Physical adsorption is a common method to solve the contamination of methylene blue in dyeing wastewater.As a kind of adsorption material,cellulose aerogels with high porosity and surface areas have great potential ap...Physical adsorption is a common method to solve the contamination of methylene blue in dyeing wastewater.As a kind of adsorption material,cellulose aerogels with high porosity and surface areas have great potential application in methylene blue removal.However,the week hydrogen bonding between cellulose nanofibers making the cellulose aerogels with the poor mechanical properties and can be easily destroyed during adsorption.Hence,the preparation of cellulose aerogels with high mechanical strength is still a great challenge.Here,we report a robust super-assembly strategy to fabricate cellulose aerogels by combining cellulose nanofibers with PVA and M-K10.The resulting cellulose aerogels not only has a robust chemically cross-linked network,but also has strong H-bonds,which greatly enhance the mechanical properties.The resulting cellulose aerogels possess a low density of 19.32 mg/cm^(3).Furthermore,the cellulose aerogel shows 93%shape recovery under 60%strain(9.5 k Pa under 60%strain)after 100 cycles,showing excellent mechanical property.The adsorption capacity of cellulose aerogel to methylene blue solution of 20 mg/L is 2.28 mg/g and the adsorption kinetics and adsorption isotherms have also been studied.Pseudo-second-order kinetic model and Freundlich isotherm model are more acceptable for indicating the adsorption process of methylene blue on the cellulose aerogel.Thus,this compressible and durable cellulose aerogel is a very prospective material for dyeing wastewater cleanup.展开更多
基金supported by the National Key Research and Development Program of China(Nos.2019YFC1604601,2019YFC1604600,2017YFA0206901,2017YFA0206900,2018YFC1602301)the National Natural Science Foundation of China(Nos.21705027,21974029)+4 种基金the Natural Science Foundation of Shanghai(No.18ZR1404700)Construction Project of Shanghai Key Laboratory of Molecular Imaging(No.18DZ2260400)Shanghai Municipal Education Commission(Class II Plateau Disciplinary Construction Program of Medical Technology of SUMHS,2018-2020)National Natural Science Foundation of China Found(No.51703109)the Major Scientific and Technological Innovation Project of Shandong(No.2018CXGC1406)。
文摘Physical adsorption is a common method to solve the contamination of methylene blue in dyeing wastewater.As a kind of adsorption material,cellulose aerogels with high porosity and surface areas have great potential application in methylene blue removal.However,the week hydrogen bonding between cellulose nanofibers making the cellulose aerogels with the poor mechanical properties and can be easily destroyed during adsorption.Hence,the preparation of cellulose aerogels with high mechanical strength is still a great challenge.Here,we report a robust super-assembly strategy to fabricate cellulose aerogels by combining cellulose nanofibers with PVA and M-K10.The resulting cellulose aerogels not only has a robust chemically cross-linked network,but also has strong H-bonds,which greatly enhance the mechanical properties.The resulting cellulose aerogels possess a low density of 19.32 mg/cm^(3).Furthermore,the cellulose aerogel shows 93%shape recovery under 60%strain(9.5 k Pa under 60%strain)after 100 cycles,showing excellent mechanical property.The adsorption capacity of cellulose aerogel to methylene blue solution of 20 mg/L is 2.28 mg/g and the adsorption kinetics and adsorption isotherms have also been studied.Pseudo-second-order kinetic model and Freundlich isotherm model are more acceptable for indicating the adsorption process of methylene blue on the cellulose aerogel.Thus,this compressible and durable cellulose aerogel is a very prospective material for dyeing wastewater cleanup.
