The cellulose-based hydrogel has been widely applied for soil water retention and nutrient re-lease agents for several decades.Embedding the inorganic materials into hydrogels is an excellent strategy to improve the i...The cellulose-based hydrogel has been widely applied for soil water retention and nutrient re-lease agents for several decades.Embedding the inorganic materials into hydrogels is an excellent strategy to improve the inherent limits of the cellulose-based hydrogel.Notably,municipal sludge-derived hydrochar(HC)has reduced the environmental burden and offered a potential hydrogel carrier to control water-retention and nutrient-release.However,the above function for plant growth of hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid)(CMC-g-PAA/HC)is unknown,and relevant reports are lacking.This study investigated the water retention,nutri-ent release behavior,and effect of germination and plant growth of CMC-g-PAA/HC hydrogel.Characterization results showed that HC was successfully incorporated into CMC-g-PAA/HC with 6.0%higher thermostability,7.2-21.0%lower swelling ratio(SR)in water,and substantial SR in phosphate solution(P-solution).The water loss rate of CMC-g-PAA/HC in P-solution or wa-ter owned a more significant temperature response(7.9-15.0 folds)than CMC-g-PAA(8.2-10.0 folds).Moreover,4.0%higher n value and more 18.5%released P for CMC-g-PAA/HC were also observed.These phenomena were due to restricting the polymer chains movement and the wa-ter molecules diffusion inside the hydrogels with HC.Phytotoxicity assessments showed that HC in CMC-g-PAA/HC could effectively alleviate the inhibition effects on rape germination retained with 78.3%germination vigor and 80.0%germination ratio,even dramatically improved plant growth to 28 d.The results of this study demonstrated a new route for developing eco-friendly CMC-g-PAA/HC hydrogel,advantageous as a water retention agent and nutrient carrier in arid and semiarid regions.展开更多
基金This work was funded by the National Undergraduate Training Program for Innovation and Entrepreneurship(No.202010288024Z)National Natural Science Foundation of China(No.42107398)+1 种基金Natural Science Foundation of Jiangsu Province(BK20210358)China Postdoctoral Science Foundation(2020M68618).
文摘The cellulose-based hydrogel has been widely applied for soil water retention and nutrient re-lease agents for several decades.Embedding the inorganic materials into hydrogels is an excellent strategy to improve the inherent limits of the cellulose-based hydrogel.Notably,municipal sludge-derived hydrochar(HC)has reduced the environmental burden and offered a potential hydrogel carrier to control water-retention and nutrient-release.However,the above function for plant growth of hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid)(CMC-g-PAA/HC)is unknown,and relevant reports are lacking.This study investigated the water retention,nutri-ent release behavior,and effect of germination and plant growth of CMC-g-PAA/HC hydrogel.Characterization results showed that HC was successfully incorporated into CMC-g-PAA/HC with 6.0%higher thermostability,7.2-21.0%lower swelling ratio(SR)in water,and substantial SR in phosphate solution(P-solution).The water loss rate of CMC-g-PAA/HC in P-solution or wa-ter owned a more significant temperature response(7.9-15.0 folds)than CMC-g-PAA(8.2-10.0 folds).Moreover,4.0%higher n value and more 18.5%released P for CMC-g-PAA/HC were also observed.These phenomena were due to restricting the polymer chains movement and the wa-ter molecules diffusion inside the hydrogels with HC.Phytotoxicity assessments showed that HC in CMC-g-PAA/HC could effectively alleviate the inhibition effects on rape germination retained with 78.3%germination vigor and 80.0%germination ratio,even dramatically improved plant growth to 28 d.The results of this study demonstrated a new route for developing eco-friendly CMC-g-PAA/HC hydrogel,advantageous as a water retention agent and nutrient carrier in arid and semiarid regions.
