Study On The Adhesion Mechanism And Application Of KGM Carbon Nanotube Aerogels

China is currently the world's most populated country and experts'forecasts the population to reach 1 billion 600 million by 2030.The per capita land area will be reduced to 0.008 square kilometers,far from the world's 0.3 square kilometers per capita.As a result of the population growth,man-made development and destruction,all kinds of resources on land are becoming scarcer.Based on scientific outlook reports on development and sustainable development,to meet the growing population of more than one billion with regards to food and fresh water demand,the adsorption of nano technology and other modern high technology is important.In addition,rational development and utilization of marine resources,repeated water recycling,water pollution governance,and utilization of sewage are the future of marine resources development.Konjac glucomannan(KGM)is a kind of natural macromolecule polysaccharide which can be improved by the addition of alkali and heating in the sol state.In this paper,konjac powder and carbon nanotubes aerogels was prepared and the mechanical and physical properties were tested.The simulation of KGM-carbon nanotube aerogels was also tested via adsorption test.The main research contents and results are as follows:1?Konjac glucomannan single wall,double wall,multi walled carbon nanotube aerogels were prepared and examined.The results showed that the addition of single wall,double wall,multi walled carbon nanotubes to the KGM composite sol better supported the weight of heavier objects.Shear viscosity and shear rate flow curve of all KGM sol deviated from the linear relationship of power law model ?=KYn.The pseudoplastic nature of the single wall and double wall composite fluid increased with the increase in concentration,the apparent viscosity also increased.Apparent viscosity of the fluid decreased with the increase in the concentration.The dynamic frequency scanning(DSC)showed that the samples with different ratios of the composite sol were larger with a wide linear range.At low frequencies,the loss modulus of KGM with single wall and double walled carbon nanotubes composite sol was higher than that of the storage modulus.The texture data showed that different concentrations of deacetylation of KGM by single and double walled carbon nanotube composite gel were similar when compressed,but the results obtained from elasticity and cohesiveness of acetylated KGM-single and double walled carbon nanotubes were twice higher.2.Studies on the mechanical properties and physical properties of konjac aerogels with different groups of carbon nanotubes were also carried out.The results showed that after the addition of hydroxyl and carboxyl carbon nanotubes,the KGM composite sol better supported weights several times more than its own weight,but the lower the better.Shear viscosity and shear rate results of all KGM in the sol deviates from the linear relationship between the flow curves in Power Law model ?=KYn which indicates the pseudoplastic nature of the fluid.The dynamic frequency scanning(DSC)showed that the samples with different ratios of the composite sol were larger,and all the samples had a wide linear range.At low frequencies,the loss modulus of KGM hydroxyl and carboxyl carbon nanotubes(CNTs)composite sol was higher than that of the storage modulus.It can be seen from the texture data that the KGM composite gels with no carbon nanotubes were lower than those of KGM composite gels with carbon nanotubes.3.The results of carboxyl carbon nanotube-konjac aerogel used as adsorbent for the adsorption of methyl orange solution from the standard curve,pH,ionic strength,kinetics,thermodynamics experiment,adsorption capacity of carbon nanotubes-konjac aerogels for methyl orange,the following conclusions were drawn:(1)As the pH increased,the adsorption capacity decreased gradually from high to low.At pH=7,it gradually increased with the increase of pH value.When pH=3,the adsorption capacity was the highest,which was 28.6 mg/g;when p H=7,the minimum adsorption amount was 19.63mg/g.(2)The experiments on the effect of ionic strength on the adsorption of Cacl2 solution was found to have little effect on the adsorption of methyl orange,and when the concentration of NaCl was less than or equal to 0.20mol/L.Hydroxylation of multi walled carbon nanotube aerogels for the adsorption of methyl orange konjac was uniform when the NaCl concentration was increased,with an adsorption amount of 6mg/g.When the concentration of NaCl was 0.20 mol/L,the adsorption capacity increased rapidly reaching 12mg/g.(3)The adsorption time and isothermal adsorption test showed that the adsorption efficiency increased with time and reached its maximum value at 300min.The adsorption behavior was mainly dependent on the physical adsorption and the adsorption process accords with the pseudo second order kinetics equation and the Freundlich isotherm adsorption model.