Volume 7 Issue 2
May  2022
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Yufei Zhang, Xinyue Tian, Qiuyue Zhang, Huifang Xie, Bingyu Wang, Yanfang Feng. Hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid) hydrogel as stable soil water retention and nutrient release agent for plant growth[J]. Journal of Bioresources and Bioproducts, 2022, 7(2): 116-127. doi: 10.1016/j.jobab.2022.03.003
Citation: Yufei Zhang, Xinyue Tian, Qiuyue Zhang, Huifang Xie, Bingyu Wang, Yanfang Feng. Hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid) hydrogel as stable soil water retention and nutrient release agent for plant growth[J]. Journal of Bioresources and Bioproducts, 2022, 7(2): 116-127. doi: 10.1016/j.jobab.2022.03.003

Hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid) hydrogel as stable soil water retention and nutrient release agent for plant growth

doi: 10.1016/j.jobab.2022.03.003
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  • Corresponding author: E-mail addresses: huifangxie@njust.edu.cn (H. Xie); E-mail addresses: bingyuwang@njust.edu.cn (B. Wang)
  • Received Date: 2021-11-20
  • Accepted Date: 2022-01-27
  • Rev Recd Date: 2022-01-21
  • Available Online: 2022-05-06
  • Publish Date: 2022-05-01
  • 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.


  • 1These authors contributed equally to this work.
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