Lizhen Guo,Yuqi Wang,Meng Wang,Hiba Shaghaleh,Yousef Alhaj Hamoud,Xu Xu,He Liu
With the severe shortage of water resources and the low utilization efficiency of fertilizer, slow-release fertilizer equipped with water-absorbing and water-retaining capacity has captured much attention. Herein, by integrating metal-organic frameworks (MOFs) with cellulose nanofibres (CNFs) and sodium alginate (SA), a novel cellulose-based hydrogel (MIL-100(Fe)@CNF-SA) was fabricated that acted as a carrier for urea. The resultant hydrogel was not only qualified with a high surface area of 129.17 m 2 /g but also affluent in the hydrophilic groups . In parallel with the good water-holding capacity of 55% when the loading of the resultant hydrogel was only 0.5 g, the complete loss of the water in the treated soil was successfully slowed down by nearly 20 d compared with the soil without treatment. Urea (1.47 g/g) could be captured in the composite hydrogel , wherein the slow release of urea was achieved due to the synergism of the highly porous structure of the hydrogel and the crystals with a high specific surface area. Moreover, the positive effect of the resultant hydrogel on the growth of wheat was indexed to the germination rate, number of tillers, photosynthetic rate and chlorophyll content of the crop, which verified their further application in irrigating farming.
Cellulose nanofiber (CNF) film has been widely studied in recent years because of its high strength, high light transmittance, degradability, and low thermal expansion coefficient. However, challenges like shrinkage, long dehydration times, and poor water resistance limit its large-scale application. Herein, we report a facile and environmentally friendly method to prepare CNF/sodium alginate (SA) composite films. By adding a certain amount of SA in the CNF film and regulating the moisture in the film, the gap between CNF was filled and the dimensional stability of the film was improved. Meanwhile, the cross-linking property of SA significantly reduced the water absorption rate of the composite film, endowing the composite film with high strength (dry strength 125 MPa), high water resistance (wet strength 33 MPa), and high light transmittance (85–90%). Scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and X-ray diffraction (XRD) analyses confirmed the microstructure and interaction mechanism of CNF and SA in composite films. This method is not only simple to operate without using toxic or harmful reagents but also effective to inhibit the deformation during the drying process of CNF, which is expected to provide a feasible basis for the commercial application of CNF film.
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