木纤维-壳聚糖全生物质泡沫制备及无土栽培应用性能OA

[Objective]This study aims to develop a cultivable foam made from renewable raw materials for use in soilless cultivation,thereby reducing reliance on conventional molding substrates such as rock wool and polyurethane.[Method]The soilless culture matrix foam material was prepared by mechanical foaming of wood residue fibers and chitosan gel.The effects of freeze-thaw treatment and Triton X-100(TX-100)on the macroscopic morphological characteristics and foam volume were investigated.The structure of foam was characterized by microscopic morphology and infrared spectrum,and the effects of citric acid as a cross-linking agent on the fundamental properties and cultivation performance of foam was evaluated through water retention p erformance,absorption tests,and cultivation experiments as well.[Result]The freeze-thaw treatment significantly improved the pore structure of the wood fiber-chitosan foam,with 1 g TX-100 as the optimal dosage.The addition of citric acid induced a cross-linked network within the chitosan,which could effectively enhance the pore structure and water retention capacity of the foam.Under the condition of 40℃for 12 hours,the wood fiber-chitosan foam had a water loss rate of only 69.21%and its water absorption capacity reached 68.15%,a significant improvement compared to the foam without citric acid.In the cultivation experiment,the growth performance of Raphanus sativus was second only to that grown in polyurethane foam cultivation substrates.[Conclusion]The combination of a freeze-thaw process and the use of TX-100 can create a uniform pore structure in the foam.The wood fiber-chitosan foam prepared with citric acid as the cross-linking agent can meet the basic requirements for plant growth,demonstrating good application potential in practical cultivation experiments.