Preparation And Performance Study Of Functional Nanocarbon Materials Based On Waste PET

As a widely used type of plastic in various fields,PET not only brings great convenience to people’s lives,but also poses increasingly serious environmental and economic problems due to the accumulation of waste PET in the surrounding environment.Faced with the increasing difficulty of traditional treatment schemes to meet people’s various requirements,the resource utilization of waste PET has become a focus of attention,among which carbonization treatment is considered one of the most promising resource utilization schemes in recent years.However,the carbonization method still faces problems such as low carbonization yield,poor product performance,and difficulty in further application.Therefore,how to obtain carbon products with better performance while improving carbonization yield and conducting research on their applications are currently the main directions that need to be explored.In response to the above issues,this article proposes for the first time the preparation technology of functional nano carbon materials based on waste PET alcoholysis products(GOPS).The specific work and main content are as follows:(1)Direct carbonization was carried out on PET after alcoholysis pretreatment,and the effects of different factors on the direct carbonization yield were explored.It was found that carbonization temperature and carbonization time had no significant impact.By using GOPS for direct carbonization,sheet-like carbon materials(SC)with special surface morphology were obtained.The factors affecting surface morphology were found to be:carbonization temperature>raw material properties>protective gas flow rate>heating rate=carbonization time.(2)A GOPS based functional nano carbon material(FCNS GOPS)with a large number of pores,high specific surface area,and pore volume(990.553 m2/g and 0.414 cm3/g)was successfully prepared using a one-step carbonization method.At the same time,the yield has also been significantly improved(reaching 27.2%).(3)A new method for co carbonization of polyester and biomass has been proposed for the first time.Successfully achieved co carbonization by mixing GOPS and sawdust in different proportions using one-step carbonization method.A sawdust and GOPS based functional nano carbon materials(FCNS-1:1)with wonderful specific surface area and pore volume(1275.817 m2/g and 0.692 cm3/g,respectively)was successfully prepared.Exploring the potential of its adsorbent application,it was found that it exhibited brilliant adsorption capacity(529.3 mg/g and 368.5 mg/g,respectively)for methylene blue(MB)and(MO),and adsorption rate(87%of adsorption was completed within the initial 30 minutes)Reusability(After 10 cycles,474.3 mg/g and 323.6 mg/g adsorption capacity still remaining,89.6%and 87.8%of the initial adsorption)and excellent decolorization ability(pigment containing wastewater is almost transparent after 3 hours of adsorption).(4)A method for preparing sandwich like multilayer stacked flexible stress sensors,using carbonized products as nano conductive fillers has been proposed.Successfully prepared WPU PEDOT:PSS/SC/WPU PEDOT:PSS sensor Polyurethane elastomer as the substrate,two layers of WPU-PEDOT:PSS conductive layer and a uniformly distributed SC powder layer in the middle serve as the electronic components of the sensor.The nanohybrid sequence provides adjustable strain sensitivity,stability,and tensile properties.The sensor exhibits great stability and sensitivity(GF=1.99-8.94),exhibiting a stable and sensitive response to small deformations.Tested the response of human body signals and intelligent packaging signals,It was found that sensors attached to the outer and inner sides of fingers can provide stable and accurate responses to bending,stretching,and compression signals from different angles.When faced with a short and rapid press signal input,the sensor can also accurately and quickly respond accordingly.It can also make a stable and rapid response to whether the packaging is opened.Above all,the different FCNS surfaces prepared in this article have a large number of micro and nano pores,exhibiting a high specific surface area and abundant oxygen functional groups on the surface.It has shown deep application potential in many fields such as environmental remediation,packaging,human application,etc.