic field.