Synthesis And Properties Of Metal Sulfide Aerogels

Aerogels are composed of interconnected three-dimensional solid network and a large number of pores,which have the advantages of low density,high porosity and large specific surface area.Metal sulfide aerogel is a new type of aerogel material,which not only has various advantages of aerogel,but also retains the unique properties of metal sulfide,so it has good prospects in many fields.However,most of the research on metal sulfide aerogels is concentrated in the fields of photoelectricity and photocatalysis,ignoring the application potential of their abundant multifunctional active sites in the fields of heavy metal ion adsorption and electrocatalysis.In this paper,we prepared a variety of metal sulfide cluster aerogels and explored their properties of heavy metal ion adsorption and electrocatalytic hydrogen evolution.The main contents are as follows:（1）A new CoMo₄Sn_0.25S₁₉ aerogel was prepared by[Mo₃S₁₃]^2-and[Sn₂S₆]^4-cluster through metathesis.Co²⁺ions were added to accelerate the gelation process.As a heavy metal ion adsorbent,Co Mo₄Sn_0.25S₁₉ aerogel has good affinity for a variety of soft Lewis acid heavy metal ions.The Hg²⁺maximum adsorption capacity of the aerogel is 240.89mg/g,which is mainly adsorbed on the surface of the aerogel through chemical adsorption and monolayer adsorption according to the fitting results of kinetics and isotherm model.The p H value of the heavy metal ion solution has a great effect on the adsorption performance of the aerogel.（2）Mo₄Sn₅S₂₄ aerogel was synthesized through the rapid metathesis reaction between[Mo₃S₇Br₆]^2-and[Sn₂S₆]^4-cluster,and rapid gelation was achieved.More adsorption active sites are retained without Co²⁺as the linker in the aerogel.The Hg²⁺maximum adsorption capacity of the aerogel is improved to 543.48 mg/g,and the adsorption rate is faster.In addition,the p H value of the solution has a weaker effect on the adsorption performance of the aerogel.As-synthesized Mo₄Sn₅S₂₄ aerogel has more excellent heavy metal ion adsorption performance.（3）Co₂Mo₃Sn₂S₁₅,Co₂Mo₃Sn₆S₁₇ and Co₂Mo₅S₁₅ ternary metal sulfide aerogels were prepared.We compared the electrocatalytic hydrogen evolution performance of as-prepared aerogels in acid electrolytes,and explored the effect of different components on the catalytic performance of aerogels.Among them,Co₂Mo₅S₁₅ aerogel shows better catalytic activity.Through tuning the component of the Co₂Mo₅S₁₅ aerogel,the aerogel catalyst with good electrocatalytic activity can be obtained.