Preparation And Adsorption Mechanism Of Masson Pine Bark Nanosorbent

In wood processing,bark is often treated as waste.A large amount of bark is discarded,which wastes resources.What's more,it pollutes the environment.Therefore,conducting research on high-value use of bark can not only effectively reduce some of the pollution caused by bark and other agricultural and forestry wastes,but also solve part of the problem of resource shortage and generate high value-added use.At the same time,the rapid development of modernization has made water pollution increasingly serious,and heavy metal pollution in water bodies has become serious.How to effectively control heavy metal pollution has become a common concern.Starting from the Pinus massoniana bark,this paper analyzed the structure and composition of the Pinus massoniana bark.The lignin content of Pinus massoniana bark is about 50%and the sugar content is 24.44%.Then,the bark of Pinus massoniana was treated by dissolving p-toluenesulfonic acid,and the nano lignocellulose of Pinus massoniana bark was first obtained.The specific operation is as follows.The raw materials are put into 100 mL p-toluenesulfonic acid solution with a concerntrationof 60%.And the reaction is performed for 1 hour under the conditions of heating and stirring in a water bath at 80?.Filter while still hot and wash the filter residue to neutral.The filter residue dialysis bag for 7 days,and then homogenized for 20 stages by microfluidization.The resulting sample was the nano-lignocellulose of the masson pine bark.After two-step processing of p-toluenesulfonic acid and microfluidizer,the average height of the sample reached about 15 nm and the maximum was not more than 60 nm.It can be clearly seen that the sample contains nano-level lignin and Cellulose.Among them,nano-lignin shows a round or quasi-circular shape,and nano-cellulose shows a short stick shape.The nano lignocellulosic aerogels of the masson pine bark were prepared under different freeze-drying conditions by using the lignin cellulose of the masson pine bark.The physical properties of the lignocellulosic aerogels of Pinus massoniana bark were analyzed and the adsorption properties were explored.It was found that the maximum pore size of the samples treated with liquid nitrogen was 10.467 nm,the samples treated with-80? were 8.322 nm,the samples treated with-20? were 5.131 nm,and the sample treated at-4?is only 4.962 nm.The BET specific surface area of the samples treated with liquid nitrogen was only 306.17 m2/g,and the samples were 406.37 m2/gat-20? and 397.21 m2/g at-4?.This aerogel was used for heavy metal ion adsorption.At the same time,the research on the process of nano-lignocellulosic aerogel adsorption of heavy metal ions from the optimization and reaction thermodynamics,reaction kinetics and other reaction mechanisms was investigated.The preparation and investigation of the adsorbent of Pinus massoniana bark were realized.The adsorption process conforms to Temkin(R2?0.9901)isothermal adsorption,and the result is shown as non-uniform adsorption and single-layer adsorption.Moreover,this process is a non-spontaneous composite adsorption process.In this paper,nano-lignocellulosic bio-adsorbent was prepared from Masson pine bark to complete the adsorption of heavy metal ions in wastewater,and a complete process to application process was realized.And for the first time,a solid acid was applied to Masson pine bark,and nano-lignocellulose was prepared.The Masson pine bark was effectively prepared into nano-lignocellulose,and the comprehensive utilization of the masson pine bark was realized.The prepared bioactive adsorbent of Pinus massoniana bark was subjected to adsorption experiments,and the analytical history and performance analysis of thermodynamics and kinetics were studied in detail.The operation feasibility,economic rationality and good industrial prospect of the method were established.