Preparation Of Seaweed Cellulose Aerogel And Its Application In Oil-water Separatio

As industrial modernization keeps moving forward,science and technology advance rapidly,and public awareness of environmental protection expands more and more nations are concentrating on environmental protection rather than advancing economic development by continuing to sacrifice the environment.The most serious and widespread of these is water resource contamination,which affects each aspect of human life.The issue of water pollution is exacerbated by the discharge of industrial wastewater,which is increasing day by day.Consequently,the current state of water resources is not encouraging.Effective treatment of industrial wastewater may assist by not simply ensuring that water resources are used wisely as well as by decreasing the problem of water pollution.Consequently,it is essential to eliminate organic and petroleum pollutants from industrial emissions.The adsorption method is suitable for the treatment of industrial organic wastewater,oil spill wastewater and petrochemical wastewater.Biomass is the most extensive renewable resource on Earth with excellent environmental compatibility.The adsorption of organic contaminants is made possible by regulating the interfacial properties of biomass materials.Seaweed is an abundant supply of marine biomass,and the natural cellulose can be extracted from it even after being used to produce a range of chemicals and nutritious foods.The purpose of this research is to create seaweed cellulose aerogel by extracting cellulose from seaweed waste.Aerogel preparation,which may be used for a variety of organic pollutants from water adsorption（dyes,organic solvents,oils,etc.）,possesses strong hydrophobicity and the absolute value of Zeta potential.（1）Through a series of acid-base and mechanical treatments,nano cellulose was successfully prepared,and its interface was regulated by amino group,carboxyl group and sulfonic acid group,respectively.Carboxyl functional groups were introduced by esterification of citric acid with hydroxyl group.Sulfonate group was introduced by the sulfonation of thiopyridine trioxide complex with hydroxyl group.Amino functional groups are introduced through the reaction between polyethylenimide and hydroxyl group.It is employed to adsorb 10 varied kinds of organic matter,and three different functional groups’adsorption capacities for various organic matter are investigated.The materials’structural traits and physicochemical traits were systematically characterized.It has been discovered that adding functional groups can considerably increase the adsorption capacity of cellulose,and that amino groups possess an adsorption capacity of more than 99%for the negative potentials of Congo red and tannic acid.To positive potential methylene blue and benzoic acid,the adsorption capacities of carboxyl and sulfonic groups increased to 47.8%and38.2%,respectively.（2）It is essential to address specific organic compounds in water-oil contamination.Polyethylenimine and diisocyanate were utilized as cross-linking and hydrophobic modifying agents to successfully synthesize the elastic aerogel of cellulose from alginate.The aerogel’s persistent elasticity（compressed 40 times）and robust hydrophobicity（above150°）were made conceivable by the preserved cellulose Iα,the three-dimensional sheet structure created by crosslinking(11～30 g·g^-1),and the addition of hydrophobic functional groups.