Design Of Cellulose-based Catalytic Material And Its Application In The Efficient Degradation Of Organophosphorus Pesticides In Water

Sustainable development,greening and ecologicalization are inevitable trends in the development of the chemical industry.With the depletion of non-renewable fossil resources and the increasing demand for green chemistry,society’s demand for renewable resources continues to grow.Renewable resources are biodegradable,environmentally friendly,renewable,etc.,have less risk to the health and safety of nature,animals and humans,and are considered to be the best alternative to fossil energy.Cellulose has rich reserves,a wide range of sources,high safety,non-toxic and biodegradable characteristics,giving it a wide range of applications.Organophosphorus pesticides are arguably the most important class of agrochemicals.After the extremely brilliant golden age of research,development,and application,they also faced many safety issues that are not compatible with humans and the environment.As some highly toxic organophosphorus pesticides are constrained by ecological and environmental protection in their development,they advocate environmental friendliness and the trend of green development.Therefore,organophosphorus pesticides are reasonably effective,simple and easy to operate without causing secondary pollution Comprehensive governance is an issue that needs urgent consideration in the fields of biology and chemical industry.(1)A large amount of lignocellulosic waste or by-products are produced every year through forestry and agricultural practices,paper industry,wood industry and many other agricultural industries.In order to make better use of these lignocellulose,they will be produced into cellulose nanofibers or whiskers To develop green nanocomposites.Cellulose nanowhiskers(CNC)were separated from rape stems with different concentrations of acid(45%,55%,and 65%H2SO4),and agar/CNC composite membrane was prepared to test its performance.(2)Under the Na OH/urea aqueous solution system,the cellulose is quickly dissolved to obtain a transparent cellulose solution,and the solution is used as a basic raw material,and the regenerated cellulose microspheres are prepared by a one-step drop method,and further by a solid phase modification method Introduce phosphoric acid groups onto the surface of cellulose microspheres to obtain phosphorylated cellulose microspheres adsorbent.Through the coordination of phosphate and Ag~+to obtain Ag~+-loaded phosphorylated cellulose microspheres adsorbent.As a microreactor,the sphere explored its catalytic degradation behavior for chlorpyrifos.Due to the electronic polarization of the surface complex of chlorpyrifos under certain conditions,the side chain attached to the pyridine ring may be weakened,and the P-O bond is broken,making the Ag~+-loaded phosphorylated cellulose microsphere catalyst highly efficient for degrading chlorpyrifos.This thesis set out to extract cellulose whiskers from cellulose and combine them with agar to develop a new type of natural polymer material.Through phosphorylation chemical modification of cellulose microspheres,the preparation of silver ion-loaded phosphorylated cellulose composite catalytic degradation agent is prepared.The catalyst can effectively degrade organophosphorus pesticides in water,and explore its application in the field of water pollution treatment.Application prospects.