Preparation Of Sulfur-rich Copolymer And Its Application In Ion Adsorption And Electrode Materials

As one of the most abundant elements in the nature,a major by-product of oil and natural gas refinery processes,“converting inorganic sulfur into organic materials”continues to be at the center of an extensive array of scientific research topics and remains a significant challenge.The discovery of reverse vulcanization makes it possibility.Reverse vulcanization reaction is environment friendly and 100%atom economy.However,the restricted choice of cross-linker and the elevated temperatures handicap further development of both the polymers and plastic products.Through investigation of relevant literature,it was found that sulfur-rich copolymers have important applications in the fields of lithium-sulfur batteries,supercapacitors,environmental protection,infrared optical materials,and so on.The purpose of this study is to prepare the novel sulfur-riched copolymer,and to explore its applications in heavy metal ions adsorption and supercapacitor.The main content of this paper is as follows:1.Using S8 and acrylamide?AA?,N-allyl acrylamide?PAA?,N,N-diallyl acrylamide?2PAA?as comonomers,prepared by reverse vulcanization reaction?S-co-AA?,?S-co-PAA?,?S-co-2PAA?three sulfur-rich copolymers.This series of reactions does not require the addition of a catalyst,and can be achieved at a lower reaction temperature.Nuclear magnetic analysis,infrared spectroscopy,scanning electron microscopy,and thermogravimetric analysis show that this series of copolymers have porous surfaces,a large number of amino groups and carbonyl groups in the molecular structure,and a single material structure.Through a series of adsorption experiments,the effects of initial ion concentration,pH value,adsorption time and other factors on the adsorption of heavy metal ions were studied.The results show that?S-co-AA?can adsorb four heavy metal ions such as cadmium,copper,lead and mercury in water,especially the adsorption capacity of cadmium and copper ions is strong,and the one-time removal rate is as high as 96.2%and 93.2%.?S-co-PAA?and?S-co-2PAA?have strong adsorption capacity for mercury ions in water,with one-time removal rates of 96%and 95.1%,respectively,and strong anti-interference ability.It proves that this series of sulfur-rich copolymers has application value in removing heavy metal ions in water.2.Using S₈ and dicyclopentadiene?DCPD?as comonomers,a sulfur-rich copolymer?S-co-DCPD?was prepared by reverse vulcanization reaction.Get sulfur-rich porous carbon material?SPC?.Scanning electron microscopy,nitrogen adsorption and desorption analysis,full pore analysis,X-ray diffraction,and Raman spectroscopy characterization showed that the material had a specific surface area of588.06 m² g^-11 and a multi-level pore structure.It showed a high sulfur content of18.16%.Through cyclic voltammetry?CV?and constant current charge and discharge?CP?tests,it was found that the electrode material showed good rate performance.It still has a better specific capacitance at a higher current density,and the capacitance retention rate is as high as 80%.This proves that the sulfur-rich porous carbon material has application prospects as a negative electrode material for supercapacitors.3.In addition,the production process of the catalytic cracking catalyst preparation process of ammonium-free water washing ion exchange process was studied.The ammonium-free ion exchange process was used to replace the conventional ammonium washing ion exchange process,and the effects of the new process on the physical and chemical properties,element composition and catalytic cracking performance of the heavy oil were investigated.The results show that compared with the conventional process,the new process has the same sodium reduction effect,and contributes to the improvement of the catalyst micro-reactivity,heavy oil catalytic cracking reaction activity,and anti-pollution performance.