Preparation and Properties of Corn Stover Biochar Composite Hydrogel Materials
Biochar is widely utilized in agricultural soil for its high absorption properties,effectively mitigating plant drought stress.However,understanding the role of hydrogel-based biochar's efficacy in alleviating drought stress remains limited.Therefore,the current study aimed to explore water absorption and applications of biochar hydrogel from com straw,developing a graft copolymer with acrylic acid(AA)and acrylamide(AAM)to innovate plant stress mitigation strategies.Ammonium persulfate(APS)was used to activate the fine particles of biochar suspension,and N,N'-methylenebisacrylamide(MBA)served as the crosslinker to initiate free radical polymerization.This process randomly grafted poly(acrylic acid)(PAA)and polyacrylamide(PAAM)onto the biochar particles,producing five sets of biochar superabsorbent hydrogels.The results showed that all the five hydrogel formulations achieved a 24-h water absorption ratio exceeding 410 g/g,with the second set(BCHG-2)reaching up to 457 g/g.Fitting the data to the Langmuir equation predicted a maximum water absorption rate of 576.2 g/g for BCHG-2.The water absorption rates of BCHG-2 hydrogel in solutions of different pH values followed a Gaussian distribution model,peaking at pH=8.29.In 0.9％KC1,NaCl,and CaCl2 solutions,the water absorption rates were 68.10,65.54,and 30.42 g/g,respectively.Under drought stress conditions,adding BCHG-2 hydrogel could significantly enhanced the water retention capacity of loamy,sandy,and saline-alkaline soils.Furthermore,the growth of barley seedlings under drought conditions were significantly promoted by adding 1％,3％,and 5％BCHG-2 hydrogel.Overall,results of this study highlight the promising potential of biochar superabsorbent hydrogels as effective soil moisturizers,improving water retention and supporting plant growth in arid environments.
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