In this study,based on curcumin(Cur)grafted carboxylated cellulose nanocrystal(CCNC)via EDC/NHS coupling method,CCNC-grafted curcumin(CCNC-Cur)sensor and CCNC-Cur compounded with sodium alginate(CCNC-Cur-SA)hydrogel adsorbents for the detection and removal of Pb2+were prepared.The results showed that the CCNC-Cur sensor had selective adsorption capacity for Pb2+,with Pb2+detection limit after digitizing the color depth of the sensor using Image J software of 6.25 mg/L.Under the optimized conditions of static adsorption experiment(adsorption time was 105 min,pH value was 5,adsorbent dosage was 0.08 g),the adsorption capacity towards Pb2+by CCNC-Cur-SA hydrogel reached 98.3 mg/g.
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