Fig. 1. IR spectra of different samples

Fig. 2. XRD patterns: (a) NWF and NWF grafted with DMC and embedded nano-Al₂O₃ and nano-Al₂O₃; (b) different nano-Al₂O₃ content of NWF-g-DMC@Al₂O₃

Fig. 3. TG curves of different samples

Fig. 4. SEM of NWF grafted DMC and embedded nano-Al₂O₃:(a, d, g) NWF; (b, e, h) NWF-g-DMC; (c, f, i) NWF-g-DMC@nano-Al₂O₃

Fig. 5. Relationship between different influencing factors and weight gain rate: (a) relationship between monomer concentration and weight gain rate; (b) relationship between adsorbed dose and weight gain rate; (c) relationship between embedding content and weight gain rate

Fig. 6. Influence of different factors on adsorption rate: (a) relationship between monomer concentration, absorbed dose and adsorption rate; (b) relationship between the amount of nano-Al₂O₃ embedding and the adsorption rate; (c) relationship between pH and adsorption rate; (d) relationship between initial concentration and adsorption rate

Fig. 7. Relationship between the adsorption rate and time

Fig. 8. Diagram of possible adsorption and desorption mechanism of NWF-g-DMC@Al₂O₃ adsorbent